maximum temperature of 66 degrees C 150 degrees F.
Class 300 steam rated components have water-oil-gas
(WOG) ratings above 2758 kPa (gage) at 66 degrees C
400 psig at 150 degrees F. If higher operating
temperatures are expected, change component
descriptions to higher ratings as required after
reviewing appropriate component specification.
**************************************************************************
Medium pressure compressed air piping and accessories 869 to 2751 kPa
(gage) at 66 degrees C 126 to 399 psig at 150 degrees F shall conform to
the following:
2.10.1
Pipe
ASTM A 53/A 53M or ASTM A 106, seamless carbon steel, Schedule 40, black.
2.10.2
Fittings, Size 50 Millimeters 2 Inches and Larger
ASME B16.9, carbon steel, butt welding, Schedule 40, or ASME B46.1, carbon
steel welding neck flanges, Class 300, ASME B46.1, flanged fittings, carbon
steel, Class 300, gaskets ASME B16.20, spiral wound metallic, Class 300,
bolts ASTM A 193/A 193M, Grade B7, and nuts, ASTM A 194/A 194M, Grade 7.
Butt welded joints shall be full penetration consumable insert or backing
ring type.
2.10.3
Fittings, Size 40 Millimeters 1 1/2 Inches and Smaller
ASME B16.11, forged carbon steel, Class 3000 socket welding or Class 2000
threaded. Seal weld threaded joints not required to disassemble piping for
maintenance. Joints may also be butt welded or flanged, as specified for
sizes 50 mm 2 inches and larger.
2.10.4
Flat-faced Steel Flanges
Where connections are made to Class 250 cast iron flanges with steel
flanges, use only flat-faced Class 300 steel flanges.
2.10.5
Unions
ASME B16.39, Class 2 (3447 kPa (gage)500 psig WOG, cold, non-shock).
2.10.6
Valves
2.10.6.1
Globe and Angle Valves
Sizes 50 mm 2 inches and smaller, bronze, MSS SP-80, Type 3 (Metallic Disc,
Renewable Seat), Class 300, threaded ends, or carbon steel, MSS SP-84,
Class 300, threaded ends. Sizes larger than 50 mm 2 inches, ASME B16.34,
carbon steel, tapered disk, Class 300, flanged ends.
2.10.6.2
Check Valves
ASME B16.34 or MSS SP-71, Class 300, steel, lift or swing type.
2.10.6.3
Pressure Reducing Valves
NFLPA T3.12.3 R2, with nominal pressure rating of not less than inlet
system pressure indicated. Provide pressure reducing valves capable of
SECTION 15212N
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