SOW CGC BOTTOMS RFQ NR 52000PR230021067 ASW REPAIRS.docx

Scope of Work for CGC BENJAMIN BOTTOMS Centerline ASW Shaft Cooling Tree

REVISED RFQ NR 52000PR230021067 CGC BOTTOMS ASW REPAIRS

Temp repair options (in water):

· Wrap existing patch with synthoglass or S2S Sailor Putty tape to reinforce.

Full Repair Scope (in water):

· References:

· 154-WPC_256_301 Rev. D: Main and Auxiliary Cooling System Diagram

· 154-WPC_524_201 Rev. D: Auxiliary Cooling System Arrangement

· SFLC Std Spec 0000 – General Requirements. 2022

· SFLC Std Spec 0740 – Welding and Allied Processes, 2022

· SFLC Std Spec 5550 – Fire Prevention and Response, 2022

· SFLC Std Spec 6310 – Requirements for Preservation of Ship Structures, 2022

· See “Final Piping Replacement Mark Up” diagram: Using 70-30 CuNi, renew ASW piping from the weld in header to the first flange before valves (for 3” piping) and to the first braze prior to shaft cooling supply COVs (1.5” piping).

· Current known existing conditions: Holes on both 1.5” pipes, along where the pipe meets the 3” main line, patched with rubber patches and metal bands. Patch is currently holding. All piping involved is currently 90-10 CuNi.

· Approximately 6 ft of 3” wide piping, approximately 6” (round up to 1 ft) of 1.5” piping.

· Parts needed, see “Part Plan 58-C” from 154-WPC_524_201:

· 033 – 3” diameter, BSI: 5126520, ELL 3” 200# 45 BW LR CNA 90/10 (change to 70/30)

· 035 – 3” diameter, BSI: 5126500, ELL 3” 200# 90 BW LR CAN 90/10 (change to 70/30)

· 066 – 1.5” diameter, BSI: 5368100, PIPE COPPER NICKEL SMLS 706-90/10 Class 200 (01.500) 1-1/2 inch 0.072 wall w/ certs (change to 70/30 CuNi)

· 069 – 3” diameter, BSI: 5371100, PIPE COPPER NICKEL SMLS 706-90/10 Class 200 size (03.000) 3 in 0.095 wall w/ certs (change to 70/30 CuNi)

· Interferences: Includes but is not limited to - deck plate supports, valves, pipe supports, ASW and firemain gauge lines etc.

· Safety Precautions: Prior to opening seawater system for repairs at a location where there are less than two barriers to the sea (e.g. isolation valve, blank-able flange, pump, etc.), submit proposal that will mitigate elevated risk of compartment flooding (e.g. increased damage-control watch standing personnel, readying of temporary dewatering equipment, diver services, and temporary cofferdam installation, etc.) appropriate to particular situation/configuration/risk-level.

· Ship’s Force will perform electrical isolation, tag-out procedures, etc. Coordinate with Ship’s Force and ensure all of this work is complete prior to performing any maintenance.

· After all authorized repairs, hydrostatically test all new and disturbed piping and components in accordance with SFLC Std Spec 0740, Appendix, Hydrostatic Test. Ensure zero leakage from or permanent deformation of pressure containing parts by repairing all leaks, deformations, and discrepancies.

· Touch- ups in accordance with Std Spec 6310 and 0000 (Appendix A – Requirements for Preservation of Ship Structures).

Period of performance: July 17-21 2023

· Location: 1001 S Seaside AVE

· San Pedro CA 90731