distribution pressures considerably higher than
steam buffer type method). Select design pressure
equal or greater than one and one half (1-1/2) times
the maximum operating pressure.
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ASME B31.1; Maximum operating pressure of [_____] kPa psi at [_____]
degrees C degrees F; design pressure of [2068] [2758] [4136] [_____] kPa
[300] [400] [600] [_____] psi.
2.1.2
Pipe
Pipe 50 mm 2 inches in diameter and larger: schedule 80, black steel plain
end beveled, ASTM A 53, Grade B, Type E (electric resistance welded) or S
(seamless), or ASTM A 106, Grade B. Pipe sizes through 40 mm 1 1/2 inches
in diameter: schedule 80, black steel, ASTM A 106, Grade B.
2.1.3
Pipe Fittings
Fittings shall be compatible in thickness with the pipe being used, shall
be used in conformance with ASME B31.1, and shall conform to the following
requirements. Steel welded fittings: ASTM A 234/A 234M. Flanges shall be
serrated or raised-faced type. In horizontal lines, reducing fittings
shall be the eccentric type and installed to ensure that the system can be
thoroughly drained. Remove raised faces when used with existing flanges
having a flat face.
2.1.3.1
Fittings for Steel Pipe Sizes 3 to 50 mm 1/8 to 2 Inches
ASME B16.11, Class 300 steel socket welding type.
2.1.3.2
Fittings for Steel Sizes 65 mm 2 1/2 Inches and Above
Steel fitting butt welding type ASME B16.9 or ASME B16.5flanged type, Class
300.
2.1.4
Gaskets
The Contractor shall submit the manufacturers published temperature and
pressure ratings and provide materials recommended by the manufacturer for
the maximum operating temperature, system design pressure, and service
specified herein.
2.1.5
Bolting
Bolt studs for flanged joints shall be alloy steel studs, threaded on both
ends and fitted with two hexagon nuts per stud. Bolt shall be
ANSI B18.2.1 and material shall conform to ASTM A 193/A 193M, Grade B-7,
threads Class 7 fit. Nuts shall be American Standard Heavy semi-finished
hexagonal (ASME B18.2.2) and material shall conform to ASTM A 194/A 194M,
Grade 7.
2.1.6
Vents
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NOTE: Air chambers may be deleted if branch
connections are made to bottom half of existing
overhead supply and return mains. See paragraph
entitled "Branch Connections" herein.
SECTION 15184N
Page 10
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