Liquiflo CENTRY 620 Series Installation, Operation & Maintenance Manual

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Liquiflo CENTRY 620 Series Installation, Operation & Maintenance Manual | Manualzz
TM
INSTALLATION, OPERATION
& MAINTENANCE MANUAL
CENTRY® SERIES
SEALED, CLOSE-COUPLED
CENTRIFUGAL PUMPS
Model 620 – Sealed
New Design:
Closed-Bracket with
Integral Seal Housing
& Type 21 or Type 9T
Single Mechanical Seal
Legacy Design:
Open-Bracket with
Single (Type 9A) or
Double Mechanical
Seal, or Packing
© Aug. 2021 Liquiflo, All rights reserved
443 North Avenue, Garwood, NJ 07027 USA
Document No.: 3.20.023
Tel: 908-518-0777
Fax: 908-518-1847
www.liquiflo.com
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Introduction
This manual provides instructions for the installation, operation and maintenance of the Centry ® Series
Centrifugal Pump, Model 620 – Sealed. It is critical for any user to read and understand the information
in this manual along with any documents this manual refers to prior to installation and start-up.
Liquiflo pumps shall not be liable for damage or delays caused by a failure to follow the instructions for
installation, operation and maintenance as outlined in this manual.
Thank you for purchasing a Liquiflo product.
LIQUIFLO STANDARD TERMS AND CONDITIONS APPLY UNLESS OTHERWISE SPECIFIED IN
WRITING BY LIQUIFLO.
Table of Contents
1. General Information
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
5. Maintenance & Repair
Pump Description . . . . . . . . . . . . . . . . . . . . . . . 3
General Instructions . . . . . . . . . . . . . . . . . . . . . 3
Pump Specifications . . . . . . . . . . . . . . . . . . . . . 4
Model Coding . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Operation . . . . . . . . . . . . . . . . . . . . . . . 6
Maintenance & Repair . . . . . . . . . . . . . . . . . . . . 6
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . 6
Returned Merchandise Authorization (RMA) . . . 7
5.1
5.2
5.3
2. Safety Precautions
2.1
General Precautions . . . . . . . . . . . . . . . . . . . . . 8
5.4
3. Pump & Motor Installation
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
Installation of Pump, Motor & Base . . . . . . . . . . 9
Power Frame Option . . . . . . . . . . . . . . . . . . . . . 9-10
General Piping Requirements . . . . . . . . . . . . . . 11
Strainers & Solids Handling . . . . . . . . . . . . . . . . 11
NPSH Requirement . . . . . . . . . . . . . . . . . . . . . . 12
Flow Requirements . . . . . . . . . . . . . . . . . . . . . . 12
Controlling the Flow . . . . . . . . . . . . . . . . . . . . . . 12
Affinity Laws . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Viscous Fluids . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Motor Selection . . . . . . . . . . . . . . . . . . . . . . . . . 13
Motor Shaft Direction . . . . . . . . . . . . . . . . . . . . . 13
4.1
4.2
4.3
Appendix:
A-1
A-2
A-3
A-4
A-5
4. Start-Up & Operation
Starting the Pump . . . . . . . . . . . . . . . . . . . . . . . 14
Packing & Double Seal Requirements . . . . . . . 15
Operation & Troubleshooting . . . . . . . . . . . . . . . 15
2
Work Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Removal from System . . . . . . . . . . . . . . . . . . . . 16
Pump Disassembly . . . . . . . . . . . . . . . . . . . . . . . 17-19
Removal of Impeller . . . . . . . . . . . . . . . . . . . . 17
Removal of Seals . . . . . . . . . . . . . . . . . . . . . . 18-19
A: Single Seal–Type 21 Removal . . . . . . . 18
B: Single Seal–Type 9T Removal . . . . . . . 18
C: Single Seal–Type 9A Removal . . . . . . . 18
D: Double Seal Removal . . . . . . . . . . . . . . 19
E: Packing Seal Removal . . . . . . . . . . . . . 19
Pump Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 20-32
Bracket Installation – Legacy Design . . . . . . . 20
Shaft Inspection & Polishing . . . . . . . . . . . . . 20
Installation of Seals . . . . . . . . . . . . . . . . . . . . 20-30
A: Single Seal–Type 21 Installation . . . . . 21-22
B: Single Seal–Type 9T Installation . . . . . 23-26
C: Single Seal–Type 9A Installation . . . . . 27-28
D: Double Seal Installation . . . . . . . . . . . . 29
E: Packing Seal Installation . . . . . . . . . . . 30
Installation of Impeller . . . . . . . . . . . . . . . . . . 31
Adjusting Impeller Clearance . . . . . . . . . . . . . 32
Volute-Bracket Assembly . . . . . . . . . . . . . . . . 32
Fastener Torque Specifications . . . . . . . . . . . . . 33
Maintenance Tool List . . . . . . . . . . . . . . . . . . . . 34
Pump Bill of Materials (BOM) . . . . . . . . . . . . . . 35-37
Reference Drawings . . . . . . . . . . . . . . . . . . . . . 38-53
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . 54-55
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Section 1: General Information
This manual covers the Centry® Series Sealed, Close-Coupled Centrifugal Pump, Model 620. (Note: Model 620
was formerly called Model 62.) The long-coupled mounting option using the Liquiflo Power Frame is also
covered in this manual.
1.1
Pump Description
Model 620 is an end-suction sealed centrifugal pump with the following features:

New design has closed-bracket with integral seal housing configurable with Type 21
or Type 9T single mechanical seal

Legacy design configurable with Type 9A single mechanical seal, Type 9T double
mechanical seal, or lantern ring/packing

Close-coupled or long-coupled mounting options

Choice of threaded or flanged ports

Back pullout design to simplify maintenance

Driver-supported shaft that simplifies pump design

Standard reduced impeller sizes to simplify pump selection
The pump Model Number and Serial Number are stamped on the Stainless Steel Tag that is attached to the
pump’s housing. The Serial Number is also permanently stamped on the pump’s volute.
The Model Number completely describes the pump’s construction and is required when ordering either a new
pump or replacement parts for an existing pump. The Model Number for the sealed pump is based on a 7position Model Coding system that is described in Section 1.4 (see page 5).
1.2
General Instructions
The materials of construction of the pump are selected based upon the chemical compatibility of the fluid being
pumped. The user must verify that the materials are suitable for the surrounding atmosphere.
If the fluid is non-conductive, methods are available to mechanically ground the isolated shaft. This is only
necessary if the surrounding atmosphere is extremely explosive or stray static charges are present.
Upon receipt of your Liquiflo pump:
1)
Inspect pump and verify that it was not damaged during transit.
2)
Inspect tag and verify that the Model Number of the pump matches the Model Number of the
pump that was ordered.
3)
Record the following information for future reference:
Model Number:
Serial Number:
Date Received:
Pump Location:
Pump Service:
3
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
1.3
Pump Specifications
Table 1: Dimensional Specifications
Specification
Type
Suction Size
Ports
Discharge Size
Diameter
Standard Trims
Impeller
Type
Mounting Bracket
Motor Frames (C-Face)
1
Value
Unit
Threaded (NPT) or Flanged (ANSI 150# RF)
1.00
0.75
3.75
3.50, 3.25, 3.00, 2.75
Open
Close-Coupled, Motor Supported 1
NEMA 56C thru 145TC 1
–
in
in
in
in
–
–
–
Foot-Mount Motor is required. Power Frame option is available for long-coupling pump mounting bracket to other
motor frames.
Table 2: Performance Specifications
Specification
Maximum Speed
Maximum Flow Rate
Maximum Differential Head
Table 3: Absolute Temperature & Pressure Ratings
Specification
Minimum Operating Temperature
Maximum Operating Temperature
Maximum Operating Pressure
2
Value
Unit
3600
45
65
RPM
GPM
ft
Value
Unit
°F
-40
500
300 2
°F
PSIG
For flanged pumps, max rating is 275 PSIG @ -20 to 100°F; for 100 to 500°F, derate by 0.263 PSI/°F.
Table 4: Weight Data
Single Mech. Seal
Item
Closed Bracket
Pump with Threaded Ports 3
Pump with Flanged Ports 3
Power Frame
3
12
16
Packing & Double
Mech. Seal
16
20
16
26
30
Unit
lb
lb
lb
Weight includes mounting bracket and excludes motor.
Table 5: Material Data
Components
Pump Body & Impeller
Shaft
Materials
Pump w/ Closed Bracket
Pump w/ Open Bracket
O-rings/Gaskets
Dynamic Seal
Single or Double
Mechanical Seal (Type)
Packing
Mounting Bracket
Mounting Hardware
Power Frame
4
5
Open Bracket
316 Stainless Steel or Alloy-C
316 SS (Not available in Alloy-C)
316 SS or Alloy-C 4 / 303 SS 5
Teflon, Viton or Graphoil
Seal Face: Single: Carbon or Teflon ; Double: Carbon
Seal Seat: Silicon Carbide
Seal Wedge: Teflon or Graphoil
Seal Body: Single, 21: 18-8 SS; Single, 9T: 316 SS;
Single, 9A: 316 SS or Alloy-C 4 ; Double, 9T: 316 SS
Packing Ring: Braided Teflon or Graphoil
Lantern Ring: Teflon
316 SS (Closed-design) or Cast Iron/Epoxy (Open-design)
18-8 Stainless Steel
Frame: Cast Iron/Epoxy; Shaft: Carbon Steel
Material will match Pump Body Material.
Part of pump shaft that attaches to motor shaft and does not contact pumped fluid.
4
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
1.4
Model Coding
Table 6: Model Coding for Centry® Model 620 - Sealed
Position
Description
1
Pump Model
2
Impeller Size
3
Basic Material of
Construction &
Port Type
4
Seal Configuration
5
Motor Frame
(or Power Frame)
6
O-Rings/Gaskets
7
Impeller Trim
(Standard)
1
2
3
4
5
6
7
Code
Selection
620
F
R
S
H
L
C
0
1
2
3
4
5
6
7
0
1
P
0
V
G
0
1
Model 620
Full-Size – 3.75” Diameter
Pos. 7 = 0
Reduced-Size
Pos. 7 = 1, 2, 3 or 4
316 SS Construction & NPT Ports
Alloy-C Construction & NPT Ports
316 SS Construction & Flanged Ports
Alloy-C Construction & Flanged Ports
Single Internal Mechanical – Carbon/SiC (Type 21) 1
Single Internal Mechanical – Carbon/SiC (Type 9T) 1
Single Internal Mechanical – Carbon/SiC (Type 9A) 2
Single Internal Mechanical – Teflon/SiC (Type 9A) 2
Double Mechanical – Carbon/SiC (Type 9T) 3
Lantern Ring – Teflon Packing 4
Single Internal Mechanical – Teflon/SiC (Type 9T) 1
Lantern Ring – Graphoil Packing 4
Close-Coupled – NEMA 56C 5
Close-Coupled – NEMA 143TC/145TC 5
Pedestal Mount – Power Frame 6
Teflon Housing Gasket 7
Viton O-Rings
Graphoil Housing Gasket 7
No Trim
Pos. 2 = F
3.50” Diameter
2
3.25” Diameter
3
3.00” Diameter
4
2.75” Diameter
Pos. 2 = R
Standard Single Mechanical Seal configuration for 316 SS pumps only. New design utilizes closed 316 SS
Mounting Bracket with integral Seal Housing.
Single Mechanical Seal configuration for Alloy-C pumps only. Legacy design utilizes open Cast Iron/EpoxyPainted Mounting Bracket with separate Seal Housing.
Double Mechanical Seal configuration for Legacy pumps only.
Lantern Ring/Packing configuration for Legacy pumps only.
Foot-Mount Motor is required. (See cover photos.)
Power Frame requires Long-Coupled configuration. (See diagram on page 10.)
Seal Seats for Type 21 or 9T Mechanical Seals use Viton O-rings; Seal Seat for Type 9A Single Mechanical Seal
uses Teflon O-ring; Seal Housing for Type 9A Single Mechanical Seal uses Viton O-ring.
Model Coding Example:
Position:
620FS0000
=
1
2
3
4
5
6
7
620
F
S
0
0
0
0
Model 620
Full-Size Impeller
316 SS Construction & NPT Ports
Single Internal Mech. Seal – Carbon/SiC (Type 21)
Close-Coupled – NEMA 56C Motor Frame
Teflon Housing Gasket
Impeller Trim – No Trim
5
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
1.5
General Operation
The successful and safe operation of a pump is not only dependent on the pump but also on each of the system
components. It is therefore important to monitor the entire pumping system during operation and to perform the
necessary maintenance to keep the system running smoothly.
A normally operating centrifugal pump will deliver a steady and pulse-less flow, be relatively quiet and have a
predictable flow rate and power requirement based on the impeller size, operating speed, differential head and
fluid specific gravity. Performance curves for centrifugal pumps are normally based on pumping water at room
temperature.
Centry Model 620 performance curves can be obtained from the Liquiflo website:
www.liquiflo.com. For viscous liquid applications, a performance correction is required (see Section 3.9).
Pumps operating with mechanical seals should have no leakage of the process fluid. Pumps operating with
packing should have a normal leak rate of 8 to 10 drops per minute with low viscosity liquids. Pumps operating
with a double mechanical seal must be supported with a pressurized fluid lubrication loop. For more information,
see Section 4.2.
If a significant problem is observed during operation, the pump should be stopped so that corrective action can
be taken. The observed problem could have several possible causes, and multiple remedies for each cause.
For help with problem solving, refer to the Troubleshooting Guide given in Appendix 5.
1.6
Maintenance & Repair
Pumps with packing require periodic lubrication or tightening of the gland screws over time. Pumps with a
double mechanical seal require maintenance of the fluid in the lubrication loop. Repair is necessary when the
gland screws cannot stop the packing from leaking excessively, or when the mechanical seal starts to leak, or
when a decrease in head is observed. O-rings and gaskets should always be replaced when rebuilding the
pump.
The main factors affecting the physical wear of the pump are operating speed, differential head, fluid viscosity,
duty cycle, starting and stopping frequency, abrasives in the fluid and the wear properties of the materials.
These factors can cause pump lifetimes to vary significantly from one application to another, making it difficult to
predict when the pump will require maintenance. Therefore, the maintenance schedule for the pump is typically
based on the maintenance history of the specific application. The main indicators that a pump may require
maintenance are the following: (1) decreased flow rate or head, (2) fluid leakage, (3) unusual noise or vibrations
and (4) increased power consumption.
The common repair items of the pump due to erosion wear are the seal components (i.e., packing rings, gland
plate or mechanical seal) and the shaft. Possibly, other pump parts, such as the impeller, volute and seal
housing, may require replacement due to abrasion wear, corrosion wear or cavitation wear.
Before performing maintenance on the pump, review the safety precautions and follow the included instructions.
1.7
Replacement Parts
Replacement parts for the pumps can be purchased from your local Liquiflo distributor. Refer to Appendices 3
& 4 for individual parts information.
6
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
1.8
Returned Merchandise Authorization (RMA)
If it is necessary to return the pump to the factory for service,
1)
Contact your local Liquiflo distributor to discuss the return, obtain a Returned Merchandise
Authorization Number (RMA #) and provide the distributor with the required information
(see RMA Record below).
2)
Clean and neutralize pump. Liquiflo is not equipped to handle dangerous fluids.
3)
Package the pump carefully and include the RMA # in a visible location on the outside surface of the
box.
4)
Ship pump to factory, freight prepaid.
Returned Merchandise Authorization (RMA) Record
1
RMA #
2
Distributor Name
3
Order Date
4
Customer PO #
5
Return Date
6
Item(s) Returned
7
Serial Number(s)
8
Reason for Return
9
Fluid(s) Pumped
10
Notes
(Supplied by Distributor)
NOTE: Pump must be cleaned and neutralized prior to shipment to the factory.
7
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Section 2: Safety Precautions
2.1
General Precautions

Always lock out the power to the pump driver when performing maintenance on the pump

Always lock out the suction and discharge valves when performing maintenance on the pump

Never operate the pump without safety devices installed

Never operate the pump with suction and/or discharge valves closed

Never operate the pump out of its design specifications

Never start the pump without making sure that the pump is primed

Never use heat to disassemble the pump

Inspect the entire system before start-up




Monitor the system during operation and perform maintenance periodically or as required by the
application
Decontaminate pump using procedures in accordance with federal, state, local and company
environmental regulations
Before performing maintenance on the pump, check with appropriate personnel to determine if
skin, eye or lung protection is required and how best to flush the pump
Pay special attention to all cautionary statements given in this manual.
Caution!
Failure to observe safety precautions can result in personal injury,
equipment damage or malfunction.
8
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Section 3: Pump & Motor Installation
3.1
Installation of Pump, Motor & Base
Refer to the Hydraulic Institute Standards for proper installation procedures of the base, pump and motor.
1)
The pump inlet should be as close to the liquid source as practical and preferably below it.
Centrifugal pumps cannot be used in a suction lift arrangement unless the pump is primed before
starting. Many issues can be avoided with a flooded suction arrangement.
2)
For Close-Coupled Centry pumps, no alignment procedure between the pump and motor is required.
3)
For Long-Coupled Pumps utilizing the Power Frame:
(a) The mechanical coupling between the motor and Power Frame has a flexible insert that
must be free to move axially – typically a distance of 1/16 to 1/8 inches – to prevent axial loads
from being transmitted to the power frame.
(b) The motor and Power Frame shafts must be manually aligned to eliminate radial loads on
the pump that will cause vibration and lead to premature pump failure. Alignment of longcoupled pumps is critical and should be checked by taking measurements of angularity and
parallelism at the coupling. If these are off by more than 0.015 inches (0.4 mm), the assembly
should be realigned. Flexible couplings are not intended to compensate for severe misalignment.
(NOTE: If the pump was delivered as a complete long-coupled assembly, it was properly aligned at
the factory.)
(c) Install the coupling guard over the mechanical coupling and fasten to the base plate.
(NOTE: If the pump was delivered as a complete long-coupled assembly, the coupling guard was
properly installed at the factory.)
Caution!
After performing alignment procedure, ensure that the Coupling Guard is replaced
before operating pump. Do not wear loose clothing around rotating objects.
NOTE: See pages 48-53 for diagrams of pump mounting options and Section 3.2 for more information about
the power frame.
3.2
Power Frame Option
If the Model Number of the pump contains the letter “P”, the pump was ordered with the Liquiflo Power Frame
option. The power frame is a pedestal that supports the pump and allows it to be long-coupled to a motor. The
power frame has the following uses and advantages:
1)
The power frame allows motor frames that are not compatible with the pump mounting bracket to
be coupled to the pump. (For example, motor frames larger than NEMA 145TC, IEC motors or
frames without a C-face can be used.)
2)
The power frame enables the motor to be isolated from the pump simply by removing the flexible
coupling. (This is convenient for removing or replacing the motor, or when performing
maintenance.)
3)
The power frame thermally isolates the pump from the motor. (The power frame has an integral
cooling jacket that keeps the pedestal’s bearing system cool even when the pump is operating at
maximum temperature.)
The power frame is shown in detail on page 10. The key components of the power frame are described below:
Bearings: The power frame shaft is supported by ball bearings on opposite ends of the pedestal. The oil
reservoir is used to lubricate the bearings. This reservoir is accessible by removing the two 1/8” NPT plugs on
the end of the casing.
9
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Cooling Jacket: The pedestal’s integral cooling jacket is used to keep the bearing system cool when the pump
is operating at elevated temperatures. This is accomplished by circulating a heat transfer fluid thru the jacket.
The cooling loop must be connected to the 1/8” NPT ports on the top and bottom of the casing. (Note: The ports
come with red plastic plugs installed. These plugs should not be removed unless a cooling loop is used.)
Shaft: The motor end (or driven end) of the shaft has a 3/4” diameter. The pump end (or driver end) has a 5/8”
diameter. (Note: Additional dimensional data for the power frame are given on pages 49 and 52-53.)
Power Frame Cross-Sectional View:
OIL FILL PLUG
PLUG
OIL DRAIN PLUG
PLUG
A typical long-coupled mounting of the pump and motor, using the power frame option, is shown below:
Long-Coupled Mounting with NEMA 56 thru 145T or NEMA 56C thru 145TC Motor Frames
Power Frame Maintenance:
The power frame is delivered from the factory with its oil reservoir empty. Before operating the power frame, fill the
reservoir with 4 fluid ounces of #20 wt., non-detergent type oil.
The oil in the reservoir should be replaced periodically, with use. To replace the oil: (1) Remove the fill and drain
plugs and collect the used oil in a container, (2) Replace the drain plug, (3) Fill the reservoir with 4 fluid ounces of
clean oil, and (4) Replace the fill plug. (For more information, see the Liquiflo website for the power frame service
manual.)
Caution!
Do not operate the Power Frame without oil in the reservoir. Before performing maintenance, ensure
that the power to the motor is turned OFF and locked out. Do not overfill the reservoir.
10
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
3.3
General Piping Requirements
Refer to the Hydraulic Institute Standards for piping guidelines.
1)
All piping must be supported independently and must line up naturally with pump ports.
2)
Piping that handles both hot and cold liquids require proper installation of expansion loops and joints so
that thermal expansion of the piping will not cause misalignment.
3)
The piping should be arranged to allow the pump to be flushed and drained prior to the removal of the
pump for servicing. Valves and unions should be installed to allow the pump to be isolated during
maintenance. Valves which open to the full pipe diameter, such as ball valves, should be used.
4)
Suction and discharge piping should be the same size or larger than the inlet and outlet ports.
This is especially important for viscous services when the pipe diameter has a large effect on friction
losses and NPSH available.
5)
Suction piping should be designed to minimize friction losses. The length of the suction line
should be as short as possible with no sharp turns or bends. Any elbows used should be long radius.
There should be a minimum of five pipe diameters of straight pipe between the elbow and the suction
inlet. Reducers, if used, should be eccentric at the pump suction port.
6)
The suction pipe must be submerged sufficiently below the liquid surface to prevent vortices and air
entrapment at the supply.
7)
Suction Head (Flooded Suction) Arrangement: Piping should be level or slope gradually downward
from the supply source to eliminate air pockets.
8)
Suction Lift Arrangement: The suction pipe must slope continuously upward towards pump suction to
eliminate air pockets. All connections must be air tight. A means of priming the pump must be
provided.
9)
Gasket materials used with flanged connections must be compatible with the fluid and operating
temperature.
10)
The piping system should be cleaned prior to installation of the pump.
3.4
Strainers & Solids Handling
1)
Centry sealed pumps rely on the motor bearings and therefore can tolerate larger particle sizes (up to
0.016 inches or 400 microns) compared with mag-drive pumps that use internal sleeve bearings. If
small abrasive particles are present, they can accelerate wear of internal components and surfaces
over an extended period of time. Although some solids can be tolerated, pumping abrasive particles
is not suggested with these pumps.
2)
Regardless of particle size, these pumps are intended for relatively clean liquids where the
general concentration of solids is limited to 2% by volume. Higher concentration may cause the wear
rate to increase, resulting in a decrease in pump performance. In addition to solids concentration, the
specific wear rate also depends on the size, shape and hardness of the particles, the operating speed
and the materials used to construct the pump. Since wear rate is proportional to the square of the
speed, slower operating speeds will substantially increase pump life.
3)
While occasional small particles may not be catastrophic to the pump, the use of a strainer on the
inlet will prevent large particulates from entering the pump. If the strainer clogs with material and
is not properly maintained, the pump may be starved of liquid, causing a loss of flow and damaging the
pump via dry-running. When a suction strainer is used, it should have a net open area of at least three
times the suction pipe area.
11
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
3.5
NPSH Requirement
All pumps require sufficient NPSH (Net Positive Suction Head) to function properly. The NPSH available in the
system is the difference between the available suction pressure at the pump inlet and the vapor pressure of the
fluid (which depends on the fluid temperature). The NPSH required by the pump is a function of pump speed
and impeller diameter, and is included with the Performance Curves of the pump. NPSH values are typically
given in units of ft H2O (a) (feet of water, absolute) or m H2O (a) (meters of water, absolute).
The NPSH available in the system must be greater than the NPSH required by the pump or the pump will
go into cavitation, resulting in decreased flow, increased noise emission and potential damage to internal
components.
3.6
Flow Requirements
The pump must be operated with a minimum flow rate to prevent overheating of the process fluid. A
generally accepted industry practice for minimum flow rate is 15% of the flow rate at the Best Efficiency Point
(BEP). Alternatively, the minimum flow rate can be calculated based on the service conditions, power dissipation
and the allowable temperature rise of the fluid. Consult the Hydraulic Institute Handbook or Liquiflo Engineering.
Operating the pump at over 90% of the flow rate at runout should be avoided to prevent a system
fluctuation from causing the pump to “run off the curve,” which can increase the NPSH required by the pump,
possibly going above the NPSH available in the system and causing cavitation.
3.7
Controlling the Flow
A centrifugal pump is a kinetic type pump, and flow is typically controlled by throttling the discharge valve.
The operating point for a centrifugal pump is the intersection of its Head vs. Flow Performance Curve (for a
specific impeller diameter) and the System Resistance Curve (which is a function of the flow rate). Increasing
the flow area of the valve reduces the system resistance and causes the flow rate to increase (i.e., further
opening of the valve moves the operating point to the right on the performance curve). Conversely, decreasing
the flow area of the valve increases the system resistance and causes the flow rate to decrease (i.e., further
closing of the valve moves the operating point to the left on the performance curve).
3.8
Affinity Laws
The performance of a centrifugal pump at any operating speed and impeller diameter can be closely
approximated from the performance at a standard motor speed and impeller diameter by using the Affinity Laws:
Affinity Laws for Centrifugal Pumps
Where, Q = Flow Rate, H = Head, P = Power, n = Speed and D = Impeller Diameter.
3.9
Viscous Fluids
Centry sub-ANSI pumps are generally applied at viscosities under 200 centipoise (cP). For fluid viscosities over
2 cP, a Viscosity Correction per Standard ANSI/HI 9.6.7 is required to size the pump and motor. For sizing
of viscous fluid applications or for more assistance in general selection, contact the local distributor or Liquiflo
Engineering.
12
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
3.10
Motor Selection
1)
For the Close-Coupled configuration, the motor frame size is part of the pump model coding and is
selected at the time the pump is ordered. The motor frame must have a C-face for compatibility with the
pump mounting bracket. Refer to Position 5 of the pump model code (see Table 6 on page 5).
2)
For the Long-Coupled configuration, the motor is mechanically-coupled to the Power Frame ancillary
device. In this case, any suitable motor frame can be used.
3)
For all configurations of the pump, a Foot-Mount motor is required for mounting to a base (see cover
photos and diagram on page 10).
4)
The motor must have an enclosure that is compatible with the application conditions. If an explosionproof motor is required, the temperature code of the motor must be acceptable for the process fluid.
5)
The motor speed and power rating are usually determined at the time the pump is ordered to meet the
specified conditions of service. For thin liquids, the Head vs. Flow Performance Curves can be used
directly to determine the speed and brake horsepower (BHP) requirements, as well as the required
impeller diameter. For liquids heavier than water, the BHP obtained from the Performance Curves
must be multiplied by the Specific Gravity of the liquid to determine the BHP required. For viscous
fluids, a viscosity correction is required (see Section 3.9). Additional power is required to overcome
the friction losses due to viscosity.
3.11
Motor Shaft Direction
The motor shaft must turn in the direction required by the centrifugal pump. Looking at the pump end, the motor
shaft must rotate counter-clockwise, as shown below.
Counter-clockwise
rotation of motor
shaft & impeller
13
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Section 4: Start-Up & Operation
4.1
Starting the Pump
Before operating the pump, inspect the hydraulic system and verify the following:
1)
Pump Construction: The materials of construction of the pump must be compatible with the process
fluid.
2)
Pump Mounting: The pump must be securely fastened to the base and ground using the basic
installation procedures as outlined by the Hydraulic Institute.
3)
Alignment: Pumps that are close-coupled to a motor do not require manual alignment. Those that are
long-coupled to a motor, using the power frame option, will require alignment of the motor and power
frame shafts (see Section 3.1).
4)
Piping Layout: Process piping procedures are extremely important and must be performed in
accordance with the Hydraulic Institute. As a minimum, inlet piping must be equal to or larger in
diameter than the pump inlet size. Twists and bends of pump inlet piping should be kept to an absolute
minimum. Ensure that adequate NPSH is available for the pump to operate properly.
5)
Motor Enclosure: The motor enclosure must be suitable for the conditions of service.
6)
Electrical Hook-up: The electrical connections to the motor should be performed by a qualified
electrician. It is critical that the supply voltage match the motor nameplate voltage or serious motor
damage or fire can result.
6)
Safety: Never operate a long-coupled pump without the coupling guard installed. A power sensor
should be installed to stop the motor in the event of a loss-of-load or overload condition.
Caution!
Do not wear loose clothing around rotating objects.
8)
Pumps with Packing or Double Mechanical Seal: These seal types have special requirements (refer
to the information in Section 4.2).
9)
Valves: Open all suction and discharge valves before operating the pump or damage or malfunction
may result. (Note: Suction valves must be open to supply the pump with fluid and a method of priming
the pump must be available to prevent dry-running. Fully closing a discharge valve when the pump is
operating will cause circulation of fluid inside the pump’s volute. Operating the pump continuously in
this state will cause significant heating of the fluid.)
10)
Priming & Direction of Rotation: Prime the pump and then briefly jog the motor to assure proper
motor direction. Motor shaft direction must be counter-clockwise, as seen from the pump end (see
page 13). Remove the vent plug located at the top of the volute to purge any air trapped in the pump
(see diagram on page 16 for location of volute plugs).
Caution!
Always prime pump before operating. Do not run the pump dry for more
than a few seconds or damage to the seal will result. Extended dry running
can damage other internal parts.
14
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
4.2
Packing & Double Seal Requirements
4.2.1
Packing Seal
1)
Packed pumps require some type of lubrication around the pump shaft or the packing
will overheat and score the shaft. This can be achieved with grease, an external flush or
nothing at all. If grease is used, it should be compatible with the process fluid (i.e., non-soluble
and non-reactive). Inject grease into the top fitting after removing the drain plug on the
opposite side of the seal housing. This greasing should be repeated periodically. (Note:
Replace drain plug after greasing.) If nothing is used, there must be some leakage out of the
pump so the packing is well lubricated by the pumpage. (This is typically accomplished with
liquids of relatively low viscosity.)
2)
The packing compression must be adjusted during pump operation. Do not over-tighten the
packing gland screws. This will burn the packing and damage the shaft. Packed boxes
should leak at the rate of approximately 8 to 10 drops per minute. Tighten the gland screws
1/4 turn at a time and allow the leakage rate to stabilize. Repeat until a rate of about 8 to 10
drops per minute is stable.
Caution!
Do not over-tighten the packing gland screws.
Damage to the packing and shaft will result.
4.2.2
Double Mechanical Seal
For pumps equipped with a double mechanical seal, a fluid lubrication loop, to pressurize the
seal chamber, is required. The seal chamber should be kept at approximately 5 to 20 PSI
higher than the discharge pressure. In addition, the flow rate through the seal chamber should
be approximately 1/8 GPM. This is required to cool and flush the seal faces. For fluids with
specific heat values other than 1.0 (i.e., water) the flow rate should be adjusted.
Caution!
Failure to properly support the Double Mechanical Seal when operating
the pump will cause premature seal wear and leakage.
4.3
Operation & Troubleshooting
Before starting the pump, review the steps in Section 4.1. If the pump has packing or a double mechanical seal,
the seal must be supported as explained in Section 4.2 above.
A normally operating centrifugal pump will deliver a steady and pulse-less flow, be relatively quiet and have a
predictable flow rate based on the impeller size, operating speed and differential head across the pump. Refer to
the performance curves for Centry Model 620, which are available on the Liquiflo website. (Note: If the fluid
viscosity is significantly higher than the viscosity of water, a performance correction is required as explained in
Section 3.9.)
The differential pressure can be measured with calibrated pressure gauges close to the suction and discharge
ports. (Note: The true differential pressure must take into account the difference in gauge elevations and the
velocity head (dynamic pressure) differential resulting from the increase in fluid velocity thru the centrifugal pump.
Pressure is related to Head by the following formula: Pressure [PSI] = (Head [feet] x SG)/2.31, where SG is the
Specific Gravity of the fluid.) The flow rate can be measured with a calibrated flowmeter in the discharge line.
After priming and start-up, monitor the pump for several minutes to ensure proper operation. If excessive noise
is heard, or product leakage is observed, or performance is not as expected, stop the pump and refer to
Appendix 5 for troubleshooting.
15
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Section 5: Maintenance & Repair
The major maintenance items for the sealed pump are tightening of the gland screws for packed pumps and
periodic lubrication of the packing (if grease is being used), and maintenance of the barrier fluid in the double
mechanical seal loop. When the gland screws cannot stop the packing from leaking excessively, or the
mechanical seal starts to leak, or a decrease in head is observed, repair is necessary. O-rings and gaskets
should always be replaced when rebuilding the pump.
5.1
Work Safety
Before performing maintenance, review the safety precautions given in Section 2 (see page 8).
5.2
Removal from System
Before servicing, prepare the pump as follows:
Caution!
If the pump was used with hazardous or toxic fluids, it must be flushed and decontaminated
prior to removal from the system piping. Refer to the Material Safety Data Sheet (MSDS)
for the liquid and follow all prescribed safety precautions and disposal procedures.
1
Flush the pump.
2
Stop the motor and lock out the electrical panel.
3
Close the suction and discharge isolation valves.
4
Disconnect the pump from the system piping.
NOTE: The pump has a back pullout design. This feature makes it unnecessary to disconnect the volute from the
system piping. The pump can be drained of residual liquid by removing the 1/8” NPT plugs from the volute (see
diagram below) and the seal housing, when applicable (see drawings in Appendix 4).
Location of Vent & Drain Plugs:
The pump has two 1/8” NPT plugs
located on the top and bottom of the
volute. Another 1/8” NPT port and
plug may be present on the pump’s
outlet port (see diagram at right).
16
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
5.3
PUMP DISASSEMBLY
Follow the procedure below and refer to the Sectional and Exploded View drawings in Appendix 4. Drawing
reference numbers are given in parentheses in the following procedure.
Caution!
Be certain that the power to the motor is turned OFF and locked out.
1
A.
Pump with Closed-Bracket Design: Remove the four sets of volute mounting bolts (6); then
separate the volute (2) from the assembly.
B.
Pump with Open-Bracket Design: Remove the four sets of volute mounting bolts (6), nuts (7)
and lock washers (8); then separate the volute (2) from the assembly.
NOTE: The pump has a back pullout design. This feature makes it unnecessary to disconnect the volute
from the system piping.
2
Remove the housing O-ring or gasket (5) and discard.
3
Removal of Impeller:
A.
Pump with Type 21 or 9T Single Mechanical Seal, Double Mechanical Seal or Packing:
Loosen the impeller setscrew (9) and then remove the impeller (1) from the pump shaft (4).
B.
Pump with Type 9A Single Internal Mechanical Seal: Remove the impeller screw (9) and then
remove the impeller (1) and lock collar (10) from the pump shaft (4).
NOTE: Removal of the impeller screw is facilitated by using a second wrench on the flats of the pump shaft.
4
Pump with Open-Bracket Design Only: Loosen the two setscrews (11) that secure the pump shaft
(4) to the driver shaft.
NOTE: The driver shaft can be the motor shaft or the power frame shaft .
5
A.
Pump with Closed-Bracket Design: Remove the bracket mounting bolts (15) and lock washers
(16) and then separate the bracket (14), which contains the seal components, from the motor.
Then loosen the two setscrews (11) and remove the pump shaft (4) from the motor shaft.
B.
Pump with Open-Bracket Design: Remove the seal housing (3), which contains the seal and
shaft, as a complete assembly.
Pump with Open-Bracket Design
Pump with Closed-Bracket Design
17
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Removal of Seals:
6
The pump can have any one of five different types of seals installed. Refer to the applicable section
below for removal of the pump’s seal:
Reference Drawings
Exploded
Sectional
View
Section
Seal Removal
Mech.
Seal
Type
Pos.
4
Code
Page
#
A
Single Internal Mech. Seal
21
0
18
#1
#1 / #1A
38-39
B
Single Internal Mech. Seal
9T
1, 6
18
#2 / #2A
#2
40-41
C
Single Internal Mech. Seal
9A
2, 3
18
#3
#3
42-43
D
Double Mechanical Seal
9T
4
19
#4
#4
44-45
E
Packing Seal
---
5, 7
19
#5
#5
46-47
A.
B.
C.
Page
#s
Single Internal Mech. Seal, Type 21 Removal (Refer to Drawings on Pages 38-39)
A1
Remove the unattached Type 21 single mechanical seal components (17 & 20) from the
seal housing section of the mounting bracket (14). These components are the sealing
ring, holder assembly (consisting of the drive band, retainer and flexible bellows), spring
and spring support washer.
A2
Press out the seal seat (18) from the Seal Housing. Discard the seal seat O-ring (19).
Single Internal Mech. Seal, Type 9T Removal (Refer to Drawings on Pages 40-41)
B1
Remove the unattached Type 9T single mechanical seal (17) from the seal housing
section of the mounting bracket (14).
B2
Press out the seal seat (18) from the Seal Housing. Discard the seal seat O-ring (19).
Single Internal Mech. Seal, Type 9A Removal (Refer to Drawings on Pages 42-43)
C1
Remove the seal seat (18) and seal seat
O-ring (19) from the shaft (4). Dispose of
the seal seat O-ring.
C2
Remove the shaft (4) and wiper (12) from
the seal housing (3)
C3
Remove the Type 9A mechanical seal (17)
by pressing it out of the seal housing (3).
18
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
D.
Double Mechanical Seal, Type 9T Removal (Refer to Drawings on Pages 44-45)
D1
Remove the two gland screws (20).
D2
Withdraw the shaft assembly, which consists of the shaft (4), mechanical seal (17),
outer seal seat (22) and gland plate (12), from the seal housing (3).
Caution!
Do not remove the Mechanical Seal from the shaft unless a new
replacement seal is available; the Seal Wedges will be damaged
upon removal.
E.
D3
Loosen all setscrews on the metallic body of the mechanical seal (17); then slide the
seal off the shaft (4).
D4
Remove the outer seal seat (22) from the shaft (4) and dispose of the O-ring (23).
D5
Remove the gland plate (12) from the shaft (4).
D6
Remove the inner seal seat (18) by pressing it out of the seal housing (3).
D7
Remove the O-ring (19) from the inner seal seat (18) and dispose of the O-ring.
Packing Seal Removal (Refer to Drawings on Pages 46-47)
E1
Remove the split gland (12) by removing the two gland screws (20).
E2
Remove the shaft (4) from the seal housing (3).
E3
Remove old packing rings (17) and lantern ring (18) from the seal housing (3).
NOTE: The use of a packing puller or hooked tool will facilitate removal of the packing and
lantern ring.
END OF DISASSEMBLY PROCEDURE
19
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
5.4
PUMP ASSEMBLY
Follow the procedure below and refer to the Sectional and Exploded View drawings in Appendix 4. Drawing
reference numbers are given in parentheses in the following procedure.
Caution!
Be certain that the power to the motor is turned OFF and locked out.
Bracket Installation – Legacy Design:
NOTE: Step 1 applies only to pumps with Type 9A Single Mechanical Seal, Double Mechanical Seal or
Packing. If the blue-painted pump mounting bracket is already installed, or for Type 21 and Type 9T Single
Mechanical Seals, start with Step 2.
1
Install the mounting bracket (14) to the motor or power frame using four sets of bolts (15) and
lockwashers (16).
NOTE: For pumps with a Packing Seal or Double Mechanical Seal, a spacer plate (10) and longer mounting
bolts (15) are required. Refer to Appendix 1 for the lengths and torque specifications of the bolts.
Shaft Inspection & Polishing:
2
Inspect the pump shaft (4) and verify that it has not been scored or worn from prior use.
Caution!
If the shaft exhibits excessive wear, it must be replaced.
3
Remove any burrs or scratches on shaft (4), by polishing, prior to reassembling pump.
Caution!
This step is important to ensure the proper fit of parts and
to prevent scoring of the seal on reassembly.
Installation of Seals:
4
The pump can have any one of five different types of seals. Refer to the applicable section below for
installation of the pump’s seal:
Reference Drawings
Exploded
Sectional
View
Section
Seal Installation
Mech.
Seal
Type
Pos.
4
Code
Page
#s
A
Single Internal Mech. Seal
21
0
21-22
#1
#1 / #1A
38-39
B
Single Internal Mech. Seal
9T
1, 6
23-26
#2 / #2A
#2
40-41
C
Single Internal Mech. Seal
9A
2, 3
27-28
#3
#3
42-43
D
Double Mechanical Seal
9T
4
29
#4
#4
44-45
E
Packing Seal
---
5, 7
30
#5
#5
46-47
20
Page
#s
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
A.
Single Internal Mech. Seal, Type 21 Installation (Refer to Drawings on Pages 38-39)
A1
Install the pump shaft (4) onto the driver
shaft but do not fully tighten the setscrews
(11).
A2
Install the seal seat O-ring (19) into the
seal seat (18).
NOTE: To facilitate installation of the seal seat,
lubricate the outside surface of the O-ring with a
lubricant that is compatible with the process
fluid.
Caution!
Do not reuse O-rings.
A3
Install the seal seat (with O-ring) into the
Seal Housing of the bracket (14).
Caution!
Do not handle or scratch
the lapped surface of the
seal seat. Install the seal
seat so that the lapped
surface is facing outwards.
A4
Carefully install the mounting bracket (14)
to the driver C-face using four sets of bolts
(15) and lock washers (16).
A5
Install the Seal Holder Assembly of the
Type 21 Single Mechanical Seal on the
shaft with the working face of the seal
facing towards the seal seat (see detailed
seal drawing #1A on page 39).
Caution!
Do not handle or scratch
the lapped face of the seal.
21
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
A6
Install the spring and spring support
washer (20) on the shaft.
A7
Place the impeller (1) on the end of
the pump shaft (4) and align the
setscrew bores; then attach the
impeller to the shaft by tightening the
impeller setscrew (9).
A8
Impeller Clearance: A gap of .016”
(16 mils) between the impeller and
bracket will center the impeller and
set the compression of the single
mechanical seal.
IMPELLER
SETSCREW
SET GAP
TO .016”
Positioning the Impeller: Loosen the
shaft setscrews (11) and position the
impeller-shaft assembly on the driver
shaft to attain the proper clearance;
then tighten the two setscrews to lock
the assembly in place.
PUSH
NOTE: Shims can be used to position the
impeller to the specified clearance. Tighten
the dog-point setscrews (11) into the
keyway of the driver shaft.
A9
Turn the impeller (1) by hand to ensure that it rotates freely.
NOTE: The impeller should not rub against the bracket but some drag from the seal will be felt.
A10
A11
Place the volute O-ring or gasket (5) in position on the bracket (14).
CAUTION: Do not reuse O-rings or gaskets.
Install the volute (2) to the bracket
(14) using four sets of bolts (6) and
lock washers (8).
NOTE: Apply anti-seize compound to
the bolts. Refer to Appendix 1 for the
torque specifications of the fasteners.
When tightening the bolts, use a star
pattern torque sequence on the
fasteners to ensure even compression
on the O-ring’s surface. With Teflon
(PTFE) O-rings, repeat this process
several times, waiting between
retightening. This is necessary because
Teflon will cold flow and require a certain
amount of time to properly seat.
Continue the process until the bolts no
longer require retightening.
END OF ASSEMBLY PROCEDURE
22
VOLUTE
O-RING
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
B.
Single Internal Mech. Seal, Type 9T Installation (Refer to Drawings on Pages 40-41)
B1
Place the pump shaft (4) onto the driver
shaft with the setscrews (11) aligned with
the keyway of the driver shaft, but do not
tighten the setscrews.
B2
Install the seal seat O-ring (19) into the seal seat (18).
Caution!
Do not reuse O-rings.
B3
Install the seal seat (with O-ring) into the Seal Housing of the bracket (14).
Caution!
Do not handle or scratch the lapped surface of the seal seat. Install the seal
seat so that the lapped surface is facing outwards.
NOTE: To facilitate installation of the seal seat, lubricate the outside surface of the O-ring with a
lubricant that is compatible with the process fluid.
B4
Carefully install the mounting bracket (14) to the driver C-face using four sets of bolts
(15) and lock washers (16).
B5
Pull the shaft out and tighten one setscrew to prevent the shaft from moving axially.
PULL
23
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Mechanical Seal Installation:
B6
Remove the four screws on the metal body of the Type 9T single mechanical seal,
which are not used.
Caution!
Do not handle or scratch the lapped face of the seal. Do not remove the
retaining clips from the seal until after the seal is placed on the shaft.
NOTE: A new Type 9T single mechanical seal comes with four retaining clips installed on
the seal body. The retaining clips compress the seal springs, eliminating spring pressure
on the seal’s wedge. Once the retaining clips are removed, the spring pressure will cause
the wedge to seal against the shaft.
B7
Place the mechanical seal at least halfway on the end of the shaft so that the seal
wedge is over the shaft (refer to the detailed drawing below for seal orientation).
B8
Using a small flat screwdriver, carefully remove all retaining clips from the seal.
B9
Position the seal on the shaft so that the end of the seal body is even with the front of
the step of the shaft (as shown in the drawing below).
B10
Using an Allen wrench in one setscrew to prevent the shaft from rotating, orient the
seal radially so that the pin hole in the seal body is about 90° from the setscrew
bore in the step of the shaft.
B11
While continuing to hold the shaft in position with the Allen wrench, install the impeller
so that the impeller setscrew is aligned with the setscrew bore in the step of the
shaft and then adjust the seal position so that the drive pin in the impeller engages
into the pin hole in the seal body.
Type 9T Single Mechanical Seal Installation
24
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
B12
Tighten the impeller setscrew (9) to attach the impeller to the shaft.
IMPELLER
SETSCREW
B13
Impeller Clearance: A gap of .016 +/- .002 in. (14 to 18 mils) between the rear of
the impeller and the face of the bracket will center the impeller inside the pump
housing and set the compression of the single mechanical seal.
Positioning the Impeller: Loosen the shaft setscrews (11) and position the
impeller-shaft assembly on the driver shaft to attain the proper clearance; then
tighten the two setscrews to lock the assembly in place.
NOTE: Shims can be used to position the impeller to the specified clearance. Tighten the dogpoint setscrews (11) into the keyway of the driver shaft.
SET GAP TO
.014” to .018”
PUSH
B14
Turn the impeller (1) by hand to ensure that it rotates freely.
NOTE: The impeller should not rub against the bracket but some drag from the seal will be felt.
25
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
B15
Place the volute O-ring or gasket (5) in position on the bracket (14).
Caution!
Do not reuse O-rings or gaskets.
B16
Install the volute (2) to the bracket (14) using four sets of bolts (6) and lock washers
(8).
VOLUTE
O-RING
NOTE: Apply anti-seize compound to the bolts. Refer to Appendix 1 for the torque specifications
of the fasteners. When tightening the bolts, use a star pattern torque sequence on the fasteners to
ensure even compression on the O-ring’s surface. With Teflon (PTFE) O-rings, repeat this process
several times, waiting between retightening. This is necessary because Teflon will cold flow and
require a certain amount of time to properly seat. Continue the process until the bolts no longer
require retightening.
END OF ASSEMBLY PROCEDURE
26
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
C.
Single Internal Mech. Seal, Type 9A Installation (Refer to Drawings on Pages 42-43)
C1
Install the mechanical seal O-ring (17A) into the seal housing (3).
Caution!
Do not reuse O-rings.
NOTE: Pumps with an earlier design did not use the mechanical seal O-ring. Omit this step if
the seal housing does not contain an internal O-ring groove.
C2
Using the Seal Press Bushing (P/N 621030, supplied with the pump) and a
mechanical press, install the new single mechanical seal (17) into the seal housing
(3) with orientation as shown in the diagram below.
Caution!
Do not handle or scratch the lapped face of the seal.
NOTE: The Seal Press Bushing is shown to the left. It
is used to apply even pressure on the flange of the
mechanical seal during installation.
Counterbored
Side
Install the mechanical seal as follows:
1) Place the seal housing on the base of the press with
its flange facing up.
2) Place the end of the mechanical seal into the inside
bore of the seal housing with the working surface of the
seal facing up.
Flat
Side
3) Place the counter-bored side of the Seal Press
Bushing on top of the metal flange of the seal.
4) Using the mechanical press, press the flat side of the
Seal Press Bushing until the bottom surface of the seal’s
flange contacts the counter-bored surface of the seal
housing.
27
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
C3
Install the shaft wiper (12) into the seal housing (3) counter-bore.
C4
Insert the shaft (4) into the seal housing (3) and mechanical seal (17).
C5
Install O-ring (19) into the counter-bore of the seal seat (18).
Caution!
Do not reuse O-rings.
C6
Place the seal seat & O-ring assembly (18 & 19) into position on the shaft (4).
C7
Install the drain plug (13) into the seal housing (3).
NOTE: Apply Teflon tape or anti-seize compound to the threads of the drain plug to
prevent leakage and galling.
C8
Mount the pump shaft-seal assembly to the driver shaft and mounting bracket (14).
NOTE: The seal housing should be fully seated into the mounting bracket counter-bore.
Do not fully tighten the shaft setscrews (11) at this time. Orient the seal housing (3) so that
the drain plug (13) is facing down.
CONTINUE ASSEMBLY ON PAGE 31
28
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
D.
Double Mechanical Seal, Type 9T Installation (Refer to Drawings on Pages 44-45)
D1
Install O-ring (19) into the groove of the inner seal seat (18).
Caution!
Do not reuse O-rings.
D2
Press the seal seat & O-ring assembly (18 & 19) into the seal housing (3).
D3
Place the gland plate (12) on the shaft (4).
D4
Install O-ring (23) into the groove of the outer seal seat (22).
Caution!
Do not reuse O-rings.
D5
Place the outer seal seat & O-ring assembly (22 & 23) on the shaft (4).
D6
Install the double mechanical seal (17), with retaining clips, onto the shaft (4), being
careful not to damage the seal’s wedge; then remove the retaining clips.
Caution!
Do not handle or scratch the lapped faces of the seal. Do not remove
the retaining clips from the seal until after the seal is placed on the shaft.
NOTE: A new Type 9T double mechanical seal comes with four retaining clips installed on
the seal body. The retaining clips compress the seal springs, eliminating spring pressure
on the seal’s wedge. Once the retaining clips are removed, the spring pressure will cause
the wedge to seal against the shaft.
D7
Install the shaft (4), containing the gland plate (12), outer seal seat & O-ring assembly
(22 & 23) and mechanical seal (17), into the seal housing (3).
D8
Install the gland screws (20) with lock-washers (21).
NOTE: Refer to Appendix 1 for the torque specifications of the gland screws.
D9
Using an Allen (hex) key, slide the seal retainer (metal body) to position the setscrews
centrally within the 1/8” NPT ports; then rotate the shaft in steps and tighten all
setscrews.
D10
Mount the pump shaft-seal assembly to the driver shaft and mounting bracket (14).
NOTE: The seal housing should be fully seated into the mounting bracket counter-bore.
Do not fully tighten the shaft setscrews (11) at this time. Orient the seal housing (3) so that
the 1/8” NPT ports are vertical.
NOTE: The open 1/8” NPT ports of the seal housing must be connected to the fluid lubrication loop for
supporting the double mechanical seal during operation of the pump (see Section 4.2.2).
Caution!
Failure to properly support the Double Mechanical Seal when operating
the pump will cause premature seal wear and leakage.
CONTINUE ASSEMBLY ON PAGE 31
29
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
E.
Packing Seal Installation (Refer to Drawings on Pages 46-47)
E1
Insert four packing rings (17) into the seal housing (3).
NOTE: For Teflon packing rings, stagger the splits in the rings by 90 to 180 degrees.
Graphoil packing rings use a solid ring design and therefore do not require staggering.
E2
Insert the lantern ring (18).
E3
Insert four more packing rings (17), as described in Step E1.
E4
Insert the shaft (4) into the seal housing (3).
E5
Install the split gland (12) using two sets of gland screws (20) and lock-washers (21).
Caution!
Do not over-tighten the gland screws. For low-viscosity fluids, the
packing compression must be adjusted during pump operation to
allow a leakage rate of 8 to 10 drops per minute (see Section 4.2.1).
E6
Install the grease fitting (19) on one side of the seal housing (3) and the drain plug
(13) on the other side.
NOTE: Apply Teflon tape or anti-seize compound to the threads of the fitting and plug to
prevent leakage and galling.
E7
Mount the pump shaft-seal assembly to the driver shaft and mounting bracket (14).
NOTE: The seal housing should be fully seated into the mounting bracket counter-bore.
Do not fully tighten the shaft setscrews (11) at this time. Orient the seal housing (3) so that
the grease fitting (19) is facing up and the drain plug (13) is facing down.
CONTINUE ASSEMBLY ON PAGE 31
30
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Assembly Procedure (Continued for Pumps with Open-Bracket Design):
Installation of Impeller:
5
A.
Pump with Double Mechanical Seal (Type 9T) or Packing: Place the impeller (1) on the end of
the pump shaft (4) and align the setscrew bores; then attach the impeller to the shaft using the
impeller setscrew (9).
B.
Pump with Single Internal Mechanical Seal (Type 9A): Place the impeller (1) on the pump shaft
(4). Install the lock collar (10) on the impeller; then secure the impeller to the shaft with the impeller
screw (9). Torque the impeller screw to 60 in-lbs.
NOTE: The impeller was redesigned in 2021 for the new Type 21 & 9T single mechanical seals. If a new impeller is
ordered for use with a pump having a Type 9A single mechanical seal, an Impeller Spacing Washer (P/N 620710
in 316 SS; 620711 in Alloy-C) is required, as shown below.
6
Place the volute O-ring or gasket (5) in
position on the seal housing (3).
Caution!
Do not reuse O-rings or gaskets.
31
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Adjusting Impeller Clearance:
7
Verify that the seal housing (3) is fully seated in the mounting bracket (14) counter-bore. A gap
of .016 +/- .002 in. (14 to 18 mils) between the rear of the impeller and the face of the seal
housing will center the impeller inside the pump housing. (Note: For pumps with a single
mechanical seal, this clearance will also set the compression of the seal, as shown below.)
Loosen the setscrews (11) and position the impeller-shaft assembly on the driver shaft to attain
the proper clearance; then tighten the two setscrews to lock the assembly in place.
NOTE: Shims can be used to position the impeller to the specified clearance. Tighten the dog-point setscrews
(11) into the keyway of the driver shaft.
8
Turn the impeller (1) by hand to ensure that it rotates freely.
NOTE: The impeller should not rub against the seal housing but some drag from the seal will be felt.
Volute-Bracket Assembly:
9
Install the volute (2) to the seal housing (3)
and mounting bracket (14) using four sets of
bolts (6), nuts (7) and lock washers (8).
NOTE: Apply anti-seize compound to the bolts.
Refer to Appendix 1 for the torque specifications
of the fasteners. When tightening the bolts, use a
star pattern torque sequence on the fasteners to
ensure even compression on the O-ring’s
surface. With Teflon (PTFE) O-rings, repeat this
process several times, waiting between
retightening. This is necessary because Teflon
will cold flow and require a certain amount of time
to properly seat. Continue the process until the
bolts no longer require retightening.
END OF ASSEMBLY PROCEDURE
32
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 1: Fastener Torque Specifications
Maximum Torque Values for 18-8 Stainless Steel Bolts
Model Code
Position 4 –
Seal Type
Function
Volute – Bracket 1
Assembly
0, 1, 6
Volute –
Assembly
Bracket 2
2, 3, 4, 5, 7
Bolt Size
Bolt
Type
Quantity
(per
Pump)
5/16-18 UNC x 1
SHCS
3
5/16-18 UNC x 1-1/2
SHCS
1
5/16-18 UNC x 1-3/4
SHCS
3
5/16-18 UNC x 2-1/4
SHCS
1
Max Torque
Specifications
(in-lb)
(N-m)
132
14.9
Impeller - Shaft
Assembly –
SMS
2, 3
1/4-20 UNC x 7/16
HHCS
1
75
8.5
Gland - Seal Housing
Assembly –
Packing
5, 7
1/4-28 UNF x 1
HHCS
2
94.0
10.6
Gland - Seal Housing
Assembly –
DMS
4
1/4-28 UNF x 5/8
HHCS
2
94.0
10.6
BOLTS for MOTOR or POWER FRAME to BRACKET ASSEMBLY:
Motor*- Bracket 1 or
Power Frame - Bracket
Assembly –
SMS
0, 1, 6
3/8-16 UNC x 1
SHCS
4
236
26.7
Motor*- Bracket 2 or
Power Frame - Bracket
Assembly –
SMS
2, 3
3/8-16 UNC x 1
HHCS
4
236
26.7
Motor*- Bracket 2 or
Power Frame - Bracket
Assembly –
Packing & DMS
4, 5, 7
3/8-16 UNC x 2-1/2
HHCS
4
236
26.7
* NEMA 56C, 143TC & 145TC motor frames
1
2
HHCS = Hex Head Cap Screw
SHCS = Socket Head Cap Screw
Closed design w/ Integral Seal Housing (316 SS)
Open design (Cast Iron, Blue Epoxy-Painted)
SMS = Single Mechanical Seal
DMS = Double Mechanical Seal
Seal Codes:
0
1
2
3
4
5
6
7
Single Internal Mechanical, Type 21, 18-8 SS/Carbon/SiC
Single Internal Mechanical, Type 9T, 316 SS/Carbon/SiC
Single Internal Mechanical, Type 9A, 316 SS/Carbon/SiC
Single Internal Mechanical, Type 9A, 316 SS/Teflon/SiC
Double Mechanical, Type 9T, 316 SS/Carbon/SiC
Lantern Ring/Teflon Packing
Single Internal Mechanical, Type 9T, 316 SS/Teflon/SiC
Lantern Ring/Graphoil Packing
33
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 2: Maintenance Tool List
The following tools (or equivalents) are required when performing maintenance on the pumps:
Pump with SINGLE MECHANICAL SEAL, Type 21 or 9T
Tool #
Tool
Function
1
Allen Wrench, 1/4” Hex
For volute mounting bolts.
2
Allen Wrench, 1/8” Hex
For impeller and shaft setscrews.
3
Allen Wrench, 5/16” Hex
For mounting bracket bolts.
Pump with SINGLE MECHANICAL SEAL, Type 9A
Tool #
Tool
Function
1
Allen Wrench, 1/4” Hex
For volute mounting bolts.
2
Allen Wrench, 1/8” Hex
For shaft setscrews.
3
Wrench, 7/16”
For impeller screw and 1/8” NPT plugs.
4
Wrench, 9/16”
For mounting bracket bolts.
5
Seal Press Bushing *
For pressing mechanical seal into seal housing.
* Aluminum tool supplied with new pump (see Page 21).
Pump with DOUBLE MECHANICAL SEAL, Type 9T
Tool #
Tool
Function
1
Allen Wrench, 1/4” Hex
For volute mounting bolts.
2
Allen Wrench, 1/8” Hex
For impeller and shaft setscrews.
3
Allen Wrench, 3/32” Hex
For double mechanical seal setscrews.
4
Wrench, 7/16”
For gland plate bolts and 1/8” NPT plugs.
5
Wrench, 9/16”
For mounting bracket bolts.
Pump with PACKING SEAL
Tool #
Tool
Function
1
Allen Wrench, 1/4” Hex
For volute mounting bolts.
2
Allen Wrench, 1/8” Hex
For impeller and shaft setscrews.
3
Wrench, 7/16”
For gland plate bolts, 1/8” NPT plugs and grease fitting.
4
Wrench, 9/16”
For mounting bracket bolts.
5
Packing Puller *
For removal of packing rings.
* Any tool capable of removing the packing from the seal housing.
34
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 3: Pump Bill of Materials (BOM)
BOM for Model 620 – Sealed (Type 21 & Type 9T Single)
Parts Not Dependent on Seal Type
Drawing
Ref. #
2
4
5
6
8
9
11
13
14
15
16
18
19
–
Part Description
Threaded (NPT)
Flanged (ANSI 150# RF)
5/8” Bore (NEMA 56C or PF)
Shaft *
7/8” Bore (NEMA 143TC/145TC)
Gasket
O-ring/Gasket, *
O-ring (2-154)
Volute
Gasket
5/16-18 x 1 SHCS
Bolt, Volute
5/16-18 x 1-1/2 SHCS
Lock Washer, Volute (5/16)
Setscrew, Impeller (1/4-28 x 3/8 SHSS-HD)
Setscrew, Shaft (1/4-28 x 3/8 SHSS-FD)
Plug, 1/8” NPT (Volute)
Bracket / Seal Housing
(NEMA 56C thru 145TC or Power Frame)
Bolt, Motor or PF (3/8-16 x 1 SHCS)
Lock Washer, Motor or Power Frame (3/8)
Seal Seat *
O-ring, Seal Seat (2-216) *
Power Frame (Pedestal) 2
Volute
316 SS Pump
Part #
Material
620003
316 SS
620005
316 SS
620320
316 SS
620321
620601
Teflon
620621
Viton
620603
Graphoil
621105
18-8 SS
621109
18-8 SS
3126341
18-8 SS
S620000
316 SS/Teflon
621104
18-8 SS
362304
316 SS
Qty.
1
1
1
3
1
4
1
2
21
620220
316 SS
1
781118
S1004
781547
781691
A-620804
18-8 SS
18-8 SS
SiC
Viton
CI/CS/Epoxy
4
4
1
1
1
1 - Volute may contain an additional plug on the outlet port (see Pages 16 & 39).
2 - Optional Item
Parts for SINGLE INTERNAL MECHANICAL SEAL, Type 21
Drawing
Ref. #
1
17
20
Part Description
3.75” Dia. (Full Size)
3.50” Dia. (Reduced Size)
Impeller
3.25” Dia. (Reduced Size)
(for Type 21 Seal)
3.00” Dia. (Reduced Size)
2.75” Dia. (Reduced Size)
Single Mechanical Seal (Assembly), Type 21 *
Spring Support Washer
316 SS Pump
Part #
Material
620301
620305
620306
316 SS
620307
620308
A-627010
18-8 SS/Carbon
620330
316 SS
Qty.
1
1
1
Note: Part # A-627010 includes Spring, Holder Assembly and Sealing Ring (see Drawing #1A on Page 39).
Parts for SINGLE INTERNAL MECHANICAL SEAL, Type 9T
Drawing
Ref. #
Part Description
3.75” Dia. (Full Size)
3.50” Dia. (Reduced Size)
3.25” Dia. (Reduced Size)
3.00” Dia. (Reduced Size)
2.75” Dia. (Reduced Size)
1
Impeller, w/ Pin
(for Type 9T Seal)
17
Single Mechanical Seal, Type 9T (w/ Pin Hole) *
* Primary repair components.
35
316 SS Pump
Part #
Material
620301-9
620305-9
620306-9
316 SS
620307-9
620308-9
A-627020
316 SS/Carbon
A-627021
316 SS/Teflon
Qty.
1
1
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 3: Pump Bill of Materials (BOM)
BOM for Model 620 – Sealed (Type 9A Single)
Parts Not Dependent on Seal Type
Drwg.
Ref. #
1
2
5
6
7
8
11
13
14
16
–
Part Description
3.75” Dia. (Full Size)
3.50” Dia. (Reduced Size)
Impeller
3.25” Dia. (Reduced Size)
3.00” Dia. (Reduced Size)
2.75” Dia. (Reduced Size)
Threaded (NPT)
Volute
Flanged (ANSI 150# RF)
Gasket
O-ring/Gasket, *
O-ring (2-154)
Volute
Gasket
5/16-18 x 1-3/4 SHCS
Bolt, Volute
5/16-18 x 2-1/4 SHCS
Nut, Volute (5/16-18 Hex)
Lock Washer, Volute (5/16)
Setscrew, Shaft (1/4-28 x 3/8 SHSS-FD)
Plug, 1/8” NPT (Volute)
Bracket, Mounting
(NEMA 56C thru 145TC or Power Frame)
Lock Washer, Motor or Power Frame (3/8)
Power Frame (Pedestal)
2
316 SS Pump
Part #
Material
620301
316 SS
620305
316 SS
620306
316 SS
620307
316 SS
620308
316 SS
620003
316 SS
620005
316 SS
620601
Teflon
620621
Viton
620603
Graphoil
621101
18-8 SS
621102
18-8 SS
621103
18-8 SS
3126341
18-8 SS
621104
18-8 SS
362304
316 SS
Alloy-C Pump
Part #
Material
620302
Alloy-C
620309
Alloy-C
620310
Alloy-C
620311
Alloy-C
620312
Alloy-C
620002
Alloy-C
620006
Alloy-C
620601
Teflon
620621
Viton
620603
Graphoil
621101
18-8 SS
621102
18-8 SS
621103
18-8 SS
3126341
18-8 SS
621104
18-8 SS
362301
Alloy-C
620801
CI/Epoxy
620801
CI/Epoxy
1
S1004
18-8 SS
CI/CS/
Epoxy
S1004
18-8 SS
CI/CS/
Epoxy
4
A-620804
1 - Volute may contain an additional plug on the outlet port (see Pages 16 & 39).
A-620804
Qty.
1
1
1
3
1
4
4
2
21
1
2 - Optional Item
Parts for SINGLE INTERNAL MECHANICAL SEAL, Type 9A
Drwg.
Ref. #
3
9
10
12
13
15
Seal Housing (SMS)
5/8” Bore (NEMA 56C or PF)
Shaft
7/8” Bore (NEMA 143TC/145TC)
Screw, Impeller (1/4-20 x 7/16 HHCS)
Lock Collar, Impeller
Wiper, Shaft
Plug, 1/8” NPT (Seal Housing)
Bolt, Motor or PF (3/8-16 x 1 HHCS)
17
Single Mechanical Seal, Type 9A *
4
17A
18
19
316 SS Pump
Part #
Material
620112
316 SS
620401
316 SS
620421
620520
316 SS
620501
316 SS
620701
Teflon
362304
316 SS
620825
18-8 SS
316 SS/
A-867011
Carbon
316 SS/
A-867016
Teflon
620614
Viton
621006
SiC
620610
Teflon
620623
Viton
Part Description
O-ring, Mechanical Seal (2-024) *
Seal Seat *
O-ring, Seal Seat (.397” ID x .070”) *
* Primary repair components.
36
Alloy-C Pump
Part #
Material
620110
Alloy-C
620402
Alloy-C/
303 SS
620422
620521
Alloy-C
620502
Alloy-C
620701
Teflon
362301
Alloy-C
620825
18-8 SS
Alloy-C/
A-867008
Carbon
Alloy-C/
A-867077
Teflon
620614
Viton
621006
SiC
620610
Teflon
620623
Viton
Qty.
1
1
1
1
1
1
4
1
1
1
1
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 3: Pump Bill of Materials (Continued)
BOM for Model 620 – Sealed (Type 9T Double & Packing)
Parts for DOUBLE MECHANICAL SEAL, Type 9T
Drwg.
Ref. #
3
4
9
316 SS Pump
Part #
Material
620117
316 SS
620411
316 SS/
303 SS
620431
316 SS/
S620000
Teflon
CS/
620802
Epoxy
621209
316 SS
620831
18-8 SS
316 SS/
A-867031
Carbon
376103
SiC
620613
Viton
S620013
18-8 SS
863701
18-8 SS
621018
SiC
620614
Viton
Part Description
Seal Housing (DMS)
5/8” Bore (NEMA 56C or PF)
Shaft
7/8” Bore (NEMA 143TC/145TC)
Setscrew, Impeller
(1/4-28 x 3/8 SHSS-HD)
10
Spacer Plate
12
15
Gland Plate
Bolt, Motor or PF (3/8-16 x 2-1/2 HHCS)
17
Double Mechanical Seal, Type 9T *
18
19
20
21
22
23
Seal Seat, Inner *
O-ring, Seal Seat, Inner (2-022) *
Screw, Gland Plate (1/4-28 x 5/8 HHCS)
Lock Washer, Gland Plate (1/4)
Seal Seat, Outer *
O-ring, Seal Seat, Outer (2-024) *
Alloy-C Pump
Part #
Material
620118
Alloy-C
620410
Alloy-C/
303 SS
620430
Alloy-C/
S620001
Teflon
CS/
620802
Epoxy
621209
316 SS
620831
18-8 SS
316 SS/
A-867031
Carbon
376103
SiC
620613
Viton
S620013
18-8 SS
863701
18-8 SS
621018
SiC
620614
Viton
Qty.
1
1
1
1
1
4
1
1
1
2
2
1
1
Parts for PACKING SEAL
Drwg.
Ref. #
3
4
9
316 SS Pump
Part #
Material
620115
316 SS
620411
316 SS/
303 SS
620431
316 SS/
S620000
Teflon
CS/
620802
Epoxy
621204
316 SS
362304
316 SS
620831
18-8 SS
866501
Teflon
866409
Graphoil
867109
Teflon
867201
303 SS
362005
18-8 SS
863701
18-8 SS
Part Description
Seal Housing (PS)
5/8” Bore (NEMA 56C or PF)
Shaft *
7/8” Bore (NEMA 143TC/145TC)
Setscrew, Impeller
(1/4-28 x 3/8 SHSS-HD)
10
Spacer Plate
12
13
15
Gland Plate, Split *
Plug, 1/8” NPT (Seal Housing)
Bolt, Motor or PF (3/8-16 x 2-1/2 HHCS)
17
Packing Ring *
18
19
20
21
Lantern Ring
Grease Fitting, 1/8” NPT (Seal Housing)
Screw, Gland Plate (1/4-28 x 1 HHCS)
Lock Washer, Gland Plate (1/4)
Alloy-C Pump
Part #
Material
620114
Alloy-C
620410
Alloy-C/
303 SS
620430
Alloy-C/
S620001
Teflon
CS/
620802
Epoxy
621205
Alloy-C
362301
Alloy-C
620831
18-8 SS
866501
Teflon
866409
Graphoil
867109
Teflon
867201
303 SS
362005
18-8 SS
863701
18-8 SS
* Primary repair components.
NOTE: Drawing Reference Numbers above correspond to Sectional and Exploded View Drawings in Appendix 4.
HHCS = Hex Head Cap Screw
SHCS = Socket Head Cap Screw
SHSS-FD = Socket Head Set Screw, Full Dog
SHSS-HD = Socket Head Set Screw, Half Dog
PS = Packing Seal
SMS = Single Mechanical Seal
DMS = Double Mechanical Seal
PF = Power Frame
37
CI = Cast Iron
CS = Carbon Steel
SS = Stainless Steel
SiC = Silicon Carbide
Qty.
1
1
1
1
2
1
4
8
1
1
2
2
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings
Sectional Drawing #1 – Model 620 with SINGLE INTERNAL MECHANICAL SEAL, Type 21
MOTOR
or
Power
Frame
Ref. #
Description
Qty.
Ref. #
Description
Qty.
1
Impeller
1
11
Setscrew, Shaft
2
2
Volute
1
12
3
–
1
13
–
2*
4
NA
Shaft
NA
Plug, Volute (1/8 NPT)
14
Bracket / Seal Housing
1
5
O-ring/Gasket, Volute
6
Bolt,
Volute
7
1
15
Bolt, Driver (3/8-16 x 1 SHCS)
4
5/16-18 x 1 SHCS
3
16
Lock Washer, Driver (3/8)
4
5/16-18 x 1-1/2 SHCS
1
17
Single Mech. Seal, Type 21 **
1
NA
Lock Washer, Volute (5/16)
4
18
Seal Seat
1
8
4
19
O-ring, Seal Seat
1
9
Setscrew, Impeller
1
20
Spring Support Washer **
1
10
NA
–
–
–
–
* Two volute plugs are not shown. Volute may have an optional third plug on the outlet port (see Pages 16 & 39).
** Item 17 includes the Spring, Holder Assembly and Sealing Ring; Item 20 is a part of the Type 21 Seal (see Page 39).
38
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Exploded View Drawing #1: Model 620 with SINGLE INTERNAL MECHANICAL SEAL, Type 21
Exploded View Drawing #1A: Type 21 Single Internal Mechanical Seal
39
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Sectional Drawing #2 – Model 620 with SINGLE INTERNAL MECHANICAL SEAL, Type 9T
See Page 41 for
detailed drawing
of Type 9T Single
Mechanical Seal.
MOTOR
or
Power
Frame
Ref. #
Description
Qty.
Ref. #
Description
Qty.
1
Impeller *
1
11
Setscrew, Shaft
2
2
Volute
1
12
3
–
1
13
–
2 **
4
NA
Shaft
NA
Plug, Volute (1/8 NPT)
14
Bracket / Seal Housing
1
5
O-ring/Gasket, Volute
6
Bolt,
Volute
7
1
15
Bolt, Driver (3/8-16 x 1 SHCS)
4
5/16-18 x 1 SHCS
3
16
Lock Washer, Driver (3/8)
4
5/16-18 x 1-1/2 SHCS
1
17
Single Mechanical Seal, Type 9T
1
NA
Lock Washer, Volute (5/16)
4
18
Seal Seat
1
8
4
19
O-ring, Seal Seat
1
9
Screw, Impeller
1
–
–
–
10
NA
–
–
–
–
* Includes drive pin (see detailed drawing of Type 9T Seal on Page 41).
** Two volute plugs are not shown. Volute may have an optional third plug on the outlet port (see Pages 16 & 41).
40
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Exploded View Drawing #2: Model 620 with SINGLE INTERNAL MECHANICAL SEAL, Type 9T
Sectional Drawing #2A – Type 9T Single Internal Mechanical Seal
41
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Sectional Drawing #3 – Model 620 with SINGLE INTERNAL MECHANICAL SEAL, Type 9A
17A
See Page 31 for
detailed drawing
of Type 9A Single
Mechanical Seal.
MOTOR
or
Power
Frame
Ref. #
Description
Qty.
Ref. #
Description
Qty.
1
Impeller
1
11
Setscrew, Shaft
2
2
Volute
1
12
Wiper, Shaft
1
3
Seal Housing
1
13
Plug, 1/8 NPT
3*
4
Shaft
1
14
Bracket, Mounting
1
5
O-ring/Gasket, Volute
1
15
Bolt, Driver (3/8-16 x 1 HHCS)
4
5/16-18 x 1-3/4 SHCS
3
16
Lock Washer, Driver (3/8)
4
5/16-18 x 2-1/4 SHCS
Single Mechanical Seal, Type 9A
1
O-ring, Mechanical Seal
1
6
Bolt,
Volute
1
17
7
Nut, Volute (5/16-18 Hex)
4
17A
8
Lock Washer, Volute (5/16)
4
18
Seal Seat
1
9
Screw, Impeller
1
19
O-ring, Seal Seat
1
10
Lock Collar, Impeller
1
–
–
–
* Two volute plugs are not shown. Volute may have an optional third plug on the outlet port (see Pages 16 & 43).
42
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Exploded View Drawing #3: Model 620 with SINGLE INTERNAL MECHANICAL SEAL, Type 9A
43
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Sectional Drawing #4 – Model 620 with DOUBLE MECHANICAL SEAL, Type 9T
MOTOR
or
Power
Frame
Ref. #
Qty.
Ref. #
1
Impeller
Description
1
12
Gland Plate
Description
1
2
Volute
1
13
Plug, 1/8 NPT
2*
3
Seal Housing
1
14
Bracket, Mounting
1
4
Shaft
1
15
Bolt, Driver (3/8-16 x 2-1/2 HHCS)
4
5
O-ring/Gasket, Volute
1
16
Lock Washer, Driver (3/8)
4
6
Bolt,
Volute
5/16-18 x 1-3/4 SHCS
3
17
Double Mechanical Seal, Type 9T
1
5/16-18 x 2-1/4 SHCS
1
18
Seal Seat, Inner
1
7
Nut, Volute (5/16-18 Hex)
4
19
O-ring, Seal Seat, Inner
1
8
Lock Washer, Volute (5/16)
4
20
Screw, Gland (1/4-28 x 5/8 HHCS)
2
9
Setscrew, Impeller
1
21
Lock Washer, Gland (1/4)
2
10
Spacer Plate
1
22
Seal Seat, Outer
1
11
Setscrew, Shaft
2
23
O-ring, Seal Seat, Outer
1
* Two volute plugs are not shown. Volute may have an optional third plug on the outlet port (see Pages 16 & 45).
44
Qty.
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Exploded View Drawing #4: Model 620 with DOUBLE MECHANICAL SEAL, Type 9T
45
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings
Sectional Drawing #5 – Model 620 with PACKING SEAL
MOTOR
or
Power
Frame
Ref. #
Qty.
Ref. #
1
Impeller
Description
1
11
Setscrew, Shaft
Description
Qty.
2
Volute
1
12
Gland Plate, Split
2
3
Seal Housing
1
13
Plug, 1/8 NPT
3*
4
Shaft
1
14
Bracket, Mounting
1
5
O-ring/Gasket, Volute
2
1
15
Bolt, Driver (3/8-16 x 2-1/2 HHCS)
4
5/16-18 x 1-3/4 SHCS
3
16
Lock Washer, Driver (3/8)
4
5/16-18 x 2-1/4 SHCS
6
Bolt,
Volute
1
17
Packing Ring
8
7
Nut, Volute (5/16-18 Hex)
4
18
Lantern Ring
1
8
Lock Washer, Volute (5/16)
4
19
Grease Fitting, 1/8 NPT
1
9
Setscrew, Impeller
1
20
Screw, Gland (1/4-28 x 1 HHCS)
2
10
Spacer Plate
1
21
Lock Washer, Gland (1/4)
2
* Two volute plugs are not shown. Volute may have an optional third plug on the outlet port (see Pages 16 & 47).
46
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Exploded View Drawing #5: Model 620 with PACKING SEAL
47
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Dimensional Drawing #1: Model 620 with Type 21 or 9T Single Mechanical Seal
& Close-Coupled Mounting (Closed-Bracket Design)
Model 620 with Type 21 or 9T Single Mechanical Seal & NPT Ports
C*
A
B
D
4xH
Model 620 with Type 21 or 9T Single Mechanical Seal & Flanged Ports
C*
A
Units: inches [mm]
B
D
4xH
* See dimensional data from motor manufacturer for “C” Dimension.
Dimensional Data for NEMA C-Face Motors (inches)
Motor Frame
A
B
D
56C
3
2-9/16
4-7/8
11/32 wide slot
143TC
4
2-7/8
5-1/2
11/32 dia. thru-hole
145TC
5
2-7/8
5-1/2
11/32 dia. thru-hole
48
H
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Dimensional Drawing #2: Model 620 with Type 21 or 9T Single Mechanical Seal
& Long-Coupled Mounting with Power Frame (Closed-Bracket Design)
Model 620 with Type 21 or 9T Single Mechanical Seal, NPT Ports & Power Frame
Model 620 with Type 21 or 9T Single Mechanical Seal, Flanged Ports & Power Frame
Units: inches [mm]
49
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Dimensional Drawing #3: Model 620 with NPT Ports
& Close-Coupled Mounting (Open-Bracket Design)
Model 620 with Type 9A Single Mechanical Seal & NPT Ports
C*
A
B
D
4xH
Model 620 with Packing or Double Mechanical Seal & NPT Ports
C*
A
B
D
4xH
* See dimensional data from motor manufacturer for “C” Dimension.
Units: inches
Dimensional Data for NEMA C-Face Motors (inches)
Motor Frame
A
B
D
56C
3
2-9/16
4-7/8
11/32 wide slot
143TC
4
2-7/8
5-1/2
11/32 dia. thru-hole
145TC
5
2-7/8
5-1/2
11/32 dia. thru-hole
50
H
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Dimensional Drawing #4: Model 620 with Flanged Ports
& Close-Coupled Mounting (Open-Bracket Design)
Model 620 with Type 9A Single Mechanical Seal & Flanged Ports
C*
A
B
D
4xH
Model 620 with Packing or Double Mechanical Seal & Flanged Ports
C*
A
B
D
4xH
* See dimensional data from motor manufacturer for “C” Dimension.
Units: inches
Dimensional Data for NEMA C-Face Motors (inches)
Motor Frame
A
B
D
56C
3
2-9/16
4-7/8
11/32 wide slot
143TC
4
2-7/8
5-1/2
11/32 dia. thru-hole
145TC
5
2-7/8
5-1/2
11/32 dia. thru-hole
51
H
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Dimensional Drawing #5: Model 620 with NPT Ports
& Long-Coupled Mounting with Power Frame (Open-Bracket Design)
Model 620 with Type 9A Single Mechanical Seal, NPT Ports & Power Frame
Model 620 with Packing or Double Mechanical Seal, NPT Ports & Power Frame
Units: inches
52
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 4: Reference Drawings (Continued)
Dimensional Drawing #6: Model 620 with Flanged Ports
& Long-Coupled Mounting with Power Frame (Open-Bracket Design)
Model 620 with Type 9A Single Mechanical Seal, Flanged Ports & Power Frame
Model 620 with Packing or Double Mechanical Seal, Flanged Ports & Power Frame
Units: inches
53
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 5: Troubleshooting Guide
Troubleshooting Guide – Part 1
Problem
Possible Cause
Corrective Action
Wrong direction of rotation
Verify suction pipe is submerged.
Increase suction pressure.
Open suction valve.
Reverse motor leads.
Valves closed
Open all suction and discharge valves.
Bypass valve open
Clogged strainer
Close bypass valve.
Tighten connections.
Apply sealant to all threads.
Verify suction pipe is submerged.
Clean strainer.
Clogged impeller
Disassemble and remove blockage.
Impeller greatly worn or damaged
Disassemble and replace impeller.
Pump not primed
No discharge
Air leak in suction line
Bypass valve open
Increase suction pressure.
Verify suction piping is not too long.
Fully open any suction valves.
Close bypass valve.
Partly clogged strainer
Clean strainer.
Partly clogged impeller
Disassemble and remove blockage.
Increase driver speed, if possible.
Use larger size pump, if required.
Disassemble and replace impeller.
Suction pressure too low
Insufficient discharge
Speed too low
Impeller worn or damaged
Pump not properly primed
Loss of suction after
satisfactory operation
Air leaks in suction line
Air or vapor pockets in suction line
Increase in fluid viscosity
Fluid viscosity higher than specified
Liquid specific gravity higher than
expected
Excessive power
consumption
Total head greater than specified
Total head lower than specified,
pumping higher flow than expected
Total head higher than rating with flow
at rating
Rotating parts binding or severely worn
54
Reprime pump.
Tighten connections.
Apply sealant to all threads.
Verify suction pipe is submerged.
Rearrange piping as necessary.
Heat fluid to reduce viscosity.
Reduce pump speed.
Heat fluid to reduce viscosity.
Reduce pump speed.
Increase driver horsepower.
Reduce pump speed.
Increase driver horsepower.
Increase pipe diameter.
Decrease pipe run.
Install throttle valve.
Install impeller with correct diameter.
Disassemble and replace worn parts.
Centry® Series Centrifugal Pumps
Model 620 – Sealed
Liquiflo Installation, Operation & Maintenance Manual
Appendix 5: Troubleshooting Guide (Continued)
Troubleshooting Guide – Part 2
Problem
Possible Cause
Corrective Action
Install suction strainer.
Limit solids concentration.
Reduce pump speed or use larger pump
running at lower speed.
Use materials of construction that are
acceptable for fluid being pumped.
Install power sensor to stop pump.
Increase pipe diameter.
Decrease pipe run.
Abrasives in fluid
Rapid pump wear
Corrosion wear
Extended dry running
Discharge pressure too high
Excessive noise and
vibration
Partly clogged impeller causing
imbalance
Damaged impeller and/or shaft
Suction and/or discharge piping not
anchored or properly supported
Disassemble and replace damaged parts.
Anchor per Hydraulic Institute Standards.
Worn motor bearings
Tighten hold-down bolts on pump and motor or
adjust stilts.
Inspect grout and regrout if necessary.
Replace bearings or motor.
Pump cavitation
Increase NPSH available.
Base not rigid enough
Static seal failure caused by chemical
incompatibility or thermal breakdown
Static seal failure caused by improper
installation
Excessive product
leakage
Disassemble and remove blockage.
Mechanical seal worn or damaged
Pump port connections not properly
sealed
Crevice corrosion of pump housing
material
55
Use O-rings or gaskets made of material
compatible with fluid and temperature of the
application.
Install O-rings or gaskets without twisting,
bending or pinching.
Use star-pattern torque sequence on housing
bolts during assembly.
Allow Teflon O-rings to cold flow and seat
during tightening.
Torque bolts to specification.
Disassemble and replace mechanical seal.
Prime pump and avoid dry running.
Use Teflon tape or other suitable sealant.
Use gaskets compatible with fluid and
temperature of the application.
Only pump chemicals that are compatible with
the pump housing material.
Decrease temperature to reduce corrosion rate
to acceptable value.
Flush idle pumps that are used to pump
corrosive chemicals.
Eliminate contaminants in the fluid that can
accelerate corrosion wear.

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