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  1. DanielGong

    consideration of the wetted area of S/T exchanger?

    hi when you calculate the relief load of PSV in fire case, there are vessel and exchanger in one fire circle. The normal operation condition of exchanger is both side liquid (naphtha)or one side two phase. How to decide the wetted area of S/T exchanger? Because there is no NLL or HLL. Shall I...
  2. DanielGong

    NPSHa calculation of pump

    thanks JJpellin:)
  3. DanielGong

    NPSHa calculation of pump

    thanks, 786392:) "Pumping Liquids Loaded With Dissolved Gas" i have found some infomation about the dissolved gas affect the vapor pressure of the pumped flow. may be i do not express clearly! Thanks again!
  4. DanielGong

    NPSHa calculation of pump

    thanks for your answer. the pumped flow is HDO/LVGO,that is the feed of Diesel hydrotreating unit. there is a feed surge drum with nitrogen seal at the top.OT is 149ºC, and the vapor pressure is 0.06kg/cm2a. Does the nitrogen seal have any effect on the calcultion. nitrogen may be saturated in...
  5. DanielGong

    NPSHa calculation of pump

    hi, now i working on the NPSHa calculation for the pump. there is a drum with overhead nitrogen seal at the suction side of pump. how to calculate the NPSHa for the pump? how to considerate the pressure of suction side? use the vapor pressure of the liquid may be not suitble in this case.

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