24
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 1/219 1/461 108 445
12 2 1/212 1/444 75 308
14 2 9 1/232 56 228
18 5 1/419 1/433 137
20 4 1/416 28 110 371
25 2 1/29 1/218 72 238
30 2 7 12 49 165
35 2 5 1/49 37 121
40 3 1/27 28 93 366
50 2 1/24 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.