Powell Valves - Pressure/Temperature Charts

Table 6 - ASTM A217 Grade C12A

Use normalized and tempered material only.

Standard 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	260	750	1000	1500	2250	3750	6250	11,250
300	230	730	970	1455	2185	3640	6070	10,925
400	200	705	940	1410	2115	3530	5880	10,585
500	170	665	885	1330	1995	3325	5540	9965
600	140	605	805	1210	1815	3025	5040	9070
650	125	590	785	1175	1765	2940	4905	8825
700	110	570	755	1135	1705	2840	4730	8515
750	95	530	710	1065	1595	2660	4430	7970
800	80	510	675	1015	1525	2540	4230	7610
850	65	485	650	975	1460	2435	4060	7305
900	50	450	600	900	1350	2245	3745	6740
950	35	385	515	775	1160	1930	3220	5795
1000	20	365	485	725	1090	1820	3030	5450
1050	20(1)	360	480	720	1080	1800	3000	5400
1100	20(1)	300	400	605	905	1510	2515	4525
1150	20(1)	225	295	445	670	1115	1855	3345
1200	20(1)	145	190	290	430	720	1200	2160

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	290	750	1000	1500	2250	3750	6250	11,250
300	290	750	1000	1500	2250	3750	6250	11,250
400	290	750	1000	1500	2250	3750	6250	11,250
500	290	750	1000	1500	2250	3750	6250	11,250
600	290	750	1000	1500	2250	3750	6250	11,250
650	290	750	1000	1500	2250	3750	6250	11,250
700	280	735	980	1465	2200	3665	6110	10,995
750	280	730	970	1460	2185	3645	6070	10,930
800	275	720	960	1440	2160	3600	6000	10,800
850	260	680	905	1355	2030	3385	5645	10,160
900	230	600	800	1200	1800	3000	5000	9000
950	180	470	630	945	1415	2360	3930	7070
1000	160	420	560	840	1260	2105	3505	6310
1050	160	420	560	840	1260	2105	3505	6310
1100	145	375	505	755	1130	1885	3145	5655
1150	195	280	370	555	835	1395	2320	4180
1200	70	180	240	360	540	900	1500	2700

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