1930's pressure standard

[Pressed]

Hi

I would have put this in the History section but I think here is more appropriate! The thread link below is one where I answered another fellows question about the origination of the RPMs of a tractor PTO. Nobody continued the thread much and I am looking if anybody has more info.

Basically what I found was that to power extra equipment on a 1930's farm tractor they decided to use hydraulic power. To obtain this power they designed the PTO and attachable equipment to some pressure standard. I would like to know if anybody agrees with this and if they know what the pressure was? I would assume that this pressure standard hasn't changed much and is still valid today?

If you haven't figured it yet, I know little about fluid power, but I am curious about this subject.

http://www.eng-tips.com/viewthread.cfm?qid=134388

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http://www.tailofthedragon.com

 

[TBP]

I'd be interested in knowing if there's a pressure standard for hydraulics even now. As far as I can tell, the ASME pressure piping codes do not cover hydraulics, and never did. According to the info I can dig up, lube oil piping with a relief that lifts at anything over 100 PSI must meet pressure piping code standards, but it can sit beside hydraulic oil piping running at 2,000 PSI or more that doesn't fall under the code. What's up with that?

Most of my work is involves steam & compressed air, but I occasionally get asked about hydraulic piping. I have some reference books, but they're not "code" books.