There are many manufacturers of PPR pipe fittings and pipes. The raw material of PPR pipe fittings and pipes is polypropylene (random copolymerized polypropylene). The products produced by PPR pipe fittings and pipes using different brands of raw materials have certain differences in performance. In addition, the grades of the production lines are different. , There is a big gap between the quality of PPR pipe fittings produced by various manufacturers. When using PPR pipe fittings, they must be inspected before installation, and the PPR pipe fittings can only be used after the quality is qualified. The selected PPR pipe fittings should first have a quality inspection report from the quality inspection department. Among them, the PPR pipe fittings used for drinking water should also have a hygienic performance inspection report from the sanitary inspection department. Diameter and wall thickness, when inspecting PPR pipe fittings, the following items are mainly inspected according to national standards:
1. Appearance of PPR pipe fittings. The color and luster of the PPR pipe fittings should be basically the same, the inner and outer surfaces of the PPR pipe fittings should be smooth and flat, without dents, air bubbles, and other surface defects that affect performance, and the PPR pipe fittings should not contain visible impurities; Defects such as cracks, bubbles, peeling and obvious impurities, severe shrinkage, uneven color, decomposition, and discoloration are allowed.
2. The opacity of PPR pipe fittings. The PPR pipe fittings should be opaque.
3. The diameter and wall thickness of the PPR pipe fittings. According to the national standard GB/T18742.2-2002, the PPR pipe fittings are divided into five series: S5, S4, S3.2, S2.5, and S2 according to the size. The PPR pipe fittings series S has a corresponding relationship with the nominal pressure. The PPR pipe fittings and pipe specifications are represented by the pipe series S, the nominal outer diameter in the nominal wall thickness en, and the PPR pipe fittings are mainly inspected for the nominal outer diameter, average outer diameter, and The corresponding wall thickness of the pipe series, the socket size of the pipe fittings and the corresponding nominal outer diameter.
4. The physical and mechanical properties and chemical properties of PPR pipe fittings. Whether the hydrostatic test of PPR pipe fittings, the melt mass flow rate, the thermal stability test under a hydrostatic state, the longitudinal retraction rate of the pipe, and the impact test of the simply supported beam conform to the national standards, the PPR pipe fittings can be inspected for the inspection of the material. The content of the report and the content of the re-examination report.
5. Whether the sanitary performance of PPR pipe fittings meets the national standards. PPR pipe fittings This item can check the hygienic performance inspection report of PPR pipe fittings and pipes by the sanitary inspection department.
6. Applicability of PPR pipe fittings and pipe systems. After the PPR pipe is connected to the pipe, it should pass two combined tests of 8760 hours of internal pressure and 5000 thermal cycles.
