SECTION 15014 DETAIL PIPING SPECIFICATION – STAINLESS STEEL PIPE AND FITTINGS

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 15014

DETAIL PIPING SPECIFICATION – STAINLESS STEEL PIPE AND FITTINGS


PART 1 GENERAL

1.1 SECTION INCLUDES

A. Stainless steel pipe and fittings.

1.2 RELATED SECTION

A. Section 15000 - Plant Piping - General:
1. See referenced Section for additional requirements.

1.3 SUBMITTALS

A. As specified in Section 15000.

B. Welding procedures and qualifications.


PART 2 PRODUCTS

2.1 PIPE

A. Stainless steel, pickled and passivated, ASTM A 312 and ASTM A 778, Type 304L "as welded" grade, unless otherwise specified hereinafter.
1. 2-inch and smaller:  Schedule 40, seamless.
2. 2-1/2-inch thru 8-inch:  Schedule 10.
3. 10-inch thru 30-inch:  Schedule 5.
4. Dewatered Sludge Piping:
a. 2-inch and smaller:  Schedule 80, seamless.
b. 2-1/2-inch thru 12-inch:  Schedule 40.

2.2 JOINTS

A. 2-Inch and Smaller:  Screwed.

B. 2-1/2-inch and Larger:  Butt welded or flanged.

2.3 FITTINGS

A. 2-Inch and Smaller:  Screwed, stainless steel, 150-pound, rated 1,000-pound CWP forgings conforming to ASTM A 182, Type 304L, dimensions conforming to ANSI B16.3.

B. 2-1/2-Inch and Larger:  Butt welding type, stainless steel, pickled and passivated, schedule to match piping, ASTM A 774, Type 304L, conforming to MSS SP-43; "as welded" grade; all ells LR, unless otherwise designated.

C. Dewatered Sludge Piping:
1. 1-inch through 2-inch:
a. Forged 304 SS fittings, ASME B16.11, ASTM A182 Gr F304, Class 300 socket-weld.
b. Forged 304 SS fittings, ATSM A182 Gr F304, Class 300 socket-weld welding outlet.
2. 2-1/2- inch through 12-inch:
a. 304 SS or 304L SS fittings, ASTM A403 Class WP-W 304, WP-W 304L, WP-S 304, or WP-S 304L ASME B16.9, Sch 40S butt-weld or in the case of 90 & 45 degree 3R elbows manufactured out of ASTM A312 Gr TP 304 or 304L Schedule 40S pipe.
b. Shaped Nipple manufactured out of ASTM A312 Gr Tp304 or 304L Schedule 40S pipe as manufactured by Tube-Turn or equal.
3. All elbows must be 3R Elbows.

2.4 BRANCH CONNECTIONS

A. 2-Inch and Smaller:  Screwed tees as specified under FITTINGS, or 3,000-pound WOG forged stainless steel, ASTM A 182, Type 304L commercial welding branch fittings with threaded outlet, as manufactured by Bonney Forge Division, Gulf and Western Industrial Division, Allentown, PA; Allied Piping Products Co., Inc., Norristown, PA; or equal.

B. 2-1/2-Inch and Larger: Tees or reducing tees as specified under FITTINGS or fabricate from pipe.

2.5 FLANGES

A. Forged stainless steel, ASTM A 182, Type 304L, slip-on type, faced and drilled 150- pound, 1/16-inch raised face, ANSI B16.5 standard.

B. Dewatered Sludge Piping:
1. 1-inch through 2-inch: Forged 304 SS flanges, ASTM A182 Gr F304 ASME B16.5, Class 300 welding neck, raised face, with Sch. 80S bore or slip –on type.
2. 2-1/2- inch through 12-inch: Forged stainless steel flanges, ASTM A182 Gr F304, ASME B16.5, Class 300 welding neck, raised face, with Sch. 80S bore or slip –on type.

2.6 FACE RINGS

A. Stainless steel, ASTM A 240, Type 304L, ID drilled 1/16-inch larger than pipe OD. Thickness shall suit pipe wall thickness and welding procedure to avoid warpage.

2.7 BOLTING

A. Type 316 stainless, ASTM A 193, Grade B8M hex head bolts and ASTM A 194, Grade 8M hex head nuts.

B. Dewatered Sludge Piping:
1. Alloy continuous threaded stud, ASTM A193 Gr B8 Class 2 with heavy hex nuts, ASTM A194 Gr 8-S1 with threads conforming to ASME B1.1 coarse type, with Class 2A fit for bolts and studs, and Class 2B for nuts, for Class 300 joint.

2.8 GASKETS

A. Unless otherwise specified, 1/16-inch flat ring type asbestos composition, Cranite, Johns- Manville No. 60, or equal.

B. Gaskets for digester gas service shall be 1/8-inch thick neoprene rubber, durometer hardness No. 80, 1500 psi minimum tensile strength, 125 percent minimum elongation, flat ring type with RF flanges and full face type with FF flanges, Garlock Style 7797, or equal.

C. Dewatered Sludge Piping:
1. Stainless alloy spiral wound gasket, ASME B16.20, Class 300 0.175 inch thick 304 SS/flexible graphite

2.9 THREAD LUBRICANT

A. Teflon tape.

2.10 COVERED WELDING ELECTRODES FOR SHIELDED METAL ARCPROCESS

A. For Type 304L Pipe:  AWS 5.4, E 308L.

2.11 WELDING ROD AND BARE ELECTRODES FOR GAS TUNGSTEN ARC OR GAS METAL ARC PROCESSES

A. For Type 304L Pipe:  AWS 5.9, ER 308L.


PART 3 EXECUTION

3.1 WELDING

A. In accordance with latest editions of Section IX, ASME Boiler and Pressure Vessel Code and the American National Standard Code for Pressure Piping, ANSI B31.2 and B31.3 as applicable.

3.2 WELDING PROCEDURE QUALIFICATIONS

A. Furnish Engineer for prior review the procedure specifications and qualifications records of welding procedures for all pipe welding to be performed under this section, in accordance with Section IX, Article II of the ASME Boiler and Pressure Vessel Code.

3.3 WELDING PERFORMANCE QUALIFICATION

A. All welders and welding operators shall be qualified at the Contractor's sole expense by a qualified testing laboratory before performing any welding under this section. Qualification tests shall be in accordance with Section IX, Article III of the ASME Boiler and Pressure Vessel Code. Welders and operators shall be qualified for making groove welds in Types 304, 304L, 316, and 316L stainless steel pipe in position 6G for each welding process to be used.

B. Before the start of the work, Contractor shall submit a list of the welders he proposes using and the type of welding for which each has been qualified.

C. Qualification tests may be waived if evidence of prior qualification is deemed suitable by the Engineer. Contractor shall retest any welders at any time Engineer considers the quality of the welder's work substandard.

3.4 FABRICATION

A. End Preparation: Pipe edges shall be prepared preferably by machine shaping or cutting with an aluminum oxide blade. Oxygen or arc cutting are acceptable only if the cut is reasonably smooth and true and all slag is removed either by chipping or grinding. Beveled ends for butt-welding shall conform to ANSI B16.25.

B. Cleaning:  Surfaces shall be clean and free of paint, oil, rust, scale, slag, or other material detrimental to welding.  Before welding, wire brush joints to be welded with stainless steel wire brushes or stainless steel wool.

C. Alignment and Spacing: Align ends to be joined within existing commercial tolerances on diameters, wall thicknesses, and out-of-roundness. Root opening of the joint shall be as stated in the procedure specification.

D. Procedure:
1. The direct current, reverse polarity, shielded metal arc or gas metal arc processes or direct current, straight polarity, gas tungsten-arc process shall be used for all field welding.  Shop fabrication shall be in accordance with the submitted welding procedure qualifications.  No welding shall be performed if there is impingement of any rain, snow, sleet, or high wind on the weld area, or if the ambient temperature is below 32º F.  If the ambient is less than 32 º F, local preheating to a temperature warm to the hand is required.
2. Tack welds shall be thoroughly cleaned to avoid porosity or pinholing in the cover pass and shall be small enough to be readily fused into the succeeding bead. Tack welds, if not made by a qualified welder using the same procedure as for the completed weld, shall be completely removed. Tack welds which are not removed shall be made with an electrode that is the same as or equivalent to the electrode to be used for the first weld pass. Tack welds which have cracked shall be removed.
3. Each layer of deposited weld metal shall be thoroughly cleaned before the deposition of each additional layer of weld metal, including the final pass, with a power-driven stainless steel wire brush.  Surface defects that will affect the soundness of weld shall be chipped out or ground out.

4. Welds shall be free of cracks, incomplete penetration, weld undercutting, excessive weld reinforcement, porosity, slag inclusions, and other defects in excess of the limits prescribed in Chapter V of ANSI B31.3 as applicable.
5. Branch connections shall be fitted and groove-welded in accordance with the details described and shown in Chapter V of ANSI B31.3 as applicable.

3.5 TESTING

A. All lines shall be hydrostatically or pneumatically tested at the pressures listed in the Piping Schedule.  Procedures shall be as specified in Section 15000.

3.6 SUPPORTS AND HANGERS

A. All hanger-pipe contact surfaces shall have a dielectric barrier.  Hangers shall be as specified in Section 15000, except spacing shall be as follows:


Pipe Size
Maximum Support/Hanger Span
Minimum Rod Size Single Rod
Hanger
1-1/2-inch and Smaller 6 feet 3/8-inch
2-inch thru 6-inch 8 feet 1/2-inch
8-inch thru 12-inch 10 feet 5/8-inch
14-inch and 16-inch 12 feet 3/4-inch
18-inch and 20-inch 14 feet 7/8-inch
24-inch 14 feet 1-inch
30-inch 17 feet See Drawings

B. The load rating of universal concrete inserts shall not be less than that of the hanger rods they support.

3.7 CORROSION PROTECTION

A. As specified in Section 15000.


END OF SECTION