Accu-Freeze The Controlled Liquid Nitrogen Pipe Freezing System (Patent Pending)
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.
The Accu-Freeze
Technique
Throughout Qwik-Freezer's twenty-five years of pipe
freezing and maintenance our customers have requested pipe-freezing
systems that will:
- Be able to freeze larger diameter pipe
- Control the entire freeze process
In response to this Newman Tools introduces
Accu-Freeze the world’s first controlled liquid nitrogen
pipe freezing system. An Accu-Freeze ice plug starts with wrapping
copper tubing and specially designed insulated jacket around
the section of pipe to be frozen. The liquid nitrogen is supplied
by your local welding or gas distributor. The nitrogen is then
injected through our patent pending control system. By constantly
reading the surface temperature of the pipe the Accu-Freeze system
controls the flow of liquid nitrogen through the wrap and accurately
and safely forms an ice plug in lines up to 12 inch diameter.
 
Water is brought to a static
condition (no Flow). The Accu-freeze wrap is placed around the
pipe up stream from the section to be repaired. Next, set the
recommended surface temperature of the pipe in the digital controller.
Accu-Freeze takes over by automatically injecting the liquid
nitrogen through the system over the in-line ice plug. Once the
plug is formed maintenance and repair can take place without
draining or shutting off the entire system.
Accu-freeze safely
and reliably freezes your pipe.
Accu-Freeze uses it patent pending control
system to accurately and safely create an ice plug. The ice plug
only forms beneath the Accu-Freeze coil wrap and jacket (jacket
is used on a 6-12 inch pipe.) and does not expand outside of
this point. This controlled plug does not create enough pressure
to effect the integrity of the pipe. Pipe burst happen when ice
forms in an uncontrolled manner and create hydrostatic pressure
between ice plugs or against a closure in the line. (Care should
be taken to freeze 12 inches away from any closure for every
1 inch diameter of pipe). If you should have any questions please
consult a Newman Tools Freeze Technician.
Graph created with available
12 channel monitor for complete recording of the entire freeze
process
Safety Notes
Accu-freeze utilizes liquid nitrogen to
create the cryogenic temperatures necessary to form ice plugs.
Safety precautions must always be taken when using this product.
Protective clothing, gloves, goggles etc.
must be worn at all times when operating this product. Failure
to do so may result in severe frostbite.
Liquid nitrogen is heavier than air and
will displace oxygen. Proper ventilation is required
especially when operating in confined areas.
Accu-Freeze is designed to operate with
liquid nitrogen tanks fitted with 22 psi safety valves. Use with
any tanks other than properly specified will cause damage to
unit and possibly harm to the operator. Please consult
a Newman ToolsTechnician for further information.
|