Irrigation is one of the main applications of the conveyance of water, both for agriculture and for irrigation of parks and gardens. In Spain, it represents a very important sector, with strong demand for the total volume of water supplied. In recent years it has become particularly important because of the shortage of water. To use reclaimed water for this purpose it is necessary to develop a comprehensive network of reclaimed water.Challenge
Canal de Isabel II began an ambitious plan to reuse the water of Madrid, with an investment of over 200 million euros and which affected more than 30 wastewater treatment plants, in these plants two separate tertiary treatment would be built for the regeneration of part of its effluents. The water will help to water parks and to clean the streets of more than 50 municipalities of the 179 available in the region. In addition, the water will serve to irrigate more than 20 golf courses, and some industries will benefit also from this resource because the price of reclaimed water would be less than the one destined for human consumption.
The goal of the project for this city was to substitute the ductile iron water network by a PVC-O one that could be able to provide a maximum flow of 147.5 l/s solving, at the same time, gravity and pumping deficiencies. Regarding gravity the PVC-O conveyance system should provide a proper service to 21 consumption points distributed in 20 different sections in four axes.Solution
Molecor® reviewed the sizing of the pipes, setting the initial layout to the real irrigation needs and dimensioning, at the same time, the concrete anchors in certain changes of direction. Likewise, Molecor® provided technical assistance during the execution of the works.
The solution provided by the company for the city of Coslada, Madrid, Spain, within the Dpura Project run by the Canal of Isabel II consisted of the implementation of PVC-O networks in three different divisions:
Driving adduction between the pumping station at the outlet of the WWTP treatment and the new reclaimed water tank with a capacity of 5,500 m3. In this part, Molecor® participated with its TOM® PVC-O pipe DN 400 mm PN 16 atm, for a length of 3,450 meters and a vertical drop of 115 meters head.
Branched distribution network by gravity from the reclaimed water tank to 21 consumption points. In this part, the material used was TOM® pipe in DN 110-200-250-315-400 mm and PN 16 atm, for a total length of 7,665 m, with 20 sections distributed in 4 axes and a maximum flow rate network 147.5 l/s.
Branched distribution network drive from the reclaimed water tank to 25 consumption points. In this part, Molecor® provided its TOM® PVC-O pipe in DN 110-160-200-250-315 and 400 mm and PN 16 atm, for a total length of 7,612 m, with 31 sections distributed in 8 axes, and a maximum network flow 121.5 l/s.Result
With the contribution of Molecor® in this part of the project, the maximum fluid speed flow increased with TOM® PVC-O pipes in relation to the previous ductile iron network. For example, in the adduction network, in which DN400 mm pipes are used, this flow speed for PVC-O is 1,276 m/s versus 1,090 l/s of the ductile iron pipes. Likewise, the total load loss accumulated, both in the new adduction system to the reservoir, and in the distribution networks by gravity and pressure, is lower in the case of PVC-O. This lower load loss leads to a remarkable reduction of the energy used for pumping the water throughout the lifetime of the network. In this way a higher efficiency in the use of energy resources is achieved and CO2 emissions to the atmosphere are reduced, thus the contribution to the greenhouse effect is smaller.