One minute to understand the selection of high-pressure pipe fittings and accessories materials
Release time:
Sep 14,2022
All high-purity gas from high-pressure fittings needs to be piped to the point of use. In order to meet the gas quality requirements of the instrument, under the condition of a certain gas export index, more attention should be paid to the material selection and construction quality of the system's high-pressure pipe fittings. In addition to depending on the accuracy of the gas production or purification equipment, it is also greatly affected by many factors in the pipeline system. Therefore, the selection of high-pressure pipe fittings should comply with the relevant industry principles, and indicate the high-pressure pipe and pipe material.
Features of high pressure pipe fittings
1. For high-pressure pipe fittings, the main characteristics of pipe materials that affect gas quality are gas permeability, gas outflow rate, adsorption, surface roughness, wear resistance and corrosion resistance.
2. High-pressure pipe fittings are breathable. The phenomenon that gas flows from the high-pressure (or partial pressure) side to the low-pressure (or partial pressure) side through the material is called gas penetration. Because the partial pressure of oxygen and nitrogen in the air is relatively large and the gas molecules are relatively small, the permeability of the pipeline to the gas mainly reflects the permeability of oxygen and nitrogen. There are usually many oxygen permeability tests. Permeability of Different Materials to Oxygen Permeability of Materials to Atmospheric Oxygen (ppm) Stainless Steel Pipe O Copper Pipe O Polypropylene Pipe 1l Polytetrafluoroethylene Hydrocarbon Pipe 12 Ordinary Steel Pipe 203 As can be seen from the table, stainless steel pipe or steel pipe needs to be selected from the perspective of permeability to transport gas with higher ppm level and purity. If an inappropriate pipe material that does not meet the requirements is selected, no matter what purification method is used, it is useless.
3. The deflation rate of high-pressure pipe fittings, as well as some impurities, such as nitrogen, hydrocarbons, etc. In the pipe material formed during the melting of the material. These impurities are slowly released in the process of transporting high-purity gas and contaminate the pipeline. High purity gas, especially impurities, requires high purity gas above ppb. Generally speaking, the degassing rate of low carbon stainless steel pipe is very low.
4. High pressure pipe fittings adsorption, water and other impurities are polar molecules, so strong adsorption. Rubber, plastic, or some materials with rough surfaces can easily absorb moisture and other impurities. Copper has a strong water absorption. The high purity gases transported by these materials are susceptible to contamination. In addition to delivering oxygen at sub-ppm levels, copper tubing is used. Copper pipes and plastic pipes are not used for high-purity gases, and rubber or plastic materials (including polytetrafluoroethylene) are not allowed for gaskets and packings for gas contact.
5. Surface roughness and wear resistance of high pressure pipe fittings,In order to ensure the purity of the conveying gas, the inner surface of the pipeline is required to have a very high smoothness, which can prevent pollutant particles and moisture from staying on the pipe wall during the purification process and being easily blown away. The high-pressure pipe fittings are smooth and wear-resistant, and produce 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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