How long is the service life of stainless steel bellows

The service life of stainless steel bellows is very long, about 5-7 years, but many people will ask, is there any way to improve the service life of stainless steel bellows and make it last longer?

After the analysis of the stainless steel bellows, the factors affecting the service life of the stainless steel bellows mainly lie in the correct installation of the stainless steel bellows, the control of the working environment, and the manufacturing process.

1. Correct selection and installation of stainless steel bellows: Whether the installation is appropriate is directly related to the service life of the bellows. There are many products on the market. It is necessary to ensure that the same type of bellows is used, and cannot be mixed at will.

2. Application environment: try to prevent long-term exposure to the sun, long-term direct exposure may cause deformation of the bellows, thereby affecting the life.

3. Application skills: Do not use overload. The greater the load, the shorter the service life of the bellows. It must be used within the allowable range of the bellows and must not exceed.

4. Learn to look: look at the craftsmanship, choose high-quality bellows, and check for damage when purchasing.

The normal service life of stainless steel bellows! The bellows we must know is considered to be the three factors in the design of compression strength, stability and fatigue performance. Although there are clear rules for the calculation and evaluation of several aspects of the national standard and the American EJMA standard, but from years of theoretical application and failure analysis of stainless steel bellows, it is found that the stability of the calculation and evaluation methods given in the standard is not comprehensive, and tired. Lifespan is just one fairly thick wire fan.

In addition, sometimes a product that superbly meets the required standard is not eliminated, and some problems will arise in the application of theory. Types such as pre-final displacement state compensation separate stainless steel bellows during the pressure test, out-of-plane instability prone to large-diameter closure types well-compensated separate displacement working position bellows are prone to circumferential instability, small-diameter double-rod type well compensated, The hinge joint compensation joint displacement condition column is prone to instability. The large deformation of stainless steel bellows not only affects the stability, but also provides favorable environmental conditions for stress corrosion.

Stainless steel bellows compensators are widely used in many industries, in addition to good compensation ability, the main reason for high reliability. Its reliability is through the design, manufacture, installation, operation and management, and other links to ensure that any link of the control compensator falls will to life failure. The bellows is considered to be the three elements in the design of compressive strength, stability and fatigue performance. Although the national standard and the American EJMA standard have clear rules for the calculation and evaluation of several aspects, but from years of theoretical application and bellows failure analysis, it is found that the stability of the calculation and evaluation methods given in the standard is not comprehensive, and the fatigue life is also Only give a relatively rough border (average tired lifespan at 103 ~ 105). Sometimes a product that superbly meets the requirements of the standard will have some problems in the application of theory.

The large deformation of stainless steel bellows not only affects the stability, but also provides favorable environmental conditions for stress corrosion. The comprehensive stress compensation amount of the bellows fatigue life of the bellows compensator depends on its fatigue life. The higher the fatigue life, the smaller the single-wave offset of the metal bellows. In order to reduce costs and improve single-wave compensation, some manufacturers make the allowable fatigue life of the bellows compensator too low, which will to a large bending stress of the meridian caused by the displacement of the bellows, and the comprehensive stress is high, which greatly reduces the compensation of the bellows. The stability of the device reduces the use time of the stainless steel bellows.

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