How Accu-Freeze™ Works

A typical Accu-Freeze™ process starts with wrapping copper tubing and a specially designed insulating jacket around the section of pipe to be frozen. The liquid nitrogen is supplied by your local welding or gas supplier. The nitrogen is then injected through the control system. By constantly reading the surface temperature of the pipe, the Accu-Freeze™ system controls the flow of liquid nitrogen through the coil of copper tubing and safely creates the ice plug under the area covered by the copper tubing and insulating jacket only. The plug does not extend outside the specific “freeze zone”.

Accu-Freeze utilizes liquid nitrogen in a controlled system to freeze stationary liquids in a selected section of pipe or tubing. By controlling the surface temperature of the pipe, Accu-freeze can accurately and safely form an in-line ice plug, capable of withstanding 2000 psi in pipes up to 12 inch diameter. This temporary plug isolates the section, thus allowing repairs and modifications to be made without shutting off or draining down the entire system.

Throughout COB Industries’ nearly 40 years of pipe freezing experience with our popular Qwik-Freezer® liquid CO2 freeze systems, our customers have requested pipe freezing systems that will:

  • be able to freeze large diameter pipe
  • control and simplify the entire freeze process
  • control the temperature that the pipe wall is exposed to (particularly in the nuclear industry)
  • minimize exposure in nuclear applications
  • reduce the operating costs associated with pipe freezing by limiting the consumption of liquid nitrogen
In response to these needs in the industry, COB Industries introduced Accu-Freeze™--the world’s first controlled liquid nitrogen pipe freezing system, and the most efficient pipe freezing system available.

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