I need a brief discription of 3 methods of repairing a fractured main gas pipeline

What are the merits and drawbacks of each of these 3 methods.

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Clarification of Question by strongdave-ga on 17 Apr 2006 04:06 PDT

Hi redfoxjumps-ga

It doesn't matter, I don't want so specific information. I just need
to get a general idea about the available methods of repairing a
fractured 'MAIN' gas pipeline.

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Request for Question Clarification by redhoss-ga on 17 Apr 2006 07:49 PDT

I assume you are talking about a natural gas pipeline. Also, what is
the material (PVC, steel, etc.).

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Request for Question Clarification by pafalafa-ga on 17 Apr 2006 08:11 PDT

strongdave-ga,

There are only three types of pipeline repairs that I am aware of:

--welding, to close a cracked pipe

--adding a plate (on) or a sleeve (around) a pipe to repair a larger
rupture that cannot be readily welded shut

--replacing a section of pipe entirely


What additional details were you hoping to have by way of an answer?


pafalafa-ga

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Clarification of Question by strongdave-ga on 17 Apr 2006 11:41 PDT

pafalafa-ga 

I only need a simple explanation of the principles of each of the
first two methods.i.e. how would you carry it out? what are the
advantages and disadvantages of using this technique?

Thank you

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Request for Question Clarification by pafalafa-ga on 17 Apr 2006 11:57 PDT

strongdave-ga,

In addition to the techniques I mentioned -- which are all exterior
repairs -- it is also possible to repair a pipeline from the inside. 
Indeed, for pipelines that are hard to access (such as underwater
lines) internal repair may be the option of choice.

The main repair external and internal repair techniques are all
described and contrasted in this online presentation:


http://www.netl.doe.gov/technologies/oil-gas/publications/td/psr41633%20Kick-off%20Presentation.pdf
Internal Repair of Pipelines


Let me know if that has the information you need, and if not, what
else you would like to know.


paf

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Clarification of Question by strongdave-ga on 18 Apr 2006 05:31 PDT

pafalafa-ga 

Thanks for the document I find it very useful but I still need a more
detailed explanation of these techniques (not too much details).. I am
interested in a brief explanation of the principles of each technique,
advantages and disadvantages.

Do you know the pipe size? 

and pressure?

Residential or Business?