UV-CIPP creates a glass-fibre reinforced plastic pipe within an existing pipeline. It is a structural liner, rather than a surface coating.
The host pipe is assessed first. Liner selection, wall thickness, resin and curing configuration follow the project design and the manufacturer’s requirements. Gravity sewers can often be accessed through existing manholes; pressure pipelines may require access pits.
Assess the pipe, manage the flow, clean and survey by CCTV. Remove obstructions before lining.
Condition survey · geometry · access02
Pull in the liner
A ready-to-install, resin-impregnated liner is winched into the pipe using the specified protection and monitored pulling force.
Liner identity · handling · pulling force03
Inflate
End packers and controlled air pressure bring the liner against the host pipe wall.
Pressure steps · liner positioning04
Cure with UV light
The light train travels through the liner at the specified speed. The curing process is recorded.
Speed · temperature · pressure · lamp status05
Finish the installation
Remove the temporary inner foil for the gravity liner system, finish the ends, reopen laterals and seal the connections.
End finishing · connections · laterals06
Test & hand over
Complete the agreed CCTV, leak tests and laboratory sample programme. Assemble the installation record.
Survey · tests · samples · documentation
Process overview for understanding the work. The system-specific method statement, design and installation manual govern execution. IDS’s supervision scope is agreed separately.
See the principle in motion12 seconds · Silent film
A simplified cutaway separates the structural liner from the host pipe, brings them together, then shows a UV light train moving through the lined pipe. The finished lining remains for inspection. The six-step overview above describes the complete site process.
GRAVITY LINER / BUILD-UP
Every layer has a purpose.
01
02
03
04
SCHEMATIC / NOT TO SCALE
01
Protection and barrier films on the host-pipe side.
02
Resin-impregnated ECR glass fibre provides the structural laminate.
03
The defined inner surface layer is matched to the liner system.
04
For the gravity system shown, the inner foil is removed after curing.
Pressure liners use a different build-up, including a permanent inner coating. The removable gravity-liner foil must not be confused with that coating.
RELINE / MANUFACTURER SYSTEMS
SELECT FOR THE APPLICATION
One technology. Distinct requirements.
System
Application
Range
Selection context
Alphaliner 500G
Gravity sewers & drains
DN 150–1200
For small and medium gravity pipelines.
Alphaliner 1800H
Gravity sewers & culverts
DN 150–2000
For higher structural demands and larger profiles.
Alphaliner PN
Pressure pipelines
DN 200–800
Up to PN 25 depending on diameter and design. Availability is market-specific.
AQUA.UV® CIPP
Drinking-water mains
Project-specific
Dedicated drinking-water system. Confirm diameter, pressure, approvals and local availability.
Product ranges are an orientation, not a project specification. Wall thickness, curing limits, installation length and approved configuration require current manufacturer confirmation.
BEFORE A LINER IS ORDERED
Select for the pipe. Then check the whole system.
Gravity: loads and geometry
For 500G and 1800H, review the host-pipe condition, groundwater, soil and traffic loads, profile and required flow area. Higher laminate stiffness can allow a thinner design, but wall thickness must also lie within the approved curing window.
Pressure: a different design task
Alphaliner PN uses reinforced glass fibre and a permanently bonded internal barrier. Review operating pressure, pressure cycles, vacuum, bends, end connections and access pits. A gravity-liner installation method cannot simply be reused.
Drinking water: the complete approved system
AQUA.UV is a dedicated drinking-water liner. Verify local acceptance, the exact product listing, resin, end connections, cleaning and commissioning requirements. Confirm the available diameter and pressure configuration with the manufacturer.
Resin and installation length
Select resin against the medium, temperature and chemical exposure. Confirm each measured section against the liner, wall thickness, handling limits, cable configuration and current installation instructions.
A truck-installed platform for demanding liner configurations and larger diameters.
EQUIPMENT / PLANNING GUIDE
Match the configuration. Not just the diameter.
RE Compact / Plus
DN 150–600
Light chain; a suitable manhole core extends the range to DN 1000. Cable up to 150 m.
REE 2000 Mobile
DN 150–1200
Usual municipal configuration. Cable options and light source affect the diameter and wall thickness that can be cured.
REE 4000 Professional
DN 150–2000
Multiple light-source configurations. Professional installation with a 350 m curing cable; Power Cube for DN 1400–2000.
Diameter coverage is indicative and configuration-dependent. Before mobilisation, confirm light source, packers, wheel sets, curing limits, usable cable length, electrical supply and ambient operating limits. Cable length is not the same as an approved installation length.
Planning ranges summarised from RELINE’s October 2026 technical brief; confirm the current configuration with the manufacturer.
GULF & NORTH AFRICA / SITE PLANNING
The climate changes. The checks stay essential.
Heat, logistics and operating networks shape the installation plan. These are the questions to resolve before materials and crews reach site.
Heat, light and liner storage
Plan temperature-controlled transport and monitored storage. Keep the liner protected from light and manage its remaining shelf life against the delivery and installation programme. Confirm the limits for the actual liner and resin; special formulations can have different requirements.
Installation windows and equipment
Arrange shade, suitable equipment cooling and practical working hours. Confirm ambient operating limits and generator capacity. Check voltage and frequency compatibility explicitly, including on projects with a 60 Hz supply.
Effluent and groundwater
Collect the medium temperature and chemistry before choosing the resin. Assess groundwater, infiltration, external protection and any pre-liner requirement. Seal active infiltration as required by the approved method.
Access, flow and site interfaces
Plan bypass pumping, access pits or manhole access, lifting and liner handling. Coordinate road, rail, port or industrial operating windows with the relevant asset owner.
Specifications and acceptance
Identify the project design basis, consultant approval route, inspection plan and laboratory requirements early. Manufacturer approval, contractor qualification and project acceptance are separate checks; one does not replace the others.
Logistics and a realistic programme
Order against verified measurements and confirmed dates. Allow for production, freight, clearance, storage, specialist attendance and test turnaround. Review the contingency plan before committing to a lining window.
RELINE lists DIBt and WRc among the approvals for its gravity liners. Review the current document for the exact product, resin, profile, diameter and installation conditions, together with the project specification.
Pressure and drinking water: verify separately
Alphaliner PN is presented by RELINE as ISO 11297-4, Class A. Drinking-water suitability requires the applicable product listing and local acceptance; do not carry a gravity-system approval across to pressure or potable-water work.
Design life is not a warranty
RELINE’s October 2026 technical brief describes 50-year long-term material values derived from creep testing. That is a structural design basis under defined assumptions. It is not a blanket 50-year product or installation warranty.
An installation needs its own evidence
Agree the test programme before work: liner identification, curing log, CCTV, leak or pressure testing as applicable, and laboratory results for the specified samples. Record acceptance decisions and close out deviations against the contract requirements.
Manufacturer evidence concerns the named product and its stated scope. It does not constitute an IDS certification. Request current certificates and project-specific confirmation from the responsible supplier.
RENEWAL / PRACTICAL TRADE-OFFS
Preserve more. Disturb less.
Consideration
Open-cut replacement
UV-CIPP rehabilitation
Access
Excavation along the replacement route; reinstatement depends on the site.
Gravity lining can use existing manholes. Pressure work may still need access pits.
Resources
Excavated material, new pipe and surface reconstruction form part of the work.
Reuses the existing route; assess liner production, transport, preparation and curing as well.
Operations
Plan road closures, utility interfaces and the replacement programme.
Plan flow diversion, work areas, installation windows and testing; disruption is reduced where the method is suitable.
Selection
May be necessary where alignment, capacity or pipe condition requires replacement.
Suitability depends on survey, structural design, hydraulic requirements and access.
Compare environmental impact over the same pipe length, diameter, function and assessment boundary. A project carbon assessment should include materials, transport, site energy and reinstatement; a manufacturer study does not predict every project’s result.
IDS / INDEPENDENT OVERSIGHT
The process is recorded. The evidence must connect.
Our technical attention connects the agreed requirements to the installation record. Scope is defined for each assignment.
