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    • #274520
      Avatar photocrazyman

        What is that maximum operating pressure of a closed system at operating temperature?

      • #289896
        Avatar photoSylvanLMP

          Hi Bob, are you asking from a code stand point?

          The ASME section IV states a hot water system is considered LOW pressure @160 PSI @ 250 degrees and steam anything over 15 PSI is considered high pressure.

          You can also check out the National Board Of Boiler Inspectors publications (NBBI)

          Now remember you had better check the actual boiler/pressure vessel rating and know as temperature increases so does the pressure

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