SERIES 320 FRAME MOUNTED END SUCTION CENTRIFUGAL PUMPS PART I - GENERAL

SERIES 320 FRAME MOUNTED END SUCTION CENTRIFUGAL PUMPS  PART I - GENERAL
SERIES 320
FRAME MOUNTED END SUCTION CENTRIFUGAL PUMPS
PART I - GENERAL
1.01
DESCRIPTION
The Contractor shall furnish materials, equipment and labor to
furnish, install and test the pumping system complete with the pumps,
motors, mounting bases, piping, valves and appurtenances, as indicated
on the contract drawings and as herein specified.
1.02
INSTALLATION
The Contractor shall insure that the pumps and motors are
properly installed with no pipe strain transmitted to the pump casing.
1.03
RESPONSIBILITY
To assure a properly integrated and compatible system, all
equipment described in this section shall be furnished by the Pump
Manufacturer, who shall assume full responsibility for the proper
operation of the pumps and associated equipment.
1.04
SUPERVISION
The Contractor shall arrange for the Pump Manufacturer to
provide a factory-trained representative as required for the purpose of
supervising installation, start-up, final field acceptance testing, and
providing instruction to the owner's operating personnel in the proper
operation and maintenance of the equipment in this section.
1.05
REFERENCE STANDARDS
The work in this section is subject to the requirements of
applicable portions of the following standards:
Hydraulic Institute Standards
IEEE Standards
NEMA Standards
OSHA Rules and Regulations
PART II - PRODUCTS
2.01
GENERAL DESCRIPTION
The pumps shall be horizontal flexible-coupled end suction
pumps, Aurora Pump Model 324 or pre-approved equal. Pre-approval must
be obtained a minimum of ten days before bid date.
2.02
MATERIALS OF CONSTRUCTION
Casing........................Cast Iron (ASTM A48)
Impeller......................Bronze (ASTM B584)
Shaft.........................Stainless Steel (AISI 416)
Case Wear Ring................Bronze (ASTM B62)
Power Frame...................Cast Iron (ASTM A48)
2.03
CASING
The casing will be of the end suction design with threaded
suction inlet and threaded centerline discharge outlet. The casing
shall have tapped and plugged holes for priming and draining. The
casing bore shall be large enough to allow "back pullout" of the
impeller without disturbing the casing or suction and discharge
piping.(ACD) The casing shall be supported by a power frame.
2.04
IMPELLER
The impeller shall be of the enclosed type, vacuum cast in one
piece. It shall be finished all over, the exterior being turned and
the interior being finished smooth and cleaned of all burrs, trimmings,
and irregularities. The impeller shall be dynamically balanced. The
impeller will be keyed to the shaft, and fastened with a washer, gasket
and capscrew.
2.05
CASE WEARING RING
The pump casing shall be fitted with a case wear ring to
minimize abrasive and corrosive wear to the casing. The wear ring
shall be of the radial type, pressed fitted into the casing.
2.06
STUFFING BOX
The stuffing box shall be integrally cast with a motor mounting
bracket, and shall provide an adequate area for internal recirculation
of the pumped fluid around the sealing medium. A tapped and plugged
hole shall be provided for external flushing as required.
2.07
MECHANICAL SEAL
Shaft sealing shall be accomplished by means of a mechanical
seal with a Ni-Resist seat, carbon washer, Buna-N elastomers, and
stainless steel metal parts.
2.08
SHAFT
The impeller shall be direct-coupled to the power frame shaft.
The shaft shall be machined to provide a keyway, and drilled and tapped
to accept the impeller fastener. Stub shafts are not acceptable. The
outboard shaft extension shall be machined with a keyway to accept a
coupling to the driving unit.
2.09
POWER FRAME
The power frame shall house a single-row inboard regreaseable
ball bearing and single-row outboard regreaseable thrust bearing. Both
bearings shall be selected for a 3 year minimum life at maximum load.
The outboard bearing shall be locked in place by a retaining ring. The
inboard bearing shall not be locked in order to accommodate thermal
expansion of the shaft. Lubrication fittings shall be provided in a
convenient location. A bearing cartridge end cap shall be provided on
the outboard side of the power frame to allow inspection and
replacement of the thrust bearing without the need for disassembling
the power frame housing.
2.10
FOOT SUPPORT
The pump unit shall be supported from beneath the power frame by
a separately cast mounting foot.
2.11
BASEPLATE
The pump and motor shall be mounted on a groutable formed steel
baseplate or driprim baseplate with integral drip channels incorporated
on each side. Each channel shall include an NPT drain connection and
plug. The base shall be sufficiently rigid to support the pump and the
motor without the use of additional supports or members.
2.12
COUPLING
A flexible coupling shall be provided to connect the pump shaft
to the motor shaft. The coupling shall be of an all metal type with a
flexible rubber insert. The entire rotating coupling elements shall be
enclosed by a coupling guard.
2.13
MOTOR
The motor shall conform to the latest NEMA standards, and shall
have the following characteristics:
Enclosure..................Open Drip Proof/TEFC/X-Proof
Number of Phases...........Three
Cycles.....................60 Hz
Voltage....................230/460 volt
Speed......................3600 RPM
Horsepower.................? hp
Each motor shall have a sufficient horsepower rating to operate
the pump at any point on the pump's head-capacity curve without
overloading the nameplate horsepower rating of the motor regardless of
service factor. The motor shall have a service factor of 1.15. The
service factor is reserved for variations in voltage and frequency.
PART III - PERFORMANCE
3.01
CONDITIONS OF SERVICE
The following conditions of service shall be strictly adhered
to:
Number of Units........................?
Type of Drive..........................? (variable or
constant)
Discharge Size.........................1 in, minimum
Suction Size...........................1.25 in, minimum
Design Capacity........................ US gpm
Design Head............................ ft
Efficiency at Design................... %, minimum
Rotative Speed.........................3500 RPM, maximum
Shut-off Head..........................52.3 ft, minimum
Driver Horsepower......................0.764 hp, minimum
NPSHR at Design........................ ft, maximum
3.02
INSPECTION AND FACTORY TESTS
Each centrifugal pump furnished under these specifications shall
be tested at the factory to verify individual performance (VIP).
Certified copies of all test reports shall be submitted to the Engineer
for approval prior to shipment. Each unit shall be hydrostatically
tested in accordance with the Hydraulic Institute Standards.
3.03
INSTALLATION AND ACCEPTANCE TESTS
A.
The pumping units shall be installed in accordance with the
instructions of the manufacturer and as shown on the drawings by the
Contractor.
B.
Installation shall include furnishing the required oil and
grease for initial operation. The grades of oil and grease shall be in
accordance with the manufacturer's recommendations.
NOTES: Teflon is a registered trademark of E.I. DuPont.
Additional information is available from any Aurora Pump
authorized distributor.
Aurora Pump reserves the right to make revisions to its products
and their specifications without notice.
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