Hand Book Plastic Pipes 2
- Factors causing damage:
- Physical (frost, heat, UV, butt, pressure, earthquakes…)
EXMP 1: When water is freezing during very low temperatures, it expands. When the pressure cannot release, the pipe containing the frozen water might burst. The trouble is to detect those flaws and cracks caused by frost in time. Wet walls in domestic pipes or a great amount of water loss in outside pipelines can be implications.
- Chemical (substance of liquid, soil composition, pH value, oxygen concentration…)
EXMP 1: Especially industrial- or sewage pipe systems contain crucial chemical impact. Factors which can cause corrosion, aggregation or material wear are among others: fats, oils, acids, lyes, alcoholics, coolant, ketonr or ester.
- Biochemical (biological, molecules, decomposition…)
EXMP 1: The biogenic sulfuric acid corrosion is well know in sewage/drainage systems. Constant maintenance and the removal of aggradations are indispensable processes. The warm temperature of waste water may sustain such corrosion because bacteria can receive energy.
- Biological (animals, roots, biological waste in liquid…)
EXMP 1: As mentioned above, tree roots can destroy pipe systems completely when they find spots to grow onto or when they deform and shift the pipes. Animals such as rodents below ground level may also be a serious thread.
- Mechanical (density, traffic-/soil-pressure, impact, concentrated load…)
EXMP 1: Plugging can be a cause from mechanical wear and end in deformation or burst. Outside pressure such as traffic load or concentrated/puncture load may force a pipe into deformation or even break. Impact, especially at the sealing, result often in cracks or flaws. Internal pressure can cause damage when it is too high but in sewage systems it is rarely the case. In summary, the density of a pipe plays a major rule when the mechanical strength is measured.
- Logical (defective planning, defective building construction, transport…)
Damages do certainly not only happen underground when the system is installed. Some failures are already being done while the process of planning, choosing the correct material, the transport or on the construction site. Every single material may it be fitting, application or pipe must be checked for the requirements and density. Technical test reports help to choose correctly and stay informed about new developments.