An effective method of pipeline system isolation is using freeze plugs that are developed within the pipe system through the application of liquid nitrogen. The cryogenic process begins with liquid nitrogen flowing inside the aluminum freeze jackets as heat being drawn from the product inside the pipe until it reaches a temperature below its freeze point. Once a freeze plug is formed, our IFT technicians will monitor the flow of liquid nitrogen to maintain the proper sized plug.

In order to establish a freeze plug, it is imperative that pipeline the system have no flow and the freeze plug must be an established a distance from any flowing pipe branches or headers. In the event that systems can not be frozen with an ice plug because of flow in the pipe system, consider Line Stop Services as a safe and effective alternative.

How Pipe Freezing Works

Pipe freezing involves the use of liquid nitrogen in the controlled formation of a solid ice plug inside the pipeline. Once formed, the ice plug will be able to withstand very high pressures and provide an effective isolation solution that will save you money, downtime and the need of a mechanical Linestop while the pipeline modifications or repairs are made.

Pipe Freezing Services can be used to perform any of the following routine system modifications

• Valve Installations
• Pipe Section Replacement
• Equipment Isolation
• Pipe Branch Terminations
• Pipe Relocations
• Leak Detection

Pipe Freezing is suitable for use on a wide variety of pipe materials and contents, including:

Typical pipe materials:

• Carbon Steel
• Nickel Alloy
• Copper-based Alloys
• Kunifer
• Aluminium Alloys
• Stainless Steel
• Ductile Iron
• Cast Iron

Subject to certain qualifications, coated and lined pipes can also be frozen.

Typical pipe contents:

• Water
• Acids
• Coolants
• 25% and Fewer Glycol Solutions
• Alcohols
• Liquid Food Products
• Various Chemicals