Accu-Freeze The Controlled Liquid Nitrogen Pipe Freezing System - FAQ

Accu-Freeze Kit

What are the benefits of a Nitrogen (LN-2) pipe freeze system?

Nitrogen pipe freezing allows the ability to freeze large diameter pipe such as 6"-12".

Is it recommended on nuclear lines?

Yes, it minimizes exposure to nuclear applications of the pipe.

Does the Accu-Freeze system have any safety systems built-in?

Yes, Accu-Freeze uses its patented control system to accurately and safely create an ice plug.

What type of pipe can I freeze with the Accu-Freeze Kit?

This unit freezes all types of liquids in steel, copper, cast iron, aluminum, and plastic pipes. Please see the manual for the pipe freeze chart and adjust your times accordingly.

Can the Accu-Freeze Kit freeze moving water?

Nitrogen can freeze slightly moving water in some applications. It is not recommended and if tried may take much more time to freeze the line.

How cold does the Accu-Freeze Kit nitrogen freeze to?

Nitrogen freezes at minus 321 degrees F.

How can I isolate a line for repair, to replace a valve or extend out a new line without draining the system or causing a long shutdown?

This can be achieved through several different methods. The most popular way if the water in the line is not flowing is pipe freezing. Pipe Freeze Kits using CO-2 are an inexpensive way to get the job done when draining the system is not an option. By pipe freezing you can place a 7000 psi ice plug on one or both sides of your repair, complete the job and just let the ice plug thaw out. It just requires a pipe freeze kit and dip tube CO-2 cylinders.

Can any of these pipe freeze kits freeze lines containing glycol (anti-freeze)?

The bag-style freeze kits have a greater chance of freezing lines containing small amounts of glycol, but not within the freeze times listed. Knowing the concentration of glycol is hard to determine; consider the antifreeze in your car that came from the factory with a known percentage of antifreeze in the radiator, but who knows what percentage that is after years of use and adding fluids. Whenever dealing with glycol it is highly recommended that you obtain a sample of the line contents and perform a test freeze with the same type of pipe in a controlled environment. This test will help you determine how long it will take to get the line to freeze and how much CO2 will be needed to perform the freeze on the job site.

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