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Cast Iron Threaded Pipe Fittings - Working Pressures

Maximum working pressure of cast iron pipe fittings - threaded fittings according ANSI B16.4

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The maximum working pressure of cast iron pipe fittings - threaded fittings according ANSI B16.4 can be found from the table below.

Maximum Working Pressure (psig)
Temperature
(oF)
Pressure Class
125 250
-20 up to 150 175 400
200 165 370
250 150 340
300 140 310
350 125 280
400 - 250

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