0501 - MDS Modification

USNS SIOUX

T-ATF 171

DRYDOCKING

CONTRACT NO.

ITEM NO. 0501

CATEGORY “A”

6/15/2010 MSD Modification

/Satcher/KS

1.0 ABSTRACT:

1.1 This SOW provides guidance to modify existing MSD installation/piping and installed GFM macerator pump.

2.0 REFERENCES:

2.1 MSC Standard Drawing 803-7080803; Preparation of Computer Aided Design (CAD) Drawings for USNS Ships.

2.2 MSC Standard Drawing 803-7081122; Military Sealift Command General Technical Requirements (GTRs).

2.3 MSC Drawing No. 593-484658, Sewage Treatment System

2.4 Severn Trent De Nora Dwg No. STDN-12MC-F-01 Rev. 2.

2.5 Severn Trent De Nora Dwg No. STDN-12MC-P-01 Rev. 2

2.6 MSC Drawing 4842949, T-ATF CHT Treatment Rev. H.

2.7 MSC Drawing 6248358, T-ATF Sewage and Draining System Modifications Rev. -.

3.0 ITEM LOCATION/DESCRIPTION:

3.1.1. Lower Pump Room

3.1.2. MSD Unit Model 12MX

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES/INFO: None

5.0 NOTES: None

6.0 QUALITY ASSURANCE REQUIREMENTS: Refer to item 0004

7.0 STATEMENT OF WORK:

7.1 Rip out and Installation:

7.1.1. Clean, gas free and sanitize the Collection Holding Tank and Transfer (CHT) Tank, CHT overboard discharge line including all three lift stations including the discharge lines to CHT overboard header and the Fuel Oil Tank located below the MSD Skid installation site.

7.1.2. Clean, gas free #1 and #3 Fuel Oil tanks.

7.1.3. Remove existing piping from the V-1 Tank Sewage Inlet piping connections to the piping tie-in branch connection. Connection to ship’s piping shall be provided with a means of system pressure isolation and pipe cap.

7.1.4. Remove existing pipe connection at the V-1 Tank 3” Clean out connection. This pipe run is currently connected to the CHT Overboard pumps suction header.

7.1.5. Blank off 3” Clean out connection with ANSI B16.1 blind flange.

7.1.6. Remove piping up to installed isolation valve.

7.1.7. Provide a 4” sanitary inlet pipe connection to the MSD installation site V-1 Tank Inlet.

7.1.8. All PVC piping materials and fabrication shall comply with ABS SVR 4-6-3.

7.1.9. All PVC shall comply with IMO A.653(16) and ASTM D2444.

7.1.10. All metallic piping material and fabrication shall comply with ABS SVR 4-6-1 and 2-4-4 and installed to the satisfaction of the attending ABS Surveyor.

7.1.11.

All welding and fabrication of piping must comply with ABS SVR 2-4-4 including ABS qualified welders and ABS approved welding procedure.

7.1.12. A Valve and will be installed in the piping run upstream of the MSD Vender supplied macerator pump.

7.1.13. Use Existing Valve already installed as macerating pump suction isolation.

7.1.14. The 4” sanitary branch will be branched off the CHT Holding tank sanitary pumps suction header. The piping will connect to the MSD system macerator pump supplied by the MSD vendor.

7.1.15. 4” sanitary branch piping material shall be MIL-T-16420 CUNI 90:10 to match existing suction header piping material.

7.1.16. Macerator pump suction connection is a 4” Flat Faced ANSI B16.1 PVC Flange.

7.1.17. Macerator pump discharge connection is a 1” Flat Faced ANSI B16.1 PVC Flange

7.1.18. Macerator discharge pipe will run from the macerator pump to the V-1 Tank Inlet connection will connected to the V-1 tank inlet connection.

7.1.19. Connection to V-1 Tank is a 4” Flat Faced ANSI B16.1 PVC Flange.

7.1.20. Pipe material may be CUNI 90:10 or PVC.

7.2 Manufacturer's Representative: Contractor to provide an OEM technical representative to provide guidance during the modification and to commission the unit, once repairs are complete. Suggested source is Severn Trent De Nora

8.0 GENERAL REQUIREMENTS: None

NewPengCons

- 1 -