Features of polypropylene pipes
Polypropylene, a variety of polymeric materials used for the manufacture of water pipes, heating and other types of intra-house engineering systems.But despite its high performance, which allowed him to successfully replace steel, polypropylene and can not be attributed to materials that will last forever.
Note that under the action of ultraviolet polypropylene destroyed and accelerated aging, external pipework must be designed taking into account this factor. With the passage of time, and even in not very favorable conditions, polypropylene and other pipes made of polymers covered by microcracks shrink.Established 50 years service life may be reduced or increased depending on this, because it is affected by operating temperature and pressure, as well
as their fluctuations, which are not uncommon in district heating and water supply in your home.
Mounting a polypropylene pipe in an apartment or private home, you need to provide them with reliable thermal insulation, as well as make sure that between the design of buildings and pipes was the gap, providing the integrity of pipelines is not only due to their deformation, but also because of the shrinkage orprogress of the building. Do not tightly build into polypropylene pipes in the wall or floor, it is necessary to provide for easy and quick access in emergencies or for preventive maintenance.
reasons strain polypropylene pipes
under high temperatures polypropylene can deform and change its linear dimensions in the one or the other side.In order to somehow compensate for this effect, polymer materials reinforced with metal, but with time, this measure may not help.Thermal expansion compensate polypropylene tubes with special hinges that prevent curving piping.But there is also such fact as shrinkage, which can be from 1 to 3%.This parameter depends on the type of polymeric material, its mode of formation and operation, as well as other factors.
Tests have shown that exposure to a temperature of from 60 to 70 ° C for 1000 hours, the length of the pipe may be reduced by from 0.5 to 1.3%.By increasing the exposure period of 1750 hours, these values range from 1.9 to 2.5%.In those cases when the temperature was increased to 80-100, shrinkage at the same time of exposure ranged from 12 to 15%, significantly higher than the allowable value of 5%.Thus, in order to avoid accidents, the operating temperature in applications where polypropylene pipes are installed, must be maintained at values not exceeding 70 ° C.