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  1. magicking

    Vessel Design for -95¦C Temperature

    Thanks stanweld, The diameter is 20"ID. I've read ASME B&PV Code Section 8 Div 2, it indicates that I can reduce the MDMT to -104°C, as long as the stress ratio is below 0.24 (3.11.2.5). There are 3 equations to calculate stress ratio, which one I should use?
  2. magicking

    Vessel Design for -95¦C Temperature

    If I would like to avoid impact test of the vessel with MDMT = -95°C by using SA-516 Gr 70 material. What is the minimum wall thickness of the vessel to order to meet ASME code? The design pressure is only 50 kPa. Thanks for your help.
  3. magicking

    Potential Problem of Direct Fired Heater for Crude Oil

    Thanks everyone, What is the efficiency of direct fired heater. I know that for indirect fired heater, the efficiency is around 76-81%. Magicking
  4. magicking

    Potential Problem of Direct Fired Heater for Crude Oil

    Hi doct9960, Yes. No, I think the flame will heat the air and the air is impinging on the tubes containing crude oil. Magicking
  5. magicking

    Potential Problem of Direct Fired Heater for Crude Oil

    Hi everyone, My client insists to use direct fired heater to raise the temperature of crude oil but we insist to use indirect fired heater. First Question: Is it acceptable to use direct fired heater for crude oil? Second Question: If it is acceptable, what measures are necessary to allow...
  6. magicking

    Potential Problem of Direct Fired Heater for Crude Oil

    Hi everyone, My client insists to use direct fired heater to raise the temperature of crude oil but we insist to use indirect fired heater. First Question: Is it acceptable to use direct fired heater for crude oil? Second Question: If it is acceptable, what measures are necessary to allow...
  7. magicking

    50% propylene glycol concentration for roof make-up air units

    Just a reminder: higher the percentage of glycol, lower the efficiency of the heat transfer from the coil to the air. But in your case the incoming temperature is only -12°F, 50% glycol will not be significant for the coil size. But in Calgary with -40°F ambient we still use 40% glycol only.
  8. magicking

    Maximum Air Exchange Rate per Hour

    Thanks walkes, I agree with you I need a ceiling mounted diffusers to distrib the air flow. My question is: Based on a common pratrice, what is the max air exchange rate per hour without having any problem?
  9. magicking

    Maximum Air Exchange Rate per Hour

    I have a very small lab which is 12' by 18' with 8' ceiling. My client would like to install some fume hoods inside there. Based on ASHRAE requirement, 10 air exchange per hour minimum is required in the lab area. If that is the case, the minimum supply and exhaust CFM is 288CFM. If I...
  10. magicking

    What is the different between "return 1" and "return"?

    What is the different between "return 1" and "return"?

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