How Long Do Relined Pipes Last?

Pipe relining has emerged as a revolutionary solution for damaged plumbing systems across Australia, offering property owners a non-invasive alternative to traditional pipe replacement. With its growing popularity comes the crucial question of durability – exactly how long can property owners expect their relined pipes to last? This article examines the longevity of relined pipes, analysing the factors that influence their lifespan and comparing them with traditional piping materials.

Relined pipes demonstrate impressive durability, with most professional installations lasting between 30 to 50 years. This longevity represents a significant advantage for property owners seeking long-term plumbing solutions without the disruption of excavation, making pipe relining worth it as a long-term investment.

The expected lifespan of relined pipes varies depending on their specific function within a plumbing system:

• Sewer pipes: Due to constant exposure to corrosive substances, sewer pipes typically fall on the lower end of the lifespan spectrum, lasting approximately 30 to 40 years after relining.
• Water supply pipes: Carrying clean water with less chemical exposure, these pipes often enjoy longer lifespans, potentially reaching the full 50 years or more.
• Stormwater pipes: With intermittent use and minimal chemical exposure, stormwater applications may achieve the higher end of the lifespan range.

Several key factors influence how long relined pipes will last in Australian conditions:

The quality of materials used in the relining process significantly impacts longevity. High-grade epoxy resins and CIPP liners demonstrate superior resistance to wear, corrosion, and chemical damage. Mitchell Hook, professional plumber from North East Plumbing, says: “Not every epoxy resin is created the same. Cheap materials often result in a short lifespan“.

Premium materials might require a higher initial investment, but typically result in more durable repairs that provide better long-term value.

The skill and experience of the installation team represents perhaps the most critical factor determining pipe relining longevity. Professional pipe relining ensures proper pipe preparation, accurate liner placement, and correct curing, all essential for maximising lifespan.

Licensed and experienced plumbers, like the team at North East Plumbing, follow proper installation procedures that ensure the liner adheres seamlessly to the existing pipe.

Australia’s diverse climate and geological conditions create unique challenges for pipe durability:

• Soil composition: Different soil types exert varying pressures on underground pipes. Aggressive soils can accelerate external corrosion, while clay soils common in many Australian regions can cause pipes to settle and crack over time.
• Temperature fluctuations: Australia’s temperature variations cause pipes to expand and contract, potentially affecting the liner’s integrity over time.

The purpose and usage patterns of the plumbing system impact longevity. Commercial pipes often endure heavier use than residential ones and may require more frequent maintenance. The types of substances flowing through the pipe also affect durability, with more corrosive materials potentially reducing lifespan.

Regular maintenance significantly extends the life of relined pipes. Periodic inspections, cleaning, and prompt repairs of minor issues prevent significant problems from developing. Property owners who avoid harsh chemicals and follow proper waste disposal practices further contribute to pipe longevity.

While relining can effectively reinforce damaged pipes, the condition of the original structure still matters. If the existing pipe is completely collapsed, relining may not be a viable solution. The relining process works best when addressing cracks, leaks, or root intrusion in structurally intact pipes.

When evaluating the longevity of relined pipes, it’s useful to compare them with traditional piping materials used in Australian plumbing systems:

This comparison demonstrates that properly relined pipes offer durability comparable to traditional materials. While cast iron pipes may potentially last longer under ideal conditions, they’re susceptible to corrosion and significantly more expensive to replace.

Relined pipes can match or exceed the lifespan of galvanized steel pipes (typically 20 to 50 years) and approach that of copper pipes (50 to 70 years), all without requiring extensive excavation work.

The durability of relined pipes in Australia is supported by rigorous regulatory standards:

Since November 2018, Australian regulations have mandated that all pipe relining products must receive WaterMark approval and be installed according to the Plumbing Standard of Australia AS3500. This certification ensures that materials meet national safety, durability, and performance requirements.

The comprehensive guidelines in AS/NZS 3500 cover all aspects of pipe relining, including:

• Material compliance for suitable durability under expected conditions
• Structural integrity requirements to withstand operational pressures and loads
• Chemical resistance specifications for corrosion and abrasion protection
• Installation practices, including pre-cleaning and inspection
• Testing and inspection protocols to verify proper installation

The WaterMark Technical Specification WMTS-518:2017 establishes specific requirements for cured-in-place pipes, including wall thickness, mechanical characteristics, and chemical resistance standards. These specifications ensure that relined pipes meet consistent quality standards throughout Australia.

Australia’s unique environmental conditions present several challenges that can impact pipe durability:

Australia has many large tree species with extensive root systems that aggressively seek water sources. These roots often infiltrate underground pipes, causing blockages and structural damage. Pipe relining creates a seamless, root-resistant inner layer that helps prevent future root intrusion.

Many Australian regions have clayey soil that expands and contracts with moisture changes, causing pipes to settle and crack over time. Relined pipes provide reinforcement that makes the plumbing system more resilient to these soil movements.

Australia’s extensive coastline means many properties face saltwater corrosion issues that can weaken traditional pipes. The epoxy resin lining in relined pipes acts as a protective barrier against this corrosion, extending the plumbing system’s functional life.

Australia’s climate includes significant temperature variations that cause pipes to expand and contract. The flexibility and strength of properly cured resin liners help pipes withstand these temperature-related stresses.

Australian summers can reach temperatures in the high 30s or even exceed 40°C, placing additional pressure on pipes as water usage increases for garden watering, more frequent showers, and washing machines. Relined pipes with proper curing can better withstand these seasonal pressures.

To ensure relined pipes reach their full potential lifespan in Australian conditions, several maintenance practices are recommended:

Scheduling routine CCTV inspections allows professionals to monitor pipe condition and identify potential issues before they become serious problems. Professional cleaning removes debris and buildup that could affect pipe integrity.

Using root-inhibiting chemicals around pipe areas, conducting regular root-cutting maintenance, and being strategic about landscaping can help prevent tree roots from damaging relined pipes.

Harsh drain cleaners and other chemicals can potentially degrade pipe materials over time. Property owners should avoid flushing grease, wipes, or caustic chemicals that could affect the lining.

A pipe can generally be relined only once. Relining involves creating a new pipe within the existing one using resin-saturated liners, which reduces the internal diameter of the pipe slightly. Repeated relining would further reduce the diameter, potentially compromising flow capacity and functionality. Additionally, if the pipe is severely damaged or collapsed, relining may not be possible, and replacement would be required.

Pipe relining, despite its advantages, has several disadvantages. It is not suitable for severely damaged or collapsed pipes and cannot correct existing slope issues or structural problems like bellying. The process reduces the pipe’s internal diameter, potentially affecting flow capacity, and the relined pipe may not be as strong as a new one.

Installation requires specialised equipment and expertise, increasing costs, and access can be challenging for hard-to-reach pipes.

Additionally, relining is not a permanent solution and may degrade over time, requiring future maintenance or replacement. It also has material limitations, such as not being suitable for all types of pipes, and can be affected by imperfections in the host pipe. Overall, while relining is effective for many repairs, its limitations must be carefully considered before choosing this method.