Tunnel, Sewer & Vent Shaft Liners
Liners can be supplied as for both circular and non-circular applications and can be designed to provide long term, low maintenance corrosion resistant solutions with an expected potential design life in excess of 50-100 years.
General
FRP liners are chemically and structurally engineered with the proper balance of resin and glass to resist a wide range of, acids, alkalis and solvents as well as weathering, spillage and corrosive fumes.In addition to their resistance to corrosion, pitting and scaling, FRP liners are immune to virtually all bacteriological corrosion and growth, will not rust and never require any form of cathodic protection.
RPC produces FRP liners by both "filament winding", "hand lay-up" custom fabrication and/or a combination of filament-wound and hand lay-up to handle a variety of chemicals at temperatures in excess of 80º C.
Advantages
- Excellent corrosion resistance.
- Light weight
- Smooth interior surface
- Translucency
- Durability
- Weather resistance
- Low maintenance
Codes and Standards
Product Specifications and Classifications
| AS2634-1983 | Chemical Plant Equipment made from Glass Fibre Reinforced Plastic (GRP) based on Thermosetting Resins. |
| AS3571-1989 | Glass Filament Reinforced Thermosetting Plastics (GRP) Pipes - Polyester based Water Supply, Sewage and Drainage Applications |
| BS7159-1989 | Design and Construction of Glass Reinforced Plastics (GRP) Piping Systems for Individual Plants or Sites |
| BS5480 | British Standard Specification for Glass Reinforced Plastics (GRP) Pipes, Joints and Fittings for use for Water Supply or Sewerage |
Applications
Applications covered by the FRP pipes and liners are the following:- water distribution both civil and industrial
- sewer systems both urban and industrial
- irrigation networks
- water intakes for cooling water systems
- waste water outfalls to sea
- sealines and rivers crossings
- process lines for industrial plants
- fire fighting networks
- corrosive fluids and vent gas stacks
- wells casing and wells pumps risers
- penstocks
- FGD (flue gas desulphurisation)
- gasoline handling and distribution network
- flue gas stack linings
Jointing Systems
- Butt strap joints
- Flanges and flanged fittings
- Bell and spigot joints
Pipe Lengths
RPC pipe is manufactured in 6.0 metre and 12.0 metre lengths.Physical Properties
- Density (1450-1800)kg/m3
- Coefficient of thermal expansion 8-32 (º C x 10-6)
- Coefficient of Thermal conductivity 0.25 W/mº C
- Flow Coefficient Hazen Williams 150
- Barcol Hardness (35-45)
- Machinability Good
RPC FRP Linings (Sewage)
FRP linings provide a highly corrosion resistant semi-structural membrane, for both new and renovated sewers, to prevent attack of the concrete by aggressive liquids and gasses.FRP linings offer high mechanical strength and integrity combined with excellent corrosion resistance and an exceptionally low frictional flow coefficient to ensure hydraulic performance. Designed as a semi-structural corrosion resistance membrane, FRP pipe liners are manufactured in continuous 360 º segments and joined together using rubber ring bell and spigot joints, avoiding the need for longitudinal seams or insitu welding, whilst providing a proven jointing system for resistance both internal and external pressure.
Due to the continuous nature of the liner FRP liners are designed to provide extremely high levels of mechanical integrity by combining both the advantages of a continuous mechanical keying system, as opposed to individual anchor studs, along with the high mechanical and buckling resistance of a continuously restrained FRP pipe.
This combined restraint system provides excellent resistance to local delamination due to high external ground water pressure.
Advantages/Benefits
- Continuous 360º liner segments provide a gas and water barrier against both internal and external ingress or egress.
- Continuous mechanical keying of the liner into the concrete eliminates potential problems due to individual anchoring.
- FRP sewer liners are highly corrosion resistant to a wide range of acids, alkalis and solvents.
- High mechanical strength properties.
- Smooth internal surface for excellent hydraulic characteristics.
Material Properties
| Property | Unit | MaterialFRP |
| Density | kg/m3 | 1800 |
| Tensile Stress at Yield | N/mm2 | 40 (Axial)400 (Circ) |
| Elongation at break | % | (1 - 3) |
| Barcol Hardness | > 35 | |
| Modulus of Elasticity | N/mm2 | 9000 (Axial)28000 (Circ) |
| Heat Deflection Temperature | ºC | > 90 |
| Coefficient of Expansion | m/m/ºC | 40 x 10 m-6 (Axial)1 x 10 m-6 (Circ) |
Hydraulic Characteristics
Fibreglass pipe, thanks to their smooth inside surface, their resistance to corrosion and to the absence of fouling, have excellent hydraulic characteristics and provide economic advantages over steel and ductile iron pipes.Pressure Loss Calculations
The inner surface of GRP pipe is very smooth, the absolute roughness is approximately 0.002 mm (peak to valley).| PROJECT CASE HISTORIES |