In the safety protection system of low-temperature storage tanks, the bursting disc is a very important overpressure protection device, which can directly affect the safe and stable operation of the storage tank. Low-temperature storage tanks are mainly used to store low-temperature media such as liquid nitrogen, liquid oxygen, and liquefied natural gas. These media are prone to increase in pressure in the tank due to changes in ambient temperature and evaporation of the medium during storage, and the low temperature storage tank bursting disc can respond quickly when the pressure exceeds the safe range to prevent vicious accidents such as overpressure explosions.
During the operation of the low-temperature storage tank, if the pressure in the tank is abnormally increased due to damage to the insulation layer, valve failure, etc., when the pressure exceeds the designed pressure bearing capacity of the storage tank, it may cause the storage tank to explode. The low temperature storage tank bursting disc can rupture in time before the pressure reaches the dangerous value, quickly release the high-pressure medium in the tank, reduce the pressure in the tank, prevent explosion accidents, and protect the safety of the storage tank, peripheral equipment, and personnel.
The safety valve is a commonly used overpressure protection device for cryogenic storage tanks, but under certain special circumstances, the safety valve may not work properly. For example, when the phase transition of the low-temperature medium freezes at the disc of the safety valve, it will cause the safety valve to become stuck and fail, or in the case of a sharp increase in pressure, the opening speed of the safety valve may not be able to meet the pressure relief requirements. At this time, the low temperature storage tank bursting disc serves as a backup protection device, which can make up for the protection defects of the safety valve.
The medium temperature in the cryogenic storage tank is extremely low, usually below -100℃. Ordinary overpressure protection devices may experience performance degradation or failure due to low temperature. The low temperature storage tank bursting disc is made of low-temperature resistant materials, and the mechanical properties of the low-temperature environment are fully considered in the structural design, so that the rupture disc can maintain stable working performance under low-temperature conditions, accurately rupture and relieve pressure during overpressure, and meet the special protection needs of low-temperature storage tanks.
The low temperature storage tank bursting disc is in a sealed state under normal working conditions and has good sealing performance, which can effectively prevent leakage of low-temperature media. Compared with some overpressure protection devices that require frequent action, the low temperature storage tank bursting disc has almost no media leakage in the non-operating state, which is conducive to reducing media loss and environmental pollution, while reducing the safety risks caused by media leakage.
In short, the low temperature storage tank bursting disc can achieve reliable pressure relief when the storage tank is overpressure, and it is an important safety device to ensure the safe operation of the low temperature storage tank. In practical applications, the model and specifications of the rupture disc need to be reasonably selected according to the design parameters of the storage tank, the characteristics of the medium and other factors, and regularly inspected and replaced so that the rupture disc is always in an effective working state.
