1. The opacity of the stainless steel cap. The cap should be opaque and the appearance of the cap. The color of the cap should be basically the same, the inner and outer surfaces should be smooth and flat, without dents, bubbles and other surface defects that affect performance, and should not contain visible impurities; the surface of the cap should be smooth and flat, and no cracks, bubbles, peeling and Obvious impurities, severe shrinkage, uneven color, decomposition and discoloration and other defects.
2. Whether the sanitary performance of the stainless steel pipe cap meets the requirements of national standards. This item can check the sanitary performance inspection report of the pipe cap by the sanitary inspection department.
3. The diameter and wall thickness of the stainless steel cap. According to the national standard GB/T18742.2-2002, the caps are divided into five series of S5, S4, S3.2, S2.5 and S2 according to the size. The pipe cap series S has a corresponding correspondence with the nominal pressure. The pipe cap specifications are indicated by the pipe series S, the nominal outer diameter dn* the nominal wall thickness en, and mainly inspect the nominal outer diameter, the average outer diameter of the pipe cap and the corresponding Wall thickness, socket size of pipe cap and corresponding nominal outer diameter.
4. Applicability of stainless steel pipe cap system. After the stainless steel pipe cap is connected with the pipe fitting, it should pass the combined test of 8760 hours internal pressure and 5000 heat cycles. The physical and mechanical properties and chemical properties of the cap. Whether the hydrostatic test, melt mass flow rate, thermal stability test under hydrostatic state, longitudinal shrinkage rate of the pipe cap, and simply supported beam impact test meet the requirements of national standards. This item can check the content of the test report and retest report of the material content.
Post time: 2020-06-23