SUGGESTED SPECIFICATIONS
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1 PART 1 - GENERAL 1.01 SCOPE A. Pumps to be supplied under this specification shall be of a severe duty, recessed cupped impeller design suitable for use in (SLUDGE, GRIT, ETC. APPLICATIONS) with a 20 year performance life. The pump liquid end (Suction Cover, Casing, Impeller & Rear Liner) shall be provided with a guarantee against mechanical failure due to materials and workmanship or abrasive wear under the original specified operating conditions. The guarantee shall be for municipal installations and shall include the replacement of the part for 5 years from the date of shipment. The liquid end guarantee shall be provided in certificate form, signed by an officer of the manufacturing corporation, and listed in the submittal. Units will be horizontal (A: SIDE-BY-SIDE, B: OVERHEAD MOTOR MOUNTED, C: Z-BASE) V-Belt drive configuration having a wet end construction of 28% chrome iron with a 420SS shaft sleeve and cast iron stuffing box. The power end will be cast iron (OIL or GREASE) lubricated with bearings rated for a minimum of 100,000 hours B- 10. All equipment shall be suitable for the application and in compliance with these specifications. B. The required units shall be Morris Pumps Model 6100CT or a pre-approved equal QUALITY ASSURANCE A. The equipment covered by this specification is intended to be a standard product of proven reliability as manufactured by Morris Pumps, Aurora, IL or pre-approved equal and having at least twenty (20) years of experience in the production of such equipment and five (5) years successful field operation of the actual proposed equipment. All units specified in this specification shall be supplied by a single pump manufacturer. Pumps are to be engineered and manufactured under a written Quality Assurance program certified to the ISO 9001:2000 Quality System Standard. 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 ISO 9001:2000 requirements. (OPTION: In addition to the pumps the pump manufacturer shall supply the motors and drives and take responsibility for the components within their scope of supply). B. Pumps shall conform to these specifications and the Hydraulic Institute Standards (latest edition). (Option: The pump manufacturer shall supply a certificate of conformance at time of shipment. A copy will be included with the shipment to confirm that the pumps supplied meet the required specifications.) C. All pumps shall be given a performance test in accordance with the Hydraulic Institute Standards (latest edition) as required by the specifications. PART 2 - PRODUCT SELECTION 2.01 OPERATING SELECTION A. The pump shall be designed for continuous operation and operate at/or below the vibration levels listed in the Hydraulic Institute Standards (latest edition). The number of starts for a 24-hour period shall not exceed that as limited by the driver manufacturer. B. The pump operating and service conditions shall be as listed on the attached TABLE 1 - PERFORMANCE DATA. The Rated Condition as listed in TABLE 1 - PERFORMANCE DATA shall be the rated condition as defined by the Hydraulic Institute Standards. This condition will be used for any performance evaluation. Other Rated Conditions must be within 5% of the values and are furnished to describe the full range of the operating requirements. Date 10/1/07 PAGE
2 PART 3 - PRODUCT DESIGN 3.01 The pump shall have a continuously rising head capacity curve from runout to shutoff. The pump shall be designed to operate continuously for an extended period of time at any point in the specified operating range of the curve without cavitation, overheating or excessive vibration. The motor nameplate horsepower rating shall not be exceeded by the pump brake horsepower requirements at any point of the specified operating range. PART 4 - MATERIALS OF CONSTRUCTION 4.01 The recessed cupped impeller pump shall conform to the materials of construction as listed for this design MATERIALS PUMP COMPONENT CASING IMPELLER SUCTION COVER REAR LINER STFG. BOX COVER IMPELLER BOLT SHAFT SLEEVE SHAFT LANTERN RING PACKING STFG. BOX GLAND BEARING FRAME MATERIAL Cast Iron ASTM A48, Cl Stainless Steel 420SS ASTM A743, Grade CA-40 with a min. hardness of 450 BHN Steel, AISI 1045 H.R. Teflon Square Braid Graphite Polymer Fiber 316SS ASTM A743, Gr. CF-8M Cast Iron ASTM A48,Cl. 35B 4.03 CASING CONSTRUCTION A. The pump casing shall be reversible for RH or LH rotation without the need for changing the impeller or casing and shall be of sufficient strength and metal thickness to insure long life, accurate alignment and reliable operation. The volute of the pump casing shall have smooth fluid passages large enough at all points to pass any size solid which can pass through the discharge and provide smooth unobstructed flow. The casing shall have a separate and removable suction cover, rear liner and stuffing box cover. B. The discharge flange shall conform to ANSI B16.1, Class 125 lb., flat face, of standard size with drilled holes. C. The casing shall have machined registered fits to minimize localized wear, assure proper alignment of the suction cover and rear liner and will be sealed by isolated Buna-N O-Rings. The clearance between the registered fits shall be no greater than.025". An undercut of no more than.050" shall be provided for ease of maintenance. Ground nontoleranced tapered fits which increase eddy currents and promote localized wear will not be accepted. D. The casing shall have a minimum thickness as shown below to provide for maximum wear allowance. 2" PUMPS.75" 3" PUMPS.75" 4" PUMPS.88" 6" PUMPS 1.00" 8" PUMPS 1.12" PAGE Date 10/1/07
3 4.04 IMPELLER CONSTRUCTION A. The impeller shall be of the single suction vortex design recessed into the rear wear liner and out of the flow path. The impeller shall be of a cupped shape with the impeller shroud fully encasing the tips of the impeller vanes preventing direct impingement of the pumpage on the wear liner or casing resulting in localized wear. Radial discharging impellers will not be accepted. B. The shroud of the impeller shall incorporate pump out vanes for the purpose of maintaining a solids free area behind the impeller to decrease wear and extend the life of the stuffing box seal. C. The impeller shall be straight bored and keyed to the pump shaft. The impeller shall be held in place by a recessed 18-8 SS impeller bolt and will be sealed front and back with Buna-N O-rings to provide a dry shaft design. The impeller bore shall be directly through the homogeneous impeller material. The use of soft metal casting inserts which could break loose due to torque and fatigue associated with starting and stopping will not be accepted. D. The cupped impeller shall be capable of being easily removed and remounted on the pump shaft without the use of special procedures to confirm impeller bore engagement. Designs which do not utilize a machined keyway for torque transfer shall not be acceptable. E. Due to the size, shape and weight of the cupped impeller design. A special tool shall be provided to assist with handling the impeller during maintenance. F. The impeller shall provide the same hydraulic performance regardless of rotation SUCTION COVER CONSTRUCTION A. The suction cover shall have machined registered fits to minimize localized wear, assure proper alignment of the suction cover and rear liner and be sealed by isolated Buna-N O-Rings. The clearance between the registered fits shall be no greater than.025". An undercut of no more than.050" shall be provided for ease of maintenance. Ground non-toleranced tapered fits which increase eddy currents and promote localized wear will not be accepted. The purpose of the machined fit is to prevent localized wear due to loose tolerances, simplify removal and replacement, and to assure proper fit and alignment. B. The suction flange shall conform to ANSI B16.1, Class 125 lb., flat face, of standard size with drilled holes. The suction cover shall have a minimum thickness as shown below to provide for maximum wear allowance. 2" PUMPS.88" 3" PUMPS 1.00" 4" PUMPS 1.25" 6" PUMPS 1.25" 8" PUMPS 1.50" 4.06 REAR LINER A. The rear liner shall have machined registered fits to minimize localized wear, assure proper alignment of the suction cover and rear liner and be sealed by isolated Buna-N O-Rings. The clearance between the registered fits shall be no greater than.025". An undercut of no more than.050" shall be provided for ease of maintenance. Ground non-toleranced tapered fits which increase eddy currents and promote localized wear will not be accepted. The purpose of the machined fit is to prevent localized wear due to loose tolerances, simplify removal and replacement, and to assure proper fit and alignment. B. The rear liner shall have a bolt circle of tapped holes for attachment to the bearing frame. The bolt circle shall be drilled and tapped directly into the homogeneous rear liner material. The use of soft metal casting inserts which could break loose due to torque during bolt tightening will not be accepted. Date 10/1/07 PAGE
4 4.07 STUFFING BOX COVER A. The stuffing box cover shall be clamped between the rear liner and the bearing frame and will be provided with machined registered fits to assure true alignment with the pump shaft. B. The stuffing box shall be suitable for either packing or mechanical seals. The stuffing box will be provided with two 3/8" NPT flush taps for piping arrangement flexibility and shall have a 4 bolt gland pattern. C. The packed stuffing box shall be provided with 5 rows of packing, a Teflon lantern ring, a 316SS split gland and 316SS gland hardware. D. A taperbore stuffing box shall be available as an option for use with single mechanical seals on abrasive services. E. Ample room shall be provided for maintenance of the stuffing box. As a minimum the distance from the face of the stuffing box to the first obstruction shall be 3" SHAFT SLEEVE A. The shaft sleeve shall be of a hook style design and will extend from the impeller past the face of the stuffing box. The sleeve shall be sealed against the impeller with an O-Ring to provide a dry shaft design. Sleeve designs that do not fully protect the shaft against the corrosive and abrasive effects of the pumpage will not be accepted. B. The sleeve shall be keyed to the shaft to prevent rotation relative to the shaft SHAFT A. The shaft shall be high strength, accurately machined and of sufficient size, with liberal safety factor, to transmit the maximum horsepower and loading from the impeller to the bearings when the pump is operating at the maximum allowable speed. B. The pump shaft shall be designed such that the maximum shaft deflection shall not exceed.002"at the stuffing box BEARING FRAME A. The bearing frame shall be a one piece rigid cast iron construction, providing a self centering and self indexing fit with the rear liner and stuffing box cover of the pump to insure proper alignment. B. The bearing frame shall be designed with an integral stuffing box drainage collection chamber with a drilled and tapped 3/4" NPT drain. C. The bearing frame shall be designed so that the complete rotating assembly can be removed without disturbing the suction and discharge piping. D. The bearing frame inboard and outboard end covers shall be equipped with lip type grease seals and deflectors to prevent the entrance of contaminants. (Option: Non-contacting labyrinth seals shall be available.) E. The bearing frame shall be provided with oil bath lubricated inboard and outboard single row tapered roller bearings both designed to handle radial and thrust loads. The bearings shall provide a minimum B-10 life of 100,000 hours at any point on the operating performance curve. F. Bearings shall be available for grease lubrication. PAGE Date 10/1/07
5 4.11 PUMP MOUNTING A. The pump shall be provided with a common base of sufficient size to accommodate the pump, driver and V-Belt drive or coupling. The base shall be (A: SIDE-BY-SIDE, B: OVERHEAD MOTOR MOUNTED, C: Z-BASE). The base shall be of sufficient strength to support all loads to which it may be subjected. If the specifications define a future size drive system, the sub-base shall be sized and machined for the present and future drive system. The subbase may use removable or adjustable spacers to accommodate the initial and future drive system. C. The pump manufacturer shall indicate on the certified pump outline drawing the location of the anchor bolts required for the attachment of the pump sub-base to the concrete support base. The anchor bolts shall be supplied by the installation contractor and positioned prior to concrete placement with embedment determined by the Engineer V-BELT DRIVE V-Belt drives shall be selected with a minimum of a 1.3 service factor over the nameplate rated horsepower of the driver. Drives shall have variable pitch or single pitch sheaves. If single pitch drives are provided, two additional sheaves shall be supplied to provide a speed range of 20 to 30 RPM above and below the rated pump RPM using a common set of belts GUARDS All drives shall be provided with fabricated guards of adequate size and designed to be in compliance with OSHA safety standards. Guards shall have hinged access ports for verifying the pump and motor RPM. PART 5 - DRIVER The required pump driver shall be supplied in accordance with specification The driver shall be selected to be non-overloading over the specified pumping head range. PART 6 - FACTORY TESTING Testing shall be (A: NON WITNESSED / B: WITNESSED) All hydro and performance testing shall be completed prior to the application of any final paint and/or coating. All factory testing shall be in accordance with the standards of the Hydraulic Institute (latest edition). All testing is to be performed at the manufacturer's facility using lab personnel, instrumentation and drives Written approval of all testing will be required prior to release to shipment Hydrostatic testing shall be performed on the assembled pump with the liquid end components being held at a pressure of 150 PSI, but not greater than the allowable mechanical seal pressure, for a period of not less than (A: FIVE MINUTES / B: THIRTY MINUTES). A hydro test certification shall be completed after the test and included in the final data package Performance testing shall include head, capacity and power readings at eight (8) points including the rated point, to determine the actual pump performance and efficiency. Performance testing shall establish that the pump is free of overheating, cavitation and excessive vibration over the specified conditions. A certified performance curve shall be completed after the test and included in the final data package A ten day notice shall be given to the engineer prior to the start of any witness testing Field functional testing will be performed to insure proper mechanical operation at the job site. All testing to be used for performance evaluation shall be performed at the pump manufacturer's facility Motor tests and test reports shall be provided as required in accordance with specification as stated in part 5. Date 10/1/07 PAGE
6 TABLE 1 - PERFORMANCE DATA Pump Item Number... Number of units required... Rated Duty Point Condition Capacity (Flow)... GPM TDH (Total Dynamic Head)... Feet Minimum Efficiency... % (Alternate) Condition "B" Capacity (Flow)... GPM TDH (Total Dynamic Head)... Feet Minimum Efficiency... % (Alternate) Condition "C" Capacity (Flow)... GPM TDH (Total Dynamic Head)... Feet Minimum Efficiency... % Minimum Shutoff Head... Feet Minimum motor horsepower required... HP Electrical Characteristics Required... Volt Hz. Ph. Maximum pump operating speed... RPM Minimum Suction Size... inches Minimum Discharge Size... inches Minimum Solid Size required to pass through Impeller... inches diameter Maximum NPSH Required... Feet Minimum NPSH Available... Feet Liquid to be Pumped... Pumping Temperature... F Specific Pumping Temperature... PAGE Date 10/1/07
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