Flange Pressure and Temperature Ratings, B16.5

The following table is the maximum allowable non-shock pressure and temperature ratings for various flanges:

 

Flange Pressure and Temperature Ratings, B16.5
ANSI Class Temperature oF	Maximum Allowable Non-Shock Pressure PSIG
	150	300	400	600	900	1500	2500
-20 to 100	285	740	985	1480	2220	3705	6170
200	260	680	905	1360	2035	3395	5655
300	230	655	870	1310	1965	3270	5450
400	200	635	845	1265	1900	3170	5280
500	170	605	805	1205	1810	3015	5025
600	140	570	755	1135	1705	2840	4730
650	125	550	730	1100	1650	2745	4575
700	110	530	710	1060	1590	2655	4425
750	95	505	675	1015	1520	2535	4230
800	80	410	550	825	1235	2055	3430
850	65	320	425	535	640	955	2655
900	50	230	305	460	690	1150	1915
950	35	135	185	275	410	685	1145
1000	20	85	115	170	255	430	715

• This table is in accordance with ANSI B16.5 (2003) maximum allowable non-shock pressure (psig) and temperature ratings for Group 1.1 Materials. There are several notes associated with this, and other tables in ASME B16.5 that need to be verified by the engineer prior to specification. For example, A105 is permitted for use over 800°F but not recommended.
• Based on American Society of Mechanical Engineers - ASME B16.5