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  1. ris2

    Switching or air blowers in a fired heater.

    Montemayor, do you think that placing a check valve on the discharge line or fabricating an exhaust pipe upstream of the discharge valve of the blowers is possible. I believe that this would elimimnate opening the discharge valve prior to starting because the standby blower could be started even...
  2. ris2

    Switching or air blowers in a fired heater.

    There are two blowers on the fired heater at our facility. To switch the blowers the heater must be shut down and the standby blower then started. The standby blower cannot be started with the online blower in operation. Once the discharge valve on the standby blower is opened the heater trips...
  3. ris2

    What is the purpose of a phase separator?

    At our facility there is a liquid hydrocarbon stream (mainly heavy hydrocarbons) leaves a vessel at -22degrees celsius and a flowrate of 59 cubic metres/hr. It flows through a level valve which maintains the vessel level and into a heat exchanger. Downstream of the level valve there is a phase...
  4. ris2

    molecular sieve regeneration with "warm nitrogen"

    You can get some information on mol sieves from the John M Campbell Company. The book is Gas conditioning and Processing.
  5. ris2

    Active and inactive thrust bearings

    Can anyone give me some information on active and inactive thrust bearings.I have heard about them but what are they used for?
  6. ris2

    Excess flow check valve versus check valve

    What is the difference between an excess flow check valve and a normal check valve. We have an excess flow check valve in one of our systems and I would like some more information on this valve.
  7. ris2

    Rollover in LNG tanks.

    Thamed57-- My email is rsingh@atlanticlng.com and my fax is 868-648-2905. Thanks.
  8. ris2

    Dry gas seals

    I need some information on dry gas seals. Anyone knows of any sites?
  9. ris2

    Inlet guide vanes

    Can anyone tel me about the use of inlet guide vanes and the advantages of its use. Are there any sites for more information.
  10. ris2

    How can a vaporizer fail?

    Montemayor Our system is bought from Praxair. I will email them for some information. Thanks for your help.
  11. ris2

    How can a vaporizer fail?

    At our facility we vaporize liquid nitrogen from a storage tank with an ambient air vaporizer. How can this vaporizer fail and allow liquid nitrogen into the gaseous notrogen header. Are there any site to check for vaporizer failures.
  12. ris2

    What is the difference between a pressure safety valve (PSV) and a rel

    Can someone indicate the differences in safety valves and relief valves and what each is used for.
  13. ris2

    Double containment storage tanks.

    I would like some information on double containment LNG storage tanks or any links where I could find information.
  14. ris2

    Rollover in LNG tanks.

    Can anyone provide details about rollover in LNG storage tanks and how can it be prevented?
  15. ris2

    flow calculation

    TD2K - No I am not referring to a blowby case. We do not have a flowmeter on the line to the tank and I wish to calculate the flow.
  16. ris2

    flow calculation

    ris2 (Chemical) Mar 4, 2004 I want to calculate the flow rate from a vertical vessel to a closed tank. I know the pressure in the vertical vessel and the line size to the tank. I know also the pressure in the closed tank. What other information do I need and what calculation can I use? There...
  17. ris2

    Flow calculation

    I want to calculate the flow rate from a vertical vessel to a closed tank. I know the pressure in the vertical vessel and the line size to the tank. I know also the pressure in the closed tank. What other information do I need and what calculation can I use? There is a level valve downstream of...
  18. ris2

    What is the relationship between flare purge rate and flare tip size?

    Can anyone answer that question as well as what prevents water from entering the flare system ?
  19. ris2

    Can anyone indiacte any problems with thermosyphon reboilers?

    I am loooking for reduction in efficiency and underperformance in these types of reboilers. Are there any sites I can check for this information?
  20. ris2

    Amine plate exchanger underperformance

    Can someone give me some information or a website to check ? Thanks
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