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Trenchless Relining Explained

DrainsAid is an industry leading expert when it comes to trenchless re-lining. Often referred to as ‘CIPP’ (cure-in-place-pipe), it is the repair of damaged drains or sewers without the need for excavation also commonly known as ‘No-dig’.

DrainsAid specialise in various trenchless re-lining techniques, all of which have their place dependant on a variety of factors, but the general principle remains the same. A suitable liner is selected depending on the site and location, this is then inserted in to the defective pipe. Once in place, the liner bonds with the inside of the existing pipe known as the host pipe, and is cured appropriately by the selected technique creating a durable and successfully rehabilitated pipe.

Performance Improvement

The performance of damaged drains can be effected in two ways. The first is via seepage, where effluent and waste leak out of the pipes into the surrounding eco-system. The negative effects of this are obvious and need to be dealt with in a timely manner.

The second is via infiltration from the outside. During periods of heavy rainfall, or if the drain is located near a stream or river, the external water can seep in through the gaps. This in turn can over-burden the drainage system, which can lead to localised flooding if not dealt with.

Using No-Dig technology we can repair defective pipework using Cured-in-Place (CIPP) linings.

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Brawoliner is one of the most revolutionary products to hit the drainage and sewerage industry for some time. This innovative liner enables DrainsAid to re-line drains with diameter changes and multiple 90 degree bends with no wrinkles or warps – allowing for smooth flowing water.

DrainsAid are fully accredited by Brawoliner to install their products. Not only does this give us an intimate knowledge of the product, but we are able to offer warranties with all installations. DrainsAid are one of the only organisations in the UK to be able to do this.

Developed specifically with smaller diameter pipes in mind, Brawoliner can be inserted with no need for trench digging, making it minimally invasive. It can also cure at ambient temperature, however it cures much quicker by running hot water or steam through it. This simple, efficient process makes Brawoliner installation perfect for both domestic and commercial properties.

Ultra Violet (UV) Cure

A bespoke UV sensitive resin impregnated liner is pulled into position using a winch, the light train is lowered and inserted into the liner and end packers are fitted. The liner is now ready to be inflated until it has taken to the size and shape of the host pipe.

The light train is pulled through the liner, once it is at the far end of the pipe the UV lamps are turned on in sequence and the liner begins to cure under the UV light. The light train is pulled back mechanically at a controlled speed determined by the thickness of the liner and diameter of the host pipe, readings are sent back to the control unit every two seconds, ensuring a full and precise cure is achieved.

Data is simultaneously sent to the rig operator and the liner manufacturer for Quality Assurance purposes.


  • The very latest method in trenchless technology
  • Offers a considerably lower carbon footprint than that of other alternative methods as it requires a minimum expenditure of energy and removes any environmental risk of styrene pollution.
  • Can be installed quicker than any other method available making it a great solution for use in busy and highly trafficked areas.
  • Requires relatively small amount of equipment compared to other methods available meaning works can be undertaken in restricted access or hard to reach areas.

Download the UV Cure Brochure Here

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Hot/Steam Cure

A bespoke liner is designed depending on various factors such as location, site conditions and type of effluent. The liner is then inverted into the defective pipe by means of water pressure or air pressure turning it inside out leaving resin on the outside and a smooth coating on the inside. Once in-situ the liner is cured to the latest WIS specification using a steam or hot water boiler. The liner will be coated with polyurethane or polypropylene for heat resistance resulting in a durable and successfully rehabilitated pipe with a life expectancy to rival any replacement pipe.


  • Up to 500m of liner can be installed in one go dependant on the drainage layout
  • Large diameter pipes can be accommodated
  • Capable of performing large scale repairs with a relatively small site footprint

Download the Hot Cure Brochure Here


Ambient Cure

An appropriate sized resin impregnated liner tube is cut to length and installed using an inversion drum and compressed air. The resin is then left to cure purely via the ambient temperature of the drain. This reduces the amount of equipment that needs to be taken to, and used, on site.


  • Extremely fast and versatile method
  • The speed of this process enables existing flows to be managed effectively
  • Can be installed from one access point

Download the Ambient Lining Brochure Here

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Patch Repair

The glass fibre patches are inserted and positioned on an inflatable packer which, when in place, is inflated to form a tight bond between the patch and the pipe wall at the point of damage. Once the curing is complete the inflatable packer is deflated and removed from the pipe leaving a completed localised patch repair.


  • Great solution for localised pipe integrity issues such as root ingress, cracks, fractures, displacements and holes
  • Fast and cost effective method to repair localised damage

Quick Lock

Quick-Lock consists of a rolled V4A Stainless Steel sleeve covered with an EPDM rubber seal specifically designed as a patch repair system for repairing voids in pipes. The stainless steel sleeve ratchets into place using an inflatable packer and is secured by an integral rail and lock system.


  • Allows flows to be maintained during installation
  • No curing time allows very quick installation
  • No active chemicals or glues
  • Can be linked together to form a continuous repair

For more information about our range of re-lining services, or to speak to one of our team, call 0800 0180123.


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‘Sliplining’ refers to the insertion of a new ‘carrier’ pipe into an existing damaged, or deteriorated ‘host’ pipe. The ideal host pipes for slip lining are straight with no deformities.

There are two types of slip lining:
Continuous slip lining involves installing prefabricated piping to run the entire length of the pipe under repair. This lining can be installed in lengths of up to 1000m. Segmental sliplining comes in shorter lengths that are joined onsite until the job is complete.


  • Cost-effective solution to pipe renovation where the current internal diameter of a pipe is larger than needed
  • Quick Installation. Continuous sliplining can be installed at a rate of up to 50m per hour. Segmental sliplining can be fitted at 15m per hour
  • Can be used in a wide variety of pipe sizes. Continuous sliplining can be used on pipes with diamteres between 63-1500mm
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