Pump Replacement 2.1 City personnel shall disconnect and remove existing pumps which will be replaced. City personnel shall set and connect each replacement pump at the electrical control disconnect. 2.2 Contractor shall deliver each replacement pump to the lift station locations. Crane equipment and service shall be provided by the City of Branson for unloading. 2.3 Contractor shall provide pricing of an exact or a later model replacement pump of the same brand or a city engineer approved equal meeting all electrical, pumping and operational requirements, for pump units supplied in this project. All compatible later model pumps of the same brand or approved equal shall be equipped with all required adaptors, components and appurtenances to allow for a complete and fully functional unit made ready for use with existing mounting brackets, guide rails, pump bases and electrical controls. 2.4 Pump specifications shall include at a minimum the following, or city engineer approved equal, components: 2.4.1 ASTM A-48, Class 35B cast iron motor housing with factory applied coating 2.4.2 All exposed nuts & bolts, Stainless Steel, AISI 304 2.4.3 All O-ring seals, Nitrile or Viton rubber, compressed on 2 sides and four sides of contact 2.4.4 Grommet type cable entry seals with strain relief 2.4.5 Separated cable and motor chambers with sealing gland(s) 2.4.6 NEMA B design induction type motor, inverter duty rated, NEMA MG1, Part 31 2.4.7 Air filled watertight motor chamber 2.4.8 Class H insulation, rated for 180 degrees C (356 degrees F) 2.4.9 Capable of 15 evenly spaced starts per hour 2.4.10 Thermal switches on each phase winding set to open at 125 degrees C (260 degrees F) 2.4.11 Stator chamber leakage detector 2.4.12 Resettable status/condition monitoring device connected to leakage detector and thermal switches for alarm and motor shut-down capabilities 2.4.13 480 Volt, 3 Phase, 60 Hertz 2.4.14 Convection cooled by surrounding environment for 14 HP or less, internally pumped and recirculated closed loop liquid cooling system for continuous operation up to 40 degrees C (104 degrees F) for 15 HP and above 2.4.15 Capability to operate non-submerged without damage 2.4.16 Continuous run power and control cables, no splices between pump and control panel, with stainless steel strain reliefs 2.4.17 Permanent grease lubricated motor bearings 2.4.18 Upper shaft bearing, deep groove, ball type 2.4.19 Lower shaft bearing, two row angular contact type 2.4.20 Tandem mechanical shaft seal system located between pump and motor housings, two independent seal assemblies and spring systems requiring no maintenance or adjustment for proper operation, each consisting of one rotating tungsten-carbide ring and one stationary tungsten-carbide ring. 15 HP and larger pumps shall have mechanisms to prevent pumped media from coming in contact with seal springs and designs to prevent abrasive particulates from entering the seal cavity 2.4.21 Seal lubricant chamber containing non-toxic lubricant to lubricate seal surfaces at constant rate independent of pumped media. 2.4.22 One-piece stainless-steel pump/motor shaft, ASTM A479 S43100-T 2.4.23 Hard-IronTM (ASTM A-532 (Alloy III A) Impeller, 25% chrome cast iron, leading edge hardened to Rc 60, dynamically balanced, semi-open, multi-vane, non-clog, capable of passing 3 inch solid, mechanically self-cleaning. 2.4.24 ASTM A-48, Class 35B single piece cast iron volute with Hard-iron TM (ASTM A-532 (Alloy III A) 25% chrome cast iron replaceable suction cover insert ring with spiral-shaped, sharp-edged grooves and guide pin to lessen risk of debris and trash buildup. 2.4.25 Machined metal pump discharge flange to allow watertight connection with pump base without the use of O-rings, seals or sealants. 2.4.26 Stainless steel lifting chains of adequate length to extend four (4) feet above wet well top 2.5 Pump and Motor Warranty: The contractor warrants that all materials shall be and shall remain free from defective workmanship or materials for a period of one (1) year from date of installation. In the event that a defect occurs within this warranty period, the contractor shall, at his sole expense, repair, replace or otherwise correct 100% of any such defective workmanship or materials. The Contractor shall provide a prorated warranty in years 2 – 5 following installation. Annual prorated percentage and any run-time hour limits shall be indicated on pricing page. Contractor shall not be liable for consequential damages and contractor's liability shall be limited to parts, supplies and labor costs for repair, replacement or correcting of defective workmanship or materials, including pick-up and delivery. Contractor shall have no responsibility with respect to workmanship or other defects caused by structural failure, or any other causes beyond the contractor’s control. 2.6 Prices must remain firm for a period of not less than two hundred forty (240) days from the date of closing.
