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  1. mrcaptainplanet

    PN325 standard for flanges

    Hi, An old plant I'm dealing with replacing some piping for uses a PN325 standard for its flanges. This is not covered in DIN EN 1092-1, and from what I can tell from my research (read: googling), the PN325 is a company standard made by the now defunct German IG group, and but is still somewhat...
  2. mrcaptainplanet

    Air Ingress to Flare Stack with No Purge Flow

    Hello all I have a question dealing with what will occur if the purge gas to flare system (nitrogen) has a supply failure. The flare is equipped with velocity seal. I see from John Sink and API521 that this describes oxygen levels below the seal as they will rise almost immediately after purge...

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