material for underground oxygen piping
material for underground oxygen piping
(OP)
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.





RE: material for underground oxygen piping
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
RE: material for underground oxygen piping
RE: material for underground oxygen piping
Also not medical service I presume.
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
RE: material for underground oxygen piping
Isolation valves have monel trim. Above ground piping is monel after impingments with monel control valves.
RE: material for underground oxygen piping
RE: material for underground oxygen piping
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: material for underground oxygen piping
RE: material for underground oxygen piping
I suggest that you consider the US guidelines before the European equivalents.
The NFPA has a guideline (NFPA-50) that addresses industrial bulk oxygen systems.
http:
Underground piping, as I recall, is allowed, I suggest that you consider Sched 80, carbon steel (A106 -Grade B) with a robust coating.
Please let us know about your final design decision, particularly with regard to material selection and coatings
Regards
-MJC
RE: material for underground oxygen piping
Title 49--Transportation ... PART 192--TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS * That's the law * But you will find no difference between it and the quoted sections of the EU standard above.
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
RE: material for underground oxygen piping
Has anybody ever noticed that whenever "Big Inch" submits a response to a question, he gets either two or three stars (always the same number) to each and every response that he makes within that thread ?
How can that occur so consistantly..?
-MJC
RE: material for underground oxygen piping
It isn't a conspiricy it is the way that eng-tips.com works. The system doesn't keep up with which post got stars so it applies the stars to every post by the person in the thread.
It's just more noticible with BigInch because he gets so many stars (maybe there is a conspiricy.
BigInch,
Do you know what went wrong with your formatting above? The step to turn it off should have been "/color" not "/gray" as in This text should be red (gray doesn't show up on the grey posts)
David
RE: material for underground oxygen piping
I have a secret method for collecting
... practical answers.
... and I give a lot of stars, so maybe what goes around, comes around.
Yes zdas, thanks. I use formatted text on a semiregular basis, but sometimes I copy the leading attribute, get in a hurry, and then paste the same attribute for the trailing attribute forgetting to put the stroke before it.
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
RE: material for underground oxygen piping
RE: material for underground oxygen piping
You don't need a separate login ID to give yourself a star. If you really feel you need a star, just go back in a thread and click on the link. It's completely anonymous.
I don't think that's how most people get their stars though.
Patricia Lougheed
Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: material for underground oxygen piping
RE: material for underground oxygen piping
How do you do that? When I go back in any thread, my posts do not show a "Thank vpl for this valuable post".
Seagull,
Nor do I have another ID. Good idea though. But, what for? Stars don't get you anything other than stars. I've yet to make un centavo from any star collected, or for contacts made through Eng-tips either, for that matter.
The method is simple. Practical answers, like I gave in this one, a quote from the code, not a link to some publisher, an article resale house that will sell you one for $25 that you can find for free if you look hard, not to buy some code or a book, or a reference to a 25 year old magazine article that not even the poster has a copy of.
Just face it. I have a following!
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
RE: material for underground oxygen piping
There are specific recommendations for the isolation of UG O2 systems from other piping (and for damn good reason...)
http://boo
Karen.... I also strongly suggest the use of a Schedule 80 piping system
Regards
-MJC
RE: material for underground oxygen piping
See page 13...
h
-MJC
RE: material for underground oxygen piping
Great reference!
(See I gave you a star.)
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
RE: material for underground oxygen piping
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
RE: material for underground oxygen piping
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?
RE: material for underground oxygen piping
RE: material for underground oxygen piping
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.
RE: material for underground oxygen piping
RE: material for underground oxygen piping
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: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: material for underground oxygen piping
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.