Cast Iron Flanged Pipe Fittings - Working Pressures vs. Temperature

Maximum working pressures for cast iron flanged pipe fittings according ANSI B16.1.

Maximum Working Pressure (psig)
-20 to 150	200	150	150	500	300
200	190	135	115	460	280
225	180	130	100	440	270
250	175	125	85	415	260
275	170	120	65	395	250
300	165	110	50	375	240
325	155	105	-	355	230
350	150	100	-	335	220
375	145	-	-	315	210
400	140	-	-	290	200
425	130	-	-	270	-
450	125	-	-	250	-

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Cast Iron Flanged Pipe Fittings - Working Pressures vs. Temperature - Maximum working pressures for cast iron flanged pipe fittings according ANSI B16.1.
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Cast Iron Flanged Pipe Fittings - Working Pressures vs. Temperature

Maximum working pressures for cast iron flanged pipe fittings according ANSI B16.1.

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Scientific Online Calculator

Maximum Working Pressure (psig)
Temperature (^oF)	Pressure Class
	125			250
	Pipe Size (inches)
	1 - 12	14 - 24	30 - 48	1 - 12	14 - 24 ¹⁾
-20 to 150	200	150	150	500	300
200	190	135	115	460	280
225	180	130	100	440	270
250	175	125	85	415	260
275	170	120	65	395	250
300	165	110	50	375	240
325	155	105	-	355	230
350	150	100	-	335	220
375	145	-	-	315	210
400	140	-	-	290	200
425	130	-	-	270	-
450	125	-	-	250	-