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Cast Iron Flanged Pipe Fittings - Working Pressures

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

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

Cast iron flanges and fittings - pressure versus temperature rating diagram

Maximum Working Pressure (psig)
Temperature
(oF)
Pressure Class
125250
Pipe Size (inches)
1 - 1214 - 2430 - 481 - 1214 - 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 -

1) For liquid services - flanges only. Materials of construction ASTM A 126 Class B

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