S25_010_23410_HSUPpngRpr_754.docx

General Requirements

1. SCOPE

1.1 Intent. This standard specification invokes general requirements for conducting vessel repairs for Coast Guard vessels performed by commercial contractors at Non-USCG Facilities.

2. REFERENCES

COAST GUARD DRAWINGS

None.

COAST GUARD PUBLICATIONS

Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2022, Welding and Allied Processes Surface Forces Logistics Center Standard Specification 5550 (SFLC Std Spec 5550), 2022, Fire Prevention and Response

OTHER REFERENCES

None

3. REQUIREMENTS

3.1 General. The Contractor must conform to all requirements specified in SFLC Std Spec 0000 and in this item, as applicable, during the performance of this availability. The requirements of this WI applies to all work under the scope of this contract, whether explicitly stated in all following work items or not, and to all other work subsequently authorized by changes, modifications, or extensions to the contract.

3.2 Welding and brazing requirements. The Contractor must perform all welding and allied processes, and NDE in accordance with SFLC Std Spec 0740.

3.3 Fire Prevention. The Contractor must submit a Fire Prevention Plan in accordance with paragraph 3.1 of SFLC Standard Spec 5550. Coordinate with COR/KO and submit to upon contract award.

3.3.1 Fire Watch. The Coast Guard will provide fire watch personnel and equipment.

3.4 Period of Performance. The period of performance for this work is 07 March 2025 through 14 March 2025.

3.6 Location. The Contractor must perform the work while the USCGC JAMES is alongside the pier at Naval Station Norfolk, Norfolk VA 23511.

S25_010_23410_MLA_0225_754

1. Gas Turbine Hydraulic Start Unit Piping, Renew

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to renew a piping section and a low-point valve in the Gas Turbine (GT) Hydraulic Start Unit (HSU) hydraulic piping, as listed in Table 1.

1.2 Government-furnished property.

2. REFERENCES

Coast Guard Drawings Coast Guard Drawing 418A-WMSL-100-001, Rev B, General Arrangements Coast Guard Drawing 750-WMSL-556-001, Rev E, Gas Turbine Hydraulic Starting Module Hydraulic Diagram Coast Guard Publications Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2022, Welding and Allied Processes Surface Forces Logistics Center Standard Specification 5000 (SFLC Std Spec 5000), 2022, Auxiliary Machine Systems Surface Forces Logistics Center Standard Specification 6310 (SFLC Std Spec 6310), 2022, Requirements for Preservation of Ship Structures Other References American Society for Testing & Materials (ASTM) F708, 2022, Standard Practice for Design and Installation of Rigid Pipe Hangers

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.

None.

3.1.2 Tech Rep.

Not applicable.

3.1.3 Protective measures. The Contractor must furnish and install all protective measures in accordance with SFLC Std Spec 0000, paragraph 3.3.3 (Vessel component, space, and equipment protection).

3.1.4 Interferences. The Contractor must handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences). Known interferences include, but are not limited to the following:

· Oil in bilges (gas free certification required for hot work)

· Fuel tank 5-44-0-F

· Deck plating/grating

· Piping

· Piping Supports

3.1.5 Gas Free. The Contractor must certify and maintain work area to a condition ‘Safe for Hotwork’ in accordance with SFLC Std Spec 0740 paragraph 3.3.

3.1.5.1 The affected piping is in the lower level of the Forward Main Machinery Room (FMMR) bilge, which contains oily waste.

3.1.5.2 The affected piping is also approximately 4 inches above Diesel Fuel Storage Tank 5-44-0-F.

3.1.6 Fluid handling. The Contractor must remove and dispose of removed fluids from the affected piping system and any cleaning fluids, in accordance with all applicable Federal, state, and local regulations.

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

3.2 Operational test, initial. Prior to commencement of work, the Contractor must witness Coast Guard personnel perform an initial operational test of all items or shipboard devices to be disturbed, used, repaired, or altered, to demonstrate existing operational condition. Submit a CFR.

3.3 Bilge. The Contractor must clean bilge areas to allow for gas free certification and hot work in the area.

3.4 Diesel Fuel Tank 5-44-0-F. The Contractor must inert the tank or pump/clean the tank, as required by Marine Chemist, to allow for gas free certification and hot work in the area.

3.5 Piping Repair. The Contractor must renew the damaged section of hydraulic pipe and renew valve GTH-V-007 to bring the system back to full operational condition. See Table 1 and Figures 1 through 4 for location and interference details. Further piping arrangement and material details are provided in Coast Guard Drawings 418A-WMSL-540-001. If removal of other system piping is required for access, work directly with the CG Inspector to properly isolate those system(s) prior to disconnecting. Cap or plug any piping to prevent contamination.

TABLE 1 – LIST OF Hydraulic PIPING

Forward Main Machinery Room (FMMR) 5-44-01-E

Frame 52 4 ft. STBD of Centerline

2. Valve is socket welded and will need to be renewed (provided as GFE).

3. The discharge side of valve GTH-V-007 has a short leg of piping that terminates in the bilge of the lower FMMR. See Figure 3.

3.3.1 Isolate the hydraulic return line from the HSU and GT by disconnecting the pipe at the nearest connection points.

3.3.1.1 Cap or plug piping/systems as necessary to prevent contamination of the hydraulic piping not subject to repair.

3.3.1.2 Retain any valve placards/tags for use on the new low-point valve.

3.3.2 Flush the return piping clean and/or inert the pipe prior to conducting repairs.

3.3.3 Crop piping to allow for new pipe and low-point drain valve GTH-V-001 to be installed.

3.3.4 Install new piping and valve in accordance with SFLC Std Spec 5000 Appendix C2.3. A new low-point drain valve will be provided as GFE.

3.3.4.1 With CG Inspector approval, the Contractor may deviate from the existing routing configuration, as necessary, so long as the valve is accessible, terminates in the original location, and does not obstruct the access and/or operation of any other device.

3.3.5 Install a new pipe support on new piping/valve in accordance with ASTM F708. Pipe support must not obstruct the access and/or operation of any device. Obtain CG Inspector approval for the new pipe support location/configuration prior to installation.

3.3.5.1 Check that the Supply Side Low-Point drain (GTH-V-008) is properly supported. Submit CFR.

3.3.6 Nondestructive examination (NDE). The Contractor must perform a visual inspection and dye penetrant inspection of all new welds in accordance with SFLC Std Spec 0740, Appendix C. Submit a CFR.

3.3.7 Hydrostatic test. The Contractor must hydrostatically test all new piping to 135% of operating pressure in accordance with SFLC Std Spec 0740, Appendix C. Ensure zero leakage from or permanent deformation of pressure-containing parts by repairing all leaks, deformations, and discrepancies. Submit a CFR.

3.3.7.1 The operating pressure of the hydraulic return line is 150psi.

3.3.8 Cleaning. The Contractor must clean the internal surfaces of new and disturbed pipe to cleanliness Grade A in accordance with SFLC Std Spec 5000.

3.3.9 Reassembly. The Contractor must reconnect the hydraulic piping to the HSU and Gas Turbine using new O-Rings/Gaskets as required.

3.3.10 Preservation. Prepare and preserve the new piping, valve handle and pipe support in accordance with SFLC Std Spec 6310. Pipe and support colors to match adjacent piping, valve handle color to match removed valve handle, do not paint the valve stem.

3.3.11 Valve tag. Reinstall tag/placard that was removed from the old valve.

3.3.12 Fluids. Along with the CG Inspector, verify hydraulic fluid levels in the HPU prior to any testing, replenish as necessary. Ship’s force will provide required fluid.

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

3.8 Operational test, post repairs. After completion of work, the Contractor shall thoroughly test, in the presence of the Coast Guard Inspector and demonstrate all items or shipboard devices that have been disturbed, used, repaired, altered, or installed to be in satisfactory operating condition. Submit a CFR.

3.9 Touch-up preservation. The Contractor must prepare and coat all new and disturbed surfaces to match existing adjacent surfaces in accordance with SFLC Std Spec 6310, (Touch-ups and minor coating repairs.)

4. NOTES

Figure 1 - Excerpt from CG Drawing 750-WMSL-556-001 Plan 13B.

Figure 2 – Top view Frame 52, 4 feet Stbd of Centerline.

Figure 3 – Frame 52 looking forward.

Figure 4 – View at 5-44-0-F Tanktop.

image1.png image2.png image3.png image4.png