material for underground oxygen piping 7

[karen53]

Need to install a 2" underground oxygen pipeline. Pressure is 125 psi. The aboveground piping is SS304. Consulting engineer is recommending SS316 with an external coating. Is the coating required? Is cathodic protection required? If anyone has experience with a similar installation, advice would be appreciated. A review of CGA 4.5.1 was inconclusive.

 

[BigInch]

NOW.... you got more than me.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[karen53]

MJ

Thank you for the reference. This is essentially the verbiage in the CGA code that sparked my initial question. I have found an in house expert that can do CP design and I have also found a suitable coating. It appears that carbon steel pipe (schedule 80) will be suitable because my velocity is low enough that I don't have to worry about ADBRE. So now I need to find a vendor that supplies carbon steel pipe - oxygen cleaned and coated. Any ideas?

 

[karen53]

Anyone ever used copper for this application. It appears to be readily available.

 

[KiwiMace]

But McBean was quite wrong. I'm quite happy to say
That the Sneetches got really quite smart on that day,
The day they decided that Sneetches are Sneetches
And no kind of Sneetch is the best on the beaches.
That day, all the Sneetches forgot about stars
And whether they had one, or not, upon thars.


Courtesy of Dr Seuss.
Who had a quote for every occasion.

 

[karen53]

You people don't have enough work to do.

 

[vpl]

Karen

Returning to your questions (and thanks for trying to keep us on track)

While copper may be readily available, it is also rather expensive. Copper wire has been known to "walk" offsite with some frequency and there have even been thieves who have electrocuted themselves trying to steal energized copper wire. This could cause you a number of problems in trying to maintain your pipeline.

Additionally, given its excellent electrical conductivity (which is why it is used for wiring), I don't think it would be a good choice for carrying oxygen.







Patricia Lougheed

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

 

[karen53]

Thanks, vpl.

My oxygen supplier uses copper encased in a PVC jacket with foam insulation blown in for all buried lines. Expensive, but I know it will work. Copper is actually the first choice in oxygen piping because it has no carbon and therefore adiabatic heat of recompression is not a concern.

As to theft, this is private property and quite secured so it is not a concern.