Data Sheet

Bulletin 71.4:MR98
34
- 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 lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h
1/4 NPT
150 to
375
10.3 to
25.9
150 10.3 53.2 24.2 75.2 34.2 96.7 43.9 118 53.7 139 63.4
175 12.1 61.1 27.8 83.5 37.9 108 49 132 60.1 155 70.3
200 13.8 67 30.4 92 41.8 116 52.6 140 63.4 165 74.9
250 17.2 80.3 36.5 108 49 134 60.8 159 72.5 186 84.7
300 20.7 92.6 42.1 120 54.6 148 67.3 176 80 205 93
375 25.9 113 51.1 144 65.4 175 79.4 206 93.5 238 108
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 119 54.2 165 74.8 211 95.8 257 117 316 144
175 12.1 148 67.3 197 89.7 248 113 298 135 351 160
200 13.8 160 72.8 205 93.2 263 119 321 146 382 174
250 17.2 189 85.7 243 111 301 137 360 163 422 192
300 20.7 217 98.5 271 123 342 155 413 188 472 215
375 25.9 268 122 336 153 410 186 483 220 550 250
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 245 111 329 149 419 191 510 232 604 274
175 12.1 283 128 366 166 466 212 565 257 673 306
200 13.8 316 144 411 187 513 233 615 279 719 327
250 17.2 369 168 487 222 603 274 720 327 835 379
300 20.7 435 198 549 249 675 307 802 364 921 419
375 25.9 518 235 658 299 797 362 935 425 1090 494
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 lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h
1/4 NPT
150 to
375
10.3 to
25.9
150 10.3 161 73 181 82.3 201 91.5 242 110 310 141 377 171
175 12.1 177 80.5 199 90.5 221 101 265 121 337 153 409 186
200 13.8 190 86.4 213 96.8 236 107 282 128 362 164 442 201
250 17.2 213 97 238 108 263 120 314 143 405 184 496 225
300 20.7 233 106 260 118 287 131 342 155 449 204 557 253
375 25.9
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 375 170 430 195 484 220 594 270 854 388 1110 506
175 12.1 405 184 465 211 525 239 645 293 943 428 1240 564
200 13.8 444 202 504 229 565 257 686 312 982 446 1280 581
250 17.2 484 220 552 251 620 282 756 343 1080 491 1410 639
300 20.7 531 241 602 274 673 306 814 370 1150 521 1480 672
375 25.9
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 698 317 793 361 889 404 1080 491 1540 698 1990 905
175 12.1 780 355 874 397 967 440 1150 525 1610 733 2070 940
200 13.8 824 374 934 424 1040 474 1260 575 1740 793 2230 1010
250 17.2 950 432 1060 480 1160 529 1380 625 1960 891 2540 1160
300 20.7 1040 473 1170 530 1290 588 1550 703 2150 977 2750 1250
375 25.9
- Shaded areas show where maximum inlet pressures are exceeded.
Table 19. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98HH and MR98HHD with Metal Diaphragm Only
Table 19. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98HH and MR98HHD with Metal Diaphragm Only (continued)