1, the correct identification of ppr pipe quality: the real ppr plastic pipe should meet the standard iso / dis 15874.2-1999 << hot and cold water plastic pipe system - pp the second part of the pipe >> pipe should meet the standard iso / dis 15874.2-1999 << hot and cold water with plastic pipe system - p the third part of the pipe >>; pseudo ppr plastic pipe and pipe fittings performance is unable to pass the above criteria. It should be noted that the service life of pseudo-ppr plastic pipe is only 1 to 5 years, while the real ppr plastic pipe life are more than 50 years.
2, pay attention to the overall use of the pipeline coefficient c (that is, the safety factor) to determine:
In general, long-term continuous use temperature ≥ 70 ℃, and may be a long time in the higher temperature operation, optional c = 1.5; optional c = 1.5;
3, for cold water (≤ 40 ℃) system, use p.n1.0 ~ 1.6mpa ppr pipe fittings;
For hot water system selection ≥ pn2.0mpa ppr pipe, pipe fittings.
After considering the above three principles, the sdr of the ppr pipe shall not be greater than the sdr of the pipe, that is, the wall thickness of the pipe shall not be less than the wall thickness of the same size pipe.