Presentation of the PVC-U multilayer pipe system
TeraPlast is the first Romanian company that has produced this type of pipe (multilayer) since 2004, using a revolutionary co-extrusion technology at that time. The main feature of the multilayer PVC-U pipes is the wall structure that consists of 3 PVC-U independent layers, thus:
A compact interior layer in compact PVC,
The core, made out of expanded PVC,
An exterior layer in compact PVC.
This results in a PVC-U pipe with mechanical properties similar to those of pipes made with a compact wall, but with a lower specific weight and, implicitly, with a lower cost.
Teraplast produces PVC-U multilayer pipes for exterior buried gravity sewage in accordance with SR EN13476-1, 2 and SF36/2017 standards. The range of diameters is between 110mm and 500mm with ring rigidity SN2 (SDR51), SN4 (SDR41), SN8 (SDR34) and SN12 (SDR30).
The colour is orange RAL8023.
The products are used for gravity household and industrial wastewater sewage outside the building, buried, with depth between 0.8 m and 6 m.
SN2 – in areas without street traffic,
SN4 – street with average traffic load,
SN8, SN12 – medium or heavy load traffic.
The system is completed with a wide range of PVC-U fittings injected in the same dimension range as the PVC-U pipes. Teraplast offers PVC-U fittings both in the SN4 stiffness class and in the SN8 stiffness class. For stiffness class SN2 are used fittings of rigidity class SN4. The physical properties tested on multilayer pipes include also ring flexibility. The test consists in the deformation of up to 30% of the diameter of a pipe sample, and the requirement is that the pipe doesn’t break and returns to its original shape after the removal of the pushing force.
Presentation of the PVC-U compact pipe system
Besides the multilayer PVC-U pipes, TeraPlast also produces PVC-U pipes in the compact wall version. Obviously, in this case the wall structure is no longer of a multilayer type but is a compact structure in PVC-U.
The mechanical properties of this type of pipe are the same as for multilayer pipes but the specific weight is higher. Teraplast produces this type of compact wall PVC-U pipe for exterior buried gravity sewage in accordance with SR EN1401-1 standard.
The range of diameters is similar to that produced for multilayer pipes, respectively between 110mm and 500mm with ring rigidity SN4 (SDR41), SN8 (SDR34).
The colour is orange RAL8023.
The products are used for gravity household and industrial wastewater sewage outside the building, buried, with depth between 0.8 m and 6 m.
SN4 – street with average traffic load,
SN8 – medium or heavy load traffic.
The fittings used in this system are the same fittings that are also used for multilayer pipes, namely from injected PVC-U in the same dimension range as PVC-U pipes. Teraplast offers PVC-U fittings both in the SN4 stiffness class and in the SN8 stiffness class.
The physical properties tested on multilayer pipes include also ring flexibility. The test consists in the deformation of up to 30% of the diameter of a pipe sample, and the requirement is that the pipe doesn’t break and returns to its original shape after the removal of the pushing force.