0904 - SEA VALVES AND OVBD DISCH VALVES.DOC

USNS SIOUX

T-ATF 171

DRYDOCKING

CONTRACT NO.

ITEM NO. 0904

CATEGORY "A"

6/15/2010

SEA VALVES AND OVERBOARD DISCHARGE VALVES (USCG AND ABS SURVEY)

/Satcher/KS

1.0

ABSTRACT

1.1 This work item describes the requirements for the contractor to disassemble, clean, inspect, repair and reassemble the Sea Valves and Overboard Discharge Valves.

2.0 REFERENCES: None

3.0

ITEM LOCATION/DESCRIPTION

3.1 Location/Quantity

3.1.1 Location: All valves located throughout the ship (see Paragraph 3.2.1)

3.1.2 Quantity: A total of eighteen (18) valves of various sizes

3.2 Item Description/Manufacturer's Data

3.2.1 Item Description: For approximate size, type, and service of each valve, see table that follows.

Location/Service Size Type (inches)

4-54-1, Main Sea Suction 14 butterfly

4-54-2, Main Sea Suction 14 butterfly

4-54-4, Fire Main Sea Suction 12 butterfly

4-55-2, Sea Water Circulating 4 globe

4-54-2, Sea Chest Blowdown 1/2 globe, angle

4-54-1, Sea Chest Blowdown 1/2 globe, angle

4-55-1, Sea Chest Vent 2 gate

4-54-2, Sea Chest Vent 2 gate

3-71-1, SSDG Salt Water Cooling

Overboard

4 gate

3-41-1, Sewage Overboard 4 stop check

3-60-2, Main Engine Salt Water

Cooling Overboard 8 butterfly

3-35-2, Brine Overboard 4 butterfly

3-59-2, Bilge and Ballast

Water Overboard 6 butterfly

3-41-2, Ballast Water Overboard 6 butterfly

3-47-2, Auxiliary Machinery

Cooling Water Overboard 8 butterfly

3-68-1, Oily Water Separator

Overboard 3/4 Stop Check

3-18-0, Speed Log Transducer 3 Gate

3-35-1, Walk-in Reefer Box Drain 2 Gate

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE/INFO: 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 must comply with all applicable GTR including but not limited to GTR1 through 7, 22, 23, 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.

5.3 All dirt, debris, and liquids resulting from this work shall be removed from the ship daily and all areas involved left clean.

6.0 QUALITY ASSURANCE REQUIREMENTS: Refer to item 0004 7.0

STATEMENT OF WORK

7.1 Mechanical/Fluid

7.1.1 Using bypasses, provide temporary seawater supply to and discharge from A/C and refrigeration units for the duration of the sea valve repairs.

7.1.2 To facilitate valve repair and detachment, remove rod connections to all valves so equipped.

7.1.3 To permit external examination, clean all pads, nipples, studs, spool pieces, flanges, and other such hull connections that secure the various valves and their appurtenances to the hull.

7.1.4 Unbolt and convey from ship to shop all the valves listed in preceding table.

7.1.5 Disassemble and thoroughly clean valves. Determine repairs required to place valves in serviceable condition. Submit in triplicate to the MSC Representative a typewritten report listing any defective, deteriorated, or missing components.

7.1.6 Renew or repair all valve internals, stems, guides, seats, discs, and gates, using material similar to original when new. Replace with new: all valves smaller than 2-1/2 inches. Task requires five (5) valves.

7.1.7 Grind and spot-in all globe and gate valve discs to their valve seats to provide 100 percent contact.

7.1.8 Free and dismantle all stems from valve bonnets; polish stems and repack packing glands.

7.1.9 Replace with new: all O-rings on all butterfly valves.

7.1.10 Thoroughly clean internal surfaces and apply to bare areas one (1) coat Apexior No. 3 or equal.

7.1.11 After all stipulated repairs and inspections are completed and after all work has been accepted by the MSC Representative, reassemble all valves, replacing missing or defective studs, bolts, and nuts with "CRES" material. Task requires an estimated fifty (50) replacements. Repack stuffing glands and ready valves for shop test.

7.1.12 Conduct shop hydro test of all removed valves to prove water tightness in the presence of the MSC and Regulatory Body Representatives.

7.1.13 Reinstall all removed valves, examine all hull fasteners, and renew missing or defective stud bolts and nuts with "CRES" material. Task requires estimated fifty (50) replacements.

7.1.14 Inspect all reachrod assemblies. Free up universals. Lubricate and renew defective bolting and pins. Repack stuffing boxes at deck connections. Reconnect all reach rod assemblies to respective valves.

7.1.15 Open and close all valves to ensure proper open and close capabilities. Test valves with reach rods from operating stations. Ensure the Chief Engineer and MSC Representative witness all operational checks.

7.1.16 When ship becomes waterborne, inspect valves and prove watertight. Ensure the Chief Engineer and MSC Representative witness inspections.

7.1.17 Submit in triplicate to the MSC Representative a typewritten report that lists valves worked on; number of completed valve repairs; location; size, and type of valves; and details of work done on each valve.

7.2 Preparation of Drawings/Documentation: None

7.3 Inspection/Test

7.3.1 Conduct visual inspection in presence of ABS Surveyor, USCG and MSC Representative.

7.3.2 Hydro-test all sea and overboard discharge valves in accordance with criteria established by regulatory bodies.

7.4 Painting

7.4.1 Prime and paint all new and disturbed surfaces to match surrounding areas.

7.5 Manufacturer's Representative: None

8.0 GENERAL REQUIREMENTS: None additional.

NewPengCons

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