0021_A_CLEAN_AND_GAS_FREE_TANKS_VOIDS_COFFERDAMS_AND_SPACE_REV_3.doc

USNS CHARLES DREW

(T-AKE 10)

GENERAL REQUIREMENTS

N32205-18-R-4252

24 DEC 2017

ITEM NO. 021

Category “A”

MSC/PO1B/REV FEB 14/SA

CLEAN AND GAS FREE TANKS, VOIDS, COFFERDAMS & SPACE

1.0 ABSTRACT:

1.1 This work item describes the requirement to open, clean, gas-free, maintain, and close miscellaneous tanks, voids, cofferdams, and spaces. Storage of re-usable fuel and lube oils is also required.

2.0 REFERENCES/ENCLOSURES:

2.1 References:

2.1.1 MSC Dwg 801-8498899, USNS CHARLES DREW Capacity Plan

2.1.2 MSC Dwg 801-8498940 REV B, USNS CHARLES DREW Trim and Stability Booklet

2.2 Enclosures:

2.2.1 USNS CHARLES DREW (T-AKE 10) List of Applicable Tanks, Voids and Cofferdams

3.0 ITEM LOCATION/DESCRIPTION: See Enclosure 2.2.1.

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 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, including but not limited to, GTR’s 1 through 7, 22, 23, and 29.

5.2 The contractor and all subcontractors, regardless of tier, are advised to review all other Work Items under this contract to determine their effect on the work required under this Work Item. Many of the definitions relating to the performance of this Work Item are found in Work Item 001.

5.3 In the event that any tank contents are deemed to be hazardous wastes in accordance with federal, state and local (CONUS) or international (OCONUS) standards, the costs for handling and disposal of those wastes shall be covered under work item 023 of this work package.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 Tank coating system conditions shall be identified and documented by the contractor during tank surveys. ABS surveyor shall receive a copy of contractor’s reports.

7.0 STATEMENT OF WORK REQUIRED:

7.1 It is the contractor’s responsibility to analyze and properly plan tank unloading procedures to ensure that no undue stresses are imposed on the vessel structure. Ship’s force and MSCREP will assist contractor with ship loading documents and software. The contractor shall utilize the services of a Naval Architect or structural engineer to support this planning. The contractor shall provide their tank unloading plan to the MSCREP at least 2 business days prior to starting this work to permit review and approval by MSC Naval Architect.

7.2 Contractor and Ships Force shall take, record, and verify soundings of all tanks listed in enclosure 2.2.1, on arrival at the contractor’s facility. Chief Engineer shall review and endorse all soundings taken/recorded. Submit copy of endorsed record to the MSCREP.

7.3 Removals:

7.3.1 The ship will pump down tanks to low suction, either to other tanks onboard or to shore storage facilities. In the event that the tank contents are being moved off the ship, the contractor shall provide support to the vessel, including all hoses and manpower on the shore side to accomplish this removal. Contractor shall be responsible to provide all pumps, hoses, fittings and personnel to safely remove all remaining tank contents as identified in enclosure 2.2.1. Applicable federal, state, local or international procedures for transferring fuel and lube oils over water shall be followed by the contractor. Contents to be temporarily stored are indicated in the enclosure. All other liquids shall be disposed of in accordance with local, state, federal and/or international regulations. In some states, the presence of oil in the wash water may deem the mixture to be hazardous waste. When pricing this item, the contractor shall assume that oil is present in the tank wash water. The cost for disposal of the mixture shall be included in the price quote regardless of whether or not, due to the presence of oil, the wash water is deemed hazardous waste or non-hazardous waste. If the mixture is determined to be hazardous waste due to some contaminant other than oil, the procedures outlined in Item 0023 shall be used for the identification, handling and disposal. The costs for removal are still part of this (WI 021) work item. All other costs for offload and disposal shall be captured in this work item.

7.4 Accomplish the following for each tank/space listed in enclosure 2.2.1:

7.4.1 Open manholes and erect/maintain safety guards over openings.

7.4.2 Temporarily provide blowers and ventilate tanks and spaces, inclusive of confined areas around manhole covers.

a. Ventilation of the tanks shall be accomplished so as to prevent tank fumes from exhausting in the interior compartments of the ship.

7.4.3 Temporarily provide and maintain, as required, tank lamping/lighting. Lighting shall be explosion proof, safety type lights.

7.5 Clean and Gas Free tanks and spaces listed in enclosure 2.2.1. Cleaning shall completely remove all traces of dirt, sludge, debris and liquids. All tanks and spaces shall be presented in a clean and dry condition and shall be ready to be certified and maintained “Safe for Men/Safe for Hot Work”. The provision of gas free certificates is covered under work item 020 of this work package.

7.5.1 Where a battery of tanks is designated for cleaning and gas freeing, all interior spaces in way of same, such as cofferdams, voids, bilges, bilge wells and other spaces, even if not specifically mentioned, shall be considered as being included as spaces to be cleaned and gas freed.

7.5.2 For all tanks and spaces indicated in enclosure 2.2.1, air vents, sounding tubes, filling and suction lines and other appurtances shall be included for cleaning and gas freeing. Secondary manhole covers for each tank shall also be opened.

7.5.3 Post Original Gas Free Certification at each Tank/Space Location. Certificate shall be mounted directly at the tank/space manhole entrance.

7.5.4 Post copy of Gas Free Certificates at the designated gangway access to the vessel. Certifications posted at gangway shall be in a protective weather/water proof enclosure that is accessible and visible.

7.6 Surveys and testing requirements for these tanks shall be addressed in other work items in this work package.

7.7 At the conclusion of all required work, conduct a final closeout inspection for each tank/space listed in enclosure 2.2.1 with the MSCREP. No tank shall be closed until a final inspection is accomplished with the MSCREP in attendance.

7.7.1 Contractor is responsible for repairing all tank coating damage caused by work in this solicitation work package. During close out inspection, if coatings are found damaged by contractor’s work, contractor shall repair damaged areas prior to final close out of tank/space, at contractor’s expense. Damaged coatings shall be repaired in accordance with MSC paint system and the paint representative’s recommendations.

7.7.2 Ensure all blowers, lighting, staging, tools, and miscellaneous equipment are removed prior to the final inspection. Any staging necessary for MSCREP close out inspection shall be removed just prior to final acceptance close out of tank/space.

7.7.3 Present Tank in “Final” clean condition. No dirt, dust, debris or liquids shall be allowed. Any tank or space failing the close out inspection, shall be re-cleaned until passing MSCREP inspection (repeated cleanings and inspections will be at contractor expense, and may become subject to issuance of a QDR).

7.8 Upon acceptance of final closeout inspection and by direction of the MSCREP, reinstall manhole covers using new gaskets, grommets, and wicking. Submit a Condition Found Report for any missing or damaged fasteners or hardware.

7.9 All tanks and spaces, included in enclosure 2.2.1, shall be opened, cleaned and prepared for gas free certification within seven (7) days of the shipyard availability start:

7.10 Required Deliverable Report:

7.10.1 Contractor shall create, maintain, update, and submit weekly during the progress meeting, a tank/space work matrix. This matrix shall contain the following information:

a. Tank/Space Name

b. Tank/Space Location Designation

c. Date Tank/Space Opened

d. Date Gas Free Cleaning Started

e. Date Gas Free Cleaning Completed

f. Date Gas Free Cert. Received

g. Date ABS Initial Structural Survey Completed

h. Date Air Test/Hydro Test Completed

i. Date Final Tank/Space Cleaning Started

j. Date Final Tank/Space Cleaning Completed

k. Date Tank/Space Final Close

l. Tank/Space Related Repair Status: List major job sequence within a tank/space followed by date start & date completed (such as below):

i. Access Cuts – Dates Started/Completed

ii. Blasting – Dates Started/Completed

iii. Painting – Dates Started/Completed

iv. Related Work Items Internal Repairs (pipe, valve, structure, etc)

v. Related Work Items External Repairs (welding, UT’s, zincs, other structural related; etc.)

vi. Fluids added/removed from tank/space (potable water chlorination; Undocking Stability; fuels/oils; etc)

m. Other

7.11 Paint all disturbed surfaces to match surroundings.

7.12 Preparation of Drawings: None.

7.13 Manufacturer's Rep: None.

8.0 GENERAL REQUIREMENTS: None additional.

ENCLOSURE 2.2.1

USNS CHARLES DREW (T-AKE 10)

TANKS, VOIDS, AND COFFERDAMS

NOTE: Tank Arrival Conditions are estimates only.

(gals) Arrival

Condition

(gals)

(4-79-4)

021-2