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Case Studies

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18” Water Pipeline isolated by Pipe freezing

Client Leading supplier of chilled water
Country UAE
Year 2018
Service details

Pipe freezing can be used to isolate a line to install new valves, diversion of pipes and rectify damaged sections of pipe. It eliminates the need for expensive fluid discharging and recharging whilst minimizing system shutdown time.  In addition, it reduces the resources needed for the repair and modification work. The methodology can freeze on pipe sizes varying from ¼ “to 24” and the freeze plug can be maintained for as long as is required.

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Summary of the Project

Unique Group’s On-Site Engineering division performed 18” Double position pipe freezing as a Line Stopping solution for a leading supplier of chilled water in UAE.

pipe freezing

Pipe freezing jacket full of liquid nitrogen

Client Requirement 

The client consulted us to isolate the chilled water line to perform remedial work of cutting a pipe section and install new valves in the line to connect to a new building plot.  If isolation was not feasible, the client would have had to drain the entire length of pipe to perform the remedial works which would have been an expensive option and wastage of resources.

There was also a limitation on space at the nearby road crossing and so chamber demolition was not feasible, the requirement to design a purpose-built freezing jacket as per site conditions was called for.

Unique Solution we delivered

Unique Group designed, manufactured and installed freezing jackets according to applicable codes and specifications, we then used pipe freezing method using Liquid Nitrogen to achieve an ice plug to isolate the pipeline to install new valves in it.

cold cutting pipefreezing

Clamshell cold cutting machine was used for cutting and prepping the pipe

The mobilisation took less than one week to complete and was cost-effective and had the quickest turnaround time to fix the problem. After the freeze, the pipe segment is cut, the ice plug is shown here

Benefits delivered

  • Economical as compared to other line isolation methods
  • Mobilized to the site within a week
  • No unwanted branches/fixtures left at line stop point as compared to Line Stopping.
  • Site work was minimized to a maximum of two days when compared to other line isolation methods which can exceed six days
  • Clamshell cold cutting machine was used for cutting and prepping the pipe

pipe freezing unique group

After the freeze, the pipe segment is cut

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