- No category
advertisement
▼
Scroll to page 2
of 4
SERIES 340 HORIZONTAL CLOSE COUPLED 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 pump shall be a centrifugal horizontal close-coupled end suction pump, Aurora Pump Model 341 or pre-approved equal. Preapproval 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.........................Steel (AISI C1045) Case Wear Ring................Bronze (ASTM B62) Shaft Sleeve..................Bronze (ASTM B62) 2.03 CASING The casing will be of the end suction design with tangential discharge outlet. For suction piping diameters of 2" or less and discharge piping diameters of 1.5" or less, the suction and discharge connections shall be NPT threaded. For suction piping diameters of 2" or greater, the suction inlet shall be a flat-faced flange connection and the discharge outlet shall be a bolt through flange connection. Flange connections shall be ANSI 125# rated. 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. The casing shall be supported by the driving unit. 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 case wear ring shall be of the radial type, press fitted into the casing. 2.06 STUFFING BOX The stuffing box shall be integrally cast with a mounting bracket, and shall provide an adequate area for internal recirculation of the pumped fluid around the sealing medium. 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 motor shaft. The motor shaft shall be machined to provide a keyway, and drilled and tapped to accept the impeller fastener. Stub shafts are not acceptable. 2.09 SHAFT SLEEVE The pump shaft shall be fitted with a shaft sleeve to minimize shaft wear.The sleeve shall be sealed to the impeller hub by an O-ring, and shall be positively driven by a pin to the keyway. The use of adhesive compounds to fasten the sleeve to the shaft shall not be accepted. 2.10 MOTOR The motor shall be a NEMA-JM configuration in accordance with the latest NEMA Standards, and shall have the following characteristics: Enclosure.......................Open Drip Proof/TEFC/X-Proof Number of Phases................Three Cycles..........................60 Hz. Voltages........................230/460 Volt Speed...........................3600 RPM 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 at least 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......................1.25 in, minimum Suction Size........................1.5 in, minimum Design Capacity..................... US gpm Design Head......................... ft Efficiency at Design................ %, minimum Rotative Speed......................3500 RPM, maximum Shut-off Head.......................210 ft, minimum Drive Horsepower....................10.2 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.
advertisement
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project