What is the strength of ordinary pure plastic pipes for water pipes?

Water pipe steel mesh skeleton plastic composite pipe uses steel wire winding mesh as the skeleton reinforcement of polyethylene plastic pipe, with polyethylene (HDPE) as the matrix, and the outer layer of high-density polyethylene is closely connected together, giving it excellent and strong rigidity, so it is more suitable for long-distance water supply, gas transmission and other pipelines in mountainous areas. Since the structure of the two materials, steel and plastic, is composite, there will be no rapid stress that is difficult for plastic pipes to overcome. It has the strength, rigidity, and impact resistance that exceeds that of ordinary pure plastic pipes, and is similar to the low linear expansion coefficient and creep resistance of steel pipes. It is light in weight, uses electric hot melt joints for pipe connections, and has strong axial pressure resistance. 　

Disadvantages: Because the lined steel mesh cannot be hot-melt connected, specific hot-melt joints need to be used to connect, which increases the project budget cost, and the connection between the pipe and the hot-melt joint is easy to break due to its high rigidity. Therefore, it is suitable to be used in mountainous areas and areas with hard soil, and should be avoided in areas with loose soil or high moisture content.

In order to achieve the ideal rust removal effect, the abrasive should be selected according to the hardness of the steel pipe surface, the original rust degree, the required surface roughness, the coating type, etc. For single-layer epoxy, two-layer or three-layer polyethylene coatings, it is easier to achieve the ideal rust removal effect by using a mixed abrasive of steel sand and steel shot. Steel shot has the function of strengthening the steel surface, while steel grit has the function of etching the steel surface. Mixed abrasives of steel grit and steel shot (usually the hardness of steel shot is 40-50 HRC, and the hardness of steel grit is 50-60 HRC can be used on various steel surfaces, and the rust removal effect is very good even on C- and D-level rusted steel surfaces. In order to obtain better uniform cleanliness and roughness distribution, the particle size and proportion design of the abrasive are very important. Too much roughness will easily cause the anti-corrosion layer to become thinner at the peak of the anchor pattern; at the same time, because the anchor pattern is too deep, the anti-corrosion layer will easily form bubbles during the anti-corrosion process, seriously affecting the performance of the anti-corrosion layer.

If the roughness is too small, the adhesion and impact strength of the anti-corrosion layer will decrease. For severe internal pitting corrosion, we cannot rely only on high-intensity impact of large-grained abrasives. We must also rely on small particles to grind away the corrosion products to achieve the cleaning effect. At the same time, reasonable ratio design can not only slow down the wear of the abrasives on the pipes and nozzles (blade), but also greatly improve the utilization rate of the abrasives. Usually, the particle size of steel shot is 0.8~1.3 mm, and the particle size of steel sand is 0.4~1.0 mm, of which 0.5~1.0 mm is the main component. The sand shot ratio is generally 5 to 8. It should be noted that in actual operation, the ideal ratio of steel grit and steel shot in the abrasive is difficult to achieve because the hard and brittle steel grit has a higher breakage rate than the steel shot. For this reason, the mixed abrasives should be continuously sampled and tested during operation, and new abrasives should be added to the rust remover according to the particle size distribution. Moreover, among the new abrasives added, steel grit should account for the majority.