MIL-HDBK-1003/3
Table 8 (Continued)
Piping Materials
SERVICE
PIPE
FITTINGS
Drain or
Galvanized steel
Galvanized, drainage,
Condensate
pipe(2)
cast, or malleable
Lines
iron(3)
Hard copper
Cast brass, wrought
tubing (2)
copper, or wrought brass
Steam or
Black steel pipe(2),(4)
Welded or cast iron(3)
Condensate
Hard copper tubing(2),
Cast brass, wrought
(4)
copper, or wrought brass
Hot Water
Cast steel pipe
Welded or cast iron(3)
Hard copper tubing(2)
Cast brass, wrought
copper, or wrought brass
(1)
Soft copper Type L can be used for sizes 7/8 in. OD and
smaller, except for sizes 1/4 in. and 3/8 in. OD (Type K
must be used for 1/4 in. and 3/8 in. OD sizes).
(2)
Normally standard wall steel pipe or Type L hard copper
tubing is satisfactory for air conditioning applications,
however, the piping material selected shall be checked
for design temperature-pressure ratings.
(3)
Normally 125 lb cast iron and 150 lb malleable iron
fittings are satisfactory for air conditioning
applications, however, the fitting material selected
shall be checked for temperature-pressure ratings.
(4)
For steam condensate return lines use Schedule 80 black
steel or Schedule 80 wrought iron pipe. Where hard
copper tubing is used, check for compatibility with
condensate.
7.1.10
Flexible Hose. Flexible connections can be installed
between moving components and piping. Consider the dual use of
flexible hoses as a union point. Pipe shall be anchored at the
end, away from moving components.
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