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O2 Piping. Selecting the correct Metal.

O2 Piping. Selecting the correct Metal.

O2 Piping. Selecting the correct Metal.

(OP)
Hello,
I am working on a skid that has multiple gas systems on it. One of the systems is an O2 system. The operating pressure will be around 400 psi. The O2 flow will be monitored by a Vortex meter. I am looking for a Standard that will give me Velocity Limitations for Impingement, based on metal types. Does anyone have a recommendation?

Regards,

RE: O2 Piping. Selecting the correct Metal.

If the oxygen is dry and contains no particles, the limiting factors are more likely to be noise and vibration.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: O2 Piping. Selecting the correct Metal.

I don't think the gas makes much of a difference.

I wouldn't aim to exceed 30m/sec for dry clean gas.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: O2 Piping. Selecting the correct Metal.

It is best to lower velocities within O2 pipes, as particulate matter may be brought to combustion temperatures by impact against the pipe walls.

RE: O2 Piping. Selecting the correct Metal.

The Compressed Gas Assocation (CGA) has the document you want.

RE: O2 Piping. Selecting the correct Metal.

There are also a few NASA reports/handbooks/documents on the design of oxygen systems. Note that the 2nd link below is a cancelled safety document that is oft cited by manufacturers of oxygen equipment.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.g...
http://www.hq.nasa.gov/office/codeq/doctree/cancel...

Swagelok has a pretty good brief on the subject, and contains a plethora of references that you might find useful.

http://www.swagelok.com/downloads/webcatalogs/EN/M...

RE: O2 Piping. Selecting the correct Metal.

There is guidance in some previous discussion on this topic on this website also - Google brings it up.

RE: O2 Piping. Selecting the correct Metal.

The scary thing about oxygen is that from its standpoint, literally everything else is fuel, so the standards for oxygen piping systems construction, operation and cleanliness are different.

... so different that it might be economical to break out the oxygen system to its own skid, and engage people with the necessary special skills and equipment to build that skid.

Mike Halloran
Pembroke Pines, FL, USA

RE: O2 Piping. Selecting the correct Metal.

ASTM G88 alludes to a 45 metres per second threshold velocity for particle ignition (at least my 2005 version does).

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: O2 Piping. Selecting the correct Metal.

400 psig oxygen is no reason to panic. Follow the CGA design guidance and ensure the parts and finished lines are cleaned for oxygen service. No problem.

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