Pipe repair in service 1

[trashcanman]

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.

 

[BigInch]

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/

 

[Zapster]

Have some repair clamps made if there is room. No need to take the lines out of service. One company that does this type of work is:

http://www.furmanite.com/Home/tabid/36/Default.aspx

 

[RWF7437]

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

 

[SJones]

http://www.hse.gov.uk/research/otohtm/2001/oto01038.htm

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[unclesyd]

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

 

[BigInch]

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/

 

[trashcanman]

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.