Powell Valves - Pressure/Temperature Charts

Table 5 - ASTM A217 Grade C12

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	375	505	755	1130	1885	3145	5655
1000	20	255	340	505	760	1270	2115	3805
1050	20(1)	170	230	345	515	855	1430	2570
1100	20(1)	115	150	225	340	565	945	1695
1150	20(1)	75	100	150	225	375	630	1130
1200	20(1)	50	70	105	155	255	430	770

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	2355	3930	7070
1000	120	315	425	635	950	1585	2645	4755
1050	80	215	285	430	645	1070	1785	3215
1100	55	140	190	285	425	710	1180	2120
1150	35	95	125	190	285	470	785	1415
1200	25	65	85	130	195	320	535	965

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