PRESSURE AND TEMPERATURE RATINGS

Maximum Allowable Non-Shock Pressure, psig.
ANSI/ASME B 16.34-1988

Class 150, 300, & 600

Service Temperature		Class 150					Class 300					Class 600
°F	°C	WCB (a)	WC1 (b)	WC6 (c)	WC9 (c)	C5	WCB (a)	WC1 (b)	WC6 (c)	WC9 (c)	C5	WCB (a)	WC1 (b)	WC6 (c)	WC9 (c)	C5
-20 to 100 200 300	-29 to 38 93 149	285 260 230	265 260 230	290 260 230	290 260 230	290 260 230	740 675 655	695 680 655	750 710 675	750 715 675	750 750 730	1480 1350 1315	1390 1360 1305	1500 1425 1345	1500 1430 1355	1500 1500 1455
400 500 600	204 260 316	200 170 140	200 170 140	200 170 140	200 170 140	200 170 140	635 600 550	640 620 605	660 640 605	650 640 605	705 665 605	1270 1200 1095	1280 1245 1210	1315 1285 1210	1295 1280 1210	1410 1330 1210
650 700 750	343 371 399	125 110 95	125 110 95	125 110 95	125 110 95	125 110 95	535 535 505	590 570 530	590 570 530	590 570 530	590 570 530	1075 1065 1010	1175 1135 1065	1175 1135 1065	1175 1135 1065	1175 1135 1065
800 850 900	427 454 482	80 65 50	80 65 50	80 65 50	80 65 50	80 65 50	410 270 170	510 485 450	510 485 450	510 485 450	500 440 355	825 535 345	1015 975 900	1015 975 900	1015 975 900	995 880 705
950 1000 1050	510 538 566	35 20	35 20	35 20 20*	35 20 20*	35 20 20*	105 50	280 165	380 225 140	380 270 200	260 190 140	205 105	560 330	755 445 275	755 535 400	520 385 280
1100 1150 1200	593 621 649			20*	20*	20* 20* 20*			95	115	105 70 45			190	225	205 140 90
Hydrostatic Shell Test Pressure		450	400	450			1125	1050	1125			2225	2100	2250
Valve Closure Test Pressure	Fluid	314	292	319			814	765	825			1628	1529	1650
	Gas	80					80					80

Notes: (a)—Permissible, but not recommended for prolonged usage above about 427°C (800°F).
(b)—Permissible, but not recommended for prolonged usage above about 454°C (850°F).
(c)—Not to be used over 1100°F.
* For welded end valves only. Flanged end ratings terminate at 538°C (1000°F).