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Why ASME expansion tank

Michael Wagoner_2
Michael Wagoner_2 Member Posts: 6
in THE MAIN WALL
I understand that if a commercial boiler comes with a 50lb relief valve the expansion tank needs to be ASME rated.  if we put a 30lb relief valve on based on the boiler's btu/h rating, since the system pressure is only going to be around 15lbs, why can't we use a standard expansion tank?  does it have to do with the system's btu/h rating as well?

Comments

  • bob_46
    bob_46 Member Posts: 813
    Codes

    Depends on local and state codes.

    There was an error rendering this rich post.

  • Steve Whitbeck
    Steve Whitbeck Member Posts: 669
    ASME

    I believe it is because the boiler is rated for 50# and someone could install a 50# relief valve in the future.
  • Steve Whitbeck
    Steve Whitbeck Member Posts: 669
    edited February 2010
    ASME

This discussion has been closed.

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