How should a pressure vessel on an air compressor be handled when its service life has expired?

Clearly define the service life of gas storage tanks.

Air compressor‑associated air receivers are classified as stationary pressure vessels, and their safe service life is influenced by material properties, operating conditions, and frequency of use. In standard industry design, the service life of an air receiver is typically set between ten and fifteen years; however, its actual service life is not fixed. Final determination must be based strictly on the manufacturing date indicated on the equipment’s nameplate and on the periodic inspection results issued by a specialized inspection agency. When the inspection report explicitly recommends decommissioning or indicates that the approved service life has been exceeded, operation must be immediately discontinued.

Standard disposal procedures after expiration

Gas storage tanks that have reached their service life or failed inspection must not be used under pressure any further, nor may they be resold without authorization. The compliant disposal procedure shall include the following steps:

• Shut off the energy supply and relieve pressure.: Close the inlet valve, disconnect the power supply, and completely drain any residual gas and condensate from the tank via the drain valve, ensuring that the interior is at atmospheric pressure.
• Professional dismantling and destructive disposal: Entrust the demolition to a qualified entity. To prevent potential safety hazards arising from resale on the secondary market, the tank typically requires irreversible modifications such as cutting or drilling.
• Improve ledger records: Deactivate the container information in the enterprise equipment management records, while retaining the scrapping approval form and disposal photos for future reference.

The Impact of Routine Maintenance on Service Life

Good operational and maintenance practices can effectively slow down the aging of tank vessels. It is recommended to prioritize the implementation of the following measures:

• Open the automatic or manual drain valve at scheduled intervals each day to remove accumulated water at the bottom, thereby preventing electrochemical corrosion on the inner walls.
• Regularly inspect the safety valve and pressure gauge to ensure they are sensitive and functioning properly, and strictly prohibit any unauthorized adjustment of the set‑off pressure.
• Maintain the integrity of the anti-corrosion coating on the tank’s exterior, and promptly sand and repaint any rust spots that are detected.
• In accordance with regulatory requirements, an annual inspection is commissioned each year to a qualified third-party organization, which conducts a comprehensive assessment of wall‑thickness reduction and weld‑joint condition.

Key Considerations for Replacing an Existing Tank

When procuring replacement equipment, verify the gas supply system’s rated working pressure, volumetric parameters, and interface dimensions. Be sure to select products manufactured by enterprises holding the relevant manufacturing licenses, and complete installation notification and supervisory inspection prior to commissioning. Operators must be thoroughly familiar with the new equipment’s start-up/shutdown logic and emergency venting procedures to ensure overall system compatibility and compliance with safety standards.