0575_B_WEATHERDECK_PIPING_REPAIRS(1).doc

USNS LEWIS AND CLARK

(T-AKE 1)

MACHINERY, AUXILIARY

N32205-18-R-4253 19 October 2017

ITEM NO. 575

Category “B”

MSC/N756/LSC

WEATHERDECK PIPING REPAIRS

1.0 ABSTRACT

1.1 This item describes the requirement to repair various piping in the weather deck.

2.0 REFERENCES/ENCLOSURE

2.1 ABS Steel Vessel Rules, Part 7 Rules for Survey After Construction.

2.2 MSC DWG. 55-8194707, Ships Service & Control Air system Diagram.

3.0 ITEM LOCATION AND DESCRIPTION

3.1 Sta. 7: 40' of 3/4” steel pipe, pipe hangers; 20AL01-136 Air Station #74

3.2 Sta. 6: 5' of 3/4” steel pipe; 20AL01-113 Air Station #93

3.3 Sta. 5: 3' of 3/4” steel pipe: 20AL01-114 Air Station #92

3.4 02-44-2: 5' of 1/2” steel pipe 15AL01-075 Air Station #129

3.5 The following valves need to be provided: AL-V-148, AL-V-149, AL-V-185 and AL-V-130.

3.6 Various Bulkhead Stuffing Tubes and Deck Kickpipes. Assume twenty five (25) stuffing tube and kick pipe 1” needs replacement.

4.0 GOVERNMENT FURNISHED EQUIPMENT/ MATERIAL: None.

5.0 NOTES

5.1 The Contractor and all Subcontractors, regardless of tier, must consult the General Technical Requirements (GTRs) to determine applicability to this work item. In performance of this work item, the Contractor and all Subcontractors must comply with the requirements of all applicable GTRs.

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.

5.3 This ship contains High Voltage (HV) electrical systems. The Contractor and all Subcontractors shall obey all posted and verbal instructions regarding safety and exclusion from High Voltage areas. At no time shall a Contractor or Subcontractor approach, work on, or enter a High Voltage area without proper authorization.

5.4 THE T-AKE CLASS ELECTRICAL COLOR CODING DOES NOT FOLLOW CONSISTENT COLOR SCHEME. THE SHIP IS KNOWN TO HAVE CURRENT CARRYING CONDUCTORS COLORED GREEN, BLUE, BLACK AND WHITE. THE CONTRACTOR SHALL ASSUME ALL ELECTRICAL CABLES ARE HOT UNTIL TESTED OTHERWISE. THE CONTRACTOR SHALL TEST ELECTRICAL CABLES TO ENSURE THEY ARE DEAD PRIOR TO WORKING ON THE ITEM.

5.5 All specified measurements, dimensions and lists of fittings in this work item are approximate. Contractor shall verify all exact locations, quantities, and dimensions during shipcheck.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 All welding Certification, Materials and Procedures shall be in accordance with American Bureau of Shipping (ABS) requirements.

7.0 STATEMENT OF WORK REQUIRED

7.1 Provide services of a licensed marine chemist to certify and maintain all areas requiring hot work. Contractor shall provide fire watch during all portions requiring hot work. Fire watch will have a means of extinguishing fire independent of ships portable or fixed system.

7.1.1 Protect ships equipment and structure and deck coverings from damage.

7.1.2 New pipe sections shall be targeted and templated from existing (as found required); and shaped, hung, fitted, and/or flanged as per existing arrangement.

7.1.3 Replace existing hardware with new CRES hardware as required for all repaired piping systems.

7.1.4 Replace gaskets in all new and disturbed mechanical joints.

7.2 Accomplish walkthrough with C/E, C/M and MSCREP prior to starting work. Use existing piping as a template to replace all piping with same material. Submit condition report for additional work not covered under this specification.

7.3 Complete piping replacement by welding and brazing of the joints for piping systems. All welds performed shall be NDT tested with a dye penetrate test to assure no cracks are formed. Piping shall be bent to a radius that would not cause a reduction of wall thickness to a value less than that required by ABS SVR for the relevant design pressures and temperatures. All bending shall be conducted without rupture, wrinkles at inside bends, thinning of outer wall bends below minimum allowable thickness, collapse or out of roundness. Additionally, the minimum wall thickness of pipes shall not be less than that indicated in ABS SVR 4-6-2/Table A & B for other metal pipes.

7.4 Replace Four (4) Valves listed in paragraph 3.0

7.5 Piping system shall be supported with pipe hangers. New gaskets shall be provided with all new joint make ups. Provide new fasteners as required to make up new flanges. Anti-seize compound shall be applied to prevent future seizure of nuts/bolts.

7.6 The contractor shall perform functional, operational, and hydrostatic tightness tests with SF rep and ABS. Hydrostatic test shall be conducted at 50 psi. Contractor shall correct any leak or discrepancy found during testing.

7.7 Clean and prepare new disturbed areas and apply contractor furnished inorganic zinc primer, one strip coat of epoxy primer, one full coat of epoxy primer and one full coat of urethane to match surrounding all coats to be 5-6 mils DFT unless specified otherwise in product application guide. Contractor shall perform inspections after completion of each stage of surface preparation, each coat, and each stripe coat to verify surface condition, space cleanliness, and before requesting final inspection by the MSCREP. Ensure pipes are stenciled waste drain and directional flow arrows installed every 10 feet.

7.8 Provide final report and updated drawing indicating new piping, valves, material and notes similar to previous revision to Chief Engineer and MSCREP.

8.0 GENERAL REQUIREMENTS: None additional.

575-3