PRESSURE LINING
What Is Pressure Lining?
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Pressure lining (also sometimes known as pressurised CIPP or pressure pipe lining) is a technique used to rehabilitate pipelines that operate under pressure such as force mains or heating/cooling systems - It extends the trenchless repair principle into systems where internal pressure is a key factor.
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Unlike gravity systems, pressure lines must sustain internal pressure, dynamic loads, and sometimes high operating conditions. The lining system must therefore restore structural integrity and maintain seal tightness under pressure.
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How the Process Works
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1. Pre-assessment & Isolation - The target pipeline is isolated, flow bypassed, and a CCTV inspection is carried out.
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2. Cleaning & Surface Preparation - To ensure bonding and proper resin adhesion, we thoroughly clean and condition the pipe interior.
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3. Liner Insertion - A suitably designed pressure-rated liner is inserted into the host pipeline.
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4. Curing - The liner, which is pre-impregnated is cured (thermally or via UV) while under pressure to ensure it fully conforms to the host structure.
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5. Inspection & Testing - We pressure-test the newly lined section and inspect via CCTV to confirm proper adhesion, seam integrity, and air-tight performance.
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Key Benefits
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Restores Pressure Capacity - The lining is designed to withstand internal pressures effectively, allowing the rehabilitated pipe to carry its intended load.
Minimal Disruption - Because the work is carried out internally, there’s no need for excavations or surface reinstatement.
Rapid Turnaround - The process is faster than traditional replacement, often reducing downtime significantly.
Cost Efficiency - Avoiding surface works, road closures, and large-scale excavation leads to significant cost savings.
Long-Term Reliability - When designed properly, pressure lining can deliver a durable, leak-resistant solution with a long service life.​
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Applications & Use Cases​
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Sewage force mains
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District heating or cooling mains
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Industrial process pipelines
Pressure lining is especially appealing in urban or congested settings where excavation is costly or disruptive.
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Choosing the Right Pressure Lining Solution
Not all pressure pipelines are equally suited so we assess:​
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Pressure rating and design constraints
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Pipe material, diameter, and condition
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Access constraints
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Flow bypass requirements
Our team chooses the optimal liner system and resin chemistry to meet structural and operational demands.