Basic characteristics, technical data and the applicability
• very light material
• simple and easy way of both transport and manipulation
• fast and cheap assembling
• pipe connections are resistant to water and other type of fluids
• they are resistant to corrosion in alkaline, acid or aggressive environment
• they are fine electrical insulator, and also resistant to mechanical impact
• guaranteed life time of more than 50 years
• practically no costs of pipeline maintenance
• connection with muffs and gaskets made of EPDM or rubber (EN 681)
Application and static recomendation
What pipe series should be used depends on location, ground quality and type of foundation, other various conditions, etc.Pipe series S-20 and S-16 are used in normal conditions, i.e. for normal type of ground, trenches, burial methods and ground compression. Pipe series S-25 are laid in terrains with extremely incoherent material. Deformation of the cross section is checked after one to three months from laying of pipeline. With pipe series S-20 and S-16 deformation cannot be higher than 5% of outer pipe diameter, while the maximum deformation after two years cannot be higher than 10% of diameter. With pipe series S-25, after one to three months from laying of pipeline, maximum deformation will not be higher than 5%, while deformation after 2 years is allowed to be up to 8%.
Laying of sewerage pipes and fittings is allowed without any specific static evidence, and in accordance with the following conditions:
• Bellow traffic surfaces with traffic loading up to 30 tons, minimum covering layer should be 1,5 m.
• Bellow non-traffic surfaces or surfaces which are temporarily exposed to light vehicle traffic, minimum covering layer should be 0,8m.
• While laying the pipeline bellow the buildings, covering layer above the pipe socket must be at least 150mm.
• Protection pipes should be used if the loading from the mounted construction parts cannot be avoided.
• While laying the pipeline in the trenches with minimum width, covering layer must not be higher than 6m; on the other hand, while laying the pipeline below the protective dam and in wide trenches, covering layer should not be higher than 4m.
• Filling soil should have the following approximate characteristics: 8≤20,5KN/m2 8≤22,50 (angleø)
• Laying the pipeline in the area with ground water is allowed only if the removal of the filling material is prevented. Removal is prevented by laying the pipeline in the filter layer made of gravel or concrete.
• If not acting completely in accordance with these norms it is necessary to calculate the pipe carrying ability, while standard conditions of filling and ground compression should be provided (DIN 4033, EN ); this means that in the pipeline zone, from the bottom of the trench up to at least 30cm above the vertex of the pipe the following ground compression values should be achieved:
• 97% density of un shoveled soil for binding ground.
• 95% density of unshoveled soil for binding ground. All values of ground compression should be
proven during handling.
• Pipeline zone (from the bottom of the trench up to at least 30cm above the vertex of the pipe) is filled with material which does not contain stones and at the same time can be compressed. Filling material, which will be in direct contact with the pipe, can be taken from the ground pile came from shoveled trench, which should be previously cleared from large pieces. Ground compression around the pipe can be done manually or by using hydraulic tools. Each time material is filled only up to vertex of the pipe while the ground compression is being done sidewise, never in the zone occupied by the pipe. Filling material is being compressed until well sidewise support of the sewerage trench is provided. Material is being filled above the vertex of the pipe in layers, in a way that the higher layers are compressing the lower ones.