High Pressure Fitting Help

[ozzkoz]

Hi,

I am pretty new to tube fittings (and hydraulics in general). We have this box of high pressure tube fittings for a high pressure pump and I need to use them to interface into a piece of hardware I am designing. The fitting has a 9/16 threaded coupling and the tube has a conical shape to it. It appears to be some kind of metal to metal seal. I've been told they are standard but I can't find a governing spec anywhere which I can use to design the interface on my part.

Does anyone know if there is a MS, or SAE specification which governs these type of 60,000 psi fittings?

Thanks

 

[rneill]

Are there any markings on the fittings. Normally fittings like this have some sort of manufacturers markings and rating information. Can you upload a picture ?

 

[rneill]

Any chance it might be something like these fittings from Autoclave Engineers - I know their stuff is typically 9/16"

http://www.autoclave.com/

 

[ozzkoz]

Yes it is very much like those, I think this is exactly what I need. Thanks a ton.

 

[unclesyd]

A posted picture would be of a great help as there are myriad of fittings for high pressure out there.
As stated above a lot are 9/16" with the majority of the high pressure 60,000 psi range use coned and threaded tubing. This is where the tubing is threaded and ferrel is screwed onto the threaded section and then seated with the nut.

The Butech Catalogue is essentially the same as the Autoclave one.


My rant:
It appears from you post that your are new to world of high pressure. I personally think you should get a little better background in application and use of high pressure fluids. High pressure fluids are nothing for the under trained work around.
The handling of HP fluids is filled with danger at every turn and at your stated pressures there is one insidious one called hydraulic fluid embolism. Though it can happen at much lower pressure it is instantaneous at your pressure. First off it can kill but more often it just cripples a person by the lost or loss of use of an appendage. The problem is caused by injection of HP fluid into the body usually the arm, hand, or leg. The fluid will either cut off an appendage or inject the fluid under the skin say from the hand to shoulder area. In this case the arm is wasted and just to keep it requires constant medical attention with the accompanying pain for months.

here is a very good old paper and a very long download paper on UHP. A lot of the work here has been superseded but it is still a good starting point. I had to take a week long course when I started work, part of which used this paper

http://www.butech-valve.com/corp/details/0,10294,CLI1_DIV139_ETI9830,00.html

 

[moltenmetal]

You have a steep educational curve ahead of you if this is the first time you've used "cone and thread" tubing...good luck to you. Do your homework and be safe!

 

[ozzkoz]

This is just a piece of test equipment which will safely be contained. We really don't do too much at this high of pressure, we typically stick with lower pressure AN type fittings.

 

[moltenmetal]

If you don't actually need the pressure and thermal cycling and vibration resistance of cone and thread, buy adapters to get yourself back to ordinary OD compression fittings as fast as you can. Otherwise, expect a major fitting hassle every time you need to make a change to the system.

If you DO need the above-mentioned properties, then I'd suggest getting some help. Autoclave Engineers, Butech or Swagelok (if the pressure isn't TOO high) might be sufficiently helpful to get you what you need, but it could still be a steep learning curve for you to climb before you're done.

 

[racookpe1978]

"Just" a high pressure system ain't the way to think about anything that can kill/main/cut off your hand in an unguarded instant. Especially when you "think" you have it "safely" isolated.

Please - Take your pressures, yourself, and your fellow employees very, very seriously.