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  1. cryotechnic

    Pump power calculation

    I have the following situation: 3 coolingwaterpumps, 3 different coolingwater users with gascoolers, coolingwaterpressure reading, coolingwaterflowreading. Can I use the formula as mentioned below for calculation of the pump power? We don't have an accurate powerreading on the pumpmotors, but...
  2. cryotechnic

    Optimal adjustment cooling water Turbocompressor

    In order to optimize our cooling water system we are investigating the adjustments of cooling water of our turbocompressor gascoolers. The way we adjust the cooling water till now is: Set the total cooling water flow to a point around the value given by the manufacturer. Balans the cooling water...
  3. cryotechnic

    Reverse osmosis for cooling water blowdown

    I'm working on a review of one of our cooling systems. One of the things is saving on supply water. I’ve been reading about reusing the blow-down water of the cooling tower as supply water. Our system has a blow-down of app. 28 m3/h. In a reusing system, the water is fed through a Reverse...
  4. cryotechnic

    Argon purification

    In our plant we have an Argon purification unit. Crude argon (at about 100mbar) with 2,5% Oxygen is the feed to a waterringpump, then at a pressure of 2,5 bar the crude argon is fed into a DEOXO unit, together with Hydrogen to remove the oxygen from the Argon. From the DEOXO, the gas goes into a...
  5. cryotechnic

    1 booster/expander in use, 1 booster/expander deriming

    In one of our ASU's we have 2 booster/expander combinations in the same air stream. Normally we only have 1 of them in production. We only use both combinations during startup of the plant, or in the case we need much extra liquid. We used to isolate and derime the unused combination. Now, I...
  6. cryotechnic

    Hydrogen limits

    Known is that the LEL/UEL of hydrogen in air is: 4.1%-76% In our plant we have the following mixture: 2,0% Oxygen 4,5% Hydrogen 0,5% Nitrogen 93% Argon Pressure and temperature of this gas mixture: 400dgrC, 4,5barg What is the LEL/UEL in this mixture? Does the temperature and...
  7. cryotechnic

    Construction Gas Cooler

    Most of our turbocompressors have gas intercoolers where the gas is on the outer shell, and the cooling water flows through the pipes. At higher pressures it's the opposite. The water flows through the outer shell, the gas through the pipes. We know and understand the reason. If you would let...
  8. cryotechnic

    inlet guide vanes, 1 or more?

    In our plant we have different compressors, used for air compression and compression of our products. We have a few integrally Geared Compressors. They have all different discharge pressures, capacity and they are used for different products (air, oxygen, nitrogen)they are all from the same...
  9. cryotechnic

    dividing alarms in PCS7

    Recently my company updated the procesautomation of one of our plants. A complete PCS7 system is brought in (PLC and WinCC). In the future they want to run all the other plants also on the PCS7 system. Finaly, to be more flexible, the idea is to have access to all plants at all the existing...
  10. cryotechnic

    Expander, energy, enthalpy

    Hi, In our ASU we have a turbo expander/compressor. The expander is driving the compressor. Now, we are thinking about the energy released at the expander. The energy needed for the compression of a surten amount of gas must be released by the gas in the expander. (for this moment, we are...
  11. cryotechnic

    Expander, Energy, enthalpy,

    Hi, In our ASU we have a turbo expander/compressor. The expander is driving the compressor. Now, we are thinking about the energy released at the expander. The energy needed for the compression of a surten amount of gas must be released by the gas in the expander. (for this moment, we are...
  12. cryotechnic

    Compensation valve compressor/expander combination

    In our plant we have a few compressor/expander combinations to produce cold. The expander is driving the compressor. One of this combinations has a "compensation valve" the use of this valve is clear. At the start-up it compensates the axial forces who are generated by the expander, since the...
  13. cryotechnic

    Compensation valve compressor/expander combination

    In our plant we have a few compressor/expander combinations to produce cold. The expander is driving the compressor. One of this combinations has a "compensation valve" the use of this valve is clear. At the start-up it compensates the axial forces who are generated by the expander, since the...
  14. cryotechnic

    Liquid ring pump

    In our plant we are using a liquid ring pump to compres a gas from 80 mbar up to 4 bar. The pump is a Siemens Elmo, single-stage double acting pump. The complete pump is build of 2 pumphouses, a low-pressure and high-pressure house. The low-pressure pump has a diameter of 50cm and rotates...
  15. cryotechnic

    Properties of Hydrogen.

    If a gas under pressure is expanded to a lower pressure, the tempereature of the gas will drop. One of the properties of hydrogen is that after expansion the temperature of the hydrogen will rise.... Can someone explain this to me? I've read on the internet that Hydrogen has a negative...
  16. cryotechnic

    "wet" regeneration gas molsieve ASU

    Today we faced some problems with our regenerationgas steamheater in our ASU. It appeared that the steamheater was leaking, so the dewpoint of our regenerationgas after the heater was rising (normally -120Cdp, now -30Cdp) Because we have no electricheaters as a backup, we had to shut down the...
  17. cryotechnic

    Molsieve 13X-APG 1/16"

    Does someone know where to find good theoretical information about Molsieve's? (about, the theorie of adsorption, about optimalisation of the molsieve) Can anyone explain the relation between the inlet temperature of (e.g. Air) and the rate of adsorption of CO2, N2O, HC's in the molsieve? Does...
  18. cryotechnic

    speed up the start-up of airsepartion plant

    To reduce the costs and speed-up the start-up of one of our airseparation plants we are calculating if it's worth to pump in liquid once the plant is starting to make liquid. Normally it takes us about 2 and a half day to produce enough liquid to get the first pure products. Our idea is to start...

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