Buying Guide
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RATED INTERNAL WORKING PRESSURES OF
CAST COPPER ALLOY FLANGES AND FLANGED FITTINGS
Pressure (PSI)
Nominal Size Joint Temperature
(In Inches) °F (°C)
A
Class 125
A, B
Class 150
B
Class 150
A, C
1/2, 3/4,
1, 1 1/4, 0 – 150 (0 – 66) 105 (7) 210 (14) 225 (15)
1 1/2, 2, 2 1/2, 175 1(79) 100 (7) 205 (14) 220 (15)
3, 4, 5, 6, 8 200 1(93) 195 (7) 195 (13) 210 (15)
(also 10" for 225 (107) 190 (6) 190 (13) 205 (14)
Class 125) 250 (121) 190 (6) 180 (12) 195 (13)
275 (135) 185 (6) 175 (12) 190 (13)
300 (149) 185 (6) 170 (12) 180 (12)
350 (177) 175 (5) 150 (10) 165 (11)
406 (208) 170 (5) 140 1(9) 150 (10)
A
MSS SP-106
B
ASTM B584, UNS C83800 and UNS C84400
C
ASTM B62, UNS C83600 and ASTM B584, UNS C83600
RATED INTERNAL WORKING PRESSURE
1
FOR COPPER FITTINGS, PSI (BAR)
Water Temperature Range
Nominal Water
Tube Size -20° to 100°F 150°F 200°F 250°F 300°F 350°F 400°F
(In Inches) (-29° to 38°C) (66°C) (95°C) (120°C) (149°C) (177°C) (204°C)
1/4 912 (62) 775 (53) 729 (50) 729 (50) 714 (49) 608 (42) 456 (31)
3/8 779 (54) 662 (46) 623 (43) 623 (43) 610 (42) 519 (36) 389 (27)
1/2 722 (50) 613 (42) 577 (40) 577 (40) 565 (39) 481 (33) 361 (25)
5/8 631 (43) 537 (37) 505 (35) 505 (35) 495 (34) 421 (29) 316 (21)
3/4 582 (40) 495 (34) 466 (32) 466 (32) 456 (31) 388 (27) 291 (20)
1 494 (34) 420 (29) 395 (27) 395 (27) 387 (26) 330 (23) 247 (17)
1 1/4 439 (30) 373 (26) 351 (24) 351 (24) 344 (23) 293 (20) 219 (15)
1 1/2 408 (28) 347 (24) 327 (23) 327 (23) 320 (22) 272 (19) 204 (14)
2 364 (25) 309 (21) 291 (20) 291 (20) 285 (20) 242 (17) 182 (13)
2 1/2 336 (23) 285 (20) 269 (19) 269 (19) 263 (18) 224 (15) 168 (12)
3 317 (22) 270 (19) 254 (17) 254 (17) 248 (17) 211 (15) 159 (11)
3 1/2 304 (21) 258 (18) 243 (17) 243 (17) 238 (16) 202 (14) 152 (10)
4 293 (20) 249 (17) 235 (16) 235 (16) 230 (16) 196 (13) 147 (10)
5 269 (19) 229 (16) 215 (15) 215 (15) 211 (15) 179 (12) 135 1(9)
6 251 (17) 213 (15) 201 (14) 201 (14) 196 (14) 167 (12) 125 1(8)
8 270 (19) 230 (16) 216 (15) 216 (15) 212 (15) 180 (12) 135 1(9)
1
The fitting pressure rating applies to the largest opening of the fitting.
U.S. customary units in this document are the standard; the metric units are provided for
reference only. The values stated in each system are not exact equivalents.