The Huntingdon Fusion Techniques Qwik-Freezer is a CO2 pipe freezing system capable of freezing up to 8-inch pipe. A specially designed flexible jacket is wrapped around a pipe at the points where the freeze is required. When the CO2 is injected into the space between the jacket and a pipe at a temperature of -78 degrees Celsius, the pipe contents freeze and a secure ice plug is formed, sealing the pipe.
The plug forms only in a section of the pipe covered by the jacket, so the resulting rise in pressure is small and there is no damage to the pipe. This allows users to avoid the expense and danger of system down-time by not having to drain systems of liquids to make repairs. The technique can be used safely on iron, lead, stainless steel, copper, brass and plastic pipe.
Huntingdon Fusion Techniques