100 Year Service Life Of Polypropylene and Polyethylene Gravity Sewer Pipes
Polypropylene and polyethylene (collectively known as polyolefin) sewer pipes have been widely used for over 40 years and have an established track record for reliability, integrity and trouble free service. However their predicted overall life expectancy has been discussed for many years without a definitive answer becoming available. Following the conclusion of a major two year project co ordinated by TEPPFA in conjunction with LyondellBasell, Borealis and TGM (Austria) that situation can now be changed and: Designers, owners and operators can now be confident that polyolefin sewer systems will have an in-service life of at least one hundred years when materials, products and installation practices meet the appropriate requirements.

The outcome of this project is vitally important for material suppliers, pipe manufacturers and the designers and operators of sewer systems. Allowing polyolefin sewer pipes to continue to be specified with increased confidence in their asset life.

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Lifetime Polyolefin Sewers Leaflet
Summary Technical Report - December 2014
Full Technical Report - December 2016


A Designer’s Guide to Plastic Sewer Pipe Stiffness Classes

Plastic sewer pipes are manufactured in a range of stiffness classes to allow designers to develop the optimum solution for different site conditions. This TEPPFA guide aims to provide designers with useful information regarding the classes available, their characteristics and performance in order to assist with the selection of the appropriate stiffness class for a specific project.

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TEPPFA Technical guidance document


Technical study regarding the design of thermoplastic pipe systems

In 1999, a key technical study was concluded regarding the design of thermoplastic pipe systems. This project resulted in a much better understanding of the flexible behaviour of plastic pipes and their installation aspects. A design graph was developed, predicting the deflection of pipes in practice. 

Sponsored by TEPPFA and PlasticsEurope, the project team consulted a wide range of industry experts from across the sector. Leading professors throughout Europe were given the possibility to check their calculations for pipe installation. A steering committee from industry was also set up to oversee and support the work in whatever shape and whatever form that was needed. 

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Design Parameters 


SMP Study - Flexible pipes perform better

Antiquated sewer networks in Europe are being sadly neglected. They leak and they lack performance. But how to persuade engineers that these symptoms are caused by non plastic pipes? The Civils Group is convinced that it is now has the diagnosis and more importantly the cure!

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SMP Study continued
Executive Summary
Full Report



TEPPFA has produced a brochure to advise maintenance contractors and the market on the subject of jetting. Industry has taken up successfully the creation of a guideline. All types of gravity drain and sewer systems require a regular cleaning regime to ensure top performance. Plastic sewer pipes are no exception although their maintenance requires only minimal attention. 

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Jetting Brochure 


PVC Sewer Pipes - Longer Lifelines for Sustainable Headlines

Signs of our old age may be obvious. But appearances can be deceptive. So how can we trust such signs on face value? A recent Dutch scientific study of PVC sewer pipes proves that age is more than just mind over matter. Our environmental focus could change forever.

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Several significant studies regarding the predicted lifetime of plastic pipes have been carried out. A report published in The Netherlands officially confirmed in 2006 that the life span of existing PVC pipes when installed according to the correct conditions is more than 100 years. A similar study has been published regarding the durability of PE pipes and there are other technical references. 

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Lifetime of PVC pipes 1
Lifetime of PVC pipes 2
Lifetime of PVC pipes 3
Lifetime of PVC pipes 4
Lifetime of PE pipes 1
Lifetime of PE pipes 2


Clay Versus Plastics

Some rather inconsistent information is sometimes disseminated about the nature of non-plastic pipes and the nature of plastic pipe systems. TEPPFA has a few convincing arguments of its own that it would like to share… Read the real story regarding durability, diversity, hydraulics and a lot more characteristics.

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Holding Statement Clay versus Plastics 


Recommended Installation

Installation is an important factor for long lasting performance. TEPPFA is preparing an installation guide for plastic sewer pipes. The guide is being developed in two stages: firstly a leaflet explaining briefly good and bad workmanship in the trench and secondly, a small booklet to serve as an additional guide with background information. 

The aim is to communicate the correct and recognised installation methods for the performance required from plastic sewer pipe systems.

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Guide for installation 


Plastic Manholes

Plastic manholes and inspection chambers have been applied in sewer networks for the last twenty years. The benefits of plastic manholes and inspection chambers are widely appreciated. In addition to their obviously easy handling, transport and long life advantages, plastic chambers are a lot more resistant to the corrosive gases and products caused by our waste products as they flow through the underground sewer network.

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FAQ Manholes