O2 Pipeline Velocity
O2 Pipeline Velocity
(OP)
Hi guys,
I'm working on sizing an O2 pipe of about 300m. I was looking through the CGA standards and it suggests a limit of 30m/s for the pipe velocity due to impingement, but then later states that impingement is not an issue with high purity oxygen, or with long radius elbows, both of which apply to us. I still feel like I should be using this 30 m/s limit as my maximum for safetys sake, but any advice would be greatly appreciated.
Regards,
Brian, E.I.T
I'm working on sizing an O2 pipe of about 300m. I was looking through the CGA standards and it suggests a limit of 30m/s for the pipe velocity due to impingement, but then later states that impingement is not an issue with high purity oxygen, or with long radius elbows, both of which apply to us. I still feel like I should be using this 30 m/s limit as my maximum for safetys sake, but any advice would be greatly appreciated.
Regards,
Brian, E.I.T





RE: O2 Pipeline Velocity
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
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RE: O2 Pipeline Velocity
You might also check other standards such as NFPA Fire Protection Handbook Chapter 9, ASTM G88 and other G series standards.
RE: O2 Pipeline Velocity
Thanks JL, I'll take a look over those. Its about a 1000ft pipe, low pressure (1 barg) with a couple of check and isolation valves, which would be potential impingement sites, so I think I am doing this right in keeping the velocity below 30m/s.
RE: O2 Pipeline Velocity
The impingement refers, for example, to (carbon steel) rust particles picked up in the gas flow, or to the heat developed by a sudden closure of valves.
From an article by "Air Products" one can learn that reduced gas velocities are safer in the sense that lower impact energies reduce the chances of an ignition of elastomers in valves and regulator seats, or of some hydrocarbon remnants left over after air blowing the "new" already degreased pipe with not-so-pure shop air rather than with clean, dry nitrogen.
RE: O2 Pipeline Velocity
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
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RE: O2 Pipeline Velocity
My understanding was that the impingement was not just impact, but also, slag or scale skidding done the inside wall of the pipe.
I think it's best to play it safe.
NozzleTwister
Houston, Texas
RE: O2 Pipeline Velocity
How hot do we have to get a bit of iron in a pure O2 atmos to ignite?
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RE: O2 Pipeline Velocity
It all depends on the capacity you require.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: O2 Pipeline Velocity
http://sm
I2I
RE: O2 Pipeline Velocity
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I2I
RE: O2 Pipeline Velocity
BigInch, the Air Products' article appears on Google asking for Safetygram #33.
RE: O2 Pipeline Velocity
Brian, Mechanical E.I.T
RE: O2 Pipeline Velocity
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com