A LOOK AT SERVICE SAFETY
Installation and Replacement Information
97
Figure 5-6.
Refrigerant line pressure drops for HFC-134a refrigerant (reprinted by permission of DuPont
Fluorochemicals).
0.2
0.3
0.4
0.5
0.6 0.8
1
2
3
4
6
8
10
20
30
40
0.1
0.2
0.4
0.6
1
2
4
6
10
20
30
40
60
100
0.1
0.2
0.3
0.4
0.6
0.8
1
2
3
6
8
10
20
30
40
60
80
100
At 80
°
F Condenser
At 100
°
F Condenser
At 120
°
F Condenser
6
1 /8
"
O
.D
. T
yp
e
L
C
op
pe
r T
ub
in
g
-6
0
°
F
E
va
p
o
ra
to
r T
e
m
p
e
ra
tu
re
-4
0
°
F
-2
0
°
F
2
0
°
F
4
0
°
F
D
is
ch
a
rg
e
L
in
e
s
L
iq
u
id
L
in
e
s
0
°
F
5
1 /8
"
4
1 /8
"
3
5 /8
"
3
1 /8
"
2
5 /8
"
2
1 /8
"
1
5 /8
"
1
3 /8
"
1
1 /8
"
7 /8
"
3 /4
"
5 /8
"
1 /2
"
3 /8
"
Pressure Drop In Psi Per 100 Ft.
Tons of Refrigeration
EXAMPLE:
25 Tons at -40
°
F Evap. and 100
°
F Cond.
2
5/8
" Suction Line
Pressure Drop = 5.5 p.s.i./100 ft.
1
1/8
" Liquid Line
Pressure Drop = 1.6 p.s.i./100 ft.
NOTE: Pressure drops do not
allow for pulsating flow.
If flow is pulsating, use
next larger pipe size.
Liquid line and discharge
lines determined at 0
°
F
evap. and 80
°
F cond.
Other conditions do not
appreciably change
result. Vapor at evap.
outlet assumed to be at 65
°
F.
