Damaged presressed concrete ocean outfall pipe 2

[NADOR123]

Hi everyone

I am working on a project to stabilize an ocean outfall pipe ( 72 inch Dia.)constructed in 1980 and has cathodic protection system. A study has been completed by Pure Technologies to monitor the condition of the pre-stressed outfall pipe (section of the pipe about 2.5 miles under water) The recent results indicated that the section of the pipe in the water has a high number of wire breaks.



The outfall can not be shut dawn because there is no storage capacity in the waste-water treatment plant and temporary pipe(bypass)is not going to be allowed be environmental department besides the heavy boats traffic at the bay, therefore the slip-lining solution to stabilize the pipe is not considered. The pipe is buried about two feet below the bed level of the bay. The recommendation based on the high rate of wire breaking (717 wire breaks in 130 days) is to replace the outfall. We are trying to stabilize the pipe for the time being and until a new outfall is constructed. Any ideas about other restoration options!

Thank You

 

[Sdave999]

From what you say the answer is simple...

Get started immediately on the design and construction of the replacement outfall!

Any sort of slip-lining system needs access every so often (the greatest distance I have heard of is 1,200 feet between access points). The cost of this sort of repair can be the same as a new outfall!

 

[dicksewerrat]

Build a storage facility first for 3-4 days of output. Then slipline the pipe with a pipe 3-4 inches less in doutside diameter than existing inside diameter. While this is going on design and start construction of ther new outfall. I'd look ata HDPE line. you will have to put weights on the HDPE line.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com