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  1. shoffman83

    Dehydration of carbon dioxide for oil field injection

    We have a similar gas misture and do dehydrate to 7 lbs/MMSCFD. C/S on pipleines and well heads. Everything works pretty good. Some good stuff in GPSA on this, you should read. Freewater would be bad for the piping, so the first post of checking cooled saturated temperatures is worthwhile...
  2. shoffman83

    Which is best? Vaporization in last exchanger or Control Valve?

    Y'all have nailed it. We have this situation in a pressure swing amine unit, and the control valve is the place to take the brunt. Some thoughts: 1. Using a well type choke valve which is designed for handling multi-phase flows? (Right angle control valve with a bean). 2. Considered using...
  3. shoffman83

    Oily Water Skimmer Separator has problem of Oil Accumulation

    Did I here desalter? Have the lamella plates ever been changed? Are they so pitted from years of operations that the oil has soemthing to grab onto? And if the salt build up is bad, you could be generating an emmulsion rather than breaking it. (thus the higher oil content in discharge versus...
  4. shoffman83

    HYSYS pipeline elevation profile.

    4000 points is going to be very painful in any program. Why so many? YOu better plan on letting the model run for a very long time. (days maybe?) And with that many transitions (not knowing what you are flowing) and that long of a run, and that many changes, is Hysys the right tool? (Olga?)...
  5. shoffman83

    Instrument air backup control

    A self contained regulator on the back-up line is the most cost effective, and VERY reliable method. Used through-out the industry for this service. But an upgrade if you like would be to user a transmitter controlling a control valve. Question you would then have is which way to fail the...
  6. shoffman83

    High CO2 H2S TEG Dehydration MOC

    I agree with Grampi that CS would be fine if things operate correctly. (realize that I am not addressing the upstream scrubber in this statement that normally proceeds a TEG contactor). However, in a high C02 Environ (98%, 3% H2S), I have seen two contactors made from 304L SS operating with no...
  7. shoffman83

    River Sand versus flint for Blasting Material

    We have a proposal for several heat exchangers (some carbon, some Stainless). The proposed blast material from the vendors is processed river sand. We asked for flint. The supplier has a considerable mark-up for this requirement. I think I know the issues between the two media, but am...
  8. shoffman83

    About gate Double Block and Bleed Valve

    Actually, this is also known as an expanding gate valve, and what it allows is yuou to exacuate (bleed) the valve between the two gates. WKM Pow-R-Seal is an example.

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