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| PP-R pipes are a lot of manufacturers, PP-R tube material is polypropylene (PP-R), using different brands of raw materials to produce the products out there are some differences in performance, coupled with high and low-grade production line is different from various manufacturers to produce PP-R pipe out of a big gap between the quality of good or bad. Use of PP-R pipe before installation must be tested, identified quality standards can be used later. Selection of pipe fittings should first have a quality inspection department of the quality inspection report, which used for drinking water pipe fittings should have a health inspection department of health performance test reports and test tubes and pipe fittings but also the appearance of quality and diameter and wall thickness, pipe fittings, when tested according to GB / T 18742.2? 2002, GB/T18742.3? 2002 national standards such as the major test the following items: 1, pipe fittings look and feel. The color should be in line pipe, internal and external surfaces 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 obvious impurities, severe contraction shape and color of the uneven decomposition of defects such as discoloration. 2, pipe fittings of non-translucent. Pipe fittings should not be translucent. 3, pipe diameter and wall thickness of pipe fittings. According to GB/T18742.2-2002 national standards, pipe size divided by S5, S4, S3.2, S2.5, S2 5 series. Pipe Series S and the corresponding nominal pressure there is a corresponding relationship between pipe size pipe series S, the nominal diameter dn * Nominal wall thickness of en, said the main test the nominal pipe diameter, the average diameter and wall thickness and tube series of the corresponding, Pipe Socket size and the corresponding nominal diameter. 4, pipe fittings physical and mechanical properties and chemical properties. Hydrostatic testing, melt flow rate, hydrostatic state thermal stability test, as well as the vertical tube retraction rate, Charpy impact test is in line with national standards require that this material inspection reports can check the contents and re-examination contents of the report. 5, pipe fittings whether the performance of health regulations in line with national standards. This can check the health inspection department of the performance of pipe fittings of health inspection reports. 6, system suitability. Pipe and tube fittings connected to the internal pressure, through 8760 hours and 5000 combination of two thermal cycling tests.
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