0107__ULTRSONIC_THICKNESS_GUGING_Specifiction_(Rev_1).doc.doc

USNS SPEARHEAD

( EPF 1 )

1.0

ABSTRACT

1.1 Take and record ultrasonic thickness readings on ship's hull, bulkheads, deck plating, scantlings, piping, and in other areas throughout the ship as required by ABS. The requirements of the ABS Special Survey for T-EPF shall be the basis of these requirements.

2.0

REFERENCES/ENCLOSURES

2.1 References:

2.1.1 NAVSEA Dwg. No. 8443364_F General Arrangement 2.1.2 NAVSEA Drawing 8442868, Material List

2.1.3.

NAVSEA Drawing 8442920, Forward Ride Control Foundation Details

2.1.4.

NAVSEA Drawing 8442785, Molded Lines and Offsets

2.1.5.

NAVSEA Drawing 8442880, Welding Details 2.1.7.

NAVSEA Drawing 8442878, Standard Structural Details

2.1.8.

NAVSEA Drawing 8442883, Structural Side Plate & Stringer Details

2.1.9.

NAVSEA Drawing 8442885, Structural Plan Tank Tops & Inner Bottom

2.1.10.

NAVSEA Drawing 8442888, Typical Structure Frames Hull Void 8-24

2.1.11.

MSC Drawing No. 803-7081122, MSC General Technical Requirements (GTR)

2.1.12 SPD Paint Schedule 9_27_13

2.2 Enclosures: None.

3.0

ITEM LOCATION/DESCRIPTION

3.1 Location:

Various locations throughout the vessel.

3.2 Quantity:

Approx. Forty-thousand (40,000) readings

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 GTR’s.

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 001.

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

6.0

QUALITY ASSURANCE REQUIREMENTS

6.1 All work performed shall be to the satisfaction of the ABS, Port Engineer and the Chief Engineer.

7.0

STATEMENT OF WORK REQUIRED

7.1 Provide all labor, materials, lifts, staging, and equipment as required to obtain ultrasonic thickness readings using references 2.1.1 through 2.1.11 for guidance.

7.2 Provide services of an ABS Certified Audio Gauging Company to accomplish ultrasonic thickness readings.

7.3 Obtain and record a total of approximately forty-thousand (40,000) ultrasonic thickness readings as follows:

7.3.1 Thickness measurements shall be taken:

a. All main deck plating within the Mission Bay area.

b. All exposed main deck plating outside of the Mission Bay area (aft mooring stations)

c. All exposed Bow deck plating (FWD mooring stations)

d. On each of two side shell planking areas.

e. All keel and underwater hull plating, full length on port and stbd.

f. All sea chest plating and shell plating in way of overboard discharges as considered necessary by the attending ABS Surveyor.

7.3.2 Thickness measurements shall to be taken on any additional suspect plating or structure as considered necessary by the attending ABS Surveyor(s).

7.4 Provide daily status reports of the ultrasonic readings taken the previous day. One (1) copy of each report shall be provided to the MSCREP and the Attending ABS Surveyor(s). These reports shall detail the number of ultrasonic readings taken and the locations from which they were taken.

7.5 Prepare a preliminary report of the non-destructive testing for review and approval by the ABS and the MSCREP. Five (5) copies of the report are to be submitted to the MSCREP within five (5) calendar days of completion of the ultrasonic readings.

7.6 After review and approval of the preliminary report by the ABS and the MSCREP, prepare a final report of the non-destructive testing. Five (5) bound copies of the report shall be submitted to the MSCREP at least two (2) days prior to the vessel’s departure for sea trials.

7.7 The Contractor shall repair all coatings disturbed during the accomplishment of this work item. The disturbed areas shall be coated with the systems specified in reference 2.1.12 using the paint manufacturer’s product data sheets for surface preparation, environmental condition requirements, and dry film thickness for guidance.

7.8 Preparation of Drawings: In accordance with paragraphs 7.5 and 7.6.

7.9 Manufacturer's Representative: None.

8.0

GENERAL REQUIREMENTS:

8.1 None additional.

0107 - 213