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  1. NTCIINC

    deriming ASU plant

    Dear Cryotechnic, Many thanks for the valuable tip on deriming the falling film vaporizers. NTCI, Inc. www.ntciinc.com
  2. NTCIINC

    speed up the start-up of airsepartion plant

    Dear Cryotechnic, Answering to your questions: 1. What was meant by "Do not try to build a level in your condenser by liquid injection, otherwise you risk freezing your turbine" is what you interpreted: if too much liquid nitrogen is injected at once, the heat balance is shifted in the main...
  3. NTCIINC

    Looking for Paul Chemical Co.

    Hi Larry, I believe Airco was bought by British Oxygen in the early to mid 90's. Never heard of Paul Chemical Company, you may want to post a question at the Cryogenic Society of America: www.cryogenicsociety.org Sincerely, NTCI, Inc. www.ntciinc.com
  4. NTCIINC

    Dewar Fabricators

    You can also try Cryogenic Technical Services (CTS), their url is www.cryo.com NTCI, Inc. www.ntciinc.com
  5. NTCIINC

    Liquid Hydrogen

    You are not too far off! At atmospheric pressure I calculated an enthalpy difference of 4459.2 KJ/Kg. Good job!
  6. NTCIINC

    OLD STOCK MOLECULAR SIEVE! IS IT OK TO USE ??

    There should not be any problem using the 13X molesieve, especially if it has been stored in sealed containers. Tests to run: mechanical hardness and adsorption capacity. I do not have the specs in mind but, basically make sure the 13x does not crumble. Adsorbtion can be restored with a good...
  7. NTCIINC

    Textbook recommendation

    There is a great book: Cryogenic Process Engineering, written by Klaus Timmerhaus and Thomas M. Flynn. Plenum Press. ISBN 0-306-43283-8
  8. NTCIINC

    problem about cryogenic separation & Heat exchanger analysis

    When dealing with two phase, your best option might be to use enthalpies. Did this help?
  9. NTCIINC

    speed up the start-up of airsepartion plant

    Dear Cryotechnic, Three things about speeding up the plant cooldown: 1. Start your plant at 75% air and product flow capacities. Do not try to start at 100% capacity or your plant will act as a yoyo. 2. Raise you upper column pressure (carefull with the safety settings) so that when liquid...
  10. NTCIINC

    deriming ASU plant

    Dear Wilmers, Deriming an ASU is performed in three steps: 1. Warm up the cold box 2. Dry the cold box 3. cool down the cold box for re-start 1. WARMING THE COLD BOX: Reduce your air flow and shut down the expander Dump your liquids from the columns Open all the liquid and gas purges on the...
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