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Trenchless Pipe Rehabilitation: The Process of Pipe Relining

What is pipe relining?

Pipe relining is a trenchless technology that involves inserting a new lining material (typically made of epoxy or resin) into the existing pipe. This lining adheres to the inner surface of the damaged pipe, creating a new, structurally sound pipe within the old one.   

The process typically requires access points at either end of the pipe, but it does not involve digging up the entire length of the pipe or creating a trench. It is similar to the process of traditional pipe repair methods. 

Traditional pipe repair methods often involve excavation or digging to access and replace the damaged pipe. These methods may include open-cut excavation, where a trench is dug to expose the pipe for repair or replacement. This differs from trenchless technology, as it requires significant digging and disruption to the surrounding area.  

The importance of pipe relining

Pipe relining services are important because it offers a cost-effective and efficient solution to rehabilitate damaged or deteriorated pipes, extending their lifespan and ensuring the proper functioning of the industrial drainage system. It minimises disruption to the surrounding environment, reduces the risk of leaks or blockages, and helps avoid more extensive and costly repairs or replacements.   

What is Pipe Relining for Larger Drainage Systems

A cost-effective and environmentally friendly option

Pipe relining for larger drainage systems is a method used to repair or rehabilitate underground pipes without extensive excavation. It is a cost-effective and efficient alternative to traditional pipe replacement methods.  

Pipe relining services involve inserting a new pipe lining material into the existing damaged or deteriorated pipe to create a seamless and structurally sound inner surface. 

Pipe relining offers several benefits for larger drainage systems: 

Minimised disruption: Excavation is significantly reduced or eliminated, resulting in minimal disruption to the surrounding infrastructure and the environment. This makes it particularly suitable for urban areas or places where excavation is difficult. 

Cost-effective: Pipe relining is generally more cost effective than traditional pipe replacement methods, eliminating the need for extensive digging, pipe restoration, and landscaping. 

Increased durability: The new lining provides a smooth inner surface. This chemical can also improve the flow capacity and longevity of the pipe. 

Versatility: Pipe relining can be applied to various types of pipes, including clay, concrete, PVC, and cast iron. It can accommodate different pipe diameters and handle bends and junctions effectively. 

Minimal loss of pipe diameter: The relining process typically results in a minimal reduction in the pipe’s diameter, ensuring that the flow capacity of the system is not significantly compromised. 

Environmentally Friendly: Pipe relining is more environmentally friendly than traditional pipe replacement. It reduces the amount of construction waste generated from excavated pipes and minimises the disturbance to the natural surroundings. 

Pipe relining is a specialised process requiring trained professionals with expertise in the techniques and materials involved. Contact our team at Enviro Drainage Services if you need experts to assess the suitability and feasibility of this method for your drainage system. 

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What is the Purpose of Pipe Relining

Repair and rehabilitate

The purpose of pipe relining is to repair and rehabilitate underground pipes that are damaged, deteriorated, or experiencing issues such as leaks or blockages. It offers an alternative solution to traditional pipe replacement methods, minimising the need for excavation and reducing disruption to the surrounding environment. 

 The main objectives of pipe relining are as follows: 

  • Restore structural integrity and functionality of damaged or deteriorated pipes so a new, seamless lining rests within the existing pipe and seal out cracks, leaks and other defects. 
  • Prevent future problems by taking proactive measures in reinforcing the interior of the new lining, rendering them able to resist corrosion and other issues  
  • Enhance the durability and lifespan of the pipe. The new lining creates a smooth inner surface that improves flow capacity and reduces the risk of blockages and buildup. 
  • Reduce labour, material and pipe restoration by eliminating the need for excavation, which can be costly and time-consuming.  
  • Minimise disruption in restricted areas or sensitive surroundings such as roads, buildings, or landscaped areas. The limited excavation ensures that the surrounding environment and infrastructure remain secure and undisturbed.  
  • Adapt to a wide range of pipe sizes, types, and conditions. Pipe relining can be applied to various kinds of pipes, including clay, concrete, PVC, and cast iron. It is adaptable to different pipe diameters and can navigate bends and junctions effectively. 

Overall, pipe relining aims to provide an efficient, cost-effective, and sustainable method for rehabilitating and restoring underground pipes, extending their lifespan, and maintaining the functionality of drainage systems. 

How often should your drainage system undergo Pipe Rehabilitation?

The frequency with which a commercial drainage or large drainage system should undergo pipe rehabilitation services depends on several factors, including the age of the system, the type of material the pipes are made of, the amount of traffic the system receives, and the environment in which the system is located. 


The amount of traffic the system receives also affects the frequency of rehabilitation. Systems that receive a lot of traffic are more likely to experience wear and tear than systems that receive less traffic. The environment in which the system is located can also affect the frequency of rehabilitation. Systems in areas with harsh weather conditions are more likely to need pipe rehabilitation services than those in areas with milder weather conditions. 

Age of the Pipes 

The age of the pipes is an essential factor in determining the need for pipe rehabilitation. Older pipes are more susceptible to deterioration and damage and may require more frequent rehabilitation than newer ones. 

Material of the Pipes 

The type of material used in the pipes can affect their longevity and the need for rehabilitation. Different materials have varying degrees of durability and resistance to corrosion and other forms of deterioration. For example, older cast iron or clay pipes may require more frequent rehabilitation compared to modern PVC pipes. 

Usage and Maintenance 

The usage and maintenance practices of the drainage system play a role in determining the frequency of pipe rehabilitation services. Systems that experience heavy usage or are subject to harsh conditions, such as chemical exposure or high-pressure flows, may require more frequent rehabilitation. Regular maintenance, including drain cleaning and pipe inspections, and relining, can help identify issues early and prevent the need for extensive rehabilitation

Environmental Factors 

Environmental factors can impact the condition of the pipes. For example, areas with high soil acidity, corrosive groundwater, or high tree root activity may require more frequent pipe rehabilitation to address corrosion or root intrusion. 

Previous issues 

If the drainage system has a history of recurring problems, such as frequent leaks, blockages, or collapses, it can be necessary to conduct pipe rehabilitation more frequently to address these issues and prevent further damage. 

Regular inspections using CCTV cameras or other methods can help identify the condition of the pipes and detect any signs of damage or deterioration. Based on the inspection results, the frequency of pipe rehabilitation can be determined. 

Step 1.

CCTV Assessment

The process begins with a thorough inspection of the drainage system using CCTV cameras to identify the location and extent of the damage. Once the assessment is complete, the pipe relining process can begin 

Step 2.

Pipe Cleaning

The existing pipe is cleaned using high-pressure water jetting or mechanical cleaning techniques to remove debris, scale, or blockages.  

Step 3.

Preparation of Lining Material

A liner is created by impregnating a flexible tube or sleeve with a resin mixture. The resin may be epoxy-based, polyester-based, or both in conjunction with fibreglass and any other suitable material, depending on the project’s specific requirements 

Step 4.

Insertion of Liner

The prepared liner is inserted into the damaged pipe using various methods, such as inversion, pulling, or winching. The liner is positioned using air or water pressure to ensure it adheres tightly to the inner walls of the existing pipe.  

Step 5.

Curing the Liner

Once the liner is in position, it is cured or hardened. This can be achieved by circulating hot water or using ultraviolet light, depending on the type of resin used. Curing times vary but typically range from a few hours to several days. 

Step 6.

Final Inspection

After the curing process, the relined section of the pipe is inspected again using CCTV cameras to ensure the lining is properly sealed and aligned with the original pipe. 

Frequently Asked Questions

Trenchless pipe relining is a method used to repair or rehabilitate underground pipes without the need for extensive excavation. It involves inserting a flexible lining into the existing pipe and curing it to create a new, durable pipe within the old one. 

The material used for trenchless pipe lining can vary, but commonly used materials include epoxy resin, polyester, or fibreglass. These materials are typically flexible and capable of adhering to the inner surface of the existing pipe. 

Some disadvantages of trenchless pipe lining include the potential for reduced pipe diameter, limited accessibility in certain situations, and the need for specialised equipment and expertise. It may also be more expensive than traditional excavation methods for smaller-scale projects. 

Pipe relining is typically made of a flexible material impregnated with resin, such as polyester or fibreglass. These materials are designed to harden and create a new, structurally sound lining within the existing pipe. The specific type of material used can depend on factors like the pipe diameter, location, and required durability. 

Our Methods and Services:

Here at Enviro Drainage Services, we provide three types of pipe relining services 

Cured in Place Pipe (CIPP) 

Digging up assets for replacement can be expensive, requiring disrupting other things like roads, buildings or utilities. To avoid this, trenchless solutions allow the drains and pipes to be repaired while in place. 

Enviro Drainage Services will use a CCTV survey to determine the precise issue with your piping. Once that has been identified and suitable access is available, our engineers will perform a non-invasive pipe repair 

This pipe lining system installs a smooth sleeve into the line, which covers the defective or damaged pipework to allow full and free flow to be restored. 

Quick-Lock/Smart Lock 

Smart Lock is used in gravity sewer lines and stormwater networks. It is manufactured and designed in Australia with WSAA and Wrc approvals. 

 Quick-Lock is used for: 

  • Cracked systems
  • Fragmented pipes
  • Infiltration and exfiltration
  • Root intrusion
  • Leaks
  • Overcoming joint displacement

 Quick Lock sleeves restore a pipe’s structural integrity and seal out groundwater. They are carefully designed to minimise diameter loss and outlast any other rehab. 

Serving as liner end seals, our Quick-Lock End Caps strengthen a CIPP liner at its most vulnerable points—the ends. This mechanical solution prevents liner and host pipe infiltration or exfiltration for the lifetime of a close-fit liner.  

They are particularly effective on EX, spiral, and U.V.UV cured liners. Stronger and easier to install than other end caps, they are a must-have insurance policy for a long-term watertight lining project. 

UV Core Pipe Relining Material

UV Relining 

UV Cure Pipe Relining is characterised by extremely fast curing times, site flexibility, and total quality management of a seamless product. 

Compared to more traditional no-dig CIPP, it is faster, with an impressive cure rate of just one metre per minute. U.V.UV also requires less equipment, so site set-up and take-down is quicker, making it especially suitable for busy locations like roads, railways and airports or geographically awkward sites with little room to maneuver. 

UV Core Pipe Relining Equipment


The trenchless pipe relining technology provides a more efficient, cost-effective, and minimally disruptive alternative to traditional pipe repair methods. It offers faster repairs, preserves infrastructure, and provides long-lasting solutions while minimising the need for extensive excavation. At Enviro Drainage Services, you can trust us to provide the best quality pipe relining services.