Liquid Nitrogen is used
to form a freeze plug within the pipe in order to allow work to be carried out
on the system, without the need for a drain down. Pipe freezing using cryogenic
liquids such as Nitrogen is industry proven and has been in use for more than
A totally inert gas,
Nitrogen makes up almost 80% of the air we breathe. Using correct handling
procedures Liquid Nitrogen is perfectly safe and simple to use. Pipe freezing
with Liquid Nitrogen enables large diameter pipes carrying various fluids to be
frozen in a very timely and cost efficient manner.
Nitro Pipe Freeze creates
a dam around the pipe into which the Liquid Nitrogen is poured. Once a plug has
formed it is capable of withholding pressures in excess of the pressure
rating of the pipe itself. The plug is then maintained to allow pipework
modifications to be undertaken with confidence. It is then defrosted and the
system is returned to normal.