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material for underground oxygen piping 7

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karen53

karen53

Mechanical
Jun 12, 2008
7
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.
 
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Is this a medical oxygen system? If not, maybe this helps.

(INDUSTRIAL) OXYGEN PIPELINE SYSTEMS
IGC Doc 13/02/E
GLOBALLY HARMONISED DOCUMENT
Replaces Doc 13/82
EUROPEAN INDUSTRIAL GASES ASSOCIATION

4.5.1 Underground piping systems
Piping should be of all welded construction in accordance with a specification and inspection code
such as API 1104 (Appendix G, reference 6.5) or any other recognized code. Underground piping
must be externally coated to an approved specification, to protect against soil corrosion. Reference to
current, internationally accepted, coatings standards and specifications is recommended (see
Appendix G, references 6.17 to 6.20)
Underground piping should be adequately buried to protect it from frost, casual surface construction,
shifting due to unstable soil, back fill damage to the external surface of pipe or the coating, and
aboveground loads such as vehicles or equipment moving over the path of the pipeline. Pipe casings
or load shields, if required by special agencies, should be installed at railroad or road crossings or
where unusual aboveground loading can occur. Casings or sleeves require careful consideration and
special measures to avoid cathodic protection problems and arcing, which can be caused due to an
electrical connection forming between the sleeve and carrier pipe due to settlement, etc. In general
the use of metallic casings or sleeves is to be avoided wherever possible.
Underground oxygen piping is particularly vulnerable to damage by lightning strikes or ground fault
conditions, which may ignite the pipe material. Electrical continuity between underground oxygen
piping and above ground piping, or other metal structures, should be avoided if possible. Due to the
possibility of leaks and risk of enriched atmosphere it is preferable to have no flanged joints
underground either buried or in pits.
Click to expand...


"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
 
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lets see, there are 100's of miles of buried O2 lines along the gulf coast and they are all carbon steel coated and under CP.
 
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ASTM A 106-B Pipe is common for OSBL. Search the web for AIGA 005/04, 012/04; EIGA 13/02/E, 33/97/E, 15/00/E and a training powerpoint package EIGA 12/05. Read them.

Isolation valves have monel trim. Above ground piping is monel after impingments with monel control valves.
 
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carbon stee, coated and under CP. The lines are industrial O2 and I believe there are customers that make medical grade out of it too.
 
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Yes, the coating is required. If you do go with stainless steel, the decision to apply CP should be made by a competent CP professional after a study of the coating type, risk of interference, and other normal CP considerations.

Steve Jones
Materials & Corrosion Engineer
 
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Not medical. It is used for a pulse detonation boiler cleaning system.
 
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karen....

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.


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
 
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We don't really know where Karen's system is located.[gray] But if it is in the US, you probably have to look at this one.

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.


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

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

 
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MJCronin,
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
 
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The system keeps up with the star count for everybody. Check your user profile or the profiles of any member and it shows how many stars you've reveived, given and for which catagory too.

I have a secret method for collecting
03-0827028284M.gif

... 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.


"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
 
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Perhaps I should setup multiple logon ID's so that I can give myself stars too.
happy.gif
 
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JL Seagull

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 for tips on how to make the best use of the Eng-Tips Forums.
 
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So, stars aside, I think I will be going with A106 coated with fusion bonded epoxy. This pipe will still need to be oxygen cleaned and I am talking to vendors regarding this. Thanks for all of your help.
 
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vpl,

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! [rockband]



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