0101_A_STRUCTURAL_INSPECTIONS.docx

USNS TRENTON (T-EPF 5)

STRUCTURAL INSPECTIONS

1.0 ABSTRACT:

1.1 This item describes the shipwide structural inspections in TRENTON.

2.0 REFERENCES:

2.1 JHSV_Structural Inspection Guide

2.2 8443364_F General Arrangement

2.3 8444521_A Tunnel FR 8-24

2.4 8444522_A Tunnel FR 25-41

2.5 8444524_A Tunnel FR 52-70

2.6 8444545_B Tunnel FR 71-82

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Locations

3.1.1 Various, throughout the ship.

3.1.2 Main Engines and SSDG Exhaust Pipes:

3.1.2.1 The areas in way of welding around the circumference of exhaust penetration.

3.1.2.2 Rings welded to the shell plate, between hull penetration and exhaust pipings.

3.1.2.3 Exhaust cowling circumferential welds.

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE: None.

5.0 NOTES:

5.1 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 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. Many of the definitions relating to performance of this work item are found in Work Item 0001.

5.3 The contractor shall furnish the services of an ABS approved Non-Destructive Test (NDT) Inspection and Analysis company.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 The contractor shall document the findings as stated in this SOW and provide a Report.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Furnish access to locations for inspections identified in 2.1 and 3.1.2 to include removal of man-hole covers, scaffolding, lighting, ventilation, hangers and removal of insulation.

7.2 Furnish services of Marine Chemist to certify spaces for inspection as “Safe for Man”.

7.3 Restore all inspected areas to “As Found Condition” to include replacement and repair of insulation and lagging. All manhole covers shall be replaced with new gaskets.

7.4 Furnish the services of an ABS approved Non-Destructive (NDT) Services Company to examine the following locations using 5X visual inspection in accordance with NAVSEA Technical Publication T9074-AS-GIB-010/271, is acceptable:

7.4.1 All locations identified in reference 2.1 and 3.1.2.

7.4.2 All Sea Chest foundations and supporting webbing; this can wait until sea chest removal.

7.4.3 All welds on Frames 7, 16, 24, 32, 41, 52, 70 only in the location of the Tunnel area 2-7-0 as identified in reference 2.2.

7.4.4 All welds on the Lateral Frame 70, on the Mission Bay 01 Deck - Port and Starboard, including the outboard side of the Mission Bay bulkheads on Frame 70 inside the main engine room vestibule. Mission Bay locations are behind CBG panels on the inboard side.

7.4.5 All welds supporting both Port and Starboard Fuel Oil Service Tanks including I beams and lateral connections to vertical structural members beneath Service Tanks.

7.4.6 All welds of the underside of each Flight Deck Tie Down cup from the overhead of the Mission Bay.

7.4.6.1 This will need to be coordinated in conjunction with Work Item 0102 Mission Bay CBG Panel and Scupper Inspections.

7.4.6.2 Contractor shall assume to remove, label, store, etc. (as described in WI 0102) all panels under the Flight Deck.

7.4.7 All welds for the Mission Bay main stanchions, including gussets and structural I-beams with both lateral and longitudinal welds above stanchions. This needs to be coordinated with Work Item 0102.

7.4.8 Where applicable, inspect and report condition of paint coatings.

7.5 Record the results of the inspections.

7.5.1 Deficiencies shall be by digital photograph and documented by location description and finding.

7.5.2 Provide an electronic copy of the completed document with photographs to MSCREP.

8.0 GENERAL REQUIREMENTS:

8.1 This work item must be completed within fifteen (15) days after the first day of the yard period.

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