Channeline Structural GRP Lining Panels are manufactured to fully comply with the WRc materials standards for GRP (Guidance note WIS 4-34- 02) and are also manufactured in accordance with BS5480 and ASTM D3262.

Mechanical Properties

At the outset of each project a detailed design analysis is undertaken, taking into account all necessary criteria such as depth of pipe, condition of existing pipe, ground loading, the likely effect of external water etc. to determine the exact requirements for the liner design. Design work is generally undertaken in compliance with the requirements of the latest edition of the WRc manual (other standards may be used) which then establishes the liner thickness.

Channeline Mechanical Properties

Material Flexural Modulus in MPa Bending Stress in MPa Tensile Strength in MPa
  Short Term Long Term Short Term Long Term Short Term Long Term
Channeline 10000 4000 110 60 98 45

Chemical Resistance

The deterioration of a sewer or culvert is often accelerated by corrosive gasses and the oxidization of Hydrogen Sulfide into Sulfuric Acid.

Soft mortar is not always easily identified by CCTV surveys. For Man Entry sewers manual inspection is recommended. Most structural failures in sewers are caused by insufficient tensile capacity and chemical attack will contribute to this reduction in strength.

The resins used by Channeline are highly resistant to sewer gases and most trade effluent. A detailed chemical resistance guide is available from your Channeline Representative.

Barcol Hardness and Abrasion Resistance

The high quality gel coat resins and surface veils used in the manufacture of Channeline panels provide an exceptional degree of resistance to impact and abrasion.

Wet abrasion testing comparisons with other liner methods show impressive and superior results. The Barcol hardness of cured Channeline material is Shore D 30.

Hydraulic Capacity

The hydraulic capacity of a sewer or culvert is dependent on the cross sectional area of the unit and the surface roughness of the sewer or culvert wall. Collapsed and protruding sections of the host pipe wall can greatly reduce the cross sectional area and increase the friction coefficient of the unit, thus dramatically reducing its hydraulic capacity.

A feature common to nearly all sewer and culvert renovation processes is that the internal surface roughness of the existing sewer or culvert is reduced, i.e. improved from a hydraulic point of view. Thus, although there is frequently a loss of cross sectional area associated with the renovation work, this is generally counteracted by the improved flow-carrying characteristics of the upgraded sewer.

Channeline will always provide an improvement to the flow capacity of a lined large diameter pipeline or culvert. Generally, this is in the range of 12% to 25% even though the cross sectional area of the structure has been reduced slightly.

Experience has shown the extremely smooth nature of the Channeline GRP material mitigates the flow/pipe wall friction so that under normal flow conditions pipelines and culverts once lined, are effectively self-cleaning.