Pipe Freezing
Pipe freezing is method to freeze the content of a section of pipe by applying cryogenic (i.e. very low temperature) freezing agent in a controlled manner. when the ice plugs are formed maturely, maintenance works to the pipe can be carried out between the ice plug without draining massive amount of pipe fluid.
![](https://www.ryanwilks.com.au/wp-content/uploads/2015/09/pipe-freezing.jpg)