How deep can plastic sewer pipes be buried?
With normal installation techniques pipes can be buried up to 6 metres deep.
- In the Teppfa Buried Pipe project, no significant effect of cover depth has been measured up to 2,8m.
- The Teppfa design graphs have been validated for depths of cover of 0,8-6 meter.
- It has been demonstrated that the deflection of flexible plastic pipes is only determined by the settlement of the surrounding soils, and not at all by the vertical soil load.
- Flexible plastics pipes simply follow the movements of the surrounding soil during compaction, short and long term.
- A good compaction of the backfill around the pipe results in a short period of subsequent soil settlement (1-2 months) after which no further deflection will take place.
Want to know more?
Guidance is given in PrCEN/TR15223:
"Validated design parameters of buried thermoplastics piping systems."
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