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  1. DesmoFan

    16.34 Compliant Valve Min Temp vs B31.3 Material Min Temp

    A manufacturer claims their valve is ASME B16.34 compliant. The material, A351 Gr CF8M, pressure and temp rating listed in B16.34 2004, Mand Appd. VII only goes as low as -20F. B31.3 Table A-1 min temp for the material is -425 F. In paragraph 2.3.2, B16.34 it states the pressure rating at...
  2. DesmoFan

    Pipe schedule/type

    Thanks to all that have responded, I decided to measure the other pipes and in doing so discovered the tape measure I grabbed out of the shop had the beginning shortened. I got another tape and the diameters match current piping specs (16" measures 15.98") so the only mystery that remains is...
  3. DesmoFan

    Pipe schedule/type

    I am in the planning stage to replace part of an underground water system that operates at 180 psia. The drawings of the system are dated from late 1950s. The drawing indicates one of the pipes is 16" CW-175, and that it is cement-mortar lined. I measured the outside diameter of the pipe...
  4. DesmoFan

    Ball Valve Seat Damage

    Thanks tr1ntx, yes the vent system is restrictive
  5. DesmoFan

    Ball Valve Seat Damage

    The valves are commanded closed and then when we want water we just vent the "muscle" air to the actuator and let the actuator springs open the valve but it takes a while to get about 10-12 seconds to full open
  6. DesmoFan

    Ball Valve Seat Damage

    No throttling but the cycle time is over 10 seconds, not 1 second. Thanks
  7. DesmoFan

    Ball Valve Seat Damage

    Thanks to everyone for the valuable input, we do use these for open/close service but the closing/opening time is fairly long, about 12 seconds. With our current pnuematic setup we can't currently improve that. I was thinking of replacing the ball valves with butterflys. Thoughts?
  8. DesmoFan

    Ball Valve Seat Damage

    These valves are not used very often maybe once every 3 months for less than a minute. Yes the seat is bent inward.
  9. DesmoFan

    Ball Valve Seat Damage

    The valve is a Valworx 521124 Pipe Size: 3" NPT female Port Size: Full Port, Orifice 3.00 inches, Cv 873 Working Pressure: 300 PSI WOG Working Temperature: 0-180ºF (0-300ºF with optional valve mounting kit) Valve Body: Brass Ball: Chrome plated brass ball Stem Seals: PTFE (Teflon) with double...
  10. DesmoFan

    Ball Valve Seat Damage

    I have a water system with a large manifold feeding 10 3 inch pipes. Each pipe off the header has one 3" ball valve, about 1 ft of pipe and a nozzle. During normal operation we bleed water through the valves and nozzles and then close the valves. The system is pressurized to 180 psig and when...
  11. DesmoFan

    Filling a high pressure bottle

    I drew out the system again today and understand what you are saying about the source gas enthalpy not being constant due to the resistance of the bottle changing as it fills. I will add this into the spreadsheet. I originally started using ideal gas but gamma for helium is around 1.7 at -290...
  12. DesmoFan

    Filling a high pressure bottle

    The source gas configuration is unkown at this point. I assumed that the enthalpy of the gas coming into the bottle would be constant to simplify the problem. Maybe this is a bad assumption. Sorry if I seem a little confused,my background is hydraulics so I am clearing the cobwebs on this...
  13. DesmoFan

    Filling a high pressure bottle

    Thank you both for the input, iainuts you are correct this is for a rocket application, the temp of the GHe is coming in -290F and the final pressure will be around 3200 psi. I do have a spreadsheet that I have been working on which is uses some gas property routines (GASP) and I am in the...
  14. DesmoFan

    Filling a high pressure bottle

    I need to fill a bottle submerged in LH2 with 800lbm of -290F GHe in about 30 minutes. My bottle temp limit is somewhere around 130F. I have tried to model the problem with adiabatic compression and isothermal. The adiabatic heats the gas in the bottle too quickly and the isothermal of...

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