0112_B_NO_1_BALLAST_TANK_FORWARD_STEEL_REPAIRS_-_Revision_A.doc

USNS MERCY

(T-AH 19)

HULL STRUCTURE

N32205-15-R-5000

15 MAY 2015

ITEM NO. 112

Category “B”

MSC/DESIMONE

ADD 1

NO 1 BALLAST TANK FORWARD STEEL REPAIRS

1.0 ABSTRACT:

1.1 This work item describes the requirements to accomplish steel repairs in the No. 1 Forward Ballast Tank.

2.0 REFERENCES:

2.1 ABS Rules for Building and Classing Steel Vessels

2.2 NAVSEA Dwg. No. 5980056, Scantling Plan

2.3 NASSCO PLAN No. 390-800-022, Scantling Sections

2.4 NASSCO PLAN No. 390-800-025, Shell Expansion

Scantlings

2.5 NAVSEA Dwg. No. 5981321, Paint Schedule

3.0

ITEM LOCATION/DESCRIPTION:

2.6 Location/Quantity:

2.6.1 Location: No. 1 forward ballast

tank (7-23-0)

2.6.2 Quantity: As designated in

paragraph 7.0.

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/INFORMATION:

4.1 Government Furnished Material (GFM)

AMERCOAT 240 Off White

80 gals

AMERCOAT 240 BUFF

AMERCOAT 240 RED

DIMETCOTE 302H

30 gals

T-10

30 gals

4.2 Government Furnished Services (GFS):

A PPG Paint Field

Service Representative will be on site to offer technical assistance to the MSCREP.

5.0

NOTES:

5.1 The contractor and all subcontractors, regardless of

tier, must consult the General Technical Requirements 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 29.

5.2 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 definitions relating to the performance of this work item are found in Work Item 001.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 All Inspections and tests shall be performed in the presence of contractor’s representative, MSFSC REP, ABS Surveyor and USCG Inspector, as applicable. Notify the MSCREP, USCG Inspector and the ABS Surveyor 24 hours prior to the scheduled inspections and tests.

6.2 Contractor shall submit welder qualifications and welding procedures to the Port Engineer for ABS review and approval prior to welding.

6.3 All weld repairs shall be accomplished by an ABS

certified welder.

7.0

STATEMENT OF WORK REQUIRED:

7.1 Crop out and renew damaged or deteriorated structural steel plate and shapes in designated areas of the vessel, using references 2.1 – 2.5 for guidance. Install steel in way of removals, templating sizes and shapes from existing configuration. All welding shall be continuous. Sections in way of steel removals shall be temporarily supported so that no damage or deformation occurs to existing steel. Steel plate and shapes to be renewed are specified in the paragraphs below.

NOTE: ABS Recommendation 612 applies

1. Port side SSL No. 35 bracket at FR 33, flange wasted (12” x 17.85# x 24” long) 88 lbs

2. Port side SSL No. 31 bracket at FR 33, flange wasted (12” x 17.85# x 24” long) 88 lbs

3. Port side SSL No. 28 bracket at FR 33, flange wasted (12” x 17.85# x 24” long) 88 lbs

4. Port side SSL No. 26 bracket at FR 33 flange wasted (12” x 17.85# x 60” long) 218 lbs

5. Port side FR 34 horizontal stiffener at SSL No. 36 wasted (12” x 4” x 17.85# x 96”” long) 244 lbs

6. Port side FR 34 horizontal stiffener at LBL No. 36 wasted (12” x 4” x 17.85# x 96”” long) 244 lbs

7. Port side FR 35 wasted IWO SSL Nos. 38 to 37 (Clad weld pits up to 1 sqft 3 passes.)

8. Port side FR 35 horizontal stiffener at SSL No. 36 flange wasted (12” x 4” x 17.85# x 96”” long) 244 lbs

9. Port side FR 35 horizontal stiffener at LBL No. 36 flange wasted (12” x 4” x 17.85# x 72”” long) 244 lbs

10. Port side FR 35 trans. Girder IWO SSL Nos. 33 and 32, flange wasted (4” x 20.4# x 120” long) 648 lbs

11. Port side FR 35 horizontal stiffener at LBL No. 32 wasted (Clad weld pits up to 1 sqft 3 passes.)

12. Port side Long. Bulkhead, FRs 33-1/2, SSL Nos. 35 to 36 wasted (Clad weld pits up to 1 sqft 3 passes.)

13. Port side Long. Bulkhead FRs 34 to 35-1/2, SSL Nos. 34 to 33 wasted (6’ x 4’ x 17.85# insert) 348 lbs

14. Port side Long. Bulkhead FRs 35 to 36, SSL Nos. 30 to 28 wasted (Clad weld pits up to 1 sqft 3 passes.)

15. Port side LBL No. 36, FRs 33-1/2 to 34-1/2, flange wasted (4” x 17.85# x 36” long) 28 lbs

16. Port side LBL No. 35, FRs 34 to 34-1/2, flange wasted (4” x 17.85# x 24” long) 148 lbs

17. Port side LBL No. 35, FR 36, flange wasted (4” x 17.85# x 24” long) 98 lbs

18. Port side LBL No. 37, FR 34, flange wasted (4” x 17.85# x 24” long) 98 lbs

19. Stbd side SSL No. 37 bracket at FR 33, web wasted (Clad weld pits up to 1 sqft 3 passes.)

20. Stbd side SSL No. 35 bracket at FR 33, flange wasted (4” x 17.85# x 24” long) 88 lbs

21. Stbd side SSL No. 34 web at FR 33 wasted (Clad weld pits up to 1 sqft 3 passes.)

22. Stbd side LBL No. 33 bracket at FR 33, web wasted (Clad weld pits up to 1 sqft 3 passes.)

23. Stbd side SSL No. 28 bracket at FR 33 flange wasted (4” x 17.85# x 24” long) 48 lbs

24. Stbd side SSL No. 27 flange at FR 33 wasted (12” x 17.85# x 72” long) 248 lbs

25. Stbd side LBL No. 26 bracket at FR 33, flange wasted (Clad weld pits up to 1 sqft 3 passes.)

26. Stbd side FR 34 wasted at SSL Nos. 37 to 38 (Clad weld pits up to 1 sqft 3 passes.)

27. Stbd side FR 34 horizontal stiffener at SSL No. 36 wasted (4” x 17.85# x 36” long) 338 lbs

28. Stbd side FR 34 horizontal stiffener at LBL No. 30 wasted (4” x 17.85# x 48” long) 448 lbs

29. Stbd side FR 34 trans. Girder IWO SSL Nos. 33 and 32, wasted at upper flange (12” x 4” x 17.85# x 36” long) 458 lbs

30. Stbd side FR 34 trans. Girder IWO SSL Nos. 28 and 27, upper flange wasted (8” x 20.4# x 48” long) 648 lbs

31. Not used.

32. Stbd side FR 35 underdeck lap plate at the side-shell wasted (Clad weld pits up to 1 sqft 3 passes.)

33. Stbd side FR 35 wasted at SSL Nos. 38 to 37 (Clad weld pits up to 1 sqft 3 passes.)

34. Stbd side FR 35 horizontal stiffener at SSL No. 36 wasted (4” x 17.85# x 96” long) 684 lbs

35. Stbd side FR 35 horizontal stiffener at LBL No. 36 wasted (4” x 17.85# x 96” long) 684 lbs

36. Stbd side FR 35 trans. Girder IWO SSL Nos. 33 and 32, upper flange wasted (4” x 20.4# x 144” long) 938 lbs

37. Stbd side FR 35 horizontal stiffener at LBL No. 32 wasted (4” x 20.45# x 96” long) 838 lbs

38. Stbd side FR 35 horizontal stiffener at LBL No. 30 wasted (4” x 17.85# x 96” long) 438 lbs

39. Stbd side FR 35 horizontal stiffener at SSL No. 30 wasted (4” x 17.85# x 96” long) 438 lbs

40. Stbd side Long. bulkhead FRs 33 to 36, SSL Nos. 33 to 35 wasted (Clad weld pits up to 1 sqft 3 passes.)

41. Stbd side Long. bulkhead FRs 33 to 35, SSL Nos. 27 to 29 wasted (Clad weld pits up to 1 sqft 3 passes.)

42. Stbd side LBL No. 37, FRs 33 to 36 wasted (4” x 17.85# x 72” long) 538 lbs

43. Stbd side LBL No. 36, FRs 33 to 36 wasted (4” x 17.85# x 132” long) 738 lbs

44. Stbd side LBL No. 35, FRs 33 to 36 wasted (4” x 17.85# x 288” long) 1,138 lbs

45. Stbd side LBL No. 34 FRs 33 to 36 wasted (4” x 17.85# x 288” long) 1,138 lbs

46. Stbd side LBL No. 31 FRs 34 to 36, web wasted (Clad weld pits up to 1 sqft 3 passes.)

47. Stbd side LBL No. 30 FRs 35 to 36 wasted (Clad weld pits up to 1 sqft 3 passes.)

48. Stbd side LBL No. 29 FRs 35 to 36 wasted (Clad weld pits up to 1 sqft 3 passes.)

49. Stbd side LBL No. 28 FRs 33 to 36 wasted (4” x 17.85# x 192” long) 938lbs

50. Stbd side LBL No. 27, wasted at FR 33 and FR 35 (Clad weld pits up to 1 sqft 3 passes.)

51. Stbd side LBL No. 26, FR 36 wasted (Clad weld pits up to 1 sqft 3 passes.)

52. Stbd side LBL No. 25, FR 36 wasted (Clad weld pits up to 1 sqft 3 passes.)

7.2 Preparation of Drawings: Prepare and submit to the ABS Surveyor for approval, sketches of intended plate and shape replacement complete with material identification and welding details. Provide copies of the ABS approved sketches to the Port Engineer, prior to commencing steel renewals.

7.3 Inspection/Test: Accomplish non-destructive testing (NDT) of new steel work and welds to the satisfaction of the ABS Surveyor. NDT methods shall include X-Ray Magnetic Particle and /or Dye Penetrant examination of the welds as well as internal or external 120 psi hose testing where required.

7.4 Mechanically clean, prime and paint new and disturbed surfaces (see 7.5 for new steel) to match surrounding surfaces, using reference in Reference 2.5 as guidance.

7.4.1 Mechanically clean to SSPC-SP-11 1.5 mil

profile minimum to all new and disturbed areas.

7.4.2 Apply one spot of Ameron 240 to achieve 6

mils dft to all mechanically cleaned areas

7.4.3 Apply one full coat of Ameron 240 to

achieve 6 mils dft to all spot coated areas

7.5 Sandblast, prepare, prime and paint new steel.

7.5.1 Sandblast to SSPC-SP-10.

7.5.2 Apply one full coat of Ameron 240 to

achieve 6 mils to all new steel.

7.5.3 Apply 2nd full coat of Ameron 240 to achieve

6 mils

8.0 GENERAL REQUIREMENTS: None Additional

112-6