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  1. Montemayor

    TEG / Water Boiler

    TEG doesn't start to "degrade" until it gets to 400+ oF, so if you are keeping the TEG as a heating medium under 400 oF, you normally should have no problems. Of course, I don't know exactly how you plan to obtain the TEG at that temperature and where it is going. Normally, I would expect a...
  2. Montemayor

    TEG / Water Boiler

    You seem to have a simple project. However, you don’t tell us key information: where are you located and what capacity of steam generation are you designing for? What you are trying to describe is lost in your description of a TEG natural gas dehydrating reboiler. To answer your first...
  3. Montemayor

    Help needed

    dcasto is correct in asserting that the condenser of a pure fluid cannot be subcooled. By definition a subcooled fluid is one that is condensed and subsequently cooled to a temperature BELOW its saturation temperature. This cannot happen to a pure fluid that is condensed in a closed system...
  4. Montemayor

    piston rod reversal

    waqasmalik If you are “new” to reciprocating compressors and need to know about them, then you should purchase a copy of the GPSA Engineering Databook and read Chapter 13, Compressors and Expanders – from whence I quote: Rod Loading Each compressor frame has definite limitations as to maximum...
  5. Montemayor

    Standards/Guidance on the maintenace of liquid ring compressors

    Through all the years I operated Liquid Ring compressors as both vacuum and compression devices, all I ever carried in stock were shaft seals. The machine is inherently maintenance free due to the use of the liquid piston and lack of any metal-to-metal contact with the exception of bearings and...
  6. Montemayor

    Recommended pump for permanganate solution (J-88L)

    For many years I pumped both caustic soda (Sodium Hydroxide) and Potassium Permanganate solution around packed towers, while processing compressed gases to remove such impurities as CO2 and organic compounds. All I ever used were Cast Iron centrifugal pumps (both casing and impeller) and I...
  7. Montemayor

    How to determine the required blanketing gas rate

    I do not believe that the worst case scenario is when the tank is almost empty, sitting in the hot sun, and then being hit with rain. That case is valid for a CONDENSING film heat transfer coefficient. This is not a condensing case inside the tank. When the tank is almost empty and has a...
  8. Montemayor

    CO2 Vaporizer Control Valve

    The quickest and most accurate way to describe an engineering process system is with a sketch. Please refer to the attached sketch and see what I mean by a liquid CO2 vaporizer as it is used in most industrial applications. The system shown maintains the design operating pressure of the Liquid...
  9. Montemayor

    CO2 Vaporizer Control Valve

    I've designed and built a lot of liquid CO2 vaporizers in my youth. The typical design - whether you use steam or electrical heaters to add the latent heat of vaporization - always is done with the CO2 liquid in the saturated state while it is in the storage tank. This means that the saturated...
  10. Montemayor

    Desiccant Air Dryers

    ProcessRookie (Chemical) Your query is how to arrive at the required flow rate of regeneration gas required to carry out the regeneration of one of the adsorbent beds in your air dryer unit. Am I correct? In order to do that, you have to identify the following: • The size of the adsorbent...
  11. Montemayor

    Gear Pump supplier

    I agree with micalbrch's recommendation. Roper's specialty is heavy-duty gear pumps for heavy and viscous petroleum-based liquids. They make a good pump and their reputation is based on their performance. Go to: http://www.roperpumps.com/roperpumps/ProductsTax.aspx?TaxID=202&id=151
  12. Montemayor

    Reciprocating compressors or centrifugal compressors?

    As TD2K infers, this is a "no-brainer" type of application. Obviously your "designers" were not even born (nor are they aware) when all natural gas field producers used reciprocating compressors. And this was done successfully in the USA through 2 major world war production efforts - without...
  13. Montemayor

    Double Pipe Heat Exchager design Code

    There is no "code" for designing or fabricating a double pipe heat exchanger. As Moltenmetal states, the usual practice is to treat such an assembly as piping and falling within the applicable piping codes and specifications.
  14. Montemayor

    Cooling a body of oil with dry ice

    Just to clear up a few facts: CO2 liquid solidifies into "fluffy", solid CO2 snow. It DOES NOT CONDENSE into a white solid called dry ice. In order to make dry ice, the CO2 snow must be compressed into solid blocks or pellets. Otherwise, it will scatter all over the place. Additionally, the...
  15. Montemayor

    Chemical Engineering Calculations for Pressure Vessels

    5997: Regarding your pump query: Are you a chemical engineering student or a non-degreed "engineer"? The answer to this very basic question is NO!
  16. Montemayor

    CO2 removal optimisation

    ...have any. You can't increase the acid gas loading in the Rich solution and you can't strip beyond the stated Lean solution limits, so you are #$%@** as far as doing anything with your solution to increase capacity. All you are really left with is increasing the solution flow rate. But to do...
  17. Montemayor

    PIPE SIZING (DIAMETER)

    You have your calculation methodology all mixed up. Process Engineers determine the size of pipe required for their process design based on the allowable pressure drop and the recommended fluid velocity. The pipe size specification is subsequently usually turned over to a mechanical engineer...
  18. Montemayor

    Tank level Calculation

    You state you have calculated the 90% level and you bring up the Bernoulli equation. One has absolutely nothing to do with the other. You basically have a Strapping problem. Go to the following website and download a workbook titled "Vessel Volumes"...
  19. Montemayor

    Propane gas specific heat - variation with temp

    Mort: You are absolutely correct. I'm sorry if I didn't stress the fact that enthalpy and entropy can be different values under different databases - and still be correct. It is the difference between these State Values that is the same. I thought the OP would take note of the statement I...
  20. Montemayor

    Propane gas specific heat - variation with temp

    Marcosdias: You are obviously all mixed up in your basic Thermodynamics (as well as fuel combustion). It is far wiser to stop trying to understand an accurate thermo database - such as NIST - and go back to basics, studying what Enthalpy, Entropy, and Heats of Combustion are and how they are...

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