204_A_Propulsion_Motor_and_Cooler_Cleaning_Inspection_Maintenance.doc

USNS WALLY SCHIRRA

(T-AKE 8)

200-MACHINERY, PROPULSION

N32205-16-R-4307

02 June 2016

ITEM NO. 204

Category “A” N756/RP/adt

PROPULSION MOTOR AND COOLER CLEANING, INSPECTION AND MAINTENANCE

1.0 ABSTRACT:

1.1 This work item describes the requirement to perform inspection, cleaning and maintenance on the Propulsion Motor.

2.0 REFERENCES:

2.1 T/M T9235-AG-MMC-010, Propulsion Motor, Synchronous, Motor Design M3HSX 305-126/16

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location/Quantity:

3.1.1 Location:

a. Propulsion Motor Room, (5-75-0)

3.1.2 Quantity:

a. One (1) Each Main Propulsion Synchronous Type Motor M3HXS 305-126/16 in a tandem configuration with two independent stators.

b. Four (4) Each Closed Air Circuit Water Coolers (CACW)

3.2 Bill of Materials (Contractor Furnished Material)

Contractor Provided Material (CFM)

(Assume 20 sqft total)

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES: None.

5.0 NOTES:

5.1 The Contractor and all Subcontractors, regardless of tier must consult the General Technical Requirements (GTR) to determine applicability to this work item. In performance of this work item, the Contractor and all Subcontractors regardless of tier must comply with the requirements of all applicable GTR’s.

5.2 The Contractor and all Subcontractors, regardless of tier are advised to review other work items under this contract to determine their effect on the work required under this work item. Many of the definitions relating to performance of this work item are found in Work Item 001.

5.3 THIS SHIP CONTAINS HIGH VOLTAGE (HV) ELECTRICAL SYSTEMS. OBEY ALL POSTED AND VERBAL INSTRUCTIONS REGARDING SAFETY AND EXCLUSION FROM HIGH VOLTAGE AREAS. AT NO TIME APPROACH, WORK ON, OR ENTER A HIGH VOLTAGE AREA WITHOUT PROPER AUTHORIZATION.

5.4 THE T-AKE CLASS ELECTRICAL COLOR CODING DOES NOT FOLLOW CONSISTENT COLOR SCHEME. THE SHIP IS KNOWN TO HAVE CURRENT CARRYING CONDUCTORS COLORED GREEN, BLUE, BLACK, AND WHITE. ASSUME ALL ELECTRICAL CABLES ARE ENERGIZED UNTIL TESTED AND PROVEN OTHERWISE. TEST ALL ELECTICAL CABLES TO ENSURE THEY ARE DE-ENERGIZED PRIOR TO WORKING ON THE ITEM.

6.0 QUALITY ASSURANCE REQUIREMENTS: None Additional.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Tag-Out all required systems and equipment. Drain and dispose of any liquid in accordance with all federal, state, and local regulations.

7.2 Perform all inspections, testing and maintenance under the direction of the manufacturer’s representative provided in Paragraph 7.8.

7.3 Provide all special tools, rigging support, industrial assistance and materials.

7.4 Perform inspection, maintenance and cleaning of the following Propulsion Motor items outlined in Sections 5.2 through 5.5 of Reference 2.1, under the direction of the Manufacturer’s Representative.

7.4.1 Section 5.2 of Reference 2.1 Three Month Check. Includes Collector Ring and Brush Gear Inspection.

7.4.2 Section 5.3 of Reference 2.1 Annual Checks. All items recommended in the instruction are to be included:

a. Clean the Machine Generally.

b. Clean all air ducts and passages.

c. Clean the windings.

d. Check the end windings, and ensure all supports and bindings are tight.

e. Measure the Insulation Resistance. Perform test Using Reference 2.1 Section 3.8 instruction for Insulation Resistance Test(IR)and Polarisation Index Test. Readings shall be taken prior to and after Motor Winding Cleaning referenced in Section 5.5 of Ref. 2.1.

f. Check all connections for cleanliness and tightness. Look for signs of overheating. Check all continuity bonds and earth connections.

g. Check the bearing insulation.

h. Check fans, air seals and oil seals.

i. Clean the coolers identified in 3.1.3. (Refer to sections 3.14, 5.8, 7.7 and 10.5 of Reference 2.1. Renew all disturbed gaskets using Bill of Materials as guidance. Perform hydrostatic test of unit prior to reassembly.

j. Check the heaters are all in working order.

k. Check the cleanliness of the filters. Replace the filter material.

l. Check the collector rings, brushes and brush holders for signs of wear and clean (refer to section 7.5 of Reference 2.1.

7.4.3 Section 5.4 of Reference 2.1 Propulsion Motor Cleaning.

7.4.4 Section 5.5 of Reference 2.1 Propulsion Motor Winding Cleaning.

a. Temporarily remove the end shield and baffles from both the drive and non-drive ends of the motor to gain access to the slip rings and stator/winding area (See Figure 1-1). Additional information can be found in Section 7.12 of Reference 2.1.

b. Temporarily open emergency inlet air doors in frame. Remove the main terminal covers.

Figure 1-1

7.5 Hydrostatically pressure tests all four (4) coolers to 50 psi in the presence of MSCREP and ABS Inspector.

7.6 Manufacturer’s representative shall provide a service report of findings, maintenance actions performed, measurements recorded, and future recommendations.

7.7 Touch-up paint disturbed surfaces to match surrounding areas.

7.8 Manufacturer’s Representative:

7.8.1 Provide the services of a Manufacturer's Representative for inspection, cleaning, maintenance and testing. An operational test shall be performed by the OEM Representative.

a. Point of Contact For OEM Services:

David Thornton GE Energy Cell: 804.955.0015

E-mail: david.thornton2@ge.com

8.0 GENERAL REQUIREMENTS: None Additional.

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