buttwelded pipe may be used in sizes 40 mm (1-1/2 inches) 1-1/2 inches and
smaller.
2.1.2
Small Fittings
Fittings 40 mm (1-1/2 inches) 1-1/2 inches and smaller shall conform to
ASME B16.11.
2.1.3
Fittings, 50 mm (2 Inches) 2 Inches and Larger
Pipe flanges and flanged fittings including bolts, nuts, and bolt patterns
shall be in accordance with ASME B16.5, Class [_____]. Buttweld fittings
shall be in accordance with ASME B16.9. Weld neck flanges shall be used.
2.1.4
Steel Forged Branch Connections
Connections shall conform to ASTM A 181/A 181M, Class 60, carbon steel.
2.1.5
Flange Gaskets
Gaskets shall be non-asbestos compressed material in accordance with ASME
B16.21, 1.6 mm (1/16 inch) 1/16 inch minimum thickness, full face or
self-centering flat ring type. The gaskets shall contain aramid fibers
bonded with nitrile butadiene rubber (NBR), or glass fibers bonded with
polytetrafluoroethylene, suitable for maximum 315 degrees C 600 degrees F
service and meeting applicable requirements of ASME B31.8.
2.1.6
Pipe Threads
Pipe threads shall conform to ASME B1.20.1.
2.1.7
Polyethylene Pipe, Tubing, Fittings and Joints
**************************************************************************
NOTE: Before selecting polyethylene or fiberglass
pipe material, the gas supplier should be contacted
for a gas analysis to determine the types of
chemicals which will be in the gas he will supply.
Suitable polyethylene or fiberglass pipe material
will be selected based on the gas analysis.
Polyethylene shall not
be used for gas lines with
design pressures above
690 kPa (100 psig) or with
operating temperatures
below 7 degrees C (20 degrees
F) or above 60 degrees
C (140 degrees F).
For thermoplastic (polyethylene) pipe in sizes from
15 mm through 150 mm (1/2 inch through 6 inches),
select minimum wall thickness based on ASME B31.8,
table 842.32(c); and select the standard dimension
ratio (SDR) based on the long-term hydrostatic
strength of S = 8.6 MPa (1,250 psi) for PE 2406 or S
= 11 MPa (1,600 psi) for PE 3408 at 23 degrees C (73
degrees F) for the following pressures:
SECTION 02556A
Page 11
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