A LOOK AT SERVICE SAFETY
Installation and Replacement Information
93
III.
Refrigerant Line Pressure Drops
Figure 5-2.
Refrigerant line pressure drops for “Freon” 12 refrigerant (reprinted by permission of DuPont
Fluorochemicals).
.2
.3
.4
.6
.8
2
3
4
6
8
10
20
30
40
60
80
100
2000
3000
4000
6000
8000
10,000
BTU's Per HR
0.2
0.2
0.3
0.4
0.6
0.8
1
2
3
4
5
6
8
10
20
30
40
50
0.3
0.4
0.6
0.8
1
2
3
4
5
6
8
10
20
30
40
50
EXAMPLE:
5.5 Tons at -40
°
C Evap. 85
°
F Cond.
3
1/8
" Suction Line Pressure Drop = 0.155 p.s.i./100 ft.
3/4
" Liquid Line Pressure Drop = 1.0 p.s.i./100 ft.
At 120
°
F Condenser
At 100
°
F Condenser
At 80
°
F Condenser
6
1 /8
"
5
1 /8
"
4
1 /8
"
3
5 /8
"
3
1 /8
"
2
1 /8
"
1
5 /8
"
1
1 /8
"
7 /8
"
3 /4
"
5 /8
"
1 /2
"
3 /8
"
-6
0
°
F
E
va
p
o
ra
to
r
Te
m
p
e
ra
tu
re
-4
0
°
F
4
0
°
F
D
isch
a
rg
e L
in
e
s 80
°
F
C
o
n
d
e
n
se
r
1
00
°
F
C
o
n
d
e
n
se
r
12
0
°
F
C
o
n
d
e
nser
L
iqu
id
Lin
e
-2
0
°
F
20
°
F
0
°
F
1
3 /8
" O
.D
. T
yp
e L C
opper
Tubing
2
5 /8
"
Tons of Refrigeration
Pressure Drop In Lbs. Per Sq. In. Per 100 Ft.
NOTE: Pressure drops do not
allow for pulsating flow. If
flow is pulsating, use next
larger pipe size. Liquid
line determined at 0
°
F
evap. & 80
°
F cond.
Discharge lines at 0
°
F
evap. Other conditions do
not appreciably change
result. Vapor evap. outlet
assumed to be at 65
°
F.
