Briefly describe the advantages of PE pipeline system
Many people may not be able to distinguish between PE water supply pipes and PE gas pipes, thinking that the names are similar and the performance should be similar. In fact, it is not the case. Let’s introduce the difference between the two below: The difference in appearance between PE water supply pipe and PE gas pipe: 1. The color of PE gas pipe is black pipe with yellow stripe or yellow pipe 2. PE The color of the water supply pipe is black pipe with blue stripe or blue pipe three. The mark of the pipe also indicates “gas” (or gas) and “water” (water). PE water supply pipe and PE gas pipe both belong to A kind of PE pipe, PE is polyethylene. Internationally, the material of polyethylene PE pipe is divided into five grades: PE 32, PE 40, PE 63, PE 80, and PE 100. The materials of PE water supply pipes and PE gas pipes are mainly PE80 and PE100.
PE pipe is polyethylene pipe, and its application fields are quite wide. Because of its high strength, high temperature resistance, corrosion resistance, and non-toxicity, it overcomes the shortcomings of galvanized pipes and cast iron pipes that are easy to rust, scale, breed bacteria, and have a short lifespan. It is widely used in the field of water supply pipe manufacturing. As people’s demand for PE pipes increases, a variety of PE pipes are now available on the market. It is undeniable that the market is a mixed bag, and many PE pipes do not meet quality standards. This will not only affect the use of consumers, but also affect the quality of the project, laying hidden dangers for people’s production and life in the future. Therefore, it is very important to learn to identify the quality of PE pipes.
Preventive measures for stuck pipes, pipe holding, pipe deformation, and pipe breakage: A. It is necessary to prevent the under-pressure balance from causing insufficient internal support pressure to shrink the diameter, and also to prevent the formation from softening and shrinkage due to balance water loss, and mud chips cannot be For normal discharge, the pressure of the mud in the hole should be controlled at a value that is relatively balanced with the in-situ stress deep in the hole. Objectively speaking, this is very difficult to do. However, through comprehensive analysis, reasonable design and rigorous construction operations, the degree of imbalance can be reduced as much as possible. The static pressure of mud is mainly controlled by adjusting the mud weight. Generally, it should be slightly less than the weight required to balance the ground pressure to prepare for the superimposition of cyclic dynamic pressure. The orifice holding pit is necessary to maintain pressure balance. Through this, the mud in the hole can be maintained with a certain basic hydrostatic head. B. The use of a strong cement slurry system is the key to controlling easy pore collapse and shrinkage. First, use high-quality slurry clay, which has a large number of exchangeable cations. Water molecules can easily enter between the unit cells. The clay is easy to hydrate and expand, and has good dispersion. Good, it can attract more cations at the same time, so it is “highly active”, has strong ability to accept treatment, and is coated with many hydration films. It is a high-quality water loss reducing pulping clay. In addition, an appropriate amount of water loss reducing agent can be added , such as Na-CMC, nanomethylcellulose, hydrolyzed polyacrylonitrile HPAN, vegetable gum LG, etc. C. Improve the lubricity of mud. As an auxiliary measure to reduce the increase in frictional resistance of drawing pipes caused by holding pipes, improving the lubricity of mud is an important technology for trenchless pipe laying. When the stress of holding pipes is certain, the distance between the pipes and the holes must be reduced. Frictional resistance between walls. The main purpose is to reduce the friction coefficient of the contact surface between the two. An appropriate amount of polypropylene amine can be added to the mud to improve viscosity, reduce water loss and provide lubricity. At construction sites, washing powder can also be used as a lubricant and to break down rock and mud particles.
In short, a complete, clean, and lubricated hole wall is the key to successful pulling. 4.4 In terms of mechanical operation and management, the degree of shrinkage and hole collapse caused by pressure imbalance and water loss and softening increases with time. Therefore, trenchless construction should be completed quickly, compactly, and continuously as a principle, and try to be as early as possible. It is very important to lay the pipeline before laying the pipeline, optimize the design of the on-site operating procedures, and ensure the efficient connection of each process due to creep, sedimentation of mud chips, and loss of mud water in the formation, and the driller’s hand During operation, the pulling and pushing speeds must be controlled; avoid excessive speed causing piston effect and damaging the hole wall. For this reason, spare parts and maintenance preparations should be made before construction. Once the equipment in use breaks down, it should be repaired as soon as possible. High-quality pipes should be selected, paying special attention to their anti-steelness and tensile strength. In short, all aspects of the problem must be considered before drawing the pipe, so that the pipe laying construction can be completed quickly, compactly and continuously during the pipe drawing.
