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  1. fwcatr

    correlation between gases and liquids Cv

    vahid.z Sizing exercise would determine the suitability of the chosen valve with the stated process conditions, to ensure valve is not undersized or oversized.
  2. fwcatr

    correlation between gases and liquids Cv

    vahid.z Go through the sizing exercise for compressible fluid Can use the previously stated reference by Danlap, the control valve handbook http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf
  3. fwcatr

    correlation between gases and liquids Cv

    Vahid.z Yes, you can do a Cv test using water even if your valve will be installed in an air application. Have you completed a compressible fluid sizing?
  4. fwcatr

    correlation between gases and liquids Cv

    vahid.z If I am understanding your question correctly, it is possible to conduct a Cv test using water and using air. The air test can be tricky though as you need to have very low pressure drop ratios. There are some cases where the water Cv and the air Cv can be close, but there are also...
  5. fwcatr

    Cv determination testing in Chicago area

    I second the prior posts, Alden is capable of flow testing a 12" valve, so is Utah Water Research Lab. I have worked with both of those places and they know what they are doing. If the valves are Fisher designs, contact a Fisher representative and see if you can get them tested at the new...
  6. fwcatr

    Thread type in a Threadolet

    As you may already know, ASME B1.20.1-1983 covers dimensions and gaging of pipe threads for general purpose. Have you called your threadolet supplier to ask how you specify the thread type you need? Do you need the NPT type?
  7. fwcatr

    Koso Hammel vs CCI vs Copes Vulcan

    The blanket statement that more stages produces less noise can be erroneous. If the stage actually takes a pressure drop, the statement is correct. If the stage does not take a pressure drop, the statement is erroneous. Even though a noise attenuation trim can have many, many stages, if...
  8. fwcatr

    Koso Hammel vs CCI vs Copes Vulcan

    Depending on the size of the valve, and what your research is intended for, you might want to think about verifying, by testing, the aero and/or hydro noise performance of the control valves along with veryifying the capacity characteristics. Each valve company may use the IEC method for...
  9. fwcatr

    Pulse Bruel

    I have been using B&K hardware and software for almost 8 years now. For all the various applications I have used it for, the system has been great. I have used the system in our lab and at many customer sites, the portability was one main reason why I bought it. The system can be very complex...
  10. fwcatr

    Acoustic Induced Vibration

    4Pipes, I have read through that paper a few times and I have some colleagues who have analyzed the results of that paper and expanded upon it and that subject matter. They wrote a paper on dynamic stress predictions of acoustic induced pipe vibration failures. The paper was presented in 2005...
  11. fwcatr

    STANDARD VS REGULAR PORT

    What zdas04 stated about the marketers is very true. Don't get caught up in the jargon used for valves, be sure to size the proper valve based on the pipe line dimensions, pressures, and flow rates you need. I checked the Apollo site, and the site does show dimensions for the ports if you...
  12. fwcatr

    Valve acoustic isolation

    Lhenrique, Could you please be more specific? Are you talking about laboratory conditions or field conditions? Are you talking about associated piping and valve? Regards, Fred
  13. fwcatr

    Getting rid of a link

    JEB66, I have had similar problems, and if I am understanding your situation properly, trying the following could help. One way to search for all external links is to go to Edit, Find, click on the options button, select within workbook, by rows, and look in formulas. In the find what space...
  14. fwcatr

    vibration/octave band center frequency

    Spike, The 12th octave bands comprising the x axis are in Hertz, or cycles per second. 1/12th octaves are usually used to get better definition of the vibration spectrum (better definition than 1/3 and 1/1 octaves) without using an FFT. If detailed FFT type frequency information is not...
  15. fwcatr

    ISA/IEC sizing question

    What I was trying to say before is that if you have an arbitrary inlet pressure and the xT, then you have xT=(P1-P2)/P1abs (since the xT is just a pressure drop ratio). You should then have your pressure drop where the valve becomes choked. As far as the equation goes, I wouldn't break up Y...
  16. fwcatr

    ISA/IEC sizing question

    If you have an inlet pressure and the xT value, you can calculate your downstream pressure and then the pressure drop.
  17. fwcatr

    ISA/IEC sizing question

    gsxra, If you assume the valve to be choked, start by using a Y of 0.667 and see where that gets you. If the valve is not choked, use a Y value between 0.667 and 0.93. If you want Y broken out, assume Fk=1 for air, Xt~0.5 to 0.75 for a globe valve, and the x/Xt factor to be the Xt value or...
  18. fwcatr

    Conversion confusion

    joebar32, Some time ago I came across two simple calculation programs on the internet that were free for the downloading. It is a good double check of your calculations type of thing from some reputable companies, plus it could be used to gain a better understanding of what you are asking...
  19. fwcatr

    Attenuation vs frequency

    Par1, In addition to what Greg Locock mentioned, I would start by testing each device by itself, if you can. Check the spectrums after you are done and see if you see anything that compares to the spectrums you have for testing with all devices present. If you cant find something there, test...
  20. fwcatr

    Need small cheap xducer

    AtResonance, I know that PCB makes transducers with a resonance freq of 1MHz. They are not quite near your $10 requirement, but if you call them and talk to them they might be able to help you out. I would also recommend doing a search using Google, you should be able to get many contacts...

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