In municipal engineering and building water supply and drainage systems, PE carat pipes are widely used because of their corrosion resistance, good flexibility and other advantages. However, many novices often fall into misunderstandings due to lack of experience in the selection process, which not only affects the quality of the project, but also may cause unnecessary cost waste. This article will provide specific avoidance solutions for the five most common selection errors.

Error 1: Ignoring Pressure Grade Matching

Some engineers only focus on the pipe diameter and ignore the pressure parameters, resulting in the risk of pipe explosion during system operation. PE carat pipes are divided into multiple pressure grades such as PN6 and PN10. The safety factor should be selected according to 1.5 times the maximum working pressure of the system. It is recommended to consider the impact of water hammer effect and temperature change on pressure at the same time, and clearly mark the pressure requirements in the drawings.

error two: specification size calculation deviation

common error is to directly select the type according to the nominal diameter, without considering the wall thickness deviation and connector size. The correct way is to measure the actual size of the inner diameter and outer diameter, and reserve 5% -10% of the flow margin. For complex pipe network systems, professional hydraulic calculation software should be used to assist the design to avoid the situation of excessive local resistance.

error three: material certification omission verification

part of the user did not check the product's sanitary license and pressure pipe components manufacturing license. PE carat pipe compliance should have the special equipment manufacturing license issued by the General Administration of Quality Supervision, Inspection and Quarantine, drinking water pipelines also need to obtain water products sanitary approval. It is recommended to require suppliers to provide the latest version of the original certification documents.

Mistake 4: Improper selection of connection method

Mistake use of hot melt connection and mechanical connection mixed scheme, resulting in interface failure. The connection method should be selected according to the construction environment: Hot melt connection should be preferred for buried pipelines, and flange connection should be used for pipe sections that need to be disassembled frequently. Special attention should be paid to the compatibility of different brands of pipe fittings. It is recommended to use the same brand of pipe fittings for the same system.

Mistake 5: Ignoring environmental adaptability factors

Failure to consider the anti-aging properties of materials in special environments. Double-walled pipes containing 2.5% -3% carbon black should be selected in areas with strong ultraviolet rays. The corrosion resistance grade of materials needs to be improved in chemical corrosion environments. For areas with large temperature differences, the coefficient of thermal expansion should be calculated and necessary compensation devices

To avoid these errors, a complete selection checklist needs to be established: first confirm the design parameters (pressure/flow/medium), then check the product certification documents, and finally evaluate the particularity of the construction environment. It is recommended to keep a complete selection calculation book and quality certification documents to provide a basis for later maintenance. Through a systematic selection process, the project risk can be effectively reduced and the service life of the pipeline can be extended.