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CITY OF SANTA AMA <br />RFP NO.: 16-09Q <br />WATER WELL, PUMP AND MOTOR REPAIR SERVICES <br />1. Visually inspect coils and windings for excessive wear, signs of conductor overheating or fatigue <br />that possibly would not be apparent during an electrical test. <br />2. All stators shall be surge- tested with an electronic surge tester specifically designed to apply a <br />surge voltage stress test simultaneously between turns of a coil, between phases, from winding to <br />ground and to detect short-circuited turns in winding under test. Testing shall be per EASA,IEEE <br />6Z2, 112 and T2.3 standards. Infrared imaging shall be provided pre and post test., <br />d. Mechanical Fit <br />1. Measure the bearing bores, shells, housings and shaft journaIs using a micrometer. Shaft fits and <br />housing fits shall comply with AR100-2015. Machine work shalt be approved by the Engineer <br />beforebeing performed or machine work may not be paid for.. Bearing journals, seal surfaces and <br />bearing housing restoration shall be done by metalizing and machining or boring and sleeving. <br />Documentation of before and after measurements shall be made. <br />2. Replace bearings per manufacturer's specifications. All grease fittings, plugs, etc. shall be replaced <br />unless otherwise indicated by the Engineer. Bearings shall be properly lubricated and bearing oil <br />reservoirs shall drained for shipping and installation. The Contractor shall be responsible for filling <br />the bearing oil reservoir upon Installation. All equipment shall be tagged with Information as to <br />whether or not bearing oil reservoirs were filled and what type of lubricant was used. <br />e. Rotor Balancing <br />1. All rotors of motors rated at 50 HP/3600/1800 RPM and above shall be dynamically balanced, with <br />the rotor running at rated speed where practical but not less than 600 RPM In the balance stand. <br />The balancing speed shall also be rapid enough so the balance machine sensitivity can reliably <br />measure the maximum allowable residual unbalance, <br />2. A printout tape from the balance/analyzer shall be furnished detailing the final balance values. This <br />tape will be attached to the recondition/repair/rewind documents when the motor Is delivered. <br />f. Motor Leads <br />Motor leads shall be e permanently tagged with nonmagnetic markers, Motor lead configuration shall <br />not be altered. <br />g: Insulation <br />I. Windings shall be double -dipped with. Glass H varnish and baked. <br />2, Machine -finished surfaces bore of the stator lamination and periphery of the rotor laminations shall <br />be cleaned of all varnish and foreign materials. Photo documentation of this process shall be made <br />prior to and after lamination. <br />h. Final Test <br />1, A 1000 volt meg-ohm meter shall be used to verify insulation continuity. This reading shall be <br />documented, After reassembly, motor shall be test -run at rated voltage and frequency, No load <br />voltage and phase currents shall be recorded. Vibration mils displacement shall be measured, and <br />recorded in the horizontal, vertical and axial planes on both ends of the motor, or top and bottom of <br />vertical motors and documentation of current reading and vibration readings shall be provided to the <br />Engineer. <br />2. A 5KV meg-ohm meter shall be used to verify Insulation continuity of all 4160V motors.. <br />i. Paint <br />1, Exterior of motor shall be properly cleaned of rust and foreign material, prime painted and finish <br />painted with a good grade of machinery enamel, the same color as received unless otherwise <br />specified. Nameplates, machined surfaces and internal parts shall be protected from paint. <br />251 <br />