DURVINIL® Double Wall Screen filtering system is composed of two PVC concentric slotted pipes coupled by means of threaded flanges.
The annular space between the two pipes is filled with a filtering material, which may be thermoplastic granules or quartz sand, with granulometry based on the different soil properties.
Double wall DURVINIL® pipes ensure high uniformity and compactness of the filtering layer and simple installion in the borehole.
The filter elements can be easily washed by means of water lances, which allows a long duration of the drainage system.
Possible applications of DURVINIL® DWS pipes:
• drainage of areas subject to slope movements
• drainage systems for heterogeneous sedimentary soils
• recovering of old silted up wells
• permanent drainage systems