UltrasonicGauging-IntermediateHullSurveyNo5-SOW.doc

USNS PATUXENT

(T-AO 201)

20 April 2018

ULTRASONIC THICKNESS GAUGING – INTERMEDIATE HULL SURVEY NO.5 (ABS & USCG)

1.0

ABSTRACT

1.1 An ABS approved ESP Hull Gauging firm shall take and record 40,000 ultrasonic thickness readings on ship's hull, bulkheads, deck plating, scantlings, piping, and in other areas throughout the ship as required by the MSCREP, USCG, and ABS Surveyor. The requirements of the ABS Intermediate Hull Survey No.5 for Double Hull Tankers in the Enhanced Survey Program shall form the basis for this item.

2.0

REFERENCES/ENCLOSURES:

2.1 References:

2.1.1 NAVSEA Dwg No. 101-6580055, General Arrangement Outboard Profile.

2.1.2 NAVSEA Dwg No. 101-6581211, General Arrangement Inboard Profile.

2.1.3 NAVSEA Dwg No. 101-6580164, Scantling Plan

2.1.4 NAVSEA Dwg No. 101-6580165, Scantling Sections

2.1.5 NAVSEA Dwg No. 101-6580820, Shell Expansion TAO Double Hull.

2.1.6 NAVSEA Dwg. No. 101-6581216, General Arrangement of Tanks and Flats, Fwd. Fr. 60

2.1.7 NAVSEA Dwg. No. 101-6580059, General Arrangement of Tanks and Flats, Aft Fr. 60 2.1.8 NAVSEA Dwg. No. 101-6581214, General Arrangement Double Bottom (201, 204 and 203) 2.1.9 NAVSEA Dwg. No. 801-6580572, Capacity Plan (TAO-201 ONLY)

2.1.10 NAVSEA Dwg. No. 631-6580108, MSC “Paint Schedule” (Available onboard) 2.1.11 ABS Rules for Building and Classing Steel Vessels, Part 7, Rule Requirements for Survey After Construction Part 7, Chapter 3 Section 2. Tanker ESP (requirements for Intermediate Hull Survey No.5).

2.1.12 ESP PROGRAM_ Intermediate Hull Survey No.5 – PATUXENT (T-AO 201).

2.2 Enclosures: None

3.0

ITEM LOCATION/DESCRIPTION

3.1 Location/Quantity:

3.1.1 Location: Various locations throughout the vessel.

3.1.2 Quantity: 40,000 UT Readings

4.0

GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE:

None.

5.0

NOTES

5.1 Period of Performance:

2 July 2018 through 15 July 2018 5.2 Location:

Craney Island Fuel Depot, Portsmouth, VA 5.3 Point of Contact:

Brendan Donovan Phone

(757) 439-5292 5.4 The attending ABS Surveyor shall specifically approve the firm selected to perform the gauge readings. Thickness measurements are to be carried out by a qualified company certified by the American Bureau of Shipping as an ABS approved ESP Hull Gauging Firm and under the supervision of the ABS Surveyor.

5.5 A copy of ABS certification shall be provided to Port Engineer and ABS Surveyor prior to start of work. The qualifications of the ABS approved ESP Hull Gauging Firm shall be provided to the MSCREP prior to the start of the audio gauging.

5.6 All audio gauging equipment shall be acceptable for use by the American Bureau of Shipping.

5.7 ABS Surveyor will recheck the measurements as deemed necessary to ensure acceptable accuracy.

5.8 NOTE: On a daily basis a copy of the Thickness Measurements taken on each given day will be turned over to the MSCREP for local attending ABS Surveyor review.

5.9 Detailed Unit Structural Drawings can be provided by MSC Tech Library upon request.

6.0

QUALITY ASSURANCE REQUIREMENTS

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

7.0

STATEMENT OF WORK REQUIRED

7.1 Obtain and record 40,000 ultrasonic thickness gaugings to satisfy the requirements of ABS Intermediate Hull Survey No.5 for Double Hull Tankers in the Enhanced Survey Program. Accomplish the Thickness Measurements (UT Gauging) in the ballast tanks, cargo tanks, miscellaneous tanks and locations listed in reference 2.1.12 in the presence of the ABS Surveyor(s) and Port Engineer as required in accordance with reference 2.1.11 and reference 2.1.12.

7.1.1 The gaugings shall be taken during performance period at Craney Island Fuel Depot from 2 July 2015 through 15 July 2015. The gaugers shall be available to obtain gaugings during the duration of this performance period.

7.1.2 Thickness measurements are to be carried out by a qualified Thickness Measurement Firm certified by the American Bureau of Shipping as an ABS approved ESP Hull Gauging Firm.

7.1.3 Assistance to the Thickness Measurement Firm for access to the areas and/or structure to be gauged will be accomplished via ladders and rafting support for which shall be provided by a separate Service Order with a general ship repair contractor.

7.1.4 Contractor shall accomplish the thickness measurements in the areas and/or structure to be gauged in No.3 Port and Stbd Salt Water Ballast Tanks via alternate method as tank configuration limits access via rafting and ladders.

7.1.5 The gauging instruments shall be calibrated on site with certified blocks acceptable to the ABS Surveyor.

7.1.6 The contractor is to provide a unit price per shot up to a maximum of 40,000 Shots. Number of shots will be determined by quantity required by ABS. Unit price is to be used for decreasing the scope of the item as it relates to the number of shots required by ABS.

7.1.7 On a daily basis a copy of the Thickness Measurements taken on each given day will be turned over to the MSCREP and local attending ABS Surveyor for review.

7.2 After completion of all thickness measurements required, a final typewritten report is to be prepared in ABS acceptable format in accordance with ABS Rules and Regulations and to the satisfaction of Local ABS Surveyor. Contractor shall provide five (5) copies of the final report. Three (3) copies are to be submitted to the ABS Surveyor, one (1) copy shall be submitted to the Port Engineer, and one (1) copy is to be submitted to the Vessel’s Master. The final report shall give the location of measurements, the thickness measured as well as the original thickness, maximum allowable wastage and the actual percentage of wastage. The measuring equipment type, calibration certification and names of the persons taking the measurements and their qualifications shall also be included in the report.

7.2.1 Contractor shall submit final reports to the MSCREP within five (5) calendar days of completion of the ultrasonic readings.

7.3 The contractor shall develop and include in its report a composite drawing of location of each reading in relation to the frame numbers, seams and butt welds, plating, and internal structural members.

7.4 Contractor shall take thickness measurements in all locations detailed in reference 2.1.12 and summarized as follows;

- Suspect areas throughout the vessel (as designated by attending ABS Surveyor) as directed by the Port Engineer and ABS Surveyor.

- All main deck plating within the cargo area, all exposed main deck plating outside of cargo are and all exposed 1st tier super-structure deck plating (poop, bridge, and forecastle decks).

- A minimum of three (3) transverse sections, including at least one (1) in way of a ballast tank, within the amidships 0.5L.

- All plating in two (2) wind-and-water strakes (port and starboard full length).

- Internals in forepeak and aftpeak tanks (including plating and stiffeners of tank bulkheads).

- Dect Keel or pipe tunnel plating and internals.

- All Keel and bottom plating (full length).

- Plating of seachests. Shell plating in way of overboard discharges as considered necessary by the attending Surveyor.

- Measurements, for general assessment and recording of corrosion patterns, of structural members subject to Close-up Survey.

- All web frames in all ballast tanks.

- All web frames in one (1) cargo tank.

- One (1) web frame in remaining cargo tanks.

- All transverse bulkheads in all cargo tanks.

- All transverse bulkheads in all ballast tanks.

- Additional transverse areas as deemed necessary by the Surveyor

7.5 Painting

7.5.1 The Contractor shall repair all intact coatings disturbed during the accomplishment of this work item. The disturbed areas shall be coated with the systems specified in reference 2.1.10 using the paint product data sheets for surface preparation, environmental condition requirements, and dry film thickness. Paint will be provided by ships force.

8.0 GENERAL REQUIREMENTS: None additional.