Compressed air storage tanks (air receivers) are critical components of compressed air systems, primarily used to dampen pressure fluctuations, store compressed air, and provide preliminary moisture separation. Properly setting and selecting the tank’s pressure parameters is essential for ensuring system safety and enhancing operational efficiency.
Common working pressure ranges
The operating pressure of compressed-air storage tanks is typically determined based on the air compressor’s discharge pressure and the requirements of the end-use equipment. In industrial applications, the commonly encountered pressure ratings include the following:
- Low-pressure system: Work stress typically occurs in 0.4MPa To 0.6MPa Between them, it is suitable for standard pneumatic tools or blow-off operations with low-pressure requirements.
- Medium-pressure system: Most of the work pressure lies in 0.8MPa To 1.25MPa Within this range, which is currently the most commonly used pressure range in most general industrial manufacturing and automated production lines.
- High-pressure system: Work pressure is at 1.6MPa To 3.0MPa Even higher, primarily for specific process requirements, such as injection blow molding, laser cutting, or specialized chemical processes.
The relationship between design pressure and working pressure
When selecting and using compressed air storage tanks, it is essential to distinguish…Work stressandDesign pressureWorking pressure is the actual pressure during normal system operation, while design pressure is the maximum allowable pressure that the storage tank can withstand during manufacturing.
To ensure safety, the design pressure of a storage tank must exceed its maximum operating pressure. Typically, the design pressure is set to approximately 1.1 times the operating pressure, or an additional increment is added to the operating pressure. 0.1MPa To 0.2MPa the safety margin. This design can effectively handle any transient pressure pulses or overpressure events that may occur within the system.
How to Select the Appropriate Storage Tank Pressure
When determining the pressure parameters of the storage tank, it is necessary to comprehensively consider the compatibility of the entire compressed air system.
- Matching the air compressor discharge pressureThe design working pressure of the storage tank shall be greater than or equal to the compressor’s maximum discharge pressure, so as to prevent overpressure in the tank when the compressor is operating at full load.
- Consider pipeline network pressure losses: Gases experience a pressure drop during pipeline transportation. If the terminal equipment requires 0.7MPa To account for pipeline losses, the pressure settings of the air compressor and the storage tank are typically set slightly higher than this value.
- Assessing gas consumption fluctuationsIf the workshop has equipment that requires high instantaneous air consumption, appropriately increasing the system’s overall pressure and expanding the storage tank capacity can effectively mitigate pressure drops.
Pressure Safety and Routine Maintenance
Pressure vessels are classified as special equipment, and stringent pressure management is the cornerstone of preventing safety accidents.
- Safety valve verificationThe set pressure of the safety valve shall be within the design pressure of the storage tank, and it shall be subjected to regular professional calibration to ensure automatic relief in the event of overpressure.
- Pressure gauge monitoringEquipped with a pressure gauge that meets accuracy requirements, the pressure readings must be closely monitored during routine inspections to ensure they remain within the normal operating range.
- Overpressure operation is strictly prohibited.Do not, in pursuit of higher terminal gas pressure, arbitrarily increase the air compressor’s discharge pressure, as this can leave the storage tank operating for extended periods at an unsafe overpressure condition or close to its design pressure.
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