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  1. ipocoyo

    Fluctuations in pressure gauge calibrations?

    Hi All, Sorry, I should have specified! The gauge itself is a room differential pressure gauge.The instrument itself has an accuracy of 0% at test points 0 and 30 Pa. However, it seems to be out of tolerance by 5Pa at its maximum pressure of 60 Pa. The differential room pressure never exceeds...
  2. ipocoyo

    Fluctuations in pressure gauge calibrations?

    Hello All, Another observation that I am rather curious about. Is there a reason why pressure gauges in particular tend to have fluctuated readings between calibrations? For example, the first calibration would have readings of 0,30, and 60 Pa. The next year it would be 0, 32, and 62 Pa. The...
  3. ipocoyo

    Is there an instrument can monitor volume of air?

    Hi Compositepro, I'm not too sure what you mean by counting the bubbles coming out of a tube. Is there a diagram to help me understand this? Also, I was thinking of using a rotameter instead, would this be more feasible? I have remade my initial experimental setup based on the recommendations...
  4. ipocoyo

    Is there an instrument can monitor volume of air?

    Hi Hacksaw, Would this not just detect the oxygen concentration in the water? What if I needed to measure the other composites of gases in the air such as nitrogen? Still an intern
  5. ipocoyo

    Is there an instrument can monitor volume of air?

    Hi itsmoked, I should have rephrased my initial question better. I am just curious to see how much of air is able to mix with the water. Would you suggest using a anemometer at the top of the vessel as the best option? Thanks again. Still an intern
  6. ipocoyo

    Is there an instrument can monitor volume of air?

    I am trying to measure the efficiency of a spray nozzle by measuring the amount of air that "mixes" with water as it passes through the nozzle. The experimental rig most likely will consist of an open port for free air to pass through. What would be the best way of monitoring the volume of air...
  7. ipocoyo

    Any tips in determining if there is flow though a pipe?

    Can anyone share any quick ways to determine if there is flow going through a pipe? Still an intern
  8. ipocoyo

    Typical operating pressure of a gas clinder?

    Hi sorry! Here are my calculations with units: (2x10^7Pa)(10.2m3)=n(8.314J⋅K−1⋅mol−1)(288K) n=85198 N=mass(g)/MR mass=85198(40) mass=3407906g or 3407.9 kg According to what is printed on the cylinder, it is 10.2m3. Still an intern
  9. ipocoyo

    Typical operating pressure of a gas clinder?

    We have a compressed gas cylinder containing Argon on site at the following specifications: Pressure = 20MPa Volume= 10.2 m3 Temperature= 288K I am trying to get the theoretical amount of Ar inside. I used the ideal gas law where PV=nRT but seem to be getting a result which does not look right...
  10. ipocoyo

    Typical operating pressure of a gas clinder?

    Thanks for the clarification, had a little brain fart moment there. Thanks all those who helped! Still an intern
  11. ipocoyo

    Typical operating pressure of a gas clinder?

    Hello All, If we know the volume and type of gas inside, are we not able to find the mass of gas by just using the density formula? From there, if we know the mass, temperature and volume can we not estimate the theoretical pressure using ideal gas law? Thanks! Still an intern
  12. ipocoyo

    Typical operating pressure of a gas clinder?

    Hello, Thanks for all the responses you have provided me! Upon checking the gas cylinders, here is what is stamped: C.P 20MPa T.P 30 MPa W.C 50.8L 60.2kg I have never seen the abbreviations C.P before, would anybody know what it stands for? Also, is it safe to assume that the weight of gas...
  13. ipocoyo

    Typical operating pressure of a gas clinder?

    Does anyone know how one can determine the pressure of gas inside a pressurised gas cylinder? We have a pressure regulator attached to a gas cylinder containing 9.5m3 of Nitrogen gas, with the inlet pressure showing around 140bar and the outlet at 5.5 bar. Is this possible? Still an intern
  14. ipocoyo

    What is meant by "Clean Bed" pressure drop?

    Hi All, I came across this term while looking at some documents pertaining to filters. It states: "The acceptance criteria of clean bed pressure drop is <70kPa" What is meant by this statement? Thanks! Still an intern
  15. ipocoyo

    Is a PSV required if there are no credible scenarios?

    Hi don1980, I want to point out from that clause that: "unless the equipment is intended to be protected by other protective devices within the assembly" Would the code be met if there is a PSV located directly 2-3 meters away on the same line from the inlet of the filter? Also, the receiver...
  16. ipocoyo

    Is a PSV required if there are no credible scenarios?

    Hi All, I just realised that in the specifications of this filter, it states that is complies with 2014/68/EU pressure vessels. How is this possible since in the EU PED is states that "for fluids of group 2(non hazardous), with a volume greater than 1 L and a product of PS and V is greater than...
  17. ipocoyo

    Is a PSV required if there are no credible scenarios?

    Hi avalveman, Thanks for the reply. If i use a conservative value of 0.045, would I still be required to calculate the required relief rate? Since 0.045>0.01 equation 12 should be used. However, i obtain the same scenario of a non-real result. Is it recommended to use equation 13 instead...
  18. ipocoyo

    Is a PSV required if there are no credible scenarios?

    Hi avalveman, Thank you for pointing out that mistake with the atmospheric pressure. How did you obtain the environmental factor F1 of 1.0? Did you mean 0.01 by any chance? Thanks! Still an intern
  19. ipocoyo

    Is a PSV required if there are no credible scenarios?

    Hi everyone, I am having trouble with sizing the PSVs. API 521 clause 4.4.13.2.3 provides a formula to find the estimate of the required effective discharge area in the event of external fire. However I get a non-real result because T1 is greater than Tw. Is Tw the maximum operating temperature...
  20. ipocoyo

    Is a PSV required if there are no credible scenarios?

    Hi everyone, Thanks for replying to my thread. I guess a PSV is always required to be attached on anything that's considered a pressure vessel. I will always size the PSV to a fire case scenario even though there is no definite identifiable source of fire. Thank you! Still an intern

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