2.7
FITTINGS FOR STAINLESS STEEL PIPING
2.7.1
Threaded Fittings and Socket Welding Fittings
ASME B16.11, except stainless steel shall conform to ASTM A 182/A 182M,
Grade F304L.
2.7.2
Buttwelding Fittings and Tapered Reducing Fittings
ASME B16.9, except stainless steel shall conform to ASTM A 403/A 403M,
Class WP, Type 304L, of the same weight as the pipe in which the fittings
are installed.
2.7.3
Flanges
ASME B16.5, Class 150, Raised Face Type, except stainless steel shall
conform to ASTM A 182/A 182M, Grade F304L.
2.7.4
Unions
ASME B16.39, Class 150, except stainless steel shall conform to ASTM A
312/A 312M, Type 304L.
2.8
WELDING FOR STAINLESS STEEL PIPING
2.8.1
Process for Stainless Steel
ASME B31.3, Gas Tungston Arc Process or Gas Metal Arc Process. [Ten
percent of welds shall be examined by radiography; if 25 percent of the
radiographed welds fail, 100 percent of welds shall be examined by
2.8.2
Welding Electrodes
AWS A5.4, E308L electrodes.
2.9
ALUMINUM PIPING
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NOTE: Indicate on drawings the piping materials
permitted for each piping system (i.e., carbon steel
piping, stainless steel piping, aluminum piping).
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ASTM B 241/B 241M or ASTM B 345/B 345M, alloy 6061-T6, Schedule 40 for pipe
sizes 50 mm 2 inches through 300 mm 12 inches; Schedule 80 for pipe sizes
50 mm 2 inches and smaller.
2.10
FITTINGS FOR ALUMINUM PIPING
Aluminum to aluminum threaded connections shall not be permitted.
Stainless steel and brass male threads to aluminum are acceptable.
2.10.1
Socket Welding Fittings
ASME B16.11, except aluminum shall be alloy 5083-H112, alloy 6061-T6, or
alloy 356-T6.
SECTION 15194N
Page 16
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