Selection of Piping and Accessories Materials for High Pressure Pipeline
Release time:
Jul 02,2021
High pressure pipingAll high-purity, high-clean gases in need to be piped to the point of use (POU). In order to meet the gas quality requirements of the instrument, when the gas outlet index is constant, more attention should be paid to the system.High pressure pipingMaterial selection and construction quality. In addition to depending on the accuracy of the gas production or purification equipment, it is largely affected by many factors in the pipeline system. Therefore, the selection of pipes should comply with the relevant industry principles, and indicateHigh pressure pipingPipe material.
1.High pressure pipingPipe characteristics
For high-purity gas pipelines, the main characteristics of pipeline materials that affect the quality of gas are gas permeability, gas outflow rate, adsorption, surface roughness, wear resistance and corrosion resistance.
2.High pressure pipingBreathability
The phenomenon of gas flowing from the high pressure (or partial pressure) side through the material to the low pressure (or partial pressure) side is called gas permeation. Because the partial pressure of oxygen and nitrogen in the airCompareThe gas molecules are relatively small, so the permeability of the pipe to the gas mainly reflects the permeability of oxygen and nitrogen. General oxygen permeability test more. Permeability of different materials to oxygen Permeation of atmospheric oxygen(ppm) Stainless Steel Pipe O Copper Pipe O Polypropylene Pipe 1l PTFE Pipe 12 Ordinary Steel Pipe 203 As can be seen from the table, for transporting gases with ppm level and higher purity requirements,Stainless steel pipes or steel pipes must be selected from the perspective of air permeability. If we choose the pipe material that does not meet the requirements improperly, then no matter what purification method is used, it will not help.
3.High pressure pipingdeflation rate
There are some impurities in the pipeline materials formed during the material smelting process, such as nitrogen, hydrocarbons, etc., such as nitrogen, hydrocarbons, etc. These impurities will be slowly released during the transportation of high-purity gas and pollute the pipeline. High purity gases, especially impurities needHigh purity gas above ppb. Generally, the degassing rate of low carbon stainless steel pipe is extremely low.
4.High pressure pipingadsorption
Since impurities such as moisture are polar molecules, they have strong adsorption properties. Rubber, plastic, or some rough-surfaced materials easily absorb moisture and other impurities. Copper material has strong water absorption. The delivery of high purity gases with these materials is susceptible to contamination. In addition to conveying lessIn addition to ppm levels of oxygen, copper tubing was also used. High purity gas does not use copper pipe and plastic pipe, gas contact gasket and packing shall not use rubber or plastic materials (including polytetrafluoroethylene).
5.High pressure piping Surface roughness and wear resistance
In order to ensure the purity of the conveying gas, the inner surface of the pipe is required to have a very high finish, which can prevent pollutant particles and moisture from remaining on the pipe wall and is easy to blow away. during the purification process. The pipe is relatively smooth and wear-resistant, and produces less metal particles under high-speed airflow. Stainless steel produces less particles than copper pipes, so stainless steel pipes have better wear resistance than steel pipes.
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