Chapter hvac engineering Fundamentals: Part 1 Introduction

166
Figur
e
6.9
F
riction
loss
for
w
ater
in
commercial
steel
pipe
(schedule
40).
(
SO
UR
CE
:
Copyright
2001,
American
Society
of
Heating,
Refrigerating
and
Air
Conditioning
Engineers,
Inc.,
www
.ashrae.org.
Reprinted
by
permission
from
ASHRAE
Handbook,
2001
Fundamentals,
Chap.
35,
F
ig.
1.)
Design Procedures: Part 4
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Design Procedures: Part 4
167
Figure 6.10
Friction loss for water in copper tubing (types K, L, M). (
SOURCE
: Copyright
2001, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc.,
www.ashrae.org. Reprinted by permission from ASHRAE Handbook,
2001 Fundamen-
tals,
Chap. 35, Fig. 2.)
Piping insulation is usually ‘‘preformed’’ to snap readily in place
around the pipe. A protective jacket is required, usually canvas on hot
lines and a vapor barrier type on cold lines. The vapor barrier speci-
fication must include a mastic seal at all joints and edges and should
prohibit the use of staples. In areas where the pipe is exposed to dam-
age, a metal or plastic jacket may be specified, including preformed
jacket sections for fittings and valves. Insulation should be verified as
acceptable for the application. Materials such as fiberglass, calcium
silicate, foamed glass, and foamed plastic are all available.