A LOOK AT SERVICE SAFETY
Installation and Replacement Information
101
Figure 5-10.
Refrigerant line velocities for HP62 (404A) refrigerant (reprinted by permission of DuPont
Fluorochemicals).
0.1
0.2
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
20
30
40
60
80
100
200
300
400
600
800
100
0.1
0.2
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
20
30
40
60
80
100
0.2
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
20
30
40
60
80
100
At 30
°
C Condenser
At 40
°
C Condenser
At 50
°
C Condenser
6
1
/8
"
O
.D
. T
ype L C
opper
Tubing
5
1
/8
"
4
1
/8
"
3
5
/8
"
3
1
/8
"
2
5
/8
"
7 /8
"
3 /4
"
5 /8
"
3 /8
"
1 /2
"
2
1
/8
"
1
5
/8
"
1
1
/8
"
1
3
/8
"
-5
0
°
C
E
va
p
o
ra
to
r
Te
m
p
e
ra
tu
re
s
-4
0
°
C
-3
0
°
C
-2
0
°
C
0
°
C
-1
0
°
C
1
0
°
C
D
is
ch
a
rg
e
L
in
e
s
L
iq
u
id
L
in
e
s
Velocity In M/S
Kilowatts of Refrigeration
EXAMPLE:
55 kW at -40
°
C Evap., 40
°
C Cond.
2
1/8
" Suction Line Velocity = 38 m/s
1
3/8
" Liquid Line Velocity = 0.55 m/s
NOTE: Liquid line and discharge lines determined at -20
°
C evap.
and 30
°
C cond. Other conditions do not appreciably change
result. Net refrigeration for HP-62 includes suction gas at 20
°
C.