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  1. farzinchemical

    where to find hysys tutorials online

    hello everyone, can anyone tell me where i can find hysys dynamic chemical tutorial online? thanks
  2. farzinchemical

    PSV orifice area

    hello again, i did as montemayor advised. we made another visit to the site and realized that the PSVs actually installed were not at the same size written on the non-asbuild P&IDs. they were much smaller. of course non of them were 0.44 in2. I repeated my calculations with 300 btu/lb...
  3. farzinchemical

    gate valves for control sets on gas lines

    thanks david, I will remember your advice.
  4. farzinchemical

    PSV orifice area

    thanks montemayor and guidoo, actually i have studied the fire case as well. assuming: 1. oil outlet blocked. 2. oil inlet blocked. 3. gas outlet blocked. 4. liquid level at normal operating level. 5. conservative latent heat of vaporization, 50 btu/lb(hysys calculates 300 btu/lb for the first...
  5. farzinchemical

    PSV orifice area

    thankyou very much montemayor, i realize that you have spent a lot of time answering my rather preliminary questions and i want you to know i am very grateful in this regard. i hope that i would someday have the privilede of being a part of a team which is conducted by an experienced engineer...
  6. farzinchemical

    PSV orifice area

    thanks again everyone, especially meontemayor. unfortunately there is no datasheet for the existing PSV's. the existing unit is 30 years old and the scenarios for PSV sizings is not known. all we have is what we can read on the non-asbuilt P&ID's. all we know is what has been written on the...
  7. farzinchemical

    PSV orifice area

    thankyou everybody, I am surely not experienced enough. oherwise i would not ask for help. let me give more details. it is an oil-gas separator operating at 370 psig. MAWP is 450 psig. set press. 450 psig allowed overpress. 10% gas outflow at steady state 6.7 MMSCFD oil inflow at steady...
  8. farzinchemical

    PSV orifice area

    hi everybody I have sized a PSV. the calculated area is very small (0.44 sqin). the PSV's on a similar existing installation are 11 sqin. can anyone give a hint?
  9. farzinchemical

    gate valves for control sets on gas lines

    zdas04 you are very funny. it is an 8 inch line and is the outlet from a oil-gas separator. the isolating valves are part of the PSV's control set. i dont know whether a gate valve can be tightly sealed or not. thanks farzin.
  10. farzinchemical

    gate valves for control sets on gas lines

    can i use gate valves for isolating a PCV used in a natural gas line?
  11. farzinchemical

    psv on oil-gas separators

    hello everyone, I have to size a safety valve for a new wellhead separator which is to be added to a set of separators in an existing surface production unit. my calculations for orifice size determination has been based on a blocked outlet case. compared to the orifice size of the psv's...

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