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Pipe repair in service

Pipe repair in service

Pipe repair in service

(OP)
I need recommedations on repairing small pinhole leaks in large (30" to 60" dia.) piping.  Piping is transporting air (8 psig) for a sewage treatment plant aeration system.  Piping system cannot be opened for repair, but can be shut down for 1-3 hrs.  Piping is steel with Dresser couplings.  Thanks.

RE: Pipe repair in service

Is there any coating on it now?

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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: Pipe repair in service

Also, as you know of course, find our what is causing the "pinholes".

RE: Pipe repair in service

I think this type of repair system will more than adequate for your repairs base on your OP. I don't believe you need a fusion system. Metal clamps can get expensive very quickly.

Here a just a few of the many repair systems that will do your job. I didn't run down any specifics on any of the products. I've used the Dura Power Product and also one called Sealtight from Team Industries.

http://www.indumar.com/index.html

http://www.msvalves.com/prod04.htm

http://www.durapower.com/products.htm

You might want to look at Denso type products if external corrosion is the problem.

http://www.densona.com/Index.htm

RE: Pipe repair in service

clamp on a 60" would definitely set you back a few centavos.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: Pipe repair in service

(OP)
Thanks for all the great replies.  The piping is currently painted.  I think the corrosion comes from the fact that it is aeration piping for a sewage treatment plant and is probably seeing some corrosive fumes from the chemicals used or from the sewage.  I am not sure if the corrosion is inside or the exterior.  Maybe both.  
Now that I know some methods, I can write up a scope of work for it.

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