0527_B_Grey_Water_Transfer_Pump_Overhaul.docx

USNS CARL BRASHEAR

(T-AKE 7)

GREY WATER TRANSFER PUMP OVERHAUL REV -

1.0 ABSTRACT:

1.1. This item provides for overhaul of the Gray Water Transfer Pump.

2.0 REFERENCES:

2.1. Military Sealift Command Legacy Standard Work Item - Item No. 87 “Shop Overhaul of Centrifugal Pumps” (included in paragraph 8)

2.2. Technical Manual, T6225-MS-MMC-010, Pumps, Centrifugal, 0510 Vortex

3.0 ITEM LOCATION/DESCRIPTION:

3.1. Location : (3-75-6)

3.2. Item Description/Manufacturer's Data:

3.2.1. Pump:

a. Application – Gray Water Pump

b. Buffalo Pumps Type – 0510 Vortex

c. Buffalo Shop Order - 02450846

d. Rotation - CW

e. Capacity – 51 GPM

f. Total Head – 115 Feet

g. Liquid Handled – Gray Water

h. Suction Pressure - 13 Feet

i. Suction Temperature – 35o C

j. RPM - 1800

k. Efficiency – 22%

l. Brake Horsepower At Rating - 7

m. Brake Horsepower At Any Condition – 9.98

n. Actual Shut-Off Head - 115

o. Hydrostatic Test Pressure – 100 psi

p. Final Impeller Diameter – 10”.

4.0 GOVERNMENT FURNISHED MATERIAL: None

5.0 NOTES

5.1. The contractor and all subcontractors regardless of tier shall consult the General Technical Requirements (GTR) to determine their effect on the work items in this work package, which may be effected by the requirements of this item.

5.2. The contractor and all subcontractors, regardless of tier, are advised to review the other Work Items under this contract to determine their effect on the work required under this Work Item.

5.3. This ship contains High Voltage (HV) electrical systems. The contractor and subcontractors shall obey all posted and verbal instructions regarding safety and exclusion from High Voltage areas. At no time shall a contractor or subcontractor 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. The contractor shall assume all electrical cables are energized until tested otherwise. The contractor shall test all electrical cables to ensure they are de-energized prior to working on the item.

5.5. All shipboard lockout tag out procedures shall be followed by the contractor.

6.0 QUALITY ASSURANCE REQUIREMENTS: None additional

7.0 STATEMENT OF WORK REQUIRED:

7.1. Isolate and tag out the system. Drain the affected piping and dispose of affected liquids (Gray Water and effluents) in accordance with federal, state and local regulations.

7.2. Clean and gas free to ensure the area is safe for hot work. Competent Marine Chemist shall certify that the area and space are safe for hot work daily.

7.3. Accomplish the requirements of reference 2.1 for equipment defined in paragraph 3.2.1.

7.4. Reinstall pump, ensuring proper alignment to both the motor coupling and piping attachments per the guidance provided in reference 2.2 and operationally test during dock trials to verify proper operation. Ensure unit is properly lubricated before operation.

7.5. Inspection/Test

7.5.1. Operationally test new piping after installation. No leaks allowed

7.6. Paint/Lagging:

7.6.1. Renew lagging where old lagging was removed. Paint all new and disturbed surfaces to match surrounding surfaces.

7.7. Manufacturer's Representative: None

7.8. Preparation of Drawings: None

8.0 GENERAL REQUIREMENTS:

8.1. Standard item 087

DEPARTMENT OF THE NAVY

MILITARY SEALIFT COMMAND, ATLANTIC

ENGINEERING DIRECTORATE

BAYONNE, NEW JERSEY 07002

STANDARD ITEM NO. 87, REVISED 2 APRIL 1993

SHOP OVERHAUL OF CENTRIFUGAL PUMPS

Provide all material and special equipment. Make all removals and restorations. Remove and replace all interferences, rig and unrig, make all disassemblies and subsequent reassemblies to accomplish the following work. (Material, unless specifically stated as Government Furnished Material (GFM) shall be supplied by the contractor).

Perform the following on all pumps:

1. Drain and disconnect pump from piping, motor and foundation. Clean and retain for reinstallation all removed bolting, gauge lines, fittings, etc., in way of removals. Blank all open ended piping with blind flanges, screw caps or plugs as appropriate. Cardboard or sheetmetal blanks or wooden plugs shall not be permitted. Remove existing coupling. Transport pump to repair facility. Report to the MSC Port Engineer any pipe misalignment and deteriorated or defective foundations.

2. Completely disassemble pump. Sandblast and thoroughly clean the interior and exterior of casings. Protect machined surfaces. Inspect the casings and pump components for wear and defects in the presence of the Chief Engineer and the MSC Port Engineer. Provide a written condition report to the MSC Port Engineer with a copy to the ABS surveyor.

3. Build up worn and eroded areas of pump casing by welding/brazing with parent metal and machine to original configuration. Belzona material applied in an approved manner may be used for low stress areas when authorized by the MSC Port Engineer. Build up eroded areas of impeller by brazing with parent metal and machine to manufacturer's specifications. Inspect pump shaft for distortion, defects, deterioration and conformance to manufacturer's specifications. Straighten shaft to within 0.002-inch total indicator runout (TIR). Correct minor irregularities on running surfaces by polishing.

4. Replace with new all bearings, wearing rings, shaft sleeves, couplings, keys, locks and nuts to restore the pump to the original design condition. Reassemble pump using new gaskets, packing, seals and grease fittings. Hand dress mating and sealing surfaces to remove raised metal. All clearances and tolerances shall be within manufacturer's specifications. Notify the ABS surveyor and the MSC Port Engineer for inspection four (4) hours prior to closing of the pump. Dynamically balance the rotating assembly in the presence of the MSC Port Engineer. Record and provide a written report of "as released" clearances to the MSC Port Engineer.

5. Additional parts required and not specifically mentioned in this item shall be provided by the contractor. All new parts will be manufacturer's original parts. If parts are unavailable, the contractor may fabricate same, provided that manufacturers design characteristics and tolerances are retained, materials used are identical to OEM parts and prior approval from the MSC Port Engineer is obtained. Submit dimensions and material listing of contractor manufactured parts to the MSC Port Engineer.

6. Prior to installing pump, pump foundation shall be machine scaled and painted with two (2) coats of primer and one (1) finish coat to match existing color scheme. Transport pump to ship. Align and connect pump to drive unit in accordance with manufacturer's requirements. Ream holes and install new dowel pins. Remove blanks and reconnect piping without transmitting piping strains to pump. Use new gaskets and fasteners. Rotate pump by hand and verify freedom of rotation. Restore all damaged or missing insulation in accordance with MIL-STD-769. Paint all new and disturbed areas as above.

7. Perform an operational test for pump under actual service conditions for four (4) hours consecutive running time. Record output pressures every thirty (30) minutes under normal load. Multi-speed pumps shall be tested equally at all speeds within the four (4) hour running period. During the test, operation of automatic pressure and level switches shall be demonstrated. Operation of automatic priming systems shall also be demonstrated. Pump tests may be held in conjunction with piping system tests. Pump shall meet or exceed operational specifications for a new pump as delineated by the pump manufacturer. Correct any deficiencies found in contractor's work.

Pumps to be dealt with shall be as set forth in the basic specification.

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