0919_B_Replace Stern Tube Shaft Bearing LinersARCTICROH14R2.doc

USNS ARCTIC

(T-AOE 8)

DRYDOCKING AND UNDOCKING

RFP NO. N32205-14-R-2000

Ammendment 001

ITEM NO. 919

CATEGORY "B"

MSC/PM1CM2/MJP/jb Replace Stern Tube Shaft Bearing Liners

1.0 ABSTRACT:

1.1. This item describes the requirement to install new shaft liners on the two Stern Tube Propulsion Shafts and one propeller shaft.

2.0 REFERENCES:

2.1. NAVSEA Drawing 243-6360794 Rev H, Intermediate and Stern tube Shaft Details, Port and Starboard

2.2. NAVSEA Drawing 243-6360793 Propeller Shaft Details

3.0 ITEM LOCATION/DESCRIPTION:

3.1. Location/Quantity:

3.1.1. Location: Contractors Shop

3.1.2. Quantity: Six

3.2. Item Description/Manufacturer's Data:

3.2.1. Shafting:

a. Stern Tube Shafts (2) Water lubricated stern tube shafts, QTY = 2; Material: Forged Steel, MIL-S-23284, Class I; Diameter: Shafts are 28.500" in diameter with three 30.750" diameter sleeves. Forward stern tube shaft flange diameters are 40" and aft stern tube shaft flange diameters are 45" Length: Port stern tube shaft is 59'-7 3/8" long and the starboard stern tube shaft is 36'-8" long Weight: Port stern tube shaft weighs 90,000 pounds and the starboard stern tube shaft weighs 57,600 pounds

b. Propeller Shaft (1)

3.3. Bill of Materials: None Additional

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES:

4.1. Government Furnished Equipment: None Additional

4.2. Government Furnished Material:

4.2.1. New rough Centrifugal Cu-Ni Castings as shown in Reference 2.1.1 and 2.1.2; Qty = 6; Castings are roughly 0.250 inches heavy on diameters and length. No machining has been done for end reliefs or split joints.

4.3. Government Furnished Services: None Additional

5.0 NOTES:

5.1. The contractor and all subcontractors regardless of tier shall 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.

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. Contractor to provide all labor and materials to accomplish work under this item.

7.2. Chart axial position of liner on shaft.

7.3. Upon approval of MSCREP machine old liner from stern tube shaft taking care not to machine into shaft.

7.3.1. Inspect shaft area under existing liner by Magnetic Particle inspection for cracks. Report any cracks found immediately to MSCREP. Document results.

7.3.2. Dimensionally inspect shaft in way of removed sleeve, Diameter shall be taken every thirty (30) degrees at five equidistant axial locations along the original sleeve location.

7.3.3. Submit weld procedure, monitoring procedure, inspection requirements and joint design to be used for installing new sleeves. For MSC and ABS approval. Procedure shall be developed by a certified Welding Engineer with experience in this type of work.

7.3.4. Machine new GFM liner for installation using approved procedure.

a. Install new GFM liner using approved procedure

b. (CHECKPOINT) Notify MSCREP and ABS when fit-up is completes and welding process is ready to begin. Fit-up shall be per approved procedure

7.3.5. Perform inspections per approved procedure.

7.4. Machine new liner to requirements of Reference 2.1.

7.4.1. Repeat inspections approved under 7.3.2. At a minimum a Die Penetrant examination of all welded areas shall be accomplished.

7.5. Perform dimensional inspection on finished liner installation, record all results;

7.5.1. (CHECKPOINT) Diameter of finished liner shall be taken every thirty (30) degrees at five equidistant axial locations along the sleeve.

7.5.2. Take axial position of the liner’s forward and after ends relative to the forward flange

7.6. Inspection/Test:

7.6.1. Submit a report at the end of all work documenting all inspection and readings called out in this specification

7.7. Painting:

7.7.1. None Additional; refer to Work Item 912

7.8. Marking: None

7.9. Preparation of Drawings/Documentation: None

7.10. Manufacturer’s Representative: None

8.0 GENERAL REQUIREMENTS:

8.1. Submit pricing with proposal for accomplishing each of the following.

8.1.1. Install Forward Liner on STBD Stern Tube Shaft.

8.1.2. Install Aft Liner on STBD Stern Tube Shaft

8.1.3. Install Forward Liner on PORT Stern Tube Shaft.

8.1.4. Install Aft Liner on PORT Stern Tube Shaft.

8.1.5. Install Forward Liner on Propeller Shaft.

8.1.6. Install Aft Liner On Propeller Shaft.

919-4