The purpose of ultrasonic testing of pipes is to find various defects in the manufacturing process of pipes. PP pipes avoid putting pipes with dangerous defects into use, and the possible defects (such as fatigue cracks) of pipes in service can also be detected by sample testing. Carry out quality control. According to the actual situation of the site, draw the installation direction of the PP pipeline at the construction site according to the construction drawings, and reasonably determine the installation distance of the pipeline supports and hangers and the actual location of the site with reference to the specifications, and draw a simple and large installation and connection diagram of the pipeline to facilitate the next process. conduct.
Due to the large expansion coefficient of the PP pipeline, thermal compensation should be considered during installation, generally based on natural compensation, such as the use of square expansion joints. When the PP pipe is laid overhead, the pipe should be supported by a pipe support, and the pipe support can be made of angle steel, half-section steel pipe and other materials, so that the reinforced polypropylene can be freely stretched on the pipe support. During the elastic-plastic bending process of the pipe, the outer material of the pipe is elongated and deformed under the action of tangential tensile stress. According to the production experience of the cooperative enterprise for more than ten years and the author’s experiments, it is proved that the extension and deformation of the outer side of the pipe exceeds a certain value.
The pp pipe used for drainage pipes must be impermeable to prevent sewage from seeping out or groundwater infiltrating, and polluting the ground, sewer or corroding other pipelines and building foundations. The inner wall of the drain pipe should be smooth and lubricated to minimize the resistance to water flow. For the requirements of the pipes, the materials of the drainage pipes must meet the requirements to ensure the normal drainage function. If you touch it coarse particles may be mixed with other impurities. The PP pipe is mixed with impurities in raw materials such as recycled plastic, which will emit black smoke and have a pungent smell; good materials will not emit black smoke and peculiar smell after burning, but the molten liquid after burning is clean.
