In industrial production, pressure vessels often face the risk of overpressure during operation. Once the overpressure is not released in time, it may cause equipment damage and medium leakage in the factory. Therefore, in order to ensure the safe operation of pressure vessels, bursting disc safety devices have become an important pressure release safety device, and they play an important role in preventing overpressure.
1. Characteristics, types and workings of bursting discs:
The bursting disc device is mainly assembled by components such as bursting discs (or bursting disc assemblies) and clamps (or support rings). When the pressure difference on both sides reaches a preset value under specific temperature conditions, the bursting disc will respond quickly and release the pressure medium by breaking or falling off, thereby preventing the pressure vessel, pipeline or enclosed space from being damaged by overpressure. This device has the characteristics of simple structure and rapid response, and can quickly release pressure under extreme conditions to prevent equipment damage and casualties.
1. Positive arch bursting disc:
Also called tensile metal bursting disc, its characteristic is that its pressure sensitive element is arched and convex. During installation, the concave side of its arch faces the high pressure area of the system, and when it is in motion, it will rupture due to the tensile effect. Positive arch bursting discs are designed in various ways, including ordinary type, slot type, back pressure bracket type, reinforced ring type, cushion type, etc.
2. Reverse arch bursting disc:
Also called compression metal bursting disc, the pressure sensitive element presents a reverse arch shape. When installed, the convex side of its arch faces the high pressure side of the pressure system. During the motion, it will rupture or fall off due to compression instability. Reverse arch bursting discs also have a variety of design types to adapt to different pressure release requirements and operating conditions. Types include ring type, back pressure bracket type, knife holder type, crocodile tooth type, etc.
3. Applicable scenarios of bursting discs:
a) Pressure may rise rapidly.
b) The characteristics of the discharge medium include solid particles, easy precipitation, easy crystallization, easy polymerization, or fluids with high viscosity.
c) When the discharge medium is highly corrosive, resulting in a significant increase in the cost of using a safety valve.
d) The process medium is very expensive or highly toxic, and no leakage is allowed during the working process. It should be used in series with the safety valve;
e) When the working pressure is abnormally low or abnormally high, the selection of safety valves for manufacturing will face greater difficulties and challenges.
f) In a low temperature operating environment, the working characteristics of the safety valve may be affected, which requires special consideration.
g) When the system design requires a larger discharge area to ensure the normal operation of the safety valve.
