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| | | Junior Member
 
Group: Forum Members
Last Login: 3/17/2008 3:15:33 PM
Posts: 13, Visits: 158 |
| | We have an 18-inch aeration air header pipe that leaks. The header pipes comes off of the blowers and then goes through the floor of the slab on grade blower building. It is buried below the building and in the road next to the building. We can feel air leaking around a blower pad in the building and in cracks in the road outside the building. Our best guess is that the air is leaking at the mechanical joints at the bend below the floor and at a pipe joint or two after the building. The pipe is at ~ 9 psig and blower discharge temps get up to 210oF. Since getting at the joint below the floor will be a big headache, we were wondering if any facility has has repaired a similar problem with some type of internally applied coating that could withstand the temp or in another way that might fix this problem without tearing up the floor. Any thoughts or info from similar experience would be greatly appreciated. |
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| | | Supreme Being
Group: Forum Members
Last Login: 2 days ago @ 1:37:32 PM
Posts: 481, Visits: 1,437 |
| | Can you tap in another pipe above ground? if not, take the headache, and replace it. You will be glad you did. Ask some contractors to bid on it. |
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| | | Forum Newbie
Group: Forum Members
Last Login: 3/28/2008 4:37:05 PM
Posts: 8, Visits: 3 |
| | Interesting problem, a couple questions, some should be obvious but I will ask anyway, the idea is you can secure the blowers for some amount of time? To effect an internal or external repair that is a given, since you are ruling out an external repair you are left with only one option, internal. Can you gain entry to air header? We cut a manway into the end of a 36" to coat a joint when new above ground SS was joined to exisiting and that work had to be done by crawling into the header. It is certainly a safety concern but if approached like any confined space entry it is doable. Then the solutions will be readily apparent from welding to any other technique you might use to repair piping. Of course lining in some way is also in the cards, but my first choice for steel pipe wortking inside would be to weld or patch and weld. Since I do not know pipe diameters that is clearly a constraint, if large enough for entry there you go if not I agree with option one, dig it up, bite the bullet and fix it right, no magic there. Rich |
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| | | Forum Newbie
Group: Forum Members
Last Login: 3/28/2008 4:37:05 PM
Posts: 8, Visits: 3 |
| | Oops 18 inch, missed that...lots of bends in pipe so lining a bit tricky if not impossibel and even with linings helps to get in pipe to fix ends, like an pipe if you can get at end you can use the Insituform approach but you need to get at end so can not see how a sock lining approach might work, have you contacted any of the companies that do slip lining etc? Blind hole makes it more difficult but maybe not impossible. |
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