SewerMAX
SewerMAX® is a cost-effective sewer pipe system suitable for gravity trunk sewer mains. Manufactured from polypropylene, SewerMAX® pipes are highly resistant to chemical attack which can be common in sewerage and industrial wastewater pipelines. The material is also resistant in aggressive ground conditions, such as acid sulphate soils or saline ground waters.
Material Properties
| Property | Value & Unit |
| Density | 900 kg/m³ |
| Design Stress | 17.5 MPa |
| Ultimate Tensile Strength | 28.0 MPa |
| Ring Bending Modulus | 1300 MPa |
| Tensile Modulus | 3000 MPa |
| Poisson’s Ratio | 0.45 |
| Property | Value & Unit |
| Max Continuous Service Temperature | 50°C |
| Specific Heat | 1045 J/kg.K |
| Thermal Conductivity | 0.138 – 0.150 W/m.K |
| Coefficient of Thermal Expansion | 7 x 10-5 / °C |
| Vicat Softening Temperature | >79°C |
Polypropylene is inherently resistant to a wide range of chemicals such as acids, alkalis, salts, wetting agents and alcohols. It is however attacked by oxidising acids such as fuming nitric acid or hot concentrated sulphuric acid, neither of which should be encountered in a drain. Polypropylene is swollen and softened by halogenated solvents (for example, trichlorethylene) and hydro-carbon solvents such as xylene and benzene. However, the effect is not immediate and the occasional contact with solvents such as petrol or diesel is acceptable for PP pipes used for drainage and sewerage applications.
SBR seals are also resistant to a wide range of chemicals such as salt solutions, alkalis, glycols and some alcohols. SBR is swollen by a number of organic solvents, however, the seals are encapsu-lated in the pipe profile and to a large extent, isolated from the contents of the pipe. As only a small part of the seal surface is in contact with liquid in the pipeline, any occasional spillages or illegal dumping of chemicals should have a minimal effect.