SUGGESTED SPECIFICATIONS

Transcription

1 SUGGESTED SPECIFICATIONS SERIES 3000 SUSPENDED, SCREENED WET-PIT PUMPS PART 1 GENERAL 1.1 DESCRIPTION Work Included: Under this section, the contractor shall provide all labor, equipment and material necessary to furnish, install, test and place in operation Vertically Suspended Wet-Pit Drainage Pumping Unit(s) designed for wastewater service as shown in the plans and as specified herein. Other Project Specific Work 1.2 Related Work Described Elsewhere: Project Specific 1.3 GENERAL Furnish and install Vertically Suspended Wet-Pit Drainage Pumping Unit(s) complete with all accessories and appurtenances as shown in the plans and specified herein or as required for a complete operating system. Each pumping unit shall be rated for the duty in accordance with the operating conditions defined in Table 1 of these specifications. Each unit shall be furnished complete with pump, bearing support, suspension column, suspension plate, discharge pipe, motor, motor support and flexible coupling as described herein. 1.4 QUALITY ASSURANCE Qualifications of Manufacturers: The pump(s) shown and specified are based on the products manufactured by Yeomans Pump, Aurora, Illinois. Model numbers and references are given only as an indication of the quality of materials and workmanship to be used. Pump(s) are to be engineered and manufactured under a written Quality Assurance program. The Quality Assurance program is to have been in effect for at least five (5) years and shall include a written record of periodic internal and external audits to confirm compliance with such program. 1.5 QUALITY CONTROL The Pumping Unit(s) shall conform to all applicable requirements of the Hydraulic Institute. For purposes of this specification, the revision and/or version of the referenced standards in effect on the date of public bid shall apply. The Vertically Suspended Wet-Pit Drainage Pumping Unit(s) specified shall be the products of reputable manufacturers who have been regularly engaged in the design, manufacture and furnishing of Wastewater Pumping Equipment for at least ten (10) years. The manufacturer of the pump shall assume full responsibility for compatibility of the supplied components with the application. ISSUE 2/05 PAGE 3061

2 SUGGESTED SPECIFICATIONS PART 2 PUMP CONSTRUCTION 2.1 GENERAL Note: Delete reference to wastewater if not applicable and insert the fluid type. The pump casing shall be designed for handling (wastewater) and shall be of cast iron conforming to ASTM A48, Class 30 or better, of sufficient thickness and suitably ribbed to withstand all stresses and strains of service at full operating pressure. The pump casing shall be of the volute type and shall be suspended from a 1/2 inch minimum thickness hot rolled steel suspension plate. Each pump shall be fitted with a cast iron suction inlet screen. 2.2 SUCTION SCREEN A cast iron suction screen, permitting solids no larger than those capable of passing through the impeller, shall be firmly fastened to the pump suction. The screen openings shall not constrict the flow. The sum of the area shall allow free flow through the suction of 125% of the maximum capacity of the pump. 2.3 IMPELLER The impeller shall be a balanced non-clogging type made of close-grained cast iron conforming to ASTM A48 Class 30 or better. The impeller shall be single suction, open, semi-open or enclosed; multi-vane, radial flow design with well rounded leading vanes and then tapered toward the trailing edge for a circular flow pattern. The waterways through the impeller shall have extremely smooth contours devoid of sharp corners. The impeller shall be cast in one piece and shall be dynamically balanced. The impeller shall be of the Yeomans Lubri-Vac design to provide integral vacuum assistance to the lower bearing lubrication and shall include back-vanes to force solids and grit away from the lower pump bearing area. The impeller shall be keyed to the shaft and firmly held in place by a streamlined 316 stainless steel or bronze locking device. The arrangement shall be such that the impeller cannot be loosened by torque from either forward or reverse rotation. 2.4 SHAFT The pump shaft shall be made of: Standard: alloy steel, type AISI 1045 turned, ground and polished and shall be sized as indicated on Table 1. Optional: type 316 stainless steel, ASTM A276-80a material. PAGE 3062 ISSUE 2/05

3 SUSPENDED, SCREENED WET-PIT PUMPS 2.5 MOTOR SUPPORT / BEARING FRAME / STUFFING BOX The pump shall include a combination motor support, bearing housing and stuffing box made of iron casting(s), type ASTM A48 Class 30 material. This structure shall provide rigged motor support and shall be machined for standard C-face mounting solid-shaft NEMA frame vertical motors. Ample space shall be provided for installation and removal of the motor coupling. This structure shall also provide the support and alignment of the pump thrust bearing. The thrust bearing shall be of the heavy-duty steel ball type and shall be grease lubricated. The thrust bearing location shall be located a minimum of 6 to 9 inches above the pump suspension plate to help prevent bearing contamination from washdown water or flooding. A micrometer adjusting collar shall be provided just above the thrust bearing housing to permit axial movement of the pump rotating element for adjustment of the impeller clearance to maintain pump efficiency and reduce operating costs. The stuffing box shall include a solid one-piece bronze gland and shall be fitted with synthetic, self-lubricating packing to help prevent the upward migration of noxious gases or foul odors. The motor support and stuffing box shall be indexed into the pump suspension plate for positive alignment. 2.6 COLUMN AND DISCHARGE PIPES The pump shaft shall be enclosed in a suspension pipe. A separate discharge pipe shall also be included. All pipe construction is to be of Schedule 40 wrought steel with screwed on flanges and machined true for a positive tongue and groove connected fit. Use of welded flanges or doweled alignment methods is strictly prohibited. A 45 deg. flanged cast iron elbow shall be provided above the suspension plate for piping connection. Optional: For Two-Section Pump Construction ADD the following: Each pump shall be manufactured and shipped in two (2) sections. The section split shall be located at the nominal mid-point between the pump suspension plate and the volute casing. Flange connections for the column and discharge pipes shall be included at the section break. Suitable couplings shall be included for the shaft and lubrication lines. ISSUE 2/05 PAGE 3063

4 SUGGESTED SPECIFICATIONS 2.7 PUMP AND INTERMEDIATE SLEEVE BEARINGS AND LUBRICATION SYSTEMS A renewable sleeve-type pump bearing shall be furnished directly above the pump casing. For pit-depths over 6-0, renewable sleeve-type intermediate bearings shall also be furnished. Spacing between all sleeve bearings shall not exceed 4-9. The sleeve bearings are to be a minimum of 3 in length and shall have a wall-thickness of 3/8 minimum. The sleeve bearings shall be of the (insert bearing material type from chart below) type. All sleeve bearings shall be fitted with a lubrication system appropriate for the specified bearing material. The lubrication system shall consist of (insert text for the desired system based upon the bearing material and lubrication system descriptions listed below). Sleeve Bearing Materials Lubrication Systems Standard Optional Standard: bronze backed babbit lined L-1A L-2A,L-1B,L-2C or L-6 ( B.B.B.L. ) Option A: solid bronze L-1A L-6 Option B: solid block carbon/graphite L-4 or L-5 n/a Option C: bronze graphite plugged L-4 or L-5 n/a Option D: glass impregnated Teflon* L-4 or L-5 n/a Option E: bronze backed rubber* L-4 or L-5 n/a Option F: stainless steel backed rubber* L-4 or L-5 n/a Option G: modified graphite* L-4 or L-5 n/a * These types require stainless steel shaft. See paragraph 2.3 above. Lubrication System Descriptions (select one only) (L-1A) individual grease lubrication lines to each sleeve bearing, including Alemite grease fittings located on top of the pump suspension plate. (L-2A) individual oil lubrication lines to each sleeve bearing, including a manual oiler/ reservoir with individual divider valves, mounted on the motor support/thrust bearing housing. (L-2C) individual oil lubrication lines to each sleeve bearing, including a solenoid operated oiler/reservoir with individual divider valves, mounted on the motor support/thrust bearing housing. The solenoid shall be rated for volts phase, HZ electrical service. (L-4) cross-connection piping between the discharge and column pipes for bearing lubrication by the pumped liquid. PAGE 3064 ISSUE 2/05

5 SUSPENDED, SCREENED WET-PIT PUMPS (L-5) individual water lubrication lines to each sleeve bearing, including water pipe connection located on top of the pump suspension plate, to facilitate connection by the contractor of an external clear water source. (L-6) individual grease lubrication lines to each sleeve bearing, including individual pressurized grease cups located on top of the pump suspension plate. 2.8 COUPLING Each pump shall be provided with a standard jaw-type, flexible, non-lubricated coupling. Optional: For coupling guard ADD the following: An OSHA approved coupling guard shall also be included. PART 3 MOTOR Each pump shall be furnished with a vertical C-face solid shaft squirrel cage induction electric motor with a maximum horsepower and speed as specified. The motor shall have a (ODP) (TEFC) (TEXP) enclosure and shall meet all the requirements of NEMA, IEEE and NEC. Motors shall be rated for volts, phase, hertz electrical service and shall conform to all applicable requirements of Div. 16. PART 4 TESTING The pumps shall be performance tested at the manufacturer s plant before shipment in accordance with Hydraulic Institute standards. Upon request, certified copies of the test curves shall be submitted to the engineer. PART 5 FIELD SERVICE Days of Field Service shall be provided by an authorized, factory trained representative of the Pump Manufacturer. Services shall include, but not necessarily be limited to, inspection of the completed installation of the supplied equipment to ensure that it has been installed in accordance with the manufacturer s instructions and recommendations, supervision of all field testing and activation of the Manufacturer s Prescribed Warranty. The Contractor shall be responsible for coordinating the required field services with the Pump Manufacturer. END OF SECTION ISSUE 2/05 PAGE 3065

6 SUGGESTED SPECIFICATIONS TABLE 1 PERFORMANCE DATA Pit Depth. Rate of Flow at Duty Point (USGPM) Total Dynamic Head at Duty Point (Ft) Minimum TDH at 0 GPM Flow at secondary duty point... TDH at secondary duty point... Minimum Spherical Diameter Solids Passage (In).. Minimum Pump Shaft Diameter (In.) Minimum Motor HP Maximum Motor Speed (RPM)... Electrical Power... Voltage Phase Hertz PAGE 3066 ISSUE 2/05