TPT January 2016

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Technology News
52 January 2016
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Freeze sealing for pipe repairs
CONTRACTORS and maintenance
personnel involved in repairing pipework
in buildings and other constructions
have long faced the problem of making
repairs on tubes and pipes when they are
full of fluid and may not be economically
viable to drain.
The Accu-Freeze® pipe freezing
system is able to freeze a plug in fluid
either side of a repair zone, isolating it,
to allow work to be carried out without
draining the whole system.
Luke Keane, technical support at
Huntingdon Fusion Techniques (HFT),
said, “Accu-Freeze utilises liquid
nitrogen (LN2) in a controlled way to
freeze stationary liquids in a selected
section of pipe or tube. By controlling the
surface temperature of the pipe or
tube, Accu-Freeze can accurately
and safely form an in-line ice plug,
capable of withstanding 136 bar in
diameters up to 12" (300mm).”
To form an ice plug, the water
or liquid inside the pipe or tube is
brought to a static condition and
a specially designed insulated
jacket is placed around the section
to be frozen, upstream from the
repair zone. Once the plug is
formed, maintenance and repair
can take place without draining
or shutting off the entire system.
The controlled ice plug only forms
beneath the Accu-Freeze jacket.
It does not expand outside of this area
and does not create enough pressure to
affect the integrity of the pipe.
The primary advantages of the
patented Accu-Freeze system include
the increased freezing capability of
LN2 and the ability to control the pipe
wall temperature throughout the freeze
process.
The LN 2 injections are automated,
which reduces the operator’s workload
and reduces the amount of LN2 that
is consumed. Accu-Freeze can also
be operated remotely, which makes
it suitable for use inside ‘hot’ nuclear
areas where personal exposure must
be kept below certain limits. The Accu-
Freeze technique is able to freeze large
diameters and control the entire freeze
process.
Huntingdon Fusion Techniques – UK
Fax: +44 1 554 836 837
Email:
Website:
Accu-Freeze uses liquid nitrogen to freeze
stationary liquids, to form an ice plug inside the tube