The project, designed by Milanese Metropolitan SpA and produced by soc. coop. Viridia, has been achieved with Renovation VRC + multilayer pipes PE100-RC with an external layer of blue colour in the range from DN32 to DN500 (SDR 11) according to the standard UNI EN 12201-2 and the technical specification PAS 1075 (Type 2). The network, a total length of about 50 km, operating at 10-14 bars, and installed in a standard trench, has allowed a significant reduction of the volume of sand for the bed installation thanks to the partial re-use of the resulting material and all ‘use of innovative manner aimed at ensuring high standards of reliability and durability for a use projected well beyond the duration of the event.
Thanks to this realisation global savings of 723,600 cubic meters of water has been calculated, without taking into account losses along irrigation networks free surface from evaporation especially in summer. Further advantages are the results related to a general decline in the management costs, the wide possibility of adding connections with the service pipes for the new users and to a better and more reliable hydraulic continuity of the network by virtue of the butt welding of pipes and special pieces made entirely of PE100-RC.
The transport of water on the island of Volcanoes (Sicily), where there are numerous cracks in the ground called “sulphurous” characterised by steam and gas emissions, an interesting challenge has been represented in the realisation of a vast network of underground piping systems in the conveyance of waste water to be treated and the transport of sea water to the purification plants for the production of drinking water. Due to the thermal characteristics of the subsoil, the PE100 RT was chosen as the base material from IMPRE.CO.GE buyer. Ltd. and the study of Altieri spa design (Thiene) for the construction of a network of about 10 km of Reno 100 HTS pipes, sizes ranging from DN200 to DN355 (SDR 11) taking into account the various parameters, such as chemical resistance to channelled water, abrasion resistance due to the transport of solid substances and the effect of expansion due to thermal release.
The installation project involved installation of 2600 meters of the aqueduct along a heavily trafficked road, lined with old trees that have a strong impact on the landscape. As a result, this made the selection of laying with open trench subject to heavy constraints and hardly preventable costs, it appeared that the opportunities offered by remote-controlled horizontal drilling technique (TOT) would guarantee all obligations related to the breaking of the soil and permitted optimal solutions for a significant reduction in procurement costs.
The setting of work provided for the primary purpose of the minimum possible number of would launch, the smaller size allowed, obtained with appropriate drilling rig and with a control device of the directionality suitable to guide the progress of the pilot hole with the necessary precision, even in road sections that are not straight.
The speed of advance and the use of the latest equipment has resulted, over which a net saving on production times, also considerable economic savings in the installation, substantially below the average of similar projects with open air excavations.