Laserfiche WebLink
CITY OF SANTA ANA <br />RFP ~IO,; 16-090 <br />WATER WELL, PUMP AND MOTOR REPAIR SERVICES <br />2. When needed, the interiors of motor frames and parts shall be painted with an insulating paint, This. <br />Includes rotors, bearing brackets, frame interiors and air deflectors. Windings shall Pot .b.e painted. <br />Incidentals <br />1. In the event that the motor is in poor condition and cannot be repaired, reconditioned or made as <br />new, the Contractor shall notify the Engineer Immediately, <br />2. All incidental parts requiring replacement; such as bearings, coils, etc. shall be considered included. <br />in other items of bid and no additional compensation shall be allowed. <br />7. REWINDING OF ELECTRIC MOTORS <br />When rewinding is done in conjunction with a recondition or repair, many of the items below will be <br />redundant and shall not be performed or charged for twice. The items below apply to stator only (including <br />all labor, materials and testing necessary for work completion) and shall at a minimum include: <br />a. Pre -Disassembly Test <br />1, Using a 1.000 meg-ohm meter, conduct verification for insulation integrity. Acceptable criteria is 1.5 <br />meg-ohms or higher.. <br />2. A 5KV meg-ohm meter shall be used to verify insulation integrity of all 4160V motors.. <br />3. Verify that heaters are operational and other attached features such as thermocouples have <br />continuity. <br />4. Pre -disassembly documentation shall include the condition of mechanical fits (i.e.. shaft run out), <br />cracked, broken or missing parts, test run at full voltage, current readings, meg reading and surge <br />comparison test as received. The Engineer shall be notified. if acceptable criteria are not met. <br />b. Stripping <br />1. Windings shalt be removed byt4mperature-controlled burnout with: oven temperafture suppression. <br />Burn -out temperature,.shall not exceed 750 degrees Fahrenheit. <br />2. Windings shall be removed In such a fashion not to damage or distort the core Iron, Upon removal <br />of the old windings and insulation, the core shall be thoroughly cleaned and inspected for burrs, etc. <br />3. After the burnout procedure, the Contractor shall perform a stator core loss test to ensure the stator <br />larni'nations are not heat damaged,. If the stator core losses exceed four (4) Watts per poured of core <br />steel, notify the Engineer prorto proceeding forward. <br />o. Winding <br />1. General: Rewound motors shall meet or exceed all O.E.M. operating characteristics, unless <br />otherwise specified by the Engineer, NEMA Class F insulation shall be used, unless otherwise <br />specified. Magnet wire shall be. a Quad Build, insulated and <br />of domestic manufacture that meets or <br />exceeds NEMA specification MW -35A. After winding and prior to resin treatment, windings will <br />be surge -comparison tested and the results documented. <br />2. The copper cross-sectional area shall be at least as large as the original winding. <br />3.. Resin Treatment: Windings shall be double -dipped with Class H varnish and baked. <br />4. Check all coils for overall cull shape. Perform a high frequency tum -to -tum dielectric test (surge <br />test) in accordance with. IEEE 522. Submit test results to the City, This shall be done prior to <br />installation into the stator. <br />d. Motor Leads: Motor lead's that are replaced must be the same length and configuration as the original <br />leads. Leads will be permanently tagged with non-magnetic markers. Lead lengths shall be identified <br />by the City when a request for service is made. <br />25C-57 <br />