Data Sheet

Bulletin 71.4:MR98
36
NOMINAL
BODY
SIZE,
In. / DN
SPRING RELIEF
PRESSURE
RANGE
RELIEF
PRESSURE
SETTING
PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar
30 / 2.1 35 / 2.4 40 / 2.8 50 / 3.4  
psi bar psig bar SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h
1/4 NPT
150 to
375
10.3 to
25.9
150 10.3 3730 100 4210 113 4680 125 5630 151 7190 193 8760 235
175 12.1 4110 110 4630 124 5140 138 6170 165 7840 210 9510 255
200 13.8 4410 118 4950 133 5480 147 6550 176 8410 225 10,300 275
250 17.2 4960 133 5540 149 6120 164 7290 195 9400 252 11,500 309
300 20.7 5420 145 6050 162 6680 179 7940 213 10,400 280 12,900 347
375 25.9
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 8710 234 9980 268 11,300 302 13,800 370 19,800 532 25,900 694
175 12.1 9400 252 10,800 290 12,200 327 15,000 402 21,900 587 28,800 773
200 13.8 10,300 276 11,700 314 13,100 352 15,900 427 22,800 612 29,700 797
250 17.2 11,200 301 12,800 344 14,400 386 17,600 471 25,100 673 32,700 876
300 20.7 12,300 331 14,000 375 15,600 419 18,900 507 26,600 714 34,300 921
375 25.9
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 16,200 434 18,400 494 20,700 554 25,100 673 35,700 957 46,300 1240
175 12.1 18,100 486 20,300 544 22,500 603 26,800 720 37,500 1000 48,100 1290
200 13.8 19,100 513 21,700 582 24,300 650 29,400 788 40,500 1090 51,700 1390
250 17.2 22,100 592 24,500 658 27,000 724 32,000 857 45,500 1220 59,100 1580
300 20.7 24,200 648 27,100 727 30,000 805 35,900 963 50,000 1340 64,000 1720
375 25.9
- Shaded areas show where maximum inlet pressures are exceeded.
Table 21. Air Relief Capacities in SCFH / Nm
3
/h, Types MR98HH and MR98HHD with Metal Diaphragm
- continued -
NOMINAL
BODY
SIZE,
In. / DN
SPRING RELIEF
PRESSURE RANGE
RELIEF PRESSURE
SETTING
PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar
5 / 0.34  15 / 1.0 20 / 1.4 
psi bar psig bar SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h
1/4 NPT
150 to
375
10.3 to
25.9
150 10.3 1240 33.2 1750 46.9 2250 60.2 2740 73.6 3240 86.8
175 12.1 1420 38.1 1940 52 2510 67.2 3070 82.3 3590 96.3
200 13.8 1560 41.7 2140 57.3 2690 72.1 3240 87 3830 103
250 17.2 1870 50 2510 67.2 3110 83.3 3710 99.4 4330 116
300 20.7 2150 57.7 2790 74.8 3440 92.2 4090 110 4750 127
375 25.9 2610 70.1 3340 89.7 4060 109 4780 128 5540 148
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 2770 74.3 3830 103 4900 131 5970 160 7340 197
175 12.1 3440 92.2 4580 123 5760 154 6930 186 8170 219
200 13.8 3720 99.8 4760 128 6110 164 7450 200 8880 238
250 17.2 4380 117 5660 152 7010 188 8360 224 9800 263
300 20.7 5040 135 6290 169 7950 213 9610 258 11,000 294
375 25.9 6220 167 7810 209 9520 255 11,200 301 12,800 342
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 5690 153 7630 205 9740 261 11,800 318 14,000 376
175 12.1 6560 176 8500 228 10,800 290 13,100 352 15,600 419
200 13.8 7340 197 9560 256 11,900 320 14,300 383 16,700 448
250 17.2 8590 230 11,300 304 14,000 376 16,700 448 19,400 520
300 20.7 10,100 271 12,800 342 15,700 421 18,600 500 21,400 574
375 25.9 12,000 323 15,300 410 18,500 497 21,700 583 25,300 677
Table 21. Air Relief Capacities in SCFH / Nm
3
/h, Types MR98HH and MR98HHD with Metal Diaphragm (continued)