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Recent content by Whatsanolet

  1. W

    Orifice for dump line to liquid tank

    Thanks for the detailed reply. I was initially thinking along the lines of calculating like a relief but, thought that since the orifice would be in pipe maybe is more like a meter tube and the AGA-3 method might be a better model. Different compressor station but, still glad to see the URS...
  2. W

    Orifice for dump line to liquid tank

    Thanks Littleinch but, this would be an abnormal condition where the dump valve is stuck open and there would be ~ 1480psig on the upstream side of the orifice and atmospheric pressure on the downstream side. I think this would result in critical flow. Thanks for the links, I will check those out.
  3. W

    Orifice for dump line to liquid tank

    Thanks for your reply. It was suggested to use the AGA-3 method to size the orifice to achieve a flow rate less than the tanks flame arrestor relieving capacity. Is the AGA-3 equation a good approximation for flow rate in this case?
  4. W

    Orifice for dump line to liquid tank

    Thank you. I’m not sure I can share a P&ID so let’s go with no on that. There is a flange at the spec break where piping design changes from 600 class to 150 class which is where I believe the orifice should go. Ideally, the vendor would do it but this was done 11 years ago and URS is no...
  5. W

    Orifice for dump line to liquid tank

    Hi All, I have a natural gas compressor site where the liquid dump lines from the sumps on natural gas scrubbers are plumbed into an atmospheric liquids holding tank. Some of the lines have restricting orifice plates and others don’t. Are the orifice plates needed/required? I was told they...
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