2.3.2
Steel Piping Systems
Provide steel piping for the following piping systems.
[a.
Condenser water piping aboveground or within mechanical spaces.]
[b.
Ground heat exchanger piping within valve pits.]
[c.
Chilled/Hot Water Piping.]
2.3.2.1
Steel Pipe
Provide ASTM A 53 Type E or Type S, or ASTM A 106 steel pipe; except ASTM A
53, Type F steel pipe may be provided for water pipe sizes larger than 100
mm 4 inches. Provide Weight Class STD or Schedule No. 40 black steel pipe
for welding end connections. Provide Weight Class XS or Schedule No. 80
black steel pipe for threaded end connections.
2.3.2.2
Steel Pipe Fittings
Provide ASME B16.3 or ASME B16.11 threaded fittings, and ASME B16.39
threaded unions. Provide ASME B16.9 buttwelding fittings of the same
material and weight as the piping in which fittings are installed; provide
backing rings compatible with piping materials being butt welded. Provide
ASME B16.11 socket welding fittings.
2.3.2.3
Steel Pipe Unions
Provide ASME B16.39, Class 1034 150, unions with threaded end connections
on one side of threaded valve in steel piping systems.
2.3.2.4
Steel Pipe Flanges
Provide ASME B16.5, Class 1034 150 welding neck flanges. Extend bolts no
less than two full threads beyond the nut with the bolts tightened to the
required torque.
a.
Gaskets: Provide one piece factory cut gaskets suitable for the
intended service. Provide full-face gaskets for flat-face flanged
joints, and ring gaskets for raised-face flanged joints.
b.
Bolts:
Provide ASTM A 193/A 193M, Grade B7 bolts.
c.
Nuts:
ASTM A 194/A 194M, Grade 7.
d.
Washers:
Provide steel flat circular washers under bolt heads and
nuts.
2.3.3
Valves
**************************************************************************
NOTE: Boiler type service valves are not to be used.
**************************************************************************
Valves shall have flanged end connections, except valves smaller than 65 mm
2.5 inches may have threaded end connections with a union on one side of
the valve. Solder end connections may be used for connections between
copper alloy valves and copper tubing.
SECTION 15741N
Page 22
Previous Page
