0512_A__OVERHAUL_LTFW_3_WAY_VALVES_Rev1.doc

USNS CHARLES DREW

(T-AKE 10)

Auxiliary Machinery

N32205-19-R-6007

2 JANUARY 2019

ITEM NO. 0512

Category “A”

MSC/N756/SA

OVERHAUL 3 LTFW 3-WAY VALVES

1.0 ABSTRACT

This item describes the removal of LTFW Cooler 3-way valve (3 ea.) for removal, overhaul & re-installation of same.

2.0 REFERENCEs

2.1 T6435-CP-MMC-010_0_D Control Valves Pressure/Temperature.

3.0 Item Location/Description

3.1 Location/Quantity

3.1.1 MMR

3.1.2 CFM: Garlock gasket material

4.0 Government Furnished Equipment/Material/Services:

4.1 VALVE PARTS:

PLUG,ROTARY,VALVE A62381 3 ea.

ROD END,OPERATOR VA 012482378 62306 3 ea

SEAL,PLAIN 012491628 62393 3 ea

SPRING,HELICAL,COMPRESSION012701569 62357 3 ea

PACKING,PREFORMED 009198384 42213 3 ea

BEARING,ROLLER,NEEDLE 012538912 N62376 3 ea

CUP-U,VALVE 012479863 62440 3 ea

O-RING 012519197 23955 3 ea

O-RING 012491634 60319 3 ea

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 GTRs including but not limited to GTRs 1 through 7, 22, 23, 24, 27, 28, and 29.

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.

6.0 Quality Assurance Requirements: None additional

7.0 Statement Of Work Required

7.1 Conduct operational test of all 3 valves with S/F to identify any pre-existing problems & document same with CFR.

7.2 Tagout/Lock out systems to allow for removal of valves. Remove all 3 valves to shop for overhaul. Immediately upon removal of valves, install 1/4” thick steel blanks with gaskets to provide system integrity should the need arise to energize the system while valves are out.

a. Disassemble valves & rebuild with GFM. Checkpoint for MSC rep to inspect & take pictures of pump internals after overhaul is complete. Cycle valve by hand on the bench.

b. Conduct 75 psi hydro to validate valve step and gland plate seal, this check is not prove the rotor to seat integrity.

c. Rig units to vessel and reinstall with new garlock gaskets, re-use existing fasteners with anti-seize.

7.3 Conduct operational test with Ships Force to validate mechanical joint integrity and cycle valve 3 times.

7.4 Submit report of work done, hydro results, operational test results to MSC rep.

8.0 General Requirements: None additional

WI-0512