Step-by-Step Guide to Pipe Relining

Pipe relining is a cutting-edge technique for repairing damaged pipes without the need for extensive digging and disruption. By creating a new pipe within the old one, this method not only restores functionality but also extends the lifespan of your plumbing system. Here’s a detailed step-by-step guide to how pipe relining works.

1. Initial Pipe Inspection and Assessment

The pipe relining process begins with a thorough inspection of the existing pipes. This is done using specialized CCTV cameras, which are inserted into the pipe to provide a clear view of its interior. This inspection helps plumbers assess the extent of the damage, identify blockages, and determine whether pipe relining is a suitable solution.

The information gathered during this assessment is crucial for planning the relining process. It allows the plumbers to pinpoint the exact location and severity of the damage, ensuring that the relining process is tailored to address the specific issues in your pipes.

2. Pipe Cleaning and Preparation

Once the assessment is complete, the next step is to prepare the pipe for relining. This involves thoroughly cleaning the interior of the pipe to remove any debris, blockages, or tree roots that might interfere with the relining process.

High-pressure water jetting is a commonly used method for this purpose. It effectively clears out any buildup, leaving the pipe clean and ready for the liner. In some cases, additional equipment may be used to remove more stubborn obstructions.

Proper cleaning is essential to ensure that the new liner adheres correctly to the existing pipe walls. A clean surface is critical for the success of the relining process and the longevity of the repair.

3. Pipe Relining Techniques

There are two main techniques used in pipe relining: Cured-in-Place Pipe (CIPP) Relining and Pull-in-Place (PIP) Relining. The choice of technique depends on the specific conditions of the pipe and the nature of the damage.

Cured-in-Place Pipe (CIPP) Relining

CIPP relining involves inserting a flexible liner coated with resin into the damaged pipe. The liner is then inflated, pressing it against the walls of the existing pipe. Once the liner is in place, heat is applied to cure the resin, which hardens to form a new, durable inner pipe.

This method is ideal for pipes with straight runs and minimal bends. It creates a seamless new pipe within the old one, effectively sealing any cracks or leaks.

Pull-in-Place (PIP) Relining

PIP relining is similar to CIPP but is used for pipes with more bends and curves. In this method, a pre-fabricated liner is pulled into the damaged pipe and then inflated to fit snugly against the pipe walls. The liner is then cured in place, forming a new, smooth inner surface.

PIP relining is particularly useful for pipes that have complex configurations, as it ensures a tight fit and comprehensive coverage of the entire pipe.

4. Epoxy and Resin Application

A crucial component of the pipe relining process is the application of epoxy or resin to create the new lining. The resin is applied to the liner before it is inserted into the pipe.

A brush coating technique is often used to ensure even distribution of the resin across the liner’s surface. The type of resin chosen depends on factors such as the material, diameter, and condition of the existing pipe.

This resin forms the new pipe lining once it’s cured, providing a strong, durable, and corrosion-resistant surface that can withstand the rigours of everyday use.

5. Curing the Relined Pipe

After the liner is inserted and positioned correctly, the next step is to cure the resin. This process hardens the resin, creating a solid, new pipe within the old one. Several curing methods can be used:

• Hot Water: Circulating hot water through the liner is a common method for curing the resin. The heat activates the resin, causing it to harden and bond to the existing pipe.
• Steam: Steam curing is another effective method that uses steam to accelerate the hardening process.
• UV Light: In some cases, UV light is used to cure the resin. This method is quick and efficient, reducing the overall time required for the relining process.

6. Final Inspection

Once the curing process is complete, a final inspection is conducted using a CCTV camera. This inspection ensures that the new lining is properly adhered to the pipe walls and that the relining process was successful.

The final inspection is a crucial step in confirming that the relined pipe is functioning as intended. It provides peace of mind that the repair has been carried out to a high standard and that the pipe is ready for use.

Benefits of Pipe Relining

Pipe relining offers several advantages over traditional pipe replacement methods:

• Minimal Disruption: Since pipe relining is a trenchless method, it requires little to no excavation, reducing disruption to your property and daily life.
• Cost-Effective: Pipe relining is often more affordable than traditional pipe replacement, as it involves less labour and material costs.
• Durability: The new lining is resistant to corrosion, tree root intrusion, and other common issues, extending the lifespan of the pipes.
• Improved Flow Efficiency: The smooth interior surface of the relined pipe enhances water flow and reduces the likelihood of future blockages.

Conclusion

Pipe relining is an innovative and effective solution for repairing damaged pipes. By following the steps outlined in this guide, homeowners and businesses can restore their plumbing systems with minimal disruption and at a lower cost than traditional methods. 

If you’re experiencing issues with your pipes, consider pipe relining as a viable option and consult a professional plumber to assess your situation.

‍

Frequently Asked Questions

1. How long does pipe relining last?
Pipe relining is designed to last for 50 years or more, providing a long-term solution to damaged or blocked pipes.

2. Can pipe relining be used on all types of pipes?
Pipe relining is suitable for most types of pipes, including PVC, cast iron, and clay pipes. However, a professional assessment is necessary to determine if relining is the right option for your specific situation.

3. Is pipe relining environmentally friendly?
Yes, pipe relining is considered an environmentally friendly option because it reduces waste and the environmental impact associated with traditional pipe replacement methods.