Frequently asked questions

General questions

What is relining?

With relining you can renovate cracked or damaged sewers without having to replace the entire pipe. This means you don’t need to do any costly and damaging excavations to access the pipe. It works by inserting a liner coated with resins, then forcing it to the sides of the old pipe with the use of compressed air. Once it’s cured you have a brand new pipe within the old one. This process is faster, more cost effective and have less impact on the residents than traditional renovation techniques.

Why should we choose UV Relinings system?
  1. Faster and more profitable installations.
  2. One component chemistry (no stress, no waste).
  3. Goes through multiple 90 degree bends in a 100mm pipe. 
  4. Automatic documentation.
  5. 40-100% stronger end result.
  6. Do repairs and maintenance by yourself on site.
  7. Easy-to-use touch screen system interface.
What results are expected after a relining?

After a completed renovation, the pipe has regained its static load bearing capacity as well as waterproof integrity and surface smoothness comparable to installing a new pipe by digging and replacing.

What pipes can be renovated with UV Relinings system?

Our system is developed for relining all types of lateral wastewater pipes in dimensions from 100mm to 250mm. The material of the installation to be renovated does not matter, since a new pipe with its own structural integrity will be created on the inside of the old pipes. Therefor this reliningsystem is suitable for use in pipes made of concrete, iron, plastic etc.

Is it possible to use the integrated camera on the LED heads for inspections?

No. The system has an integrated video feed system, for locating the light head inside the liner while pushing it in and at the same time inspect the liner before curing. It also documents the curingprocess for quality control purposes.

What is the assumed lifespann of an installation?

An installation with the UV Relining system has a lifespan of approx. 50 years.

Service and maintenance

What maintenance is needed on the system?

This system has been developed to minimize downtime in the event of a broken part. All components have been designed so they can be replaced quickly on site. To ensure a stabil and reliable system with minimum breakdowns, this unit requires some minor maintenance procedures including cleamning the lightpanels daily and cleaning the wheels on the pullunit monthly.

Can we do maintenance work and repairs ourself?

Yes. Our system is designed so that you can make all maintenance and repair on site, to minimize downtime in the event of a broken part.

What is the lifespan of the LED panels?

Our LED light panels have a lifespan of up to 100 hours. Keep in mind that the life of the panels can be reduced due to dirty panels or insufficient cooling.

Installation material

What is the shelf life of the chemistry?

The shelf life of our vinylester chemistry is 3 months when stored in buckets at normal room temperature (max 25°C).

If stored in buckets in temperature below 15°C, the life span is increased to 6 months which is also applicable for impregnated liner stored at maximum 25°C.

How should impregnated liners be stored?

Impregnated liners should be stored at max 25°C, well protected from UV light.

What is the liner made of, and why is it better?

Our liner is made of fibreglass.

Due to the use of fibreglass instead of the traditional we achieve a substantially more durable pipe renovation. Tests have shown that the strength (E-module) is increased by between 40-100% with our material in comparision with traditional relining materials.

Since the UV light travels easier through glas this liner ensures a fully cured liner at a much faster speed, every time!

Health / Environment

Does the installation disturb residents?

No. When installing with UV Relining system, there is minimal disturbing effects on the residents/tenants due to the use of our odor-free vinylester chemistry. 

Are there any health risk during the installation process?

No, when following the standard operating procedure, the installation of this liner is very safe. Our special vinylester is not classified as dangerous goods, has no strong or toxic fumes, and has not shown to be allergenic when in contact to skin. You will not need to use a mask when installing this, but we do recommend using safety glasses.


How long does a normal installation take?

The system has a curing speed between 30-40m when installing 150mm liner. Compared to normal epoxi resin systems, the UV Relining solution is from 2 times up to 5 times faster. 

Can impregnation of the liner be made at the job site?

Yes. Although, keep in mind that the impregnation procedure has to take place in an UV-protected enviornment.

Is the installation documented?

Yes. The whole installation process is documented on a Compact Flash memory card, including videofeed,
installation settings, temperature and preassure measurementsalong with curing speed. This simplifies finalizing of the project as well as quality controls later on.

What compressor and power supply is needed?

Compressor requirements:
1000l/min at 6-8bar. Air hose should be minimum 3/4 inch. Mist lubricator or similar should NOT be used. In hot enviornments (above 25°C) a cooler is recommended to increase life span of the LED panels. Air dryer is not essential, but recomended.

Power supply:
Standard 220V – 10 A power supply.

What pressure is used during inversion and installation of the liner?

The inversion of the liner requires between 0,2 to 0,4 bar

During the installation, a preassure of around 0,4 bars is used.

Is it possible to make an open end installation?

Yes. This can be performed by closing the end of the liner and cutting that of after curing, or by using a transparent calibration hose or a glue-end (closed piece of calibration hose glued to the end of the liner).Calibration hose or glue-end is recommended.

Is installation without a preliner possible?

Yes. Due to the constrution of the liner and chemistry, there will not be excess amounts of chemistry risking to flow into connecting pipes. The chemistry is not affected when coming in contact to water, making installation without preliner risk-free.

Is installation in pressing groundwater possible?

Yes. The chemistry is not affected by contact to water, making it possible to install the liner without preliner, even in pressing groundwater.

What bends are possible to reline with UR Relinings system?

Due to the design and construction of the pushrod and light head, the system can be used through multiple 90 degrees, even in a 100mm pipe.

How long can you reline in one shot?

The pushrod on the system is 70m. If you are using two units simultaneously, you can double the length by curing the liner from both sides. .

Can the liner expand to a bigger diameter?

Yes. Our liner can expand with up to 50%. This makes it possible to go from a 100mm up to 150mm (or 150 to 225mm) in one single shot.