What are some common misconceptions about handling pressure vessel overpressure emergencies?

1. Directly depressurizing without shutting off the pressure source: If the inlet valve is not closed first during an overpressure event, continued pressure input will render depressurization ineffective and may trigger a secondary explosion. The correct procedure is to immediately shut off the pressure source and then depressurize through a safety valve or vent valve.

2. Operating quick-opening doors under pressure: Forcibly opening quick-opening doors before the container is fully depressurized, or increasing pressure before they are fully closed, can easily lead to an explosion. It is essential to ensure that the pressure is zero and the end caps are fully locked.

3. Ignoring the characteristics of the medium: For toxic or flammable media (such as liquid ammonia or liquefied petroleum gas), failure to take isolation measures after overpressure may lead to poisoning or a secondary explosion. Personnel evacuation should be prioritized, and explosion-proof ventilation should be activated.

4. Relying on a single safety device: Relying solely on pressure gauges or safety valves may fail due to instrument malfunction. Interlocking devices should be calibrated regularly, and a "safety operation tagging system" should be used for double confirmation.

5. Confusion between overtemperature and overpressure: Long-term operation at excessive temperatures will accelerate material creep, indirectly leading to strength failure. Temperature and pressure parameters must be monitored simultaneously.