How To Correctly Use Pp-r Pipe Fittings

PP-R pipe is a lot of manufacturers, PP-R tube material is polypropylene (PP-), using different brands of raw materials to produce products that have some differences in performance, coupled with high and low grade production line, the manufacturers to produce PP-R pipe out of a big gap between good and bad quality. When using PP-R pipe, the installation must be tested before, identify quality standards before use. Selection of pipe fittings should first have a quality inspection department of quality inspection report, which used to drinking water in the pipe fittings should have a health inspection department of health performance test reports and test pipes and fittings but also the appearance of quality and diameter and wall thickness, when the test pipe fittings according to GB / T 18742.2? 2002, GB/T18742.3? 2002 national standards such as the major test the following items:

1, the appearance of pipe fittings. The color should be in line pipe, both inside and outside surface should be smooth, flat, no dents, bubbles and other surface defects that affect performance and should not contain visible impurities; pipe surface should be smooth, flat, does not allow any cracks, bubbles, peeling, and obviously impurities, severe contraction shape and color of inequality, decomposition of discoloration and other defects.

2, pipe fittings of non-translucent. Pipe and fitting should be opaque.

3, pipe diameters and wall thickness of pipe. According to GB/T18742.2-2002 national standards, according to size of pipe into S5, S4, S3.2, S2.5, S2 five series. S with nominal pressure tube have corresponding relationship between the pipe size pipe series S, the nominal diameter dn * Nominal wall thickness en, said the main test the nominal pipe diameter, the average diameter and corresponding with the tube wall thickness The socket tube size and the corresponding nominal diameter.

4, pipe fittings physical and mechanical properties and chemical properties. Hydrostatic testing, melt flow rate, hydrostatic testing and thermal stability under the vertical tube retraction rate, Charpy impact test whether the national standard, the test can check the material content of the report and Fushi report .

5, pipe fittings whether the performance of the national standard health requirements. This can check the health inspection department of the pipe and fitting performance of health inspection reports.

6, system suitability. Pipes and fittings connected to the internal pressure should be 8760 hours and by 5000 the two combined thermal cycling test.

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