How does the hydraulic performance of plastic sewer pipes compare with other pipe materials?
Due to their lower roughness coefficient the full bore capacity of plastic sewer pipes can be 30% more than a concrete sewer pipe of the same diameter.
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Why are plastic pipes and fittings being produced and offered in various colours?
Colour coding of underground pipe systems offers an easy and simple way to avoid costly mistakes during installation or repair.
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Are all plastic sewer pipe systems covered by European product standards?
Yes - all types of plastic sewer pipes are covered by EN Standards.
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Are the performance requirements in the EN-standards for structured wall sewer pipes similar to solid wall pipes?
Yes!
Structured wall pipes were developed without compromising on performance.
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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 bedding and surround material is good.
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How does the frequency of joints in plastic sewer pipelines compare with those for other pipe materials?
Clay and concrete pipelines typically have between 2 or 3 times the number of joints as plastic pipelines.
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How does the joint integrity of plastic sewer pipes compare with those for other pipe materials?
Plastic sewer pipes typically have one sixth the number of defective joints compared to rigid pipe materials.
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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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Do plastic sewer pipes require more cover than clay or concrete pipes?
No - Plastic pipes can be buried with similar minimum cover to traditional pipe materials.
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Does the lower weight of plastic pipes compared with concrete and clay pipes reduce installation costs?
Yes!
As the installation costs of a sewer pipe in a trench includes costs of lifting, moving, positioning, cutting, making connections and connecting fittings the lower weight is an advantage.
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What is the maximum size of plastic sewer pipes which can be installed by hand?
Due to the lower weight of plastic sewer pipes, depending on the pipe type and length of the pipe, diameters of up to 500 mm can be installed by hand.
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How does the performance in service of plastic sewer pipe systems compare with other sewer pipe materials?
A research project involving the survey of over 1,800 km of existing sewers concluded that plastic pipes contained on average 6 leakage defects per kilometre compared with 41 leakage defects per kilometre for rigid pipes.
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What data is available regarding the serviceability 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.
Include picture showing the consequence of loss of integrity (leakage) infiltration/exfiltration.
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Does axial deflection of flexible pipes affect leak tightness?
No!
It has been proven that joints on plastic sewer pipes with up to 10% deflection retain leak tightness; pipelines made of rigid materials fracture without any deflection.
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Does angular deflection at joints affect leak tightness?
No!
It has been proven that joints with up to 2 degrees deflection retain leak tightness.
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What is the deflection of plastic sewer pipes due to soil movements and settlement?
In service deflections of pipes with a stiffness class SN 4 or higher in moderate to well compacted soil conditions varies between 1 - 5%.
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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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Can plastics pipelines withstand high pressure water jetting?
The water jetting equipment normally used for sewer maintenance will not attack plastic pipelines.
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Is abrasion a problem with plastic sewer pipes?
Abrasion is so limited ,< 10 mu, it has absolutely no affect on the long term performance of a plastic sewer pipe.
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What jetting pressures should be used on plastic sewer pipes?
A jetting pressure of 120 bar at nozzle is more than adequate to remove all blockages from plastic sewer pipes.
Recommended average draw back speed is between 6 and 12 m/min.
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Is deflection of plastic sewer pipes visible on CCTV?
Yes - CCTV can be used to detect excessive deflection of plastic sewer pipes.
For more precise measurement laser equipment may be used.
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Are plastic pipes in service resistant to high temperatures commonly found in sewer systems?
Yes - Plastic pipes made from PVC, PP or PE are fully resistant against temperatures up to 45ºC.
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How is the chemical resistance of plastic sewer pipes rated compared to pipes based on cementious materials?
Plastic sewer pipes withstand rainwater, industrial and residential waste water without any problems.
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Pipes manufactured from cementious materials can be prone to biogenic , sulphuric acid corrosion does this affect plastic pipes?
There is no danger of biogenic sulphuric acid corrosion to plastic pipes.
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What is the lifetime expectancy of plastics pipelines in relation to the performance?
Plastic pipelines has a lifetime of more than 100 years.
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Can plastic sewer pipes and fitting be re-used ?
Thermoplastics pressure and non-pressure pipelines can be recycled, reprocessed for new plastic sewer pipes and fittings with no effect on quality and performance.
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Can off cuts and recovered pipes be recycled?
Yes - The relevant EN product standards explain how and where recycled pipe can be re-used in production of new pipes.
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