RFC_016_response.pdf

N3220518R4008

USNS HENRY J. KAISER (T-AO 187)

ATTACHMENT J - 8

REQUEST FOR SPECIFICATION CLARIFICATION

RFC 016

NAME OF CONTRACTOR: Mare Island Dry Dock, LLC

SPECIFICATION ITEM NO.: 107

PARAGRAPH / SECTION NO: 1.1, 2.1.1, 6.1, 7.1.1, 7.1.2 a, b, c, f

TITLE: AFFF SPRINKLER PIPING REPLACEMENT

QUESTION:

1.1 This item describes replacing all existing main deck carbon steel AFFF piping and fittings (2 ½” and below) and internal cleaning of piping above 2 ½” (frame 31-51).

* We recently received 2.1.1 MSC Drawing # 555-6580704 Foam System Diagram and noted the material in this Diagram is CUNI and not carbon steel as stated in 1.1.

Is there an actual DWG for this item with a material list that shows the sprinkler connections also?

Is it the Government’s intent to replace steel with Code 6 CUNI?

6.1 Install all piping in accordance with 2.1 and the applicable rules and regulations of the USCG and ABS?

7.1.1 Mechanically disconnect, remove and clean to bright metal all sprinkler heads affected by this work item using Reference 2.1 sheets 3 and 4 as guidance.

Sprinkler heads shall not be blasted in the cleaning process. Retain the sprinkler heads for reinstallation in 7.3.2.b below.

* There is no 7.3.2 in this specification.

7.1.2 a. Install new AFFF piping (2 ½” and below), valves and associated fittings templating from the existing configuration and locations, using Reference 2.1 as guidance.

* 2.1 is CUNI and existing is carbon steel

Is it the Government’s intent to replace steel with Code 6 CUNI?

N3220518R4008

USNS HENRY J. KAISER (T-AO 187)

ATTACHMENT J - 8

7.1.2 b. Install sprinkler heads removed in 7.3.1.a above, using Reference 2.1 sheets 3 and 4 as guidance. Connect sprinkler head to the system using ½” couplings retained from original installation.

There is no 7.3.1 above 7.1.2. The Diagram shows Code 6 CUNI and existing material is carbon steel. Spec states to reuse couplings retained from original installation.

Are the original couplings steel and put into a CUNI system?

7.1.2 c. Replace with new orifices FF-OR002 and FF-OR003 in 2.1, one each with the following openings: 3 ¾” and 3 7/8”.

Pipe replacement in this item is 2 ½ ‘and below. Are these orifices’ correct?

7.1.2 f. New piping returned to the ship shall be blasted and primed prior to installation.

Does the Government want the CUNI Piping blasted and primed prior to installation?

ANSWER:

henry.robson Typewritten Text MSC does not intent to replace CUNI piping, item has been revised to reflect.

henry.robson

7.3.2 removed from Para 7.1.1.a

7.1.2 Para revised to reinstall AFFF removed.

All AFFF material is CUNI, if piping has to be cut contractor will need to use CUNI coupling to rejoin piping.

All orifices are correct, for orifices removed.

All piping remove shall be blasted and painted, as per item.

See Revised Item henry.robson Typewritten Text