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  • Users: iainuts
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  1. iainuts

    Potable water pipe connections

    I've volunteered to work on a small, water distribution project in the Dominican Republic which will benefit the local community. One of the first goals is to install roughly 3000 feet of 4" pipe from a well to an open tank. Maximum pressure expected is only about 70 psi. The pipe will be steel...
  2. iainuts

    Diaphragm compressor compression ratio?

    Any thoughts on what the maximum compression ratio should be for a diaphragm compressor (metal diaphragms)? Assume hydrogen gas. Alternatively, how many stages would be required to take gas from 100 psig to 6000 psig?
  3. iainuts

    Piston compressor in flammable service

    For a reciprocating gas compressor in flammable service, if a compressor manufacturer allowed piston ring blowby (leakage) to escape to atmosphere locally, would you consider this: 1) dumb thing to do 2) negligent 3) criminally negligent This case is not in courts nor is it likely to be so and...
  4. iainuts

    Rough size for hydrodynamic bearing.

    I need a very rough calculation for the size of a hydrodynamic bearing capable of supporting a load of 12,000 pounds, radially. Rotational speed is 700 - 750 RPM but I'd like to ensure this bearing is sufficiently large for rotational speeds down to ~ 400 RPM. Feel free to recommend oil type or...
  5. iainuts

    Internal pressure on a pole building

    Hi folks. I'm looking for qualitative answers on this one, nothing quantitative. This regards typical warehouse type buildings made of steel beams with sheet metal walls. Assume the building is uninsulated such as a metal pole building, roughly 30 feet high with a flat cement floor 40 x 60 feet...
  6. iainuts

    10,000 psi pipe, 8" OD, What spec?

    For service in the US, what pipe spec covers 10,000 psi, 8" OD pipe or tube? Also, what companies provide flanges, fittings, valves, etc... for this kind of high pressure, large diameter pipe?
  7. iainuts

    ASME Code RV's to 15,000 psi?

    Anyone know who makes ASME coded RV's that go to 15,000 psi?
  8. iainuts

    ASME Codes for Lifting of very small loads

    I design reciprocating compression equipment that is skidded, and a question has come up regarding overhead lifting devices supplied as an integral part of the skid. The skid is a welded steel frame with an overhead I-beam (aprox. 8 ft above grade) on which a chain fall is mounted to aid in the...
  9. iainuts

    Rotational inertia of 75 hp motor

    I'm looking for a quick and dirty number for the rotational inertia of a 75 hp, 460 V, 3 phase TEFC motor. Nothing super accurate, just a ballpark. Thanks in advance for the help. :)
  10. iainuts

    2 phase liquid/gasseous helium flowmeter

    Anyone ever heard of a flow meter that handles 2 phase liquid helium? (ie: liquid and gasseous helium)
  11. iainuts

    Dry piston ring material

    What would be your favored material for piston rings in a compressor (dry) going to 10,000 psi or more? Gas is hydrogen.
  12. iainuts

    Fatigue strength of 304, cold worked versus annealed

    This web page: http://www.hghouston.com/ss_cwp.html states: The web page also shows that fatigue strength can be improved dramatically by cold working. Endurance limit is listed as: 304 annealed = 35 ksi 304 3/4 hard = 92 ksi I'm in the process of designing something that will be subject...
  13. iainuts

    Low power factor, recip pump

    I have a recip pump and the motor seems to have an exceedingly low power factor of roughly 0.24. Here's the details: Motor: 100 hp TEFC, 3 ph, 460 V, 1750 RPM Pump: Recip, 356 RPM Belt drive Motor is way oversized, power necessary is only about 40 hp. The recip has a small flywheel but not...
  14. iainuts

    Differences: B31.3 versus B31.12

    Last year (2008), ASME B31.12 "Hydrogen Piping and Pipelines" was released. Prior to this pipe spec, ASME B31.3 was generally the go-by for hydrogen piping systems in the US. The purpose of this thread is to identify differences between B31.3 and B31.12 to help bring folks like myself up to...
  15. iainuts

    Codes for lifting eyes

    Is there an ASME code (or other US code) which covers requirements for lifting eyes? In particular, I need to put a couple of lifting eyes on a machine and would like to see what specific requirements there are for determining suitable lifting eyes.
  16. iainuts

    Microbes in Stagnant Water Heat Exchanger

    I have a large, water filled vessel with a tube bundle used for heating the gas going through the bundle. Water is electrically heated and the vessel is insulated. Process materials are all 300 stainless steel. Vessel is carbon steel, not pressurized. Vessel is outdoors in Vermont and the...
  17. iainuts

    Need aluminum pipe fittings, sched 10

    I'm in a bit of a bind. I need a bunch of pipe fittings and I'm having no luck. Any thoughts? 1. 6" Sched 10 Tee, aluminum Qt: 17 2. 6" Sched 10 short radius elbow, aluminum Qt: 17 3. 8" to 6" Sched 10 concentric reducer, aluminum Qt: 17 Any kind of aluminum is good. All the leads I've...
  18. iainuts

    Flexible Metal Hose

    I'm looking for an extremely flexible, 8" metal hose, stainless steel. I've tried the conventional convoluted metal hoses, but they just aren't flexible enough. I believe there are some manufacturers that make the convoluted hose from layers instead of just a single ply of metal. Can't seem...
  19. iainuts

    Pressure drop through strainers

    I need a conical strainer (wire mesh cloth possibly reinforced using perforated metal sheet) installed in a line between flanges. The strainer manufacturers I've talked to don't seem have a decent method of determining pressure drop. Things that are known about the filter material are open...
  20. iainuts

    Materials resistant to Hydrogen Embrittlement

    I'm looking for high strength stainless steels resistant to hydrogen embrittlement. I realize the 300 series are resistant and probably Nitronic 60, but I'm having other issues with those materials. What I really need is a good list of materials that provides their susceptibility to hydrogen...

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