AC Motor Repair_Rev1

Page 1 of 3 STATEMENT OF WORK 1. SCOPE 1.1. Title: Statement of Work for the repair of the AC Motor identified in section 1.3. 1.2. Location of Work: Work to be performed at Contractor’s facility. 1.3. Identification: A.C. MOTOR, 3 speed, 200/25/3.1 HP, 440V, 3 phase, 60HZ, Frame size 586 WVY, insulation class F, Nameplate AMP rating 247/40/14, Squirrel cage rotor, vertically mounted, continuous duty, manufactured by General Dynamics, Electro Dynamics Division. 1.4. Security Classification: Unclassified, CUI 2. REFERENCES 2.1 A.C. MOTOR; DWG No. 3586-3, REV A5 2.2 Electric Plant General, NSTM Chapter 300; NAVSEA S9086-KC-STM-010/CH- 300 2.3 Electrical Machinery Repair Technical Manual; NAVSEA S6260-BJ-GTP-010 3. REQUIREMENTS CAUTION - NOISE QUIET EQUIPMENT: Ensure AC Motor assembly is transported/moved on a shock mounted skid that the government will provide, when assembled. Component parts may be transported throughout the repair facility during the repair process without a shock-mounted platform but must be handled with extreme care. WARNING: COLLECTION/RECORDING OF VIBRATION DATA BY CONTRACTOR DURING OPERATIONAL TESTING IS EXPLICITLY FORBIDDEN. NOTE: Appendix A is provided to capture electrical, mechanical and visual inspections. Appendix B is provided to assist with Insulation Resistance correction, Winding Resistance correction and torque specs. 3.1.1. The contractor shall perform an as-arrived visual inspection, as-arrived electrical tests and mechanical checks of the AC Motor assembly in accordance with references 2.1, 2.2 and 2.3. The contractor shall record this data on Tables 1 through 3 in Appendix A. The contractor shall report these results to PNSDETSD Code 270, via email: -- 1 of 17 -- Page 2 of 3 3.1.2. The contractor shall then disassemble the AC Motor guided by references 2.1 and 2.3. The contractor shall clean all component parts and clean and dry the stator windings in accordance with references 2.1 and 2.3. The contractor shall perform visual inspections and electrical testing of the stator windings in accordance with References 2.1, 2.2 and 2.3. The contractor shall record this data on Tables 4 through 8 in Appendix A. The contractor shall report these results to PNSDETSD Code 270, via email: NOTE: Prior to determining whether rewind/replacement is required, the stator may be cleaned and dried 2 additional times and insulation resistance re- measured. 3.1.3. The contractor shall stop work and Notify PNSDETSD TPOC immediately shall the Stator winding, Insulation Resistance fails after the 3rd attempt at Cleaning & Drying. 3.1.4. The contractor shall allow PNSDET Code 270 to visually evaluate the winding insulation after Cleaning & Drying (at the contractor’s facility) to determine whether varnish treatment is warranted. If 270 authorizes Varnish Dip by checking “YES” in Table 8, The contractor shall proceed to Requirement 3.1.5. If PNSDET Code 270 checks “NO” for Varnish Dip in Table 8, The contractor shall proceed to Requirement 3.1.6. 3.1.5. The contractor shall Varnish Dip & Bake Stator Windings (If authorized in Table 8), using References (a), (b) & (c) as a guide. The contractor shall perform After Varnish Dip & Bake Electrical tests, visual inspection and record data on Tables 9 through 13 of Appendix A. 3.1.6. The contractor shall Re-assemble motor using References (a) & (c) as a guide and perform After Re-assembly Electrical and Mechanical checks. The contractor shall record this data in Tables 14 through 17 of Appendix A and table 21 in Appendix B. 3.1.7. The contractor shall perform an operational (No Load) test of the re-assembled motor and allow PNSDET Code 270 to obtain vibration data during the test (at the contractor’s facility). The contractor shall record this data in Tables 18 through 20 in Appendix A. 4. RESPONSIBILITITES 4.1. The Government will remove the AC motor and ship to the contractor’s facility. 4.2. The Contractor shall perform all work and obey Notes, Cautions and Warnings as described in Section 3 Requirements. 4.3. The Government will provide the contractor, engineering evaluations and vibration data collection as described in Section 3 Requirements. 4.4. The Government will provide any or all applicable references from Section 2 References. 4.5. The Government will ship the AC Motor assembly to Naval Base Point Loma. -- 2 of 17 -- Page 3 of 3 5. DELIVERY / RETURN 5.1. The Government will transport the motor to and from the contractor’s facility at the governments expense. 5.2. The Contractor is responsible for Loading and Unloading the motor to and from the Government owned truck at the Contractor’s facility. 6. General 6.1. Contractor shall provide all completed Tables in Appendix A & B to PNSDETSD TPOC within two business days once work is completed. TPOC EMAIL: -- 3 of 17 -- Appendix A - Page 1 of 10 Table 1: As-arrived Insulation Resistance Tests (pre-disassembly) Temperature-corrected to 25°C (77°F) Insulation Resistance Measurement (high speed): ____________________MΩ Insulation Resistance Measurement (medium speed): ____________________MΩ Insulation Resistance Measurement (low speed): ____________________MΩ Signature/ Print Name/ Date: Table 2: As-arrived Winding Resistance (pre-disassembly) Measured Winding Resistance (ohms) Corrected Winding Resistance (ohms) T1-T2 (low speed) T2-T3 (low speed) T1-T3 (low speed) T4-T5 (medium speed) T5-T6 (medium speed) T4-T6 (medium speed) T11-T12 (high speed) T12-T13 (high speed) T11-T13 (high speed) -- 4 of 17 -- Appendix A - Page 1 of 10 - “Expected”: each phase is expected to be 2.3866 to 2.6378 ohms (for low speed) - “Expected”: each phase is expected to be 0.5966 to 0.6594 ohms (for medium speed) - “Expected”: each phase is expected to be 0.0313 to 0.0347 ohms (for high speed) Required: Each phase must be within ±3 percent of the average of the 3 phases. Signature/ Print Name/ Date: -- 5 of 17 -- Appendix A - Page 2 of 10 Table 3: As-arrived visual inspectio…