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  1. notsocommonsense

    Maximum hydrogen content before using a toroidal ring on a vent stack

    Hello fellow engineers; I am currently reviewing a relief systems internal standard for a client of ours. In reference to vent stacks, there is a clause saying that any vent stack relieving a gas mixture with over 20 mol% H2 should be fitted with a toroidal ring. I have done considerable web...
  2. notsocommonsense

    Design Temperature - Mean metal temperature

    Folks, AME B31.3 has a table (301.3.2) that says you can use 90% of the process temp as your mean metal temperature conservatively for uninsulated flanges if your process temp exceeds 65 C (150 F). Is there a similar shortcut method for ASME Section VIII vessel nozzle flanges? Other...
  3. notsocommonsense

    Tee Vent with Bevelled Ends for Natural Gas Emergency GTG vent

    Hi, We have designed a 4" bi-directional discharge (tee with 45 bevels facing down with bird screens). The pipe extends 10 feet above a 40 foot roofline. There is a GTG air intake that starts another 10 feet below that. Our dispersion specialists have told us that this is adequate. Couple...
  4. notsocommonsense

    Lean DEA PSV discharge through DEA surge tank roof - Static Concerns

    We added a PSV on our high pressure amine (DEA)pump discharge to satisfy code overpressure requirements for high pressure piping. To meet API 521 requirement for no liquid in PSV discharge line, we raised the PSV and are discharging through an adapred manwaybcovee into the top of the Lean amine...

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