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Recent content by asghar

  1. asghar

    Isolation Valve on oil/water bridle

    John, The way I look at it is that the extreme switches, LSHH and LSLL, should be independently installed on the vessel. In my case where the existing system has all the switches on the bridle, I was little hasitant to install isolating valves just because of the reason you mentioned...
  2. asghar

    Isolation Valve on oil/water bridle

    Saxon, You have a point. Thanks
  3. asghar

    Isolation Valve on oil/water bridle

    How much is it important to have isolation valves on the main lines feeding the bridle on which level switches and LG are installed which have their own isolation valves. Plant operation reasons out that since the liquid in the bridle remain stagnent therefore becterial growth causes corrosion...
  4. asghar

    Dew Point Calculations

    What should be the maximum height of LSHH (reference to base of drum) of a Flare Knock Out Drum? Say the drum dimensions are 60" x 20'. The 8" inlet is from the dish-end and the centerline of inlet is 12" from the top. I need the basis or general guidelines to set the height of LSHH (at which...
  5. asghar

    Dew Point Calculations

    What would be dew point for air as well as Natural gas, each having Water content: 14 lb/MMscf @85 deg F & 110 psig? How it is calculated?
  6. asghar

    flow through orifice

    hacksaw and Mikeyp; thanks for your input and I will explore the fluid mechanic forum.
  7. asghar

    flow through orifice

    I came up with the 667 scfm the following formula. I believe this volume is at set pressure of 275 and not at downstream pressure (atmospheric). The constants and factors I used from Anderson Greenwood catalog. Am I right in my assumption that the volume is at set point?? A = Area of Orifice...
  8. asghar

    flow through orifice

    Can someone tell me, the gas flow volume through an orifice, calculated from the common formula given by different vendors, is at upstream pressure or downstream pressure?
  9. asghar

    Self Blanketing Tanks

    One of the recommendations in a safety audit suggests to identify crude oil/ condensate storage tank which are 'self blanketed'. The recommendation further explains the criterion for self-blanketing as being “a vapor evaporation rate, which is greater than 1.5 times the maximum pumping draw...
  10. asghar

    Tank Blanketing

    Gas blanketing is generally used in tanks to prevent ingress of Oxygen. API 2000 criterion is normally used to calculate the blanketing gas requirement for petroleum products tanks. A term of “self blanketing” is referred that propagate that any petroleum product(s) whose evaporation rate is...
  11. asghar

    Centrifugal Compressor

    1969grad and stewbaby, This is what I have been asked that it should be a centrifugal compressor. I had made a run on the Processassociates and came up with 3 number of stages but the flow rate has decreased as the stages increased. I have a feeling that I made some boo-boo in runing this...
  12. asghar

    Centrifugal Compressor

    I have to develop specifications for procuring a cetrifugal compressor that should raise the Natural gas pressure from 25 psig to 400 psig. A sample technical spec sheets would be of great help. Any other material or technical advice shall also be appreciated. The Natural Gas Sp. Gr. is 0.65
  13. asghar

    Filter on Gas line to Injection Well

    Olef, I agree to your first point and that is the main reason to have some kind of protection for commissioning the line. Your second point also valid and justified but considering the length of the line to around 3 to 4 KM one can not be sure if there is liquid or not. TD2K: I did recieve...
  14. asghar

    Filter on Gas line to Injection Well

    Olef, The gas fed to the compressor is already filterd and I agree to your point that compressor is more sensitive than the well. There are two resons that we were thinking of: 1) to trap the line conteminents (rust particles and small debries). 2 to trap the heavy ends in case these are...
  15. asghar

    Filter on Gas line to Injection Well

    Another question: what type of check valve could be a better choice on the gas line before the wing valve. I am recommending a Wafer type as swing type check valve may flutter due pulses developed by compressors operation.
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