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...
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?
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...
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...
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...
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?
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...
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. :)
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...
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...
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...
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.
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...
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...
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...
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...
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...
