JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 38

sewer pipe

Huge sanitation project relies on GRP pipes

Connecting the eastern parts of Ajaccio in Corsica (France) to the Campo Dell’Oro water treatment plant is an ambitious project. To carry it out successfully, the participants – including the Ajaccio metropolitan area (contracting authority), engineering and design company Pozzo di Borgo (project manager), and the Raffalli Company (in charge of the works) – chose a composite sewer pipe system from HOBAS.

he Ajaccio metropolitan area CAPA (Communauté d’Agglomération du Pays Ajaccien), which is located in an area known for its rich, diverse biotope, launched a huge programme in 2010 to reach compliance with the directive on urban waste water treatment. The project combines up-to-date techniques and responsibility in terms of environmental compliance.

waste water treatment plant, such as Alata, the Sanguinaires and the Sarrola Carcopino and Peri plains. Hobas proposed its centrifugally-cast CC-GRP pipelines for the works relating to the transfer of effluents from the eastern parts of Ajaccio to the future Campo Dell’Oro plant.

Abrasion and corrosion resistance
Company’s sewer pipe systems ensure high abrasion and corrosion resistance. The pipes are also mechanically designed to resist loads from backfill, operations, groundwater, or internal/ external pressure over the long term (service life of more than 50 years). Contract awardee Raffalli used the

following this company products (Table 1): The GRP fittings made by Hobas have the same mechanical and structural characteristics as the pipes, ensuring perfect homogeneity of abrasion/corrosion resistance and enhanced leaktightness. These sewer pipes are easily installed and they also meet the need for durable installations.

High-performance GRP pipes
The technical specifications for these GRP sewer pipes are as follows:

A programme worth €46 M
The first phase of the programme involved the construction of the new Campo dell’Oro waste water treatment plant, the renewal and extension of the Sanguinaires waste water treatment plant, and the effluents network to connect the eastern parts of Ajaccio to the Campo dell’Oro plant. This programme worth nearly 46 million euros in investment also provides for connecting the Caldaniccia industrial zone and achieving compliance for the villages or hamlets not connected to the Campo dell’Oro

- The pipes are made of centrifugally-cast Class C glassfibre-reinforced polyester according to the NF T 57200 standard, with uniform outside diameters to allow cutting without Tab. 1: Products used Raffali Cie machining. - The system of Nominal Stiffness Pressure Linear metres Function class class diameter pipes, fittings and manholes that is Pressure PN 6 SN 10 000 Approx. 2300 proposed complies DN 500 Pressure PN 6 SN 10 000 Approx. 3620 with the fitness-forDN 600 purpose requireGravity PN 6 SN 10 000 Approx. 500 DN 600 ments defined in French Fascicule 70 DN 500 PN 6: operating pressure = 2 bar / test pressure = 3.0 bar and the NF EN 476 DN 600 PN 6: operating pressure = 3 bar / test pressure = 4.5 bar

38 jec composites magazine / No77 December 2012

JEC COMPOSITES MAGAZINE - Issue #77 - December 2012

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #77 - December 2012