CCTV's 3.15 party broadcast on the report that “multiple municipal pipelines cut corners and materials, and counterfeiting means are various”, which has aroused widespread concern from all walks of life on the quality of plastic pipe products. After the 3.15 party, the Hebei Provincial Quality Inspection Institute received a large number of inside and outside the province. Sending samples and consulting telephones. In order to quickly resolve the anxiety of sample delivery customers, the hospital has opened up channels specifically to open up more horsepower and carry out inspection work overtime. In addition, provincial market supervision bureaus, water affairs bureaus, pipe production enterprises, construction Units, etc. have come to the hospital to negotiate business and carry out deep-level cooperation. They are required to provide technical support for the production and use of pipes.
Liu Jin, director of the Light Industry Inspection Department of the Hebei Institute of Quality Supervision and Inspection, introduced that recycled materials contain many harmful substances. The sources include plastic waste, defective products, scrap, agricultural plastics, daily-use plastics, medical plastics, etc. The materials that are allowed to be used for direct contact with humans and human ingested products, if used, will cause water pollution and many harmful substances to invade the human body. Moreover, the addition of recycled materials will reduce many of the product's major properties, such as ring stiffness, Hydrostatic, tensile strength, etc.
It is understood that plastic pipes can be divided into water supply pipes, drainage pipes, floor heating pipes, insulated electrical bushings, buried communication plastic pipes, gas pipes, gas drainage pipes, etc., depending on the purpose. Plastic pipes have light weight, construction installation Convenient, high compressive strength, low flow resistance, energy saving, health and safety, long service life, etc., suitable for water supply, drainage, gas applications, etc., has become one of the main pipe materials. Different types of products have different application range , Performance is also different.
Liu Jin introduced that the main indicators of pipe inspection and inspection include the following:
The hydrostatic test mainly tests the performance of a plastic pipe specimen that withstands constant internal water pressure at a constant temperature. In the process of conveying different media, a plastic pipe can withstand a variety of pressure and temperature tests. Failure of the performance of the pipe will cause the pipe Cracks when used.
Ring stiffness refers to the ability of the pipe to withstand external pressure loads. For buried plastic pipes, if the ring stiffness of the pipe is too small, the pipe may undergo excessive deformation or collapse.
Longitudinal retraction rate is the stability of longitudinal plasticity of pipes under heating conditions. It is an indicator of the service life of plastic pipe fittings under different conditions such as sunshine and temperature.
Vicat softening point, This experiment is mainly for the analysis and assessment of the heat resistance of plastic pipe fittings. The higher the temperature in the Vicat heat deformation test, the better the thermal stability of plastic pipe fittings, and vice versa.
Hygienic performance, This indicator mainly detects plastic pipes for water supply, and detects various harmful substances such as heavy metals, plasticizers, heat stabilizers, etc. The indicators that exceed the standards will cause pollution to the water quality that is transmitted, and will have an impact on the environment and human health.