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Recent content by AndreChE

  1. AndreChE

    Sulphur Mercaptans - steam cracking and its effects downstream

    Dear all In a Steam Cracking unit there are Sulphur spec for feedstocks. However sulphur mercaptans don't have, at least at the majority of the plant I know, specification. Do the sulphur mercaptans crack? Are they converted to H2S completely? Are they totally inert to the caustic scrubbing...
  2. AndreChE

    Air Cooled Condenser vacuum testing

    No gaskets since the piping is welded. We did X-ray 100%, penetrating liquids test and pressure test at 500 mbar with air. It was accepted by authorities. Vacuum test to be done in startup of the ACC AndreChE
  3. AndreChE

    Air Cooled Condenser vacuum testing

    Dear all We have recently switched 3 complete cells of our Air Cooled Condenser system. The old ones were cut and new ones were welded. The test that is being done (before plant startup) is a positive leak test. We pressurize the system up to 500-700mbar (design pressure) and check pressure...
  4. AndreChE

    ACC vacuum testing

    Dear all We have recently switched 3 complete cells of our ACC system. The old ones were cut and new ones were welded. The test that is being done (before plant startup) is a positive leak test. We pressurize the system up to 500-700mbar (design pressure) and check pressure loss. However...
  5. AndreChE

    Process plant comissioning & Startup

    Yes, agree. It's not a book reading I'm looking for. I was comissioning engineer for two projects in "my" plant but now I'll be the comissioning manager for the ongoing project. However, my experience is only Steam Cracker. In fact I always disagree on several things in the previous manager...
  6. AndreChE

    Chemical Process Plant Comissioning & Startup

    Dear all I would like to have good information regarding Process Plant Comissioning & Startup. I will be deeply involved in a Steam Cracker major revamp. I already have the book Process Plant Comissioning but I would like to study and compare different approaches. It's not our first big...
  7. AndreChE

    Process plant comissioning & Startup

    Dear all I would like to have good information regarding Process Plant Comissioning & Startup. I will be deeply involved in a Steam Cracker major revamp. I already have the book Process Plant Comissioning but I would like to study and compare different approaches. It's not our first big...
  8. AndreChE

    C2H4 / C3H6 Enthalpy function h(T,P)

    I cannot find any function with Temperature and pressure as independent variables...
  9. AndreChE

    C2H4 / C3H6 Enthalpy function h(T,P)

    Dear all Does any know, for ethylene and propylene, the h(T,P) function without chart/table interpolations? I'm doing an energy balance to put in the DCS to the operators regarding centrifugal ethylene and propylene compressors. Since the first stages discharges are internally mixed with the...
  10. AndreChE

    Ethylene and Propylene Enthalpy function h(T,P)

    Dear all Does any know, for ethylene and propylene, the h(T,P) function without chart/table interpolations? I'm doing an energy balance to put in the DCS to the operators regarding centrifugal ethylene and propylene compressors. Since the first stages discharges are internally mixed with the...
  11. AndreChE

    Reciprocating pump NPSHa

    In fact I was again outside in the plant studying possibilities and then I realised the obvious... In these 160m, I have an heat exchanger that cools down my gasoline to be pumped. This HE works in fact as a buffer and the suction line lenght I should consider is not 160m but around 30m. With...
  12. AndreChE

    Reciprocating pump NPSHa

    We have pulsation dampener in the suction and discharge of the pump.
  13. AndreChE

    Reciprocating pump NPSHa

    Ok, I understood everything except the most important. With a NPSH of 84m (as centrifugal pumps) and a calculated acceleration head of 89m, my pump as pulsation dampener. For a 4m required NPSH will the pump work without vapour space or not? Does in fact this acceleration head reduces my +84m...
  14. AndreChE

    VLE Data Acetone, Methanol, Water

    Use AspenHysys or AspenPlus
  15. AndreChE

    PSVs vented to atmoshpere

    The final ethylene storage, for example, at the harbour is at -104ºC. Intermediate storage is under pressure, depending on the consumers processes. However, you cannot storage at exact atmospheric pressure, you need to control its pressure around 40-60 mbar above atm pressure, giving enough DP...
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