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  1. reena1957

    Amount of heat required to produce 50 psig in pipe with water in it

    Using simple partial pressure rules, one can calculate the vapor pressure of water vapor to be added to the initial air(and a small water pressure). I got 137.7 Deg C as the temperature to which water has to be heated to produce the 50psig total pressure. By calculating the number of moles of...
  2. reena1957

    Cooling capacity of chiller and heat load calculation

    Dear JP, The title of book is right. If the cooling medium is water -glycol mixture, then it is constant inlet temperature to your vessel and a variable outlet temperature case. Get the formuls from Kern and use it. You will also need the overall heat transfer coefft,area of the coil, specific...
  3. reena1957

    Cooling capacity of chiller and heat load calculation

    Dear Jigneshpadia, Your problem is under" Batch Heat Transfer", handled using Kern's famous Heat transfer book with the same chapter title. You have not specified whether your chiller is constsnt boiling refrigerant ( at -20Deg C OR at 0 Deg C) OR a chilled water system with constant inlet...
  4. reena1957

    Process water system surge .. not possible.

    Kudos to Big Inch!! Spoken like a true blue blooded engineer!! I am with you Big Inch 100% Reena
  5. reena1957

    Aspect ratio range for storage tank

    Dear megeng, As per my experience: 1. For small tanks start from 1:1 to 1:2 2. Larger field fabricated tanks of >5000 KL capacity, fix height based on a.soil bearing strength, b.seismic considerations. Normally limited to about 20 meters. Best wishes Reena
  6. reena1957

    Bypass for big sized Control valves

    Hi, Thanks for all your suggestions. We will not be able to control with a gate valve on bypass. We are now proceeding with two 50% CVs in parallel which will open progressively (one after the other) and also a gate valve bypass for 50% flow(normally closed when both CVs are available and open...
  7. reena1957

    Bypass for big sized Control valves

    It is the Rich Amine Flash drum LCV feeding to the Amine regenerator at/very near the regenerator feed nozzle with about 10% flashing occuring d/s of control valve. A tough corrosive erosive service with two phase flow. Thanks to all who responded.
  8. reena1957

    Bypass for big sized Control valves

    Dear itdepends, This is a bypass required for maintenance. Further, do we add one more bypass valve (small size) for opearting the hand wheeled CV or the big bypass valve, especially "when the valve(both CV and bypass) is closed and we want to open it"
  9. reena1957

    Bypass for big sized Control valves

    Hi,We are designing one of the biggest units which has control valves of size 20inches and above. The in-house standards do not allow globe valves on the bypass as they are very big but only allow gate valves which will not help in throtlling the flow. One solution suggested is to go for two 50%...
  10. reena1957

    MDEA Amine regenerator unit filters-propritary vs conventional

    Ivegotgas, Thanks with 2 stars!!! Reenz
  11. reena1957

    MDEA Amine regenerator unit filters-propritary vs conventional

    Dear ivegotgas, Your replies were really good and to the point. May I repeat my request for some carbon filtration data such as how much carbon for how much MDEA flow rate? Effect of temperature say 65 to 45 deg C? Thanks in advance Reena
  12. reena1957

    MDEA Amine regenerator unit filters-propritary vs conventional

    Dear Sino, There is a mechanical filter in front but it is followed by carbon filter to remove the entrained hydrocarbons. Any idea on how much carbon is required and the optimum temperature of adsorption? Thanks in advance
  13. reena1957

    Confused about liquid seal pressure

    This appears to be Gap type split range type of control- Nitrogen make-up if pressure is less than 0.5psi. AND vent through the seal if pressure is more than 1psi. No ation between 0.5 psi to 1.0 psi. If the vapor pressure is pressure is less than 0.5psi , you will see no swing as Nitrogen...
  14. reena1957

    Need your help

    Dear Koshyeng, For Gas blow by to occur, Pressure not be too high but say the pressure differential between two tanks is sufficient to overcome the static head. Sometimes a vertical "S" Liquid loop is provided between such tranferring vessels/tanks as a Liquid Seal so that even at the highest...
  15. reena1957

    Need your help

    You have to check the points raised by 25362. The safety aspect of the other tank should not be compromised in case liquid seal breaks and gas blowby occurs. Other than that the Nitrogen regulator sizing has to be checked for the new pr drop condition. Best wishes Reena
  16. reena1957

    MDEA Amine regenerator unit filters-propritary vs conventional

    Dear All, Currently we are designing a MDEA Amine regenerator unit. The Amine is coming from VGO Hydrotreating ubit with 0.4mole Hes loading.We are doing the conventional filter system(Mechanical 5 micron pre and post filters ad Carbon filter on a 10% side stream-only 5% thru carbon) but are...
  17. reena1957

    Floating Roof Tank Overflow Protection

    IFRs, you are 100% right. It is not at all astraight forward overflow nozzle as others have indicated. BEWARE of simple solutions. More often than not, they may lead to major problems!!!!
  18. reena1957

    Not Considered items in Hazop study??

    Friends, I recently came across a HAZOP study which included the following in NOT CONSIDERED list: 1. Failures of Manual valves 2. Operator Error 3. Passing of NRVs and PSVs Is it OK? Pl give your views. Thanks in advance.
  19. reena1957

    Any design tips for better friendly troublefree MDEA Amine Regen unit?

    Guys, thanks for responding to my last query on MDEA max reboiler temperature. But will anybody help with some info OR articles/ references on design tips for MDEA regenerator improved friendly troublefree operation?? Thanks in advance
  20. reena1957

    What is the reboiler steam temperature for MDEA amine regeneration ?

    dear dcasto. Thanks for the prompt reply. Though direct fired heaters will be ideal for us(70MW heat duty), we have been warned not to touch direct fired heaters due to high skin. Sorry I posted this question here instead of the ch E design forum. Can you pl paste yr reply there and continue...

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