Rupture discs are also one of the safety relief devices. They are mainly composed of Rupture discs and clamps. When the pressure in the container exceeds the normal working pressure and reaches the calibrated bursting pressure of the bursting disc, the Rupture discs will burst automatically, and the gas in the container will be discharged outward through the bursting disc, thus avoiding major accidents in the container body, but the container will also stop running after the pressure is released.
Application of Rupture discs in pressure vessels:
Compared with safety valves, Rupture discs have a much wider range of applications.
1. In terms of temperature, the applicable range is -253-480℃ or even higher;
2. In terms of pressure, the applicable range is between 7KPa-800MPa;
3. In terms of discharge diameter, the applicable range is φ8-φ1000mm or even larger;
Advantages of Rupture discs:
1. Good sealing performance;
2. Fast pressure relief reaction;
3. Wide application range;
4. The pollutants contained in the medium in the container have little effect on the bursting disc;
Disadvantages of Rupture discs:
1. The bursting disc cannot be reused;
2. The container must stop running after the bursting disc ruptures.
Therefore, Rupture discs are generally used in situations where the possibility of overpressure is small and the installation of valve-type safety valves cannot guarantee the safe operation of pressure vessels.
Structural forms of Rupture discs:
There are many structural forms of Rupture discs. According to the principle of force damage and its corresponding structure, they can be divided into four categories:
1. Bursting discs damaged by tension (the periphery is compressed, one side is loaded, it is convex, tensile stress is inside the disc, P rises, the middle part breaks, and the pressure is released).
2. Bursting discs damaged by shear (the periphery of the clamp is sheared and damaged, forming a weak link in the structure).
3. Bursting discs damaged by bending (brittle material, the bursting disc hardly produces plastic deformation after being loaded, forming a flat plate bending failure).
4. Bursting discs damaged by instability (good fatigue resistance, convex side bears pressure, compressive stress is generated in the bursting disc, P rises to the critical P, the bursting disc is unstable, flips instantly, and fails to release pressure).
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