LOW PRESSURE COMPRESSED AIR PIPING AND ACCESSORIES

2.7

Low pressure compressed air piping and accessories 862 kPa (gage) at 65 1/2

degrees C 125 psig at 150 degrees F, shall conform to the following:

2.7.1

Steel Piping

a.

Pipe: ASTM A 53/A 53M, seamless [or electric resistance welded]

carbon steel, Schedule 40, black.

b.

Fittings, size 50 mm 2 inches and larger: ASME B16.9, carbon

steel, butt welding, schedule 40, or ASME B46.1, carbon steel

welding neck flanges, Class 150, ASME B46.1, flanged fittings,

carbon steel, Class 150, gaskets 1.50 mm 1/16 inch oil resistant

synthetic rubber ASTM D 1330, 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.

c.

Fittings, size 40 mm 1 1/2 inches and smaller: ASME B16.3,

threaded malleable iron, Class 150, or ASME B16.11, forged carbon

steel Class 3000 socket welding or Class 2000 threaded. Joints

may also be butt welded or flanged, as specified for sizes 50 mm 2

inches and larger.

d.

Flat-faced steel flanges: Where connections are made to Class 125

cast iron flanges with steel flanges, use only flat-faced Class

150 steel flanges.

e.

Unions:

ASME B16.39, Class 1 (2068 kPa (gage)300 psig WOG).

2.7.2

Copper Tubing

a.

Tubing:

ASTM B 88M ASTM B 88, Type K or L, hard drawn, Class 1.

b.

Fittings: ASME B16.22 wrought copper or bronze, with silver

brazed joints.

c.

Brazing filler metal:

FS QQ-B-654, Class III.

d.

Unions:

bronze, FS WW-U-516, brazed joint type.

e.

Flanges and flanged fittings: ANSI B16.24, bronze, Class 150,

gaskets, oil resistant synthetic rubber, ASTM D 1330, bolts ASTM A

193/A 193M, Grade B7, and nuts ASTM A 194/A 194M, Grade 7.

f.

Flared fittings: ASTM B 88M ASTM B 88, Type K or L, annealed,

with ASME B16.26 or SAE J513 flared fittings.

2.7.3

Valves

2.7.3.1

Gate Valves

a.

Bronze Gate Valves: MSS SP-80, Class 150, 50 mm 2 inches and

smaller, wedge disc, rising stem, inside screw type, with brazed

joints ends when used with copper tubing.

b.

Steel Gate Valves: MSS SP-84, 50 mm 2 inches and smaller, ASME

B16.34, over 50 mm 2 inches, flanged ends, outside screw and yoke

type with solid wedge or flexible wedge disc, [Class 150] [as

SECTION 15211N

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