Pipe freezing (Cryogenic) for temporary pipe isolation has become the safest, cheapest and most effective method for allowing valve replacement and general pipework modifications.Fluid in the system no longer needs to be drained down. Therefore valuable time can be saved, and the costly process of refilling and venting can be avoided. – Toxic fluids do not have to be drained and stored or at worst disposed of and then replaced.
Direct Liquid Nitrogen pipe freezing is the most common procedure used to establish isolation on a pressurized pipeline, requiring the application of Liquid Nitrogen to the external surface of the pipe. This transfers the low-temperature Liquid Nitrogenthrough the pipe reducing the pipe fluid temperature below its freezing point and developing a freeze plug. The technology as described above affords us the ability to control the area of the pipe to be frozen.