Chapter hvac engineering Fundamentals: Part 1 Introduction



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HVAC HANDBOOK


part
of
this
standard.
Design Procedures: Part 4
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright © 2004 The McGraw-Hill Companies. All rights reserved.
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160
Chapter Six
TABLE
6.6 Copper Tubing Dimensions (in inches)
1
4
1
2
1
2
1
2
3
8
1
2
3
4
Note: Tubing is available up to 8 in.
are shown in Table 6.6. Type L is most commonly used and is suitable
for pressures of up to about 250 to 300 lb / in
2
gauge.
Other materials include fiberglass-reinforced plastic (FRP), ultra-
high molecular weight polyethylene (UHPE), polypropylene (PP) poly-
butylene, (PB), polyvinyl chloride (PVC), and chlorinated polyvinyl
chloride (CPVC). These have excellent corrosion resistance and low
flow resistance, but have lower pressure and temperature ratings than
steel or copper. Complete data on these materials are available from
the manufacturers. PVC is often used for equipment drain lines.
Galvanized-steel piping is used occasionally. The dimensions are the
same as for black-steel pipe.
Occasionally cast iron, but more often ductile iron, has some HVAC
applications. Ductile iron can be grooved to accept gasketed iron cou-
plings.
Cast-iron piping is seldom used in sizes less than 4 in, although
cast-iron fittings are available down to 1-in size. Wrought-iron piping
has been used extensively in the past for steam condensate, but it is
seldom used anymore because of the extra cost.
Some regions of the country have a well-developed stainless steel
market. On a local basis, stainless steel piping may be found to be
cost competitive with other piping materials.

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