25C - AGMT - WATER PUMP REHAB SRVS

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CITY OF SANTA ANA RFP NO.: 16-090 w2vrER WELL, PUMP AND 'tNIOTOR REPAIR SERVICES 1. Visually Inspect coils and windings for excessive wear, signs of conductor overheating or fatigue that possibly would not be apparent during an electrical test. 2. All stators shall be surge- tested with an electronic surge tester specifically designed to apply a surge voltage stress test simultaneously between turns of a coil, between phases, from winding to ground and to detect short-circuited turns in winding under test. Testing shall be per EASAJEEE 612:2, 11.2 and 7.2.3 standards, Infrared imaging shall be provided pre and post test, d.. Mechanical Fit 1. Measure the bearing bores, shells, housings and shaft journals using a micrometer. Shaft fits and housing fits shall cornply with AR100-2015, Machine work shall be approved by the Engineer before being performed or machine work may not be paid for,. Bearing journals, seal surfaces and bearing housing restoration shall be done by metalizing and machining or boring and sleeving. Documentation of before and after measurements shall be made. 2. Repiace bearings per manufacturer's specifications. All grease fittings, plugs, eta shall be replaced unless otherwise indicated by the Engineer. Bearings shall be properly lubricated and bearing oil reservoirs shall drained for shipping and installation. The Contractor shall be responsible for filling the bearing oil reservoir upon installation. All equlpment shall be tagged with Information as to whether or not bearing oil reservoirs were filled and what type of lubricant was used. e. Rotor Balancing 1, All rotors of motors rated at 50 HP/3600/1800 RPM and above shall be dynamically balanced,, with the rotor running at rated speed where practical, but not less than 6170 RPM In the balance stand. The balancing speed shall also be rapid enough so the balance machine sensitivity can reliably measure the maximum allowable residual unbalance. 2. A printout tape from the bafance(analyzer shall be furnished detailing the final balance values. This tape will be attached to the reconditfon/repair/rewind documents when the motor is delivered. f. Motor Leads Motor leads shall be permanently tagged with non-magnetic markers, Motor lead configuration shall not be altered. g. Insulation 1, Windings shall, be double -dipped with Class H varnish and Naked. 2. Machine -finished surfaces bore of the stator lamination and periphery of, the rotor laminations shall be cleaned of varnish and foreign materials. Photo documentation of this process shall be made prior to and after lamination. h. Final Test 1. A 1000 volt meg-ohm meter shall be used to verify insulation continuity, This reading shall be documented. After reassembly, motor shaft be test -run at rated voltage and frequency. No load voltage and phase currents shall be recorded. Vibration mils displacement shall be measured and recorded in the horizontal, vertical and axial planes on both ends of the motor, or top and bottom of vertical motors and documentation of current reading and vibration readings shall be provided to the Engineer. 2. A 5KV meg-ohm meter shall be used to verify insulation continuity of all 41.60V motors. i. Paint 1. Exterior of motor shall be properly cleaned of rust and foreign material, prime painted and finish painted with a good grade of machinery enamel, the same color as received unless otherwise specified. Nameplates, machined surfaces and internal parts shall be protected from paint. 25C-14