Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi Shvet, I feel all the equations we have been talking about are very much required for the compressible flow calculations without understanding them would make no sense to do the calculations. Using software(s) would also require understanding of the equations used by it. It is my good...
  2. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    W=268505 lb/hr, Rated Capacity if the PSV after reducing the capacity due to inlet pressure drop effect. k=1.4 T=552 Deg R (Temperature at PSV Inlet) M=32, Molar Mass of O2 gas A=63.68 in^2=(PI()/4)*(7.98^2) , 8" Sch 40 pipe flow area. PSV is 6"Q8". P=25 psig, Back Pressure at PSV outlet flange...
  3. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi Snickster, Thank you very much for sharing me your priceless insights into how the Reaction Force is derived. In understood how you derived the Reaction Force formula. Now I want to calculate the Reaction Force at the PSV outlet flange. The momentum force is same at the PSV Exit flange. For...
  4. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi Snickster, The formula that you wrote for the Acoustic velocity calculation is assuming that the temperature at the pipe exit is calculated using T*=To * (2/k+1). But this is based on the assumption that flow is isentropic that is adiabatic and frictionless. The flow is in the pipe is...
  5. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi Snickster, Thank you very much for the invaluable guidance given to me. Your explanation is detailed and clear to me. Knowing the Pressure of 6.8 psig at the pipe exit, can I use the adiabatic compressible flow equation to calculate the pressure at the PSV exit?. Thanks and Regards, Pavan Kumar
  6. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi Snickster, Thank you very much for taking time to review my calculations. Yes I am indeed not very clear on Compressible Flow especially when the flow reaches sonic velocity. I think I get full understanding of this I will use AFT Arrow for my calculations. I will read the article that you...
  7. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi Snickster, Due to changes in the PSV location I updated my PSV Sizing, PSV Inlet/Outlet Line Pressure Drop calculations and took care of your comments above. Kindy find the udpated file attached. Please let me know if you still see any mistakes. The new location is show below. Thanks and...
  8. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Thanks George. Pavan Kumar
  9. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Please check attached.
  10. Pavan Kumar

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Hi All, I sized a PSV downstream of a Control Valve for its wide-open failure case and got a 6"Q8" PSV. The required relief rate is 254107 lb/hr with Oxygen as the fluid. The rated capacity of the PSV is 294,851 lb/hr with 10% overpressure. I tried to size the inlet/outlet lines to this PSV...
  11. Pavan Kumar

    Flame Arrestors on Natural Gas and Oxygen Vent Lines

    Agree. It makes sense to me. Pavan
  12. Pavan Kumar

    Flame Arrestors on Natural Gas and Oxygen Vent Lines

    Hi George, It is said that Oxygen can heat up the piping due to high velocity and can cause the metal to burn. Particle impingement can cause this heating as well. I recently received training to this effect. Thanks and Regards, Pavan Kumar
  13. Pavan Kumar

    Flame Arrestors on Natural Gas and Oxygen Vent Lines

    Hi All, I have been tasked to size and specify End of the Line Flame Arrestors (FAs) to be installed on the vent line for Natural Gas and Oxygen pipe lines. The idea is to prevent an external flame from propagating into the Pipe line when it is purged with N2 gas. The purge gas is vented to the...
  14. Pavan Kumar

    Steam Vent Control Valve - Reaction Force Calculation

    Hi Snickster, I thank you very much for providing me a direction for the calculations. I will do these calculations and get back to you with results. The momentum force should use the actual velocity not sonic velocity correct?. Can this be done? Thank You. Pavan Kumar
  15. Pavan Kumar

    Steam Vent Control Valve - Reaction Force Calculation

    Hi LI, The silencer is to provided immediately downstream of the Control valve vendor, please see snapshot below for my model. The supports are being designed based on pipe stress calculations based on my input on the reaction force. Thanks and Regards, Pavan Kumar
  16. Pavan Kumar

    Steam Vent Control Valve - Reaction Force Calculation

    Hi Goutam, Apologize for the delay in getting back to you. Here are my responses. 1. It is open discharge with a vent pipe is located on a standard drip pan elbow arrangement. 2. The pressure drop in the silencer plates is 7.12 bar and I have assumed 0.5 bar for the piping. So it totals to...
  17. Pavan Kumar

    Steam Vent Control Valve - Reaction Force Calculation

    Hi All, I want to calculate the reaction force at the elbow exit(F1) and vent pipe exit(F3) for a Steam Vent Control Valve that has been sized to vent excess steam pressure. It has been sized to vent the full boiler load as the worst-case. At this flow (47000 kk/hr), the pressure upstream of...
  18. Pavan Kumar

    Allowable Overpressure for Electric Steam Boilers per ISO-4126

    Thank You. AFAIK the % back pressure ( superimposed + built-up ) is equal to the % overpressure.
  19. Pavan Kumar

    Allowable Overpressure for Electric Steam Boilers per ISO-4126

    Thank you very much Obturator. I will use 10% overpressure and refer to the EN12953-6 and 8 as you mentioned above. Also 10% overpressure means 10% back pressure is allowed correct?. Thank you very much again. Thanks and Regards, Pavan Kumar
  20. Pavan Kumar

    Allowable Overpressure for Electric Steam Boilers per ISO-4126

    ARMATUREN ARI-SAFE 25912

Part and Inventory Search

Back
Top