-=> Quoting Jay Hanig to Achim Lohse <=-
  ....
 JH> A relatively new overpressure relif valve ought to blow about 1000 psi
 JH> above the rated pressure of the tank.  A tank that has been filled and
 JH> emptied many times will blow (its burst disk) sooner. 
  Thanks Jay. I'm going to be more careful in future.
  Achim
  Achim Lohse...Box2250, Invermere BC, V0A 1KO
  lohse@rockies.net/a.lohse@netcom.ca
  FAX: 604-342-0404
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