Line Freeze

Line freezing is a method of isolating part of a pipeline that is full of a freezable product, such as water, with the assistance of CO2 or liquid nitrogen. The CO2 or liquid nitrogen freezes the product in the pipes to create a temporary “ice plug” that will block the product while work is performed downstream. This method can hold back an extreme amount of pressure to ensure that work proceeds without any risk, and once the repair work is completed, the frozen product melts and the line is ready for service.