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  1. IngGasP

    Depressurisation time calculation

    I tried to calculate it using the global energy balance equation as follows: d H+ d Ek+ d Ep= q + (Vm * dP) Assuming air as Ideal Gas and Isentropic transformation and No machine: q = 0 (Vm * dP)=0 d Ep =0 because its effect which is neglected due to very small density of the air We'll have...
  2. IngGasP

    Depressurisation time calculation

    Dear zdas04! The steps described in your message seems to be very interesting, however,I've never work out this type of problem flow . Please could you work it out and send it to me in atteched form in order to show me how. Thanks for your help.
  3. IngGasP

    Depressurisation time calculation

    Hi! I have an air cylinder that is compressed to 150 PSI with a volume of 7.3 cu in. I am trying to find out how long it will take for the 150PSI to vent down to atmospheric pressure through an opening that is 1.77mm in diameter. Greetings
  4. IngGasP

    Process question

    To IRstuff It isn't for school because you're right it seems to be. But what I wanted is to analyse this two questions. The first question deals with writing operation procedure on process eqpt (underway), and I wanted to have someboby having long experience in oil and gas operational...
  5. IngGasP

    Process question

    Hi! 1- If you are starting up a cold steam heater and you hear a noise, what would the action to be taken? 2- What is the difference between spectacle blind and sleep plate? Greetings
  6. IngGasP

    compressor to feed another unit

    Hi! We had a compressor with inlet pressure 14 barg to outlet one 45 barg(design) for feeding gas with(3.0 MM Sm3/d) to LPG plant. we were controlling the pressure in the unit by turboexpander control valve (Completly different from conventional pressure control valve).Now,we're planning to...
  7. IngGasP

    Why propane in refrigeration?

    TD2K Thanks for your answer that's rally helpful. Greetings
  8. IngGasP

    Why propane in refrigeration?

    Hi! Why do they always use propane as coolant in industrial refrigeration loop and not for eg Butane? for eg in our LPG plant. Greetings
  9. IngGasP

    Total charge of coolant

    Hi TD2K! Thanks for your reply but can you explain to me what do you mean by (What is the function of both of them) : estimate an initial charge ??? sort of propane inventory process??? Is there a difference between them? Greetings!
  10. IngGasP

    Total charge of coolant

    Hi! Please is anyone tell me how to compute the total charge of propane used as coolant in refrigeration loop of a LPG plant? Thanks!
  11. IngGasP

    Chemical process optimization

    Hello everybody! Can everybody tell me what does mean process optimization . Does it mean, the best working parameters with low energy consumption or money saving? or is there something else. And what are the stages taken to make a process optimization Please give me some technical support to...
  12. IngGasP

    Regeneration of Molecular sieve bed of dehydration unit

    Hi ChemEngMKH! Could you tell us What sort of problem with the thermal isolation for the heater and the inside of it? Thanks for your professional replies
  13. IngGasP

    Partial pressure calculation

    Hi! I a have hydrocarbon gas mixture whose total pressure is Pt(measured by gage)over 40Barg. Is it correct for computing the partial pressure of components by using this formula: Pi(partial pressure of one component), Yi(molar fraction) Pi= Yi * Pt Thanks
  14. IngGasP

    Total condenser area must greater than partial condenser?

    Hi Latexman! Coud you explain more what do you mean by this statement: The PC starts with very little inerts. The TC has a lot of inerts. Presence of inerts just kills the htc. What stands for HTC and HTRI, and what do you mean by Presence of inerts just kills the htc. Good luck
  15. IngGasP

    Regeneration of Molecular sieve bed of dehydration unit

    Hi! the heater is on all the time what changes is its firing rate through controlling fuel gas flow. So, What about Thermal stress on the concrete of isolation(swinging from hot to cold or vice versa) beacuse in our old plant the working of the heater in intermittant way causes us damages on...
  16. IngGasP

    Regeneration of Molecular sieve bed of dehydration unit

    Hi! the heater is on all the time what changes is its firing rate through controlling fuel gas flow. So, What about Thermal stress on the concrete of isolation(swinging from hot to cold or vice versa) beacuse in our old plant the working of the heater in intermittant way causes us damages on...
  17. IngGasP

    Regeneration of Molecular sieve bed of dehydration unit

    Hi! We have a LPG plant where regeneration(Heating phase) of Molecular sieve bed of dehydration unit is performed by heated gas in mineral oil Shell-tube heat exchanger. However, a new LPG plant where construction is underway and the regeneration of the Molecular sieve bed is performed by the...
  18. IngGasP

    TSHH( Very High temperature discharge compressor shutdown switch)

    Hi ChemEngMKH! I thought first about the head (power per volumetric or massic unit), What is the max. of head supported by compressor? Because the temperature is about 120°C.So, Could the temperature causing thermal damage be the reason of TSHH and not the problem of the head which is...
  19. IngGasP

    TSHH( Very High temperature discharge compressor shutdown switch)

    Hi! I know it's preventing it from damage, but could you explain to me how? Thanks for your replies
  20. IngGasP

    TSHH( Very High temperature discharge compressor shutdown switch)

    Hi! Why do they make a TSHH for centrifugal compressor? Many thanks

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