Data Sheet

Bulletin 71.4:MR98
29
NOMINAL
BODY
SIZE,
In. / DN
SPRING RELIEF
PRESSURE RANGE
COLOR
CODE
RELIEF PRESSURE
SETTING
PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar
30 / 2.1 50 / 3.4  
psi bar psig bar SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h
1/4 NPT
15 to 35 1.0 to 2.4 Yellow
15 1.0 3000 81 4000 108 5300 142 6600 176
25 1.7 3600 95.6 4600 123 5800 156 7000 189
35 2.4 4000 108 5100 136 6300 169 7500 202
25 to 75 1.7 to 5.2 Green
35 2.4 4000 106 5000 135 6300 168 7500 201
50 3.4 4700 126 5900 157 7100 190 8300 223
75 5.2 5900 158 7200 194 8400 225 9600 256
70 to 140 4.8 to 9.7 Red
75 5.2 5300 142 7000 187 8300 222 9600 257
100 6.9 6300 168 8200 221 9500 256 11,000 291
125 8.6 7000 187 9300 250 11,000 287 12,000 324
130 to 200 9.0 to 13.8 Blue
150 10.3 7700 207 10,000 271 11,000 307 13,000 343
175 12.1 7000 188 11,000 282 12,000 319 13,000 357
200 13.8 7500 201 11,000 296 12,000 331 14,000 366
1/2 / 15
15 to 35 1.0 to 2.4 Yellow
15 1.0 7400 200 9800 264 13,000 346 16,000 429
25 1.7 8700 232 11,000 298 14,000 381 17,000 464
35 2.4 10,000 268 12,000 333 16,000 417 19,000 501
25 to 75 1.7 to 5.2 Green
35 2.4 9600 257 12,000 327 15,000 411 18,000 495
50 3.4 11,000 307 14,000 383 17,000 466 20,000 548
75 5.2 15,000 391 18,000 479 21,000 556 24,000 634
70 to 140 4.8 to 9.7 Red
75 5.2 14,000 372 18,000 472 20,000 544 23,000 616
100 6.9 17,000 448 21,000 556 24,000 638 27,000 720
125 8.6 19,000 507 24,000 630 27,000 717 30,000 804
130 to 200 9.0 to 13.8 Blue
150 10.3 15,000 402 23,000 630 28,000 751 33,000 873
175 12.1 17,000 443 26,000 699 31,000 825 36,000 952
200 13.8 19,000 512 29,000 785 34,000 915 39,000 1040
3/4 and 1 /
20 and 25
15 to 35 1.0 to 2.4 Yellow
15 1.0 14,000 381 19,000 505 25,000 671 31,000 838
25 1.7 17,000 445 21,000 576 28,000 739 34,000 901
35 2.4 19,000 517 24,000 648 30,000 809 36,000 969
25 to 75 1.7 to 5.2 Green
35 2.4 19,000 508 24,000 643 30,000 803 36,000 963
50 3.4 22,000 600 28,000 746 34,000 905 40,000 1060
75 5.2 28,000 745 34,000 915 40,000 1070 46,000 1220
70 to 140 4.8 to 9.7 Red
75 5.2 27,000 718 34,000 916 40,000 1080 46,000 1240
100 6.9 32,000 850 40,000 1070 46,000 1230 52,000 1390
125 8.6 37,000 995 46,000 1240
52,000 1400 58,000 1570
130 to 200 9.0 to 13.8 Blue
150 10.3 33,000 876 49,000 1300 57,000 1530 66,000 1760
175 12.1 38,000 1010 54,000 1450 63,000 1690 72,000 1920
200 13.8 39,000 1060 59,000 1580 65,000 1750 71,000 1910
1-1/2 and 2 /
40 and 50
5 to 35 0.34 to 2.4 Dark gray
5 0.34 35,000 951 52,000 1390 72,000 1940 93,000 2490
10 0.69 39,000 1050 54,000 1450 75,000 2020 96,000 2580
15 1.0 43,000 1160 60,000 1600 80,000 2130 99,000 2660
25 1.7 50,000 1330 66,000 1770 86,000 2310 106,000 2840
35 2.4 57,000 1530 74,000 1990 91,000 2440 108,000 2900
20 to 65 1.4 to 4.5
Black with
light blue
stripe
25 1.7 47,000 1250 63,000 1700 83,000 2230 103,000 2760
35 2.4 53,000 1410 71,000 1910 90,000 2420 110,000 2940
50 3.4 64,000 1710 82,000 2200 101,000 2710 120,000 3220
65 4.5 72,000 1930 92,000 2470 112,000 3010 132,000 3540
50 to 100 3.4 to 6.9 Light gray
50 3.4 61,000 1620 82,000 2190 102,000 2740 122,000 3280
75 5.2 75,000 2020 98,000 2630 120,000 3220 142,000 3810
100 6.9 91,000 2450 116,000 3100 138,000 3710 161,000 4320
75 to 170 5.2 to 11.7 Black
75 5.2 61,000 1640 89,400 2400 111,000 2980 133,000 3560
100 6.9 76,000 2030 107,000 2880 130,000 3480 152,000 4080
125 8.6 88,000 2360 121,000 3250 145,000 3900 170,000 4550
170 11.7 111,000 2970 151,000 4060 178,000 4790 206,000 5510
Table 15. Air Relief Capacities in SCFH / Nm
3
/h, Types MR98H and MR98HD with Elastomer Diaphragm (continued)