Statement_of_Work_18Q0373.docx

Dry Dock #1 Pure Water Facility Portsmouth Navy Shipyard, Kittery ME

PURE WATER STORAGE VESSELS 08/18

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASME INTERNATIONAL (ASME)

ASME B16.5 (2017) Pipe Flanges and Flanged Fittings: NPS 1/2 Through NPS 24 Metric/Inch Standard

ASME BPVC SEC IX (2017) BPVC Section IX-Welding and Brazing Qualifications

ASME BPVC SEC VIII D1 (2017) BPVC Section VIII-Rules for Construction of Pressure Vessels Division 1 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 7005-2 (1995) Metallic Flanges Part 2: Cast Iron Flanges

1.2 ADMINISTRATIVE REQUIREMENTS

1.2.1 Preconstruction Requirements

1.2.1.1 Fabrication Drawings

Submit fabrication drawings for horizontal cylindrical 316L stainless steel storage vessels, including construction and support details, 30 days prior to start of fabrication.

Drawings shall show the locations of weld seams, sizes and types of welds, piping arrangements, nozzle reinforcement, method of nozzle attachment, plate and head thicknesses, vessel weights, details of lifting lugs, manways, details required for fabrication of the vessels, and a complete list of materials. Include Design Calculations for vessels with the drawings, including chemical composition and mechanical properties of the steels used, and including reference to ASME BPVC SEC VIII D1.

Clearly show on drawings:

a. Locations of platform supports, allowable load at each support, and external reinforcement if required. Show locations of all factory installed nozzles and connections.

1.3 SUBMITTALS

Test

Test reports for liquid penetrant, magnetic particle, and hydrostatic tests performed to prove compliance with specified criteria, upon completion and testing of the installed system.

Procedure for Welding Vessels

Certified copies of performance test records indicating that the welders have passed qualification test in conformance with ASME BPVC SEC IX, prior to work on piping or vessel fabrication. Each welder shall be qualified for the position and type of material assigned.

PART 2 PRODUCTS

2.1 STAINLESS STEEL VESSELS

Provide horizontal cylindrical 316L stainless steel vessels and accessories conforming to loading conditions specified herein and as indicated on the drawings. Maximum allowable carbon content is 0.08 percent. vessels shall be in accordance with ASME Section VIII.

Manufacturer must provide certification of compliance that: "For ALL hardware, contact between final (wetted) surfaces and mercury, mercury compounds, low melting point metals (antimony, bismuth, cadmium, lead, tin, and zinc), and alloys of these metals was prohibited"

Vessels shall be designed to withstand complete vacuum plus loads as indicated on the drawings. Reinforcement, if required, shall be external to the vessels. Locate any reinforcement so that existing pure water piping can be connected by the Government in its' existing location without modification. The vessels have very limited space in which to be placed.

Locate any reinforcement so that vessels may be placed as indicated on the drawings without interference.

2.1.6 Supports and Attachments

Structural steel for supports or structural attachments shall conform to requirements specified for vessel or to ASTM A 36/A 36M. Where legs of ASTM A 36/A 36M steel are attached to stainless steel vessels, pads of ASTM A 240/A 240M steel shall be used to make the attachment.

2.2 DESIGN AND FABRICATION

Design and fabrication of vessels shall conform to ASME BPVC SEC VIII D1, except as modified herein. Vessels shall be welded cylinders or spheres, seamless cylinders, or cylinders of multiple-layered or banded construction. Vessels shall be suitable for stationary, aboveground horizontal installation, exposed to atmospheric elements. Capacities of vessels shall be as shown. Submit complete calculations.

2.2.1 Design Pressure

Vessels shall be designed for a pressure of 0 psig.

2.2.2 Design Temperature

Vessels shall be designed for a temperature range of plus 120 to minus 40 degrees F.

2.2.3 Nozzles

2.2.4 Structural Attachments

Permanent structural attachments, including lifting lugs and erection brackets, shall not be welded to vessel parts subject to pressure stress, unless otherwise approved. If approved, such welds shall be full penetration and shall have welded layers inspected progressively by the magnetic particle method. No welding shall be performed after final stress relief or hydrostatic testing.

2.2.5 Shell and Head Thickness

Shell and head thickness shall be calculated in conformance with ASME BPVC SEC VIII D1.

2.2.6 Procedure for Welding Vessels

2.2.6.1 Weld Layer Thickness

Individual layer thickness of production welds shall not exceed 1.1 times that of individual layer thickness deposited in the performance qualification.

2.3 CAPACITY AND DIMENSIONAL REQUIREMENTS

Provide 5000-gallon nominal capacity vessels as indicated on the drawings.

2.3.1 Liquid Level Gauge

Provide tank with liquid level armored gauge glass sight tube with flanges, indicating 5 to 90 percent of tank capacity.

2.4 TANK CONSTRUCTION REQUIREMENTS

a. The vessels must have final interior finish at all locations with a surface roughness of 125µinches RA (rough average) or smoother.

b. The surface must not snag a cleanliness cloth while performing a swipe test. See "Inspection" paragraph below. Construction must not result in any internal crevices or discontinuities or inward projections.

c. Provide tank with bracketed flat surfaces for identification plate, and liquid-level gage. The identification plate shall indicate the allowable pressure of the vessels.

d. The new vessels shall be used to support the new steel mezzanine framing. Provide stainless steel supports for mezzanine framing as indicated on the drawings. Ensure that a galvanic barrier is placed between the stainless steel support plates and the carbon steel framing.

2.5 ACCESSORIES

2.5.1 Flanged Manways

Provide stainless steel top-flanged manway.

Conform flange diameter and drilling to ASME B16.5, ISO 7005-2, 150 pounds per square inch.

2.5.2 Removable Cover

Provide flat style cover, with lifting ring at center of cover.

PART 3 EXECUTION

3.1 HYDROSTATIC TEST

Perform in-factory hydrostatic tests witnessed by the Government to determine if leak proof storage is provided, and correct deficiencies.

Submit written manufacturer's field reports of all test data made at the job site for review and final approval no later than 30 calendar days prior to contract completion. Repair or replace unsatisfactory vessels and retest at no additional cost to the Government until leak proof systems are obtained.

3.2 INSPECTION

associated for additional site visits to the factory by the Government for acceptance testing shall be paid for by the Contractor.

Visual inspection: shall be performed without magnification verifying that critical surfaces are free of foreign material. Discrete lint fibers less than 1/4 inch in length are acceptable.

Wiping inspection: shall be performed by wiping the surface being inspected with a wet or dry lint free cloth. Cleanliness shall be evaluated by comparing the wiping cloth with one used to wipe a visually acceptable surface of similar area and finish which has been previously cleaned. If the wiping cloth exhibits more entrapped or captured foreign material or more discoloration than the comparison cloth, the hardware surface shall be cleaned and re-inspected. An inspection cloth that is free of discoloration and foreign material is acceptable.

Perform Liquid Penetrant Examination and magnetic particle testing for all welds.

After acceptance by the Government, the tanks shall be completely drained and dried.

3.3 RECORD DRAWINGS

Submit record drawings of completed installation no later than 30 days prior to final completion.

Acceptance of the completed drawings by the Contractor certifies accuracy and completeness of the documents.

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