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  • Users: skuntz
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  1. skuntz

    Ultrasonic flow meter speed of sound in various gases.

    I am attempting to explain to my boss the dependency of gas composition to the transit time in ultrasonic meters. I am getting conflicting information of the dependency of the speed of sound in a gas with molecular weight. Some (reputable?) web sites show an equation with dependency on...
  2. skuntz

    Maintain backpressure into a vessel by submerging the outlet?

    We are flowing water into a basin that is 150 psig upstream. The outlet is above the basin. The design now is to use a restriction orifice to create enough backpressure to prevent flashing & cavitation. The new idea is to submerge the outlet deep enough into the basin such that the pressure at...
  3. skuntz

    Straight run requirements for a restriction orifice?

    We are installing an RO to let down the pressure downstream of a control valve. Since we are only taking a pressure drop and not taking flow measurements, is it necessary to have straight run requirements?
  4. skuntz

    Meaning of "high high" alarm

    How does a "high high" alarm differ from a "high" alarm?
  5. skuntz

    Downstream consequences of flashing through a globe valve

    I have a situation where where water will flash through a globe valve to an an open basin downstream. There will be some piping downstream of the valve before emptying into the basin. What (if any) are the issues I need to consider with regards to the downstream piping arrangement?
  6. skuntz

    speed of a pressure fluctuation in a flowing fluid

    This is related to a real world design issue. If you have a process where the pressure of a compressible fluid is being measured downstream and a sudden change in pressure occurs (e.g. step change), how do you determine the time of propagation between the the point of change and the point of...
  7. skuntz

    Response time of a series of multiple signal devices

    I have a process variable input consisting on a pressure transmitter followed in series by two signal conditioners. I am given the response time of the transmitter and the corner frequencies of the signal conditioners (acting essentially as low pass filters). I guess that for each signal...
  8. skuntz

    Effect of a low pass filter on the response of a PID controller

    In general terms, could someone please explain the effect that a low pass filter on the input of a PID controller would have on the response of the system? The controller will compare the process variable against a setpoint, but for reasons I'll not get into here, the process variable first...
  9. skuntz

    Two Phase Flow in a meter run

    We are measuring Natural Gas Flow using a meter run where where we are expecting 99.84% vapor mass fraction and the remainder is NG liquids (P = 1100 psig). Yes the vapor fraction is very high, but it is still two phase flow. Will the flow calculations for pure vapor still apply? Any other...
  10. skuntz

    Compressor sizing for instrument air

    I am looking for some "rules of thumb" for sizing an air compressor that will service several valves (control & shutdown). Obviously we could go into a detailed analysis of actuator sizing, air consumption, cycle time, etc. But this is an estimate. We have estimates of the number of valves &...
  11. skuntz

    Fisher Regulator Sizing

    I am sizing a Fisher regulator for air and I have calculated the Cv required . The product data sheet(s) however give me "wide open flow" and C1. I understand the definition of C1 but but how does this relate to my calculation? Is my criteria that I nedd to be below the wide open flow...
  12. skuntz

    Regulator sizing coefficients

    What is the difference between the Cv and Cg (gas sizing coefficient) for a regulator? It seems like sizing regulators differs from sizing control valves in this respect.
  13. skuntz

    Sizing a regulator

    I am sizing regulators (Fisher, specifically) Their technical bulletins give guidance such as IEC constants for sizing just as you would any other valve, but they also provide data for calculating "wide open flow for relief valve calculations". I do not know what this means. Is this the...
  14. skuntz

    ANSI face to face dimensions

    Where can I download a table of ANSI face to face dimensions of flanged valves for CL300, CL600, & CL900?
  15. skuntz

    What are pipe "loops"?

    While looking at photographs of a chemical plant, I had noticed that in several places the piping takes a right angle jog, turns back to the original direction, then takes two more turns to be back in line with the pipe. On the photos these were referred to as "loops." What is the purpose? It...
  16. skuntz

    Crimping Stainless Steel

    I am contemplating a fixture that uses an aluminum strip to crimp a stainless steel wire. Would there be an issue with using two different metals?
  17. skuntz

    Ultrasonic atomization/evaporation

    We are investigating the use of ultrasonic techniques to achieve atomization/evaporation of Hydrogen Peroxide in aqueous solution. Anyone have experience in this technique or that can recommend where to start?
  18. skuntz

    Ultrasonic atomization/evaporation

    We are investigating the use of ultrasonic to vaporize an aqueous solution of Hydrogen Peroxide. Anyone out there that has seen this done for any substances? We would like to understand the process better.
  19. skuntz

    Transient analysis of heat exchange

    I am looking for resources to help me to determine the time to heat up air circulating in a closed loop by passing it through a fin & tube exchanger where the heating medium is a glycol loop that is picking up waste heat from a generator. Both the air and glycol start out at the same...
  20. skuntz

    Manifold Design Guidelines

    I am looking for all the resources I can gather on how to design a manifold that will evenly distribute flow (air in my case but for any fluid in general) from a header pipe to several branch lines. Perry's devotes about 2 pages to the design of a perforated distributor. It's useful...

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