Powell Valves - Pressure/Temperature Charts

Table 7 - ASTM A351 Grade CF3(a) & ASTM A351 Grade CF8(b)

(a) Not to be used over 800°F
(b) At temperatures over 1000°F, use only when the carbon content is 0.04% or higher. This requirement must be specified by customer when applicable.

Standard Class

Working Pressures by Classes, psig
Temperature, °F	150	300	400	600	900	1500	2500	4500
-20 to 100	275	720	960	1440	2160	3600	6000	10,800
200	230	600	800	1200	1800	3000	5000	9000
300	205	540	720	1080	1620	2700	4500	8100
400	190	495	660	995	1490	2485	4140	7450
500	170	465	620	930	1395	2330	3880	6985
600	140	435	580	875	1310	2185	3640	6550
650	125	430	575	860	1290	2150	3580	6445
700	110	425	565	850	1275	2125	3540	6370
750	95	415	555	830	1245	2075	3460	6230
800	80	405	540	805	1210	2015	3360	6050
850	65	395	530	790	1190	1980	3300	5940
900	50	390	520	780	1165	1945	3240	5830
950	35	380	510	765	1145	1910	3180	5725
1000	20	320	430	640	965	1605	2675	4815
1050	20(1)	310	410	615	925	1545	2570	4630
1100	20(1)	255	345	515	770	1285	2145	3855
1150	20(1)	200	265	400	595	995	1655	2985
1200	20(1)	155	205	310	465	770	1285	2315
1250	20(1)	115	150	225	340	565	945	1695
1300	20(1)	85	115	170	255	430	715	1285
1350	20(1)	60	80	125	185	310	515	925
1400	20(1)	50	65	95	145	240	400	720
1450	15(1)	35	45	70	105	170	285	515
1500	10(1)	25	35	55	80	135	230	410

NOTE: (1) For welding end valves only. Flanged end ratings terminate at 1000°F


Special Class

Working Pressures by Classes, psig
Temperature, °F	150	300	400	600	900	1500	2500	4500
-20 to 100	290	750	1000	1500	2250	3750	6250	11,250
200	255	670	890	1335	2005	3345	5570	10,030
300	230	600	800	1200	1800	3000	5000	9000
400	210	555	735	1105	1660	2765	4605	8295
500	200	520	690	1035	1555	2595	4320	7780
600	185	490	650	975	1465	2440	4065	7315
650	185	480	640	960	1440	2395	3995	7190
700	180	470	630	945	1415	2355	3930	7070
750	175	465	615	925	1390	2315	3855	6945
800	175	450	600	900	1350	2250	3750	6750
850	170	440	580	885	1325	2205	3680	6620
900	165	435	575	865	1300	2165	3605	6495
950	165	425	565	850	1275	2120	3535	6365
1000	155	405	545	815	1220	2035	3395	6105
1050	150	385	515	770	1155	1930	3215	5785
1100	125	320	430	645	965	1605	2680	4820
1150	95	250	330	495	745	1245	2070	3730
1200	75	195	255	385	580	965	1605	2895
1250	55	140	190	285	425	705	1180	2120
1300	40	105	145	215	320	535	895	1605
1350	30	75	105	155	260	385	645	1155
1400	25	60	80	120	180	300	500	900
1450	15	45	55	85	130	215	355	645
1500	15	35	45	70	105	170	285	515

NOTE: Special Class Ratings apply to Threaded and Weld End Valves only and require upgrading per paragraph 8 of ASME B16.34