|
Over the past 30 years, pipefreezing for temporary pipe isolation has become
the safest, cheapest and most effective method for allowing valve
replacement and general pipework modifications.
Fluid in the system no longer needs to be
drained down, therefore valuable time can be saved and the costly process
of refilling and venting can be avoided.
Toxic
fluids do not have to be drained and stored or at worst disposed of and
then replaced.
250mm sewage mains
London
Direct Liquid Nitrogen Pipefreezing
Direct Liquid Nitrogen
pipefreezing is the most common procedure used to establish isolation on
a pressurised pipeline, requiring the application of Liquid Nitrogen to
the external surface of the pipe. This transfers the low temperature
Liquid Nitrogen through the pipe reducing the pipe fluid to a temperature
below its freezing point and developing the freeze plug.
The technology as described
above affords us the ability to control the area of the pipe to be
frozen. Once a plug has formed it is capable of withholding pressures up
to 4000psi and this is maintained to allow pipework modifications to be
undertaken with confidence.
Freeze time is dependent upon
many factors. Primarily it is the size of the pipe although system
conditions and ambient temperatures are contributing factors. Once
we know the particulars of your application we can predict the actual
freezing time.
Contact
us now for a quote.
|
When can pipefreezing be used?
Pipeline
materials that can be subjected to cryogenic temperatures include:
-
Carbon steels
-
Aluminum alloys
-
Cast iron
-
Stainless steel
-
Epoxy coated pipes
-
Nickel alloys
-
Copper base alloys
Pipeline
fluids that have been crystallised to form an ice plug include:
-
Fresh water
-
Glycol solutions
-
Sea water
-
Effluents / Sewage
-
Produced water
-
Sludges
-
Contaminated water
-
Alcohol
-
Crude oil
-
Bunker C oils
-
Fuel oils
-
Methanol
-
Lubrication oils
-
Various chemical products
For
examples of industries and customer that have used our services see our
Clients page
200mm Condenser water
main
Commercial office building, London
|
