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abeltio, I did not think of using the pressure ratings of the flanges to determine the pressure rating of the heat exchanger...how incredibly practical! Though we are in the middle of this rebuild, it is not the critcal path of the larger project, and we await parts anyway. I'll get on this...

RMW, Thanks for such a fast response. This testing is a maintenance function, so we are seeking reliability. Given that, your suggestion that we test to 1.5 times the design pressure seems the way to go. However, this is a proprietary part and I do not know the design pressure. The...

I wish to pressure test 2 heat exchangers (that have been in service for many years) to justify their suitability for continued service, and to avoid replacing them. These are simply tubes attached to a flange that inserts into the oil sump of a machine, and plant water passes through the tubes...

So do attorneys an even nurses. Most (maybe all) of these PDH requirements are determined by state boards, not national boards. While the concept of PDHs is good, it has created a whole industry of suppliers, and much of it is a racket. Folks who lead a normal regimented life don't...

Ok, I'll weigh in because I find the question interesting, and I wish to understand the concept. But I am a plant engineer, not a design engineer, so my thought process below is qualitative, not quantitative. I think the natural frequency might be affected in 2 ways. First, if the transverse...

Renee04, Thanks...I can work with that.

Cool suggestion.

Thank you, Tygerdawg. I found it just like you said. http://www.electromate.com/technicalsupport/smartmotioncheatsheet.pdf

This sounds to me like a really tough application for a shear pin coupling given the stops and starts, running in both directions, and corrosion. Reliability will be horrible. Have you considered an electrical overload device? Personally, I'd have to consult one of my EE buddies, but this...

Renee04, I provide my engineering services to factories that are anywhere but home, so with all my spontaneous travel (I'm not working if I am not traveling) it is difficult for me to schedule classes for PDHs. So your comment about free seminars at the university intrigues me since I also live...

I agree with Moltenmetal. Engineers are a very diverse lot, as are the careers that are open to them. I am certain that you can find the excitement that you seek, though it may not be in the places where you are looking. Have you considered working in a plant or factory? How about for a firm...