How does the performance in service of plastic pipe systems compare with other sewer pipe materials?
Plastic sewer pipes have one fifth of the number of defects compared with rigid sewer pipes.
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Does diametric deflection of flexible pipes affect leak tightness?
It has been proven that joints on plastic sewer pipes with up to 10% deflection retain leak tightness.
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Does angular deflection at joints affect leak tightness?
It has been proven that joints with up to 2 degrees deflection retain leak tightness.
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Are plastic pipe systems interchangeable?
All smooth wall pipes are interchangeable. Pipes with external profiles may require adaptors to connect to other types of pipe.
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Are there EN standards for all plastic sewer pipe systems?
Yes - all types of plastic sewer pipes are now covered by EN Standards.
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Is the performance of structured wall sewer pipes as good as solid wall pipes?
Yes - Structured wall pipes and solid wall pipes meet the same basic performance requirements.
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Does pipe stiffness greatly affect the level of deflection?
The pipe stiffness has only limited effect provided the level of compaction of the surrounding soil is good.
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Can plastic sewer pipes be laid with a similar cover to clay and concrete pipes?
Yes - Plastic pipes can be buried with similar minimum cover to traditional pipe materials.
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How deep can plastic sewer pipes be buried?
With normal installation techniques pipes can be buried up to 6 metres deep.
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How can I calculate the likely level of deflection?
Deflection calculations are not normally necessary. A simple graph can be used to predict deflection.
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How does deflection of flexible pipes affect flow capacity?
The effect on capacity is negligible. A 10% deflection represents only a 2,5% reduction in full bore capacity.
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Is abrasion a problem with plastic sewer pipes?
Abrasion is so limited it has absolutely no affect on the performance of a plastic sewer pipe.
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How does the type of backfill material affect the performance of a plastic sewer pipe?
The type of backfill material can influence the extent of deflection of plastic sewer pipes.
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What are the important factors when installing plastic sewer pipes?
Good installation practise and workmanship are the most important factors to assure a good performance of the sewer system.
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Can off-cuts and recovered pipes be recycled?
Yes - The EN standards explain how and where recycled pipe can be re-used in production of new pipes.
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What is the recommended minimum depth of cover for plastic sewer pipes?
Different countries have varying requirements however extensive research with traffic loading on pipes with as little as 800 mm cover has been successfully undertaken.
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What jetting pressures should be used on plastic sewer pipes?
A jetting pressure of 120 bar is more than adequate to remove all blockages from plastic sewer pipes.
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Is deflection of plastic sewer pipes visible on CCTV?
CCTV can only be used to detect excessive deflection of plastic sewer pipes.
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