Pipe Freeze (non-invasive solutions)

[EngWade]

I have just been introduced to a procedure for "shutting off" water lines using liquid nitrogen. The basic procedure (as I understand it) is to wrap an existing water line with a "jacket" and then pumping liquid nitrogen through the jacket, resulting in creating a "frozen plug" of water inside the water main. To me, this sounds like a great, non-invasive solution when shutting off water pressure by typical means (stop valves, gate valves, etc) is not possible. Is anyone familiar with this solution that could offer up some experience or pros/cons?

Thanks in advance.

 

[msquared48]

Other than a ruptured pipe if the proper thawing steps are not taken - I can't think of anything.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[bimr]

It has been around for some time:

http://www.alliedflow.com/pipemore.html

http://www.n-two.com/pipefreezing.php

http://www.midlandcryogenics.com/pipefreezing.htm

 

[dicksewerrat]

We used to use dry ice or freon to freeze small lines. Don't let anyone touch the line with bare skin. Also make sure you ventilate the excavation before anyone enters. We saw one guy use propane. Scared us and the fire dept. when we called them.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com