Pipe Rehabilitation




Drain Lining

The epros®DrainLining method

Complete renovation of entire pipe runs in sewer systems without excavating.
The epros®DrainLining method is a cured-in-place pipe lining (CIPP) process used in trenchless pipe and sewer rehabilitation ("no-dig" applications).
The start or end point can be a manhole, inspection hole or cleaning eye or a open cut pipe. The basic condition is that there is enough space to place the inversion fitting of the inversion unit or water rig. Also, the liner may pass through several manholes between the start and end points, inclusive of manholes with channel diversion. It is possible to install the liner along channel diversions or invert bends at an angle up to 90 degrees. 
The process allows nominal diameters between DN 30 and DN 1200 as well as diverse eggshaped and special sewer sizes to be rehabilitated and obsolete laterals to be closed.

The various general technical approvals (DIBt approvals) apply to different pipe sizes and vary according to resin system or liner material.


This process uses a flexible tube (= liner) of corrosion-proof synthetic and/or glass fibres, which is wetted inside with reaction resins and introduced into the host pipe run through a manhole, access pit or access eye with the help of an inversion unit.

Air pressure or water is used to transport the liner down to the point of repair. During this process the liner tube is inverted, so the resin wetted liner side (inside before inversion) is turned outside, away from the effluent and forced against the pipe wall. There it remains under pressure from the filled-in air of water until the resin is cured.


The resin-impregnated liner in the pipe section can be cured with hot water, steam or at ambient temperatures, depending on the requirements of the resin system used. After final cure of the reaction resin, the liners form a tight positive and frictional fit with the host pipe wall. The pipe-in-pipe system so obtained forms an integral system with the host pipe and fully meets the hydraulic requirements.

Technical Components

1) epros®SteamGen 
2) epros®control tape 
3) Inversion unit or inversion pressure lock
4) Air supply
5) Steam / air feed line
6) Steam line
7) Steam telemetry unit  / steam mixing lance
8) Steam outlet valve
9) DrainLiner
10) Temperature sensor
11) Temperature measuring point at pipe invert





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