Raimondi 3-way Globe Valve for feedwater outlet bypass IOM Owner's manual

Raimondi 3-way Globe Valve for feedwater outlet bypass IOM Owner's manual
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
RAIMONDI
Index
Introduction
Introduction
1
Verification upon receipt and
storage before installation
1
2.
Handling
1
3.
Installation
2
4.
Scheduled maintenance
2
5.
Possible damage and relevant
solutions3
1.
6.
Disassembly instructions
4
7.
Assembly instructions
4
8.
Spare parts list
5
9.
Enclosures
6
This manual provides guidelines to be observed for the following operations:
• storage
• installation into the pipeline
• maintenance
• preservation
The manual is intended for the following personnel/staff:
• plant warehouse staff
• installers
• maintenance engineers
Warning
This symbol means “Warning” and indicates all matters relating to safety. Please read the
warning notices carefully and follow the instructions. These serve to guarantee your safety
and to prevent damage to people and property.
In addition to the instructions in this manual, specific plant safety regulations must always be
followed.
It is recommended that this manual is read carefully and entirely, before starting any
maintenance, in order to optimize intervention timing, and to ensure that suggested spare
parts and gaskets are available in the event of valve assembly.
For installation and maintenance operations no specific equipment or tools are required, other
than those usually available in the plant.
Fig. 1 - Valve lifting and handling
Emerson is always at the Customer’s disposal for any further technical information.
1. Verification upon receipt and storage before installation
When the materials arrive, it is recommended to:
• Check the integrity of the case.
• Open the case and verify that there is no damage due to transportation.
• Do not open the barrier bag (if present).
• Verify that the contents are those stated on the packing list.
• Store the valves (unless damaged) in their original packaging.
Please observe the following:
1. Store the valves in a closed, clean and dry storage room.
2. Do not place packages directly on the ground.
3. Check the packages every two months.
4. Substitute the silica gel every six months. This is not applicable in the case of barrier bag
packages.
2. Handling
During handling operations, valves must be lifted and handled as indicated in fig. 1 by using lifting
equipment (fasteners, hooks, etc.) that must be sized and selected on the basis of valve weight
(indicated in the drawings).
If there are any eyebolts in the valve body, these can be used to lift the valve.
Do not use any lifting points located on the actuator to lift the valve. These lifting points are to lift
the actuator only.
Lifting and handling must be done only by qualified personnel.
Warning
Do not use any lifting straps that are either damaged or of inadequate/unknown size.
www.valves.emerson.com
Emerson reserves the right to change the contents without notice
RAIIC-0052-EN-1310
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
3. Installation
For correct operation, the valves must be installed in horizontal pipes with the stem in vertical
position. If installed in vertical lines or in horizontal lines with the stem not vertical, maintenance is
much more difficult.
Any installation position other than those indicated may cause incorrect operation and/or rapid
deterioration.
The following operations must be performed only immediately before the installation:
1. Remove the protection caps of the end faces.
2. Check the upstream and downstream pipeline sections. Make sure that there are no solid
particles or any other kind of dirt or debris inside. If necessary, clean carefully by using an air
line.
3. Pay attention to the flow direction.
Warning
Before starting the installation of the
valve, please verify that:
• the valve class is suitable for the
required operating pressure, and
• the materials of construction are
suitable for the intended service (type
of process fluid).
Fig. 2 - Possible installation positions
Warning
Verify that the flow direction of the line corresponds to the flow direction indicated by the
arrow on the valve body.
General notes
• In order to avoid damage during welding and post welding heat treatment, we suggest to
disassemble the internal part following the instructions given in section 6 of this manual.
• In case that one end of the valve is not connected to the line for a period of time longer than
half a day, the open end must be properly closed and sealed in order to prevent entry of dirt or
debris.
• Check that there is sufficient space to easily disassemble the valve.
Position the valve and verify its alignment with the pipe. Proceed with welding in accordance with
the procedure indicated by the engineering company that designed the plant.
During site welding of the valve to the pipe, the valve and adjacent piping must be supported so
that the pipeline stresses are not transmitted to the valve body.
Usually, the first weld layer will be made with TIG, while following weld layers will be made with
the
appropriate electrode for the valve body material.
Welding and stress relieving procedures should conform to the applicable code or standard.
Position the valve and verify its alignment with the pipe. Proceed with the welding operation in
4. Scheduled maintenance
4.1 Routine inspection
Normal check
• Verify once a month that there is no leakage from packing or in the body/bonnet area.
a. In case of leakage from the packing, tighten the appropriate gland nuts and bolts according
to the procedures described in the assembly section.
b. In case of leakage from the body/bonnet gasket, tighten the bonnet support bolts as stated in
the re-assembly procedure. Otherwise de-pressurize the line as soon as possible in order to
prevent erosion.
• Verify bearings greasing and stem thread every two or three months, depending on operating
frequency.
• For actuated valves, refer also to the actuator manual in addition to the above.
Preventive
• Verify the tightness of gland bolts every three months.
• Grease the stem and bearings every six months for motorized valves and every eight months for
hand-operated valves.
• Check the travel of the gland follower every twelve months. Install a new packing when the end
of the travel is approaching.
• Disassemble critical and/or actuated valves every four years. Verify the sealing surfaces and lap
them if necessary. Substitute the bonnet gasket and the packing. Grease the stem.
• For the actuator, proceed as indicated in its maintenance manual.
Emerson reserves the right to change the contents without notice
page 2
Warning
Protect eyes with appropriate welding
masks or goggles during all welding
operations.
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
5. Troubleshooting guide
Below is a list with the most common problems.
5.1 Leakage from the packing
When there is humidity or droplets near the packing area, the stem or the gland, and these cannot
be corrected by tightening the gland bolts, you may want continuing the work of the line until
the first stop of the plant. In this case, the stem can be set in backseat position, verifying the
following:
• Packing may have hardened. In this case, it must be replaced.
• The gland is at the end of its travel. This means that the packing cannot be compressed.
Packing must be replaced.
• Scratches, scorings or other marks may be found in the stem. It may also have got bound. In
these cases, the stem must be replaced.
• The gland may be jammed on the stem because of a non-uniform tightness of the gland bolts.
Release the gland bolts. Move the gland and set it again; then tighten the bolts progressively.
5.2 Leakage from body/bonnet joint
Leakage under operation from the pressure seal joint requires immediate action, since it may
cause major damage to the valve rapidly.
Typical causes for leakage are:
• Previous incorrect reassembly of the valve.
• Re-using pressure seal gasket.
• A defect inside the valve body.
5.3 Leakage between seat and disc
In case of leakage between seat and disc, we recommend to perform closing and opening
operations with a pressure differential. If leakage persists, check that:
• No foreign material is locked between seat and disc, scoring the sealing surfaces.
• No foreign material is deposited between the seats, thus preventing the disc from closing.
• Incomplete previous closing allowed the fluid to impact onto the seal surfaces, eroding these.
• The valve has been used for line flushing, and therefore seats have been damaged by foreign
material.
For all the above cases it is absolutely necessary to disassemble the valve as soon as
possible and proceed with an inspection of the internal parts in order to reduce further
damage.
5.4 Jamming of valve along the stroke
If a higher torque is required at some points along the stroke when opening/closing the valve,
proceed as follows:
• Examine the stem and make sure that there is no picking-up in either the smooth or the
threaded parts.
• Disassemble the valve, as a seizure may be starting to form between body guides and disc.
5.5 Problems relevant to motor operators
For these problems, refer to the actuator instruction manual.
Emerson reserves the right to change the contents without notice
page 3
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
6. Disassembly Instructions
Below are the procedures to follow to disassemble valves. Before starting any operation, it is
important to:
• identify the problem
• clean the area around the valve that is to be disassembled
• arrange for a box and/or a pallet for all components
• arrange for a polyethylene sheet to protect all components and to avoid that any particles
inadvertently enter the body.
1.
2.
3.
4.
5.
6.
7.
Fully close valve.
Loosen and remove the nuts (26.1), remove the position indicator
Loosen and remove the nuts (9).
Using suitable lifting equipment, lift the handwheel/yoke assembly.
Loosen and remove the gland nuts (17), gland flange (16) and gland (15).
Remove safety ring (4).
Knock down the bonnet (2) with a soft-faced hammer to relieve the load on the segment ring
(5), by pushing them outside through the four radial holes in the body.
8. Reassemble the safety ring and nuts (4).
9. Tighten the nuts (11) of the bonnet bolts (10) evenly, until the bonnet is lifted. Remove the ring
(6) and the pressure seal gasket (7).
10. After the gasket has been removed, proceed by removing the bonnet (2) assembly with stem
(20) and disc(28).
Refer to figs. 3 and 4
7. Assembly Instructions
Before starting assembly it is recommended to verify the following points:
• Remove any dirt or particles with a wire brush or abrasive cloth; remove any oil or grease with a
suitable solvent, to avoid damage cause by foreign particles – in particular on the sealing area.
• Never re-use the old gaskets, even though they seem to be in good shape.
• Verify that there are no scratches on the body sealing area.
1. Place the disc (28) on a clean flat surface, then fit the stem (20) into the disc.
2. Fit the disc nut (30) over the stem (20), screw into the disc (28) and then tighten. Ensure that
the stem is free to move. Then tack weld the disc nut to the disc.
3. Fit the bonnet assembly with stem (20) and disc (28) into body (1).
4. Place a new pressure seal gasket on the bonnet.
5. Assemble the ring (6) and the segment rings (5).
6. Insert the safety ring (4) and tighten the nuts (10) to the torque values stated in table 2.
7. Fit the ground ring (13), a new gland packing (14), gland (15), gland flange (16) and gland nuts
(17), and tighten these evenly. DO NOT over-tighten as this will cause high friction loads on
the stem.
8. Using suitable lifting equipment, carefully lower the handwheel/yoke assembly onto the valve,
taking care not to damage the yoke studs (8). Secure the assembly by cross-tightening the
yoke nuts (9).
10. Fit the position indicator (25)
11. After the valve has been pressurized, verify that the nuts (9) are tightened by following the
tightening torque values indicated in table 2.
Emerson reserves the right to change the contents without notice
page 4
Warning
Before starting disassembly it is very
important to verify – for your safety –
that:
• the line is not pressurized
• the line is at ambient temperature
• the line is drained
• all electrical supplies have been
switched off and disconnected prior to
dismantling the valve.
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
8. Spare parts list
Emerson guarantees the supply of any spare part for a period of at least ten years from the
manufacturing date (month/year) indicated on the tag plate.
The main objective in formulating a service parts inventory policy is the capability to provide
prompt valve service, thus preventing extension of maintenance down time. To accomplish this,
it is necessary to have the proper service parts immediately available for the optimum number of
valves. This can be achieved at a minimum cost by defining the inventory on a frequency of need
basis.
To assist in reaching this objective, the field service and repair organization of Raimondi
recommends following these guidelines in order to establish inventory levels:
1. Identify the total number of valves in service by size, type number, pressure/temperature class,
tag number.
2. Identify the frequency of replacement tendency of specific parts:
Class I
Parts most frequently replaced.
Class II Parts less frequently replaced, but critical in the event of an emergency requirement.
Class III Parts seldom replaced
Class IV Hardware (e.g. nuts, bolts, pins, cap components etc.)
Class V Parts practically never requiring replacement
3. Operational reliability is defined as a probable percentage (%) of total, uninterrupted operational
time that can be expected by stocking predetermined valve component classifications.
Determine the operational reliability which is compatible with a specific company’s operational
objectives and service parts inventory investment policy. Then relate operational reliability to
part classifications, which will satisfy that need.
Guidelines are as follows:
Parts classification
Class I
Class I and II
Class I, II and III
Class I, II, III and IV
Operational reliability
70%
85%
95%
99%
4. Consult recommended spare parts list by valve type to determine quantity of parts valves to be
covered by the inventory plan.
5. Select parts and specify quantities.
Classification of spare parts
Classification
Item No.
Description
CLASS I
Parts most frequently replaced
7
14
Pressure seal
Gasket
CLASS II
Parts less frequently replaced but
critical in case of an emergency
20
15
28
30
33
Stem
Gland
Disc
Disc nut
Socket head screw
CLASS III
Parts seldom replaced
25
16
Position indicator
Gland flange
CLASS IV
Hardware (e.g. nuts, studs, pins, etc.)
8
9
10
11
18
17
Body/yoke stud
Body/yoke nut
Body/bonnet stud
Body/bonnet stud
Gland stud
Gland nut
CLASS V
Parts practically never requiring
replacement
Balance
Emerson reserves the right to change the contents without notice
page 5
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
9. Appendices
The reference drawings are those relating to the supply only. The drawings published in this
manual are typical drawings only and may not represent the valves supplied.
Fig. 3 - Typical valve
59A
51A
51
51B
59
32
35
22
23
24
27
21
20
36
3
26.1
25
26
19
18
8
17
9
16
11
15
10
14
4
5
13
6
2
7
33
By-pass
Outlet
31
30
28
1
1.3
28.1
Inlet
Table 1 - Parts list
Pos.
Part name
Material
Pos.
Part name
Material
Pos.
Part name
Material
1
1.3
2
3
4
5
6
7
8
9
10
11
13
14
Body
Body seat surface
Bonnet
Yoke
Safety ring
Segment ring
Ring
Body/bonnet gasket
Body/bonnet bolts
Body/bonnet nuts
Nuts
Bolts
Ground ring
Packing
A 105
A 182 F6A
A 105
A 105 + St 35
A 105
A 105
A 105
Pure graphite
A 193 B7
A 194 2H
A 194 2H
A 193 B7
A 182 F6A
Pure graphite
15
16
17
18
19
20
21
22
23
24
25
26
26.1
27
28
Gland
Gland flange
Gland nuts
Gland bolts
Gland gasket
Stem
Yoke nut
Bearings
Flange
Socket head screw
Position indicator
Security pin
Nut
Lubricator
Disc
A 182 F6A
A 105
A 194 2H
A 193 B7
Graphite
X35CrMo17
B 148 Gr. B
C. steel
A 105
Class 12.9
A 105
Class 12.9
Class 65
C. steel
A 105
28.1
30
31
32
33
35
36
39
51
Disc surface
Disc nut
Cylinder
O-ring
Socket head screw
Key
Stem key
Actuator
Stub PFE
Nuts
Extension
Extension key
A 182 F6A
A 182 F6A
A 182 F6A
Viton A-75° Sh.A
Stainless steel
AISI 4140
AISI 4140
Emerson reserves the right to change the contents without notice
page 6
AISI 4140
3-way globe valve for feedwater heater outlet bypass
Installation and Maintenance Instructions
Table 2 - Tightening torque values for bolts/screws
Body/yoke - Bolts/screws: A 193 B7
Ø Bolts/screws
Bonnet - Bolts/screws: A 193 B7
Torque values
M12
M16
M20
M22
M24
M30
M33
M36
Ø Bolts/screws
Kgm
(Nm)
5
10
17
29
43
61
86
112
(50)
(100)
(170)
(280)
(420)
(600)
(850)
(1100)
M12
M16
M20
M22
M24
M30
M33
M36
Torque values
Kgm
(Nm)
1
2
3
5
7,5
11
15
21
(9)
(18)
(30)
(48)
(73)
(105)
(150)
(205)
Stem Gland bolts: A 193 B7
Diam.
M16
M18
M20
M22
M24
M27
M30
M33
25,4
31,8
34,9
44,5
50,8
57,2
63,5
69,8
76,2
82,5
95,3
1,90
3,00
3,30
4,90
6,60
8,60
9,40
10,10
12,70
13,90
15,30
2,10
3,30
3,60
5,50
7,40
9,60
10,40
11,30
14,10
15,50
17,00
2,40
3,70
4,00
6,10
8,20
10,60
11,50
12,50
15,60
17,10
18,80
2,60
4,00
4,40
6,60
8,80
11,40
12,50
13,50
16,80
18,50
20,30
2,80
4,40
4,80
7,30
9,70
12,60
13,70
14,90
18,50
20,40
22,40
3,20
5,00
5,40
8,20
11,00
14,20
15,50
16,80
21,00
23,00
25,30
3,60
5,60
6,00
9,10
12,20
15,80
17,30
18,70
23,30
25,60
28,10
3,90
6,10
6,60
10,00
13,40
17,30
18,80
20,40
25,40
28,00
30,70
• Select the constant in relation to stem diameter and packing bolt size
• In order to obtain the packing bolt torque in Nm multiply the selected constant for pressure in
MPa
Example
Valve under pressure of 24 MPa with steam diameter equal to 44,5 mm and packing bolt size
equal to M16
a. Constant is equal to 4,9
b. Packing bolts torque is equal to
4,9 x 24 = 117,6 Nm
Table 3 – Suggested greases
Manufacturers
Suggested Greases for bearings
Agip
GRMUEP2
API
PGX2
BP
Grease LTX 2
Esso
Beacon 2
Fina
Finagrease HP Finagrease EPL2
Mobil
Mobilux EP2
Q8
Q8 Rembrandt EP2
Shell
Alvania R2 Supergrease A
Texaco
Multifak EP2 Grease L2
Total
Multis EP2 Multis 2
Viscol
Signal Rolsfer 2
Apply Molykote to the stem threads.
All other bolts and nuts are assembled with usual lubricant or Molykote.
Emerson reserves the right to change the contents without notice
page 7
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement