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Schedule 40 welded carbon steel pipe (black) is rated at a working pressure of 150 psi. It should be printed on it. Schedule 80 welded is rated at 300 psi. If U want higher rated piping you must use seamless (not welded) pipe. Hope this helps!

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15y ago
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Q: What is the pressure rating of a 2 inch. and a 4 inch schedule 40 carbon steel pipe at 70 degree Fahrenheit?
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