GRP Segmental Liners Channeline Sewer Systems products are designed and manufactured to provide long term, structural, cost-effective, and safe solutions for the renovation of derelict or unstable culverts and sewer pipes without the need for disruptive excavation.

Channeline can be manufactured to fit any size and/or shape. The main structure of the liner and the make-up of the liner wall incorporates a corrosion barrier on the inside surface followed by a layer of preformed, powder bound, chopped strand glass mat consolidated with isophthalic resin.

Glass Reinforced Plastic Channeline sewer lining system incorporates interlocking glass fiber reinforced plastic (GRP) pipe segments manufactured from corrosion resistant isophthalic resin. These segments, which are designed as one piece, two piece, or multi-piece systems, can be assembled inside the host sewer providing a low-impact, 'Trenchless' repair. Channeline systems can be designed for almost any sewer profile whether circular, oval, vertically sided, symmetrical, or non-symmetrical; thereby achieving maximum design flexibility. In most cases, Channeline units can be laid under normal or restricted flow conditions starting from an upstream position, eliminating the need for by-pass pumping.

Multi-layer Construction The surface corrosion layer is reinforced with a "C" glass tissue. The center core of the unit consists of a silica sand/isophthalic resin matrix, which is followed by further layers of a powder bound mat and isophthalic resin matrix to the design thickness. The outer surface of the liner is treated with a bonded inert aggregate to enhance the adhesion of the backfill substrate, which is normally grout or concrete.

Sea inlet at low tide

Channeline GRP lining systems are highly resistant to acids, sulphates and alkalis, making them ideal for use in areas where sewer deterioration has been accelerated by corrosion or oxidization. Channeline systems also have excellent wet abrasion characteristics. Similar to other relining techniques, use of Channeline sewer lining systems will normally result in a reduction of the cross sectional area of the sewer. This reduction is not a cause for concern as the relined sewer of ten experiences an improvement in flow capacity due to the lower K (Colbrooke White) value of the liner. Sufficient durability data has been accumulated to justify design life predictions on the order of 50 to 100 years, assuming the design and installation procedures are properly followed and that advice about exposure to adverse conditions is heeded. In all cases, the design of the renovated structure is computer checked to ensure that it is at least twice the required strength to resist the design traffic loading or external hydraulic loading.