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33 32 17 Submersible Utility Wastewater Pumping Station

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33 32 17 Submersible Utility Wastewater Pumping Station 33 32 17 SUBMERSIBLE UTILITY WASTEWATER PUMPING STATION SECTION 1 - GENERAL 1.1 SUMMARY A. This Section specifies furnishing and installing a fully operational and complete submersible pump station as detailed on the drawings and specifications, including all labor, materials, site grading, structures, excavation, sheeting, backfill, reinforced concrete, masonry, carpentry, yard piping, equipment piping, miscellaneous piping, equipment, electrical work, controls, incidental painting, and all other items or material and work required to construct structures and furnish and install equipment for a complete installation. B. The intent and purpose of these specifications is to require a complete and satisfactory installation in every respect and any defects in material or workmanship shall be cause for the replacement and correction of such defect as directed by the Utility. 1.2 QUALITY ASSURANCE A. Wastewater pump stations shall be designed and permitted (at a minimum) in accordance with applicable State permitting requirements. B. Prior to construction of the facilities, the Contractor shall be responsible for coordinating all electrical work with local electric utility or Base Privatized Electrical provider. C. Electrical equipment, materials and workmanship shall comply with all applicable codes, safety and fire law regulations at the location of the work and shall conform to applicable codes and standards of the organizations listed below: 1. Utility requirements. 2. National Electrical Motors and Generators a. NEMA ICS2 Industrial Control Devices, Controllers and Accessories. b. NEMA MG1 Motors and Generators Standards listed above refer to the latest revision. 3. Submersible Wastewater Pump Association – SWPA Submersible Sewage Pumping Systems Handbook. 4. Department of Defense Unified Facilities Code – Sanitary and Industrial Wastewater Collection: Pumping Stations and Force Mains. DOD_UFC 3-240-08FA 5. National Electrical Code (NEC) American States Utility Services 33 32 17 - 1 Submersible Utility Wastewater Pumping Station Revision Date: 12/12/2018 D. All equipment and materials shall be new and shall bear the manufacturers name and trade name. E. In cases where the standard has been established for the particular material, the material shall be so labeled. F. The equipment to be furnished shall essentially be the standard product of a manufacturer regularly engaged in the production of the required type of equipment for this type of work and shall be the manufacturers latest approved design. G. Equipment and material shall be suitably delivered and stored, and shall be readily accessible for inspection. All items subject to moisture damage shall be stored in dry spaces. All material and equipment shall be protected against dirt, dust, water and chemical or mechanical injury, vandalism and theft. 1.3 SUBMITTALS A. Product Data: Include rated capacities, operating characteristics, furnished specialties, and accessories. B. Shop drawings shall be provided for all fabrication and installation details for each packaged sewage pumping station. Equipment assemblies shall be detailed to indicate dimensions; shipping, installed, and operating weights; loads; required clearances; method of field assembly; components; electrical characteristics; and location and size of each field connection. C. Shop drawings and manufacturer’s product data shall be submitted to the Utility for the following items at a minimum: 1. Pumps 2. Wetwell 3. Generator 4. Drives 5. Valves 6. Controls 7. Rainhood 8. Valve Vault 9. Wiring Diagrams: Power, signal, and control wiring. 10. SCADA P&ID and wiring diagrams 11. SCADA equipment including RTU and antenna 12. All control panels and enclosures 13. Jib crane 14. Access Hatches 15. Wetwell 16. Valve vault sump pump 17. Paint and coatings to be used on the project American States Utility Services 33 32 17 - 2 Submersible Utility Wastewater Pumping Station Revision Date: 10/04/2019 D. Certificates of Compliance shall be submitted to the Utility for the following 1. Pumps 2. Drives 3. Controls E. Operating & Maintenance and Service Manuals 1. The Contractor shall furnish one digital copy on a USB Flash Drive of an Operating & Maintenance and Service manual covering all of the equipment furnished for the wastewater pumping station. 2. The manual shall contain complete descriptions of each item of equipment and a complete parts list showing factory parts numbers. It shall also contain complete operating and service instructions and shall be tabbed and indexed for easy use. Manuals shall be submitted within 60 days after final review of shop drawings. SECTION 2 – MATERIALS 2.1 GENERAL A. The Utility will consider a factory constructed pumping station in lieu of a site constructed pumping station. The factory constructed pumping station shall generally meet all of the requirements of the specifications including this Section 33 32 17 Submersible Utility Wastewater Pumping Station, the Electrical Sections – Division 26 of the specifications, Section 33 32 50 Emergency Generators and Backup Pumping Systems, and any other Section of the specification that is related to the Pumping Station construction. The contractor is solely responsible for determining that the proposed factory constructed pumping station is in conformance with all project requirements. The Utility may allow deviations from the project requirements if the contractor specifically requests deviations from the project requirements, and those deviations are specifically approved by the Utility. B. The contractor shall furnish, take possession of when delivered, and install the pumping station equipment where shown on the drawings, complete with all incidental and appurtenances required for a complete, finished and fully operational installation. C. All equipment components shall be adequately sized to carry all loads and stresses occurring during fabrication and erection and resulting from normal and emergency operation in the installation shown on the drawings and under the conditions specified and/or implied. American States Utility Services 33 32 17 - 3 Submersible Utility Wastewater Pumping Station Revision Date: 10/04/2019 2.2 SUBMERSIBLE PUMPS & MOTORS A. Pumps, motors, and controls shall be as specified herein and as indicated on the drawings: 1. Type: Vertical submersible centrifugal non-clog, typically 2 required (Duplex System). See plans to determine if more than 2 pumps are required. Grinder pumps may be acceptable for some installations as approved by the Utility or shown on the plans. 2. Capacity: Per Plan Data or attached Data Sheet 3. Minimum sphere size: 3-inch 4. Efficiency at design point: Per Plan Data or attached Data Sheet 5. NPSHr at design point: Per Plan Data or attached Data Sheet 6. Motor performance requirements: a. Motor horsepower: Per Plan Data or attached Data Sheet b. Motor speed: Per Plan Data or attached Data Sheet c. Nominal power supply: Per Plan Data or attached Data Sheet d. Maximum current: Per Plan Data or attached Data Sheet e. Minimum power factor at full load: Per Plan Data or attached Data Sheet f. Minimum efficiency at full load: Per Plan Data or attached Data Sheet g. Minimum service factor: 1.15 B. Submersible Pumps 1. Pumps shall be submersible, centrifugal non-clog capable of passing solids as specified with hydraulic sealing diaphragms, pump mounting plates and base elbows with bottom rail supports, stainless steel upper rail supports, stainless steel lifting cable and/or stainless steel chain, schedule 40 stainless steel guide rails, and stainless steel cable supports. 2. It is the intent of these specifications that the pumps, base plates, guide rails, hoisting cable and connections to the control system (including panel, starters and circuit breakers), be provided by the pump manufacturer as an integral system. 3. Pump housing shall be of heavy cast iron construction. American States Utility Services 33 32 17 - 4 Submersible Utility Wastewater Pumping Station Revision Date: 10/04/2019 4. All fasteners shall be minimum 304 or 304L stainless steel or Utility approved equal. 5. Each pump shall be capable of being hoisted vertically out of the wetwell, and returned to operation without requiring the operator to enter the wetwell. 6. No electrical splices shall be allowed inside the wetwell. 7. The impeller shall be of bronze, ductile iron, or other durable, corrosion- resistant approved material. The pump impeller shall be of semi-open non- clog design and shall have back vane(s) to prevent build up of solids behind the impeller. The impeller shall be rigidly fixed to the motor shaft with a key(s) or other approved fastener (so designed to prevent separation under rotational loading). 8. The motor shaft shall be stainless steel, supported by upper and lower bearings. The upper bearing shall be a self-lubricating ball bearing. The lower bearing shall be a sleeve bearing or double row ball bearing lubricated from an oil chamber. Shaft and bearing shall have sufficient section to withstand all rotational and axial loading to be reasonably expected under normal wastewater pumping situations. 9. The shaft shall be sealed from the volute with an oil-lubricated mechanical seal system. The oil chamber shall be equipped with a seal sensor system to detect any leakage around the seal system. Mechanical seal shall be tungsten carbide type, double mechanical seal. One replacement seal for each pump shall be furnished to the utility. 10. The motor chamber shall be suitably sealed from the other chambers of the pump and from the exterior to be entirely suitable for submerged operation. The motor chamber may either be of oil-filled or air-filled design. 11. Pumps shall be Xylem, Pentair or Utility approved equal. C. Motors 1. Pump motors shall be of the sealed submersible type meeting UL Class I, Group D, Division I - Explosion proof requirements. The maximum rpm of the motor shall be as noted on the drawings or shall be approved by the Utility. Motors shall meet NEMA thermal rating MGI - 12.42. All leads are to be epoxy sealed. 2. Motors used on variable frequency drives (VFDs) shall be rated for inverter duty applications and shall be specifically approved by the Utility.
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