How should the air supply pipes for the valves connected to units with high vibration levels be arranged?

On units with high vibration levels, flexible hoses should be given priority as the air supply pipes for valves, as rigid stainless steel pipes are prone to fatigue damage due to the vibrations of the unit, which can lead to leaks or jamming. Flexible hoses possess good elasticity and corrosion resistance, which can effectively reduce the impact of unit vibration on the pipelines, thereby extending the service life and improving the efficiency of the valves. At the same time, when designing the gas delivery pipelines, full consideration should be given to the strength and stability of the pipelines, and appropriate materials and specifications should be selected based on the specific application requirements. .

They are usually made of high-strength polymer materials such as polyurethane, polyester, and polyether. Such hoses are usually jointless, which effectively prevents leaks at the connection points, thus ensuring the safety and purity of the medium being transported. At the same time, the inner wall surface of the hose is smooth, offering excellent friction resistance, which prevents the accumulation of solid particles and the growth of bacteria. This hose is typically used to transport media with demanding properties such as corrosiveness, high temperature, and high pressure. Compared to traditional pipes or hoses, seamless solid material hoses have the advantages of a longer service life, as well as better high-temperature resistance, corrosion resistance, pressure resistance, and wear resistance. It should be noted that when using seamless, centralized material hoses, it is necessary to select the appropriate material and specifications based on the actual conditions, and to use and maintain them in strict accordance with the instructions and operating procedures. Furthermore, the hose has a high rate of expansion and contraction; therefore, buffer devices are needed to prevent the hose from rupturing or curling during transportation. Finally, the installation and connection of hoses must also comply with relevant standards and regulations to ensure their safety and reliability

This type of hose is very useful; we’re using it right now

Can PVC be used for the air supply pipeline of the control valve in 4Q9? A: Yes, but stainless steel is recommended for chemical processing projects. In HGT20510, for the piping on the downstream side of the air source ball valve, stainless steel pipes are recommended. Paragraph 8.1.2 of the specifications states that the piping on the downstream side of the air source ball valve can also be made of nylon or PVC pipes. In SHT3020, 6.1.2 For the piping located behind the air supply ball valve and on the downstream side of the air filter pressure regulator, stainless steel pipes or copper pipes with PVC coatings are recommended. In applications where fire protection is required, stainless steel should be used for the instrument air supply pipelines. One can also refer to the specifications regarding the pipes used for transmitting pneumatic signals; according to 12.1.7 of SHT3551, pneumatic signal pipes should be made of copper tubes (cables) with a diameter of φ6mm to φ12mm, stainless steel tubes, or polyethylene or nylon tubes. In SHT3019, 5.1.1 The material for pneumatic signal pipes (including valves and fittings) should preferably be 316 stainless steel pipes, copper pipes with PVC coatings, or plain copper pipes; polyethylene pipes or nylon pipes can also be used. According to 8.3.1 of GB50093, pneumatic signal pipelines should be made of copper pipes, stainless steel pipes, or polyethylene and nylon pipes. According to the explanatory notes in clause 5.8.3 of GB51283-2020, the Fire Protection Code for Engineering Design of Fine Chemical Enterprises, polyethylene pipes resistant to sunlight can be used locally for pneumatic control pipelines. According to 10.2.4 of GBT50892, when the production equipment has anti-static requirements, polyethylene pipes or nylon pipes shall not be used.