Table 17. henry relief valve capacity ratings, Table 18. discharge piping table – Heatcraft Refrigeration Products H-IM-72A User Manual
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Table 17. Henry Relief Valve Capacity Ratings
Pounds of Air per Minute for all Refrigerants Except Ammonia R717
TYPE
CATALOG SIZE CONNECTION STANDARD PRESSURE SETTINGS PSIG
NUMBER
INLET
OUTLET
350
400
425
450
ANGLE
526E
3/8 M.P.T.
3/8 FLARE
10.2
11.6
12.3
13.0
527E
1/2 M.P.T.
5/8 FLARE
28.5
32.4
34.4
36.3
5231
3/8 M.P.T.
3/8 FLARE
11.2
12.7
13.5
14.3
5231-A
3/8 M.P.T.
1/2 FLARE
18.6
21.1
22.4
23.7
STRAIGHT
5231
1/2 M.P.T.
5/8 FLARE
18.6
21.1
22.4
23.7
THROUGH
5232
1/2 M.P.T.
5/8 FLARE
28.1
32.0
33.9
35.8
5240-1/2
1/2 M.P.T.
3/4 F.P.T.
41.2
46.8
49.1
52.5
5242-3/4
3/4 M.P.T.
3/4 F.P.T.
41.2
46.8
49.1
52.5
5244-1
1 M.P.T.
1 F.P.T.
74.0
84.2
89.3
94.4
5246-1-1/4
1-1/4 M.P.T.
1-1/4 F.P.T.
129.7
147.5
156.4
165.4
Table 18. Discharge Piping Table
MAXIMUM LENGTH OF DISCHARGE PIPE IN FEET
* FOR 400 PSIG PRESSURE SETTING
RELIEF DEVICE
CAPACITY
SOFT COPPER TUBE O.D.
SCHEDULE 40 PIPE
LBS. AIR/MIN.
3/8”
1/2”
5/8”
1/2”
3/4”
1”
1
1
/
4
”
1
1
/
2
”
2”
10
3
1
/
2
19
1
/
4
61
108
445
12
2
1
/
2
12
1
/
4
44
75
308
14
2
9
1
/
2
32
56
228
18
5
1
/
4
19
1
/
4
33
137
20
4
1
/
4
16
28
110
371
25
2
1
/
2
9
1
/
2
18
72
238
30
2
7
12
49
165
35
2
5
1
/
4
9
37
121
40
3
1
/
2
7
28
93
366
50
2
1
/
2
4
18
60
233
70
3
9
30
119
257
80
2
7
23
91
198
90
2
5
18
72
156
125
3
10
37
81
282
150
2
7
26
56
196
For Relief Devices set at 400 psig
• Obtain the capacity at 400 psig setting.
• Locate this capacity or the nearest larger capacity in the left-hand column of the discharge piping table above and read across to obtain the
maximum lengths for each tube and pipe size.
For relief devices set at 350 psig, use the above table and multiply by .75 to determine maximum lengths.
For relief devices set at 425 psig, use the above table and multiply by 1.15 to determine maximum lengths.
For relief devices set at 450 psig, use the above table and multiply by 1.25 to determine maximum lengths.