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Thanks, StoneCold. Its actually something a lot simpler - though your suggestion of an LEL seems good as well. The "instrument" they are talking about operates on the principle that the pressure of a steam/non-condensables mixture at a certain temperature indicates the percentage of...

Hi all, Reading about purging vessels with steam in the "Hazards of Steam" booklet by BP. They mention this instrument that apparently at one point was available by MSA and is no longer in production. Using it to measure air in steam at the discharge of the vessel during purging may indicate...

Hi all. Has anybody come across a list of states that issue discipline-specific PE licenses? Found this old thread on this same topic, but my issue was not quite addressed there: thread730-117475. Apologies if this has been discussed elsewhere.

Thanks Tmoose. Just trying to figure out how hot can a bearing get and how long it can run if it is not greased, or if the grease has lost its capacity to lubricate properly.

Hi All, Has anybody come across a book/reference where they discuss the rate of temperature increase observed when a bearing is run with little or no grease? I mean, is there a way to get a ballpark of how quickly the temperature increases if one knows the rpm, the loads, etc? Do you know of...

Hey all, I posted this over in the HVAC forum but got nothing. Do you know if there is a standard, recommended practice, or other accepted reference stating the the MEP of record should check for material incompatibility between piping and insulation? Specifically, closed cell rubber foam...

Hey all, Is there an ASHRAE standard or other document that warns the MEP of material incompatibility (some insulation materials have ammonia, which does not interact nicely with copper) between pipe and insulation? Thanks,

David, thanks for the reply. The flow path through a pressure regulator is designed to avoid (not prevent) choked flow within the regulator Do you know of any publicly available reference that states this? Maybe a manufacturer's catalog, or some instrumentation book? Thanks,

CJKruger, thanks for the reply. The pressure ratio certainly indicates that the flow is choked. However, there is an even larger pressure drop across the regulator (from 2kpsig to 150psig) which would indicate choking as well. In other words, I have a regulator in which the pressure drops...

Hello all, How do you explain that downstream from a regulator you have a pressure of several hundred psig and further downstream (some 200 ft) the pipe is discharging to the atmosphere, hence the pressure is 0 psig. Is there a normal shock standing at the pipe outlet to the atmosphere?