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  1. krecian

    how to dry diesel with rock salt

    thanks all of you... the inputs were useful.. krecian
  2. krecian

    how to dry diesel with rock salt

    can anyone help me in finding a manufacturer/package vendor who can design and supply diesel drying system using rock salts? diesel is having residual moisture, approx 500 ppm, (coming out from a co-alescer) to be dried to say 100 ppm. krecian
  3. krecian

    Foundation Fieldbus related issues

    Well, thanks, vvec and controlnovice. That's some more value-addition. krecian
  4. krecian

    Foundation Fieldbus related issues

    Thanks very much, controlnovice and Rheinhardt for your inputs. Yes, I am going to work on a new FF system for a gas processing plant. My questions were with the intent of knowing operational/maint related issues that can be taken care during the initial design/engg stage. KRECian
  5. krecian

    Foundation Fieldbus related issues

    Has anybody come across the following in real life FF system, 1. what type of hardware failures are normally observed? 2. what is the avergae number of devices that are practically installed per segment? 3. what is the average power drawn per device? 4. are there any specific failures related...
  6. krecian

    4-20mA to Fieldbus converter

    As far as I know there is no such thing as converter that I can put inside a "panel" and convert analog signals to fieldbus. If you have a control system already existing with fieldbus and your field devices are analogue without fieldbus capability, then there should be HART protocol co-existing...
  7. krecian

    whata are local and remote I/Os?

    Thanks one and all. For quick responses. krecian
  8. krecian

    whata are local and remote I/Os?

    Can somebody simplify the difference between local and remote I/O s to a layman?
  9. krecian

    VALVE STEM SEALING

    you cant afford invisible leaks of gases at such low temperatures which expand nearly 600 times. Go for bellow-sealed valves. KRECian
  10. krecian

    cryogenic separation of natural gas

    What do you want to do with this feed? What components you want to separate. First decide on the objectives. Here are some steps: 1. Dry the gas - moisture removal using silica gel or mol seives 2. Remove arsenic or mercury, if present 3. Remove acid gases - H2S etc - (Amine treating?) 4. Remove...
  11. krecian

    Nitrogen in LPG tank

    Depending on local safety regulations, sometimes N2 is added deliberately to dilute the calorific value of the gas. This is for the gas transported through pipes. - To limit the calorific value within soecified range. Find out your local norms and see if it so. KRECian
  12. krecian

    control loop enquiry

    MayMay, You say it is a batch fermentation. Have a level switch at the desired level (a level transmitter would be better) to actuate the feed control valve. For maintaing constant pressure, on the gas side, have a control valve actuated by a pressure transmitter mounted on the vessel vapor...
  13. krecian

    Product buildup in Surge Hopper

    Wizard74, Check-up whether "bridge" formation is taking place at the conical bottom preventing the plastics flow to the bottom and to the RV itself. KRECian
  14. krecian

    Acetic acid recovery-boil-out-condense?

    25362, Thanks. My calcs are giving me 0.47 kW/m2.K. Specs are all ready for system fabrication and then erection. Let us see how close we are. KRECian
  15. krecian

    Acetic acid recovery-boil-out-condense?

    Thanks 25362, My calculations give me 1.2 W/m2.K. Close to the values given by you. But, boil-out is not a problem for me. Based on rough-cut design and actual fabrication and use, have told us that calculations are more than adequate. Condensation design often seems to be inadequate. I tried...
  16. krecian

    Acetic acid recovery-boil-out-condense?

    I have to design a kettle reboiler for boiling-off 28% acetic acid which contains some salts and no other liquids. Rate: 250 kg/h. Monstinski pool boiling equation gives absurdly high area requirements. Help!!? (I have no simulators or Sw. Only spreadsheets) The condenser has cooling water in 35...
  17. krecian

    "Magic" water descalers?

    We have used both magnetic and so called 'electric' external as well as in-line devices. Dont trust them. It will be big disappointment.
  18. krecian

    Practical Cooling Tower Range

    JoeChem, As the folks have already suggested: 1. consider using heat recovery exchanger before sending the hot water to CT. Reduce the temperature to manageable range 2. Increase water flow rate in the condensers to reduce CT inlet temperature 3. Evaporation losses will be 8-10 % if your CT...

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