0955_A_STERN TUBE SEAL ASSEMBLY (5YR)(SCSI)_TAOE_CCSI.docx

USNS ARCTIC

(T-AOE 8)

STERN TUBE SEAL ASSEMBLY (5 YR)(SCSI)

ABSTRACT

The purpose of this item is to temporarily remove and refurbish the stern tube seals.

REFERENCES

NAVSEA Drawing 243-6360792, Propulsion Shaft Arrangement, P/S NAVSEA Drawing 244-6360797, Stern Tube Seal Assembly and Details, P/S NAVSEA Tech Manual S9243-BE-MMA-010/71724, Seal Assembly, Operation and Maintenance (ETM12998) Crane Drawing US71686, GA OF 30.750” Type MX9 Seal, AOE-6 Class Crane Drawing WL P001281-001, MX-9 Overhaul Kit

ITEM LOCATION/DESCRIPTION

Location Locations Stern tube seal assembly, port and starboard propulsion shafts Item Description/Manufacturer’s Data

John Crane/Wartsila Defense MX9 Stern Tube Seal Assembly Quantity: Two (2)

GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE

Government Furnished Equipment: None

1.1 Government Furnished Material: Seal Overhaul Kit, P/N: WLP001281-001, Quantity: Two (2) Government Furnished Service: None

NOTES

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 including but not limited to GTR’s 1 through 7, 22, 23, 24, 28, and 29.

The contractor and all subcontractors regardless of tier are advised to review other work items under this contract, including but not limited to Work Items 023, 901, and XXX 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.

QUALITY ASSURANCE REQUIREMENTS: None additional

STATEMENT OF WORK REQUIRED

Temporarily remove and refurbish the stern tube seal assemblies using References 2.1 through 2.5 as guidance.

Coordinate with ship’s force to have associated equipment locked and/or tagged out per ship’s lock out/tag out policy. When the maintenance is complete, coordinate with ship’s force to have associated equipment unlocked and/or tagged in per ship’s lock out/tag out policy.

Drain and dispose of any liquid in accordance with all local, state, and federal laws.

Provide the services of a certified representative to observe the removal, disassembly, inspection, and reassembly of the stern tube seal assemblies.

Temporarily remove and refurbish the stern tube seal assemblies identified in section 3.0 in a clean machine shop environment using Reference 2.3 as guidance.

1.1.1 Inspect the stern tube seal emergency inflation equipment including inflation bottles, regulating equipment, shutoff valves, piping and fittings. Submit an “as found” condition report.

Transport the stern tube seal assemblies from ship to shop for inspection of surfaces and refurbishment. Inspect all mating sealing surfaces including shaft and liner surfaces upon temporary removal of the stern tube seal assemblies. OMT REP and ABS to witness.

Take and record dimensional readings prior to disassembly. Submit one (1) electronic copy in Portable Document Form (PDF) of the “as found” condition report.

Disassemble the stern tube seal assemblies.

Clean and inspect all components and the mating sealing surface for defects. OMT REP and ABS to witness. Submit three (3) typewritten and one (1) electronic copy in Portable Document Form (PDF) of the “as found” condition report.

Machine the new seal seats to obtain 32 RMS surface finish using Reference 2.3 as guidance.

Reassemble stern tube seal assemblies using seal overhaul kits identified in paragraph 4.2 using Reference 2.3 as guidance.

Transport the stern tube seal assemblies from shop to ship and reinstall.

Adjust and set the seal compression using Reference 2.3 as guidance.

With the assistance of ship’s force, align the seat to run true with the shaft to within 0.002” while shaft is rotating on the jacking gear using Reference 2.3 as guidance.

Maintain designed positioning and clearances.

With the assistance of ships force, clear tags.

Accomplish an operational test of the stern tube seals during dock and sea trials. Notify ABS and OMT REP to witness tests. Ensure the seal does not exceed the maximum allowable leakage rate.

Reports: None additional Painting/Lagging Mechanically clean, prepare, prime, paint and restore all new, soiled, and disturbed surfaces to match surrounding surfaces. Replace all removed and disturbed insulation and lagging.

Manufacturer’s Representative Provide the services of a certified Wartsila Defense Marine Field Technical representative to observe disassembly and reassembly of the Stern Tube Seal assemblies. Inspection shall be accomplished of all mating sealing surfaces including shaft or liner surfaces upon removal of the propulsion shaft.

The Wartsila Defense Marine Field Technical representative is to oversee disassembly, reassembly, alignment, tests and perform dock and sea trials to ensure satisfactory installation and operation.

This work item requires maintenance and repair actions to be performed on a MSC ship critical safety item. Only original equipment manufacturer (OEM) authorized technical field service providers or MSC qualified non-OEM technical field service providers and OEM authorized or MSC qualified non-OEM parts shall be used to accomplish the requirements of this work item for this ship critical safety item including oversight and guidance on all aspects of equipment as-found condition inspection, removal, disassembly, reassembly, repairs, modifications, reinstallation, and testing as applicable. The technical service provider is to attend dock and sea trials.

Contractors interested in gaining MSC qualification as a non-OEM parts and/or service provider should visit this website for qualification and submittal requirements: https://procurement.msc.navy.mil/.

Possible Source Wartsila Defense, Inc. Marine 3617 Koppens Way Chesapeake, VA 23323 Office Phone: (757)558-3625 Office Fax: (757)487-3658

Provide the OMT REP with a signed letter of qualification from the Original Equipment Manufacturer and certificate of training for the field service representative for the equipment listed in section 3.0 prior to the start of any work.

Preparation of Drawings: None additional GENERAL REQUIREMENTS: None additional 955-1