Airtightness test of liquid carbon dioxide spheres

In accordance with general industrial standards and specifications, low-temperature (liquid) carbon dioxide storage tanks typically require pressure testing (also known as a pneumatic test or leak test) during manufacturing and maintenance to ensure their safety and integrity under actual operating conditions. A gas-tightness test is an important method for checking the leakiness of containers used to store and transport gases; it ensures that such containers do not leak under specified pressures. This is particularly important for liquid gas storage tanks, as liquid carbon dioxide can expand rapidly in the event of a leak, leading to frostbite or other safety hazards. The method for the airtightness test can be selected based on actual conditions; for example: – Pressure (or vacuum) test: By applying an internal pressure higher than the operating pressure (or creating a vacuum), it is possible to check whether there are any leakage points in the storage tank. - Soapy water test: Apply soapy water to the seams of the storage tank; if bubbles form, it indicates a leak. - Helium detection: Detection is carried out using a helium mass spectrometry leak detector; helium molecules are small and can easily penetrate through tiny leaks. Before conducting a gas-tightness test, it is necessary to ensure that the spherical tank and all its components meet the design standards and are installed and assembled in the correct manner. Furthermore, to ensure the safety of personnel, appropriate operating procedures must be followed during testing, usually carried out by professional operators who abide by safety regulations. Whether a gas-tightness test is necessary and how to conduct it shall be determined in accordance with the safety regulations and standards of ** or the region, as well as the specific requirements for the use of the spherical tank. In China, these requirements may be included in industry standards such as GB (**standards**), JB (mechanical industry standards), or SH (petroleum and chemical industry standards). Therefore, it is necessary to consult relevant industry experts when needed or to act in accordance with the latest standards and regulations. .

The CO2 storage tanks specified in NB/T 47001-2023 \"Types and Basic Parameters of Horizontal Steel Liquefied Gas Storage Tanks\" are required to be airtight