What is the purpose of a vent tube in a pilot reservoir system for pressure vessels?

In a pilot reservoir system for pressure vessels, the purpose of a vent tube is primarily to equalize pressure between vessels. This is crucial for maintaining stability within the system, as pressure discrepancies can lead to operational hazards or system inefficiencies. The vent tube allows for a controlled pathway for pressure equalization, ensuring that the internal pressure of the pilot reservoir matches that of the surrounding system or another connected vessel.

Equalizing pressure is essential because it helps in regulating the flow of fluids and prevents vacuum conditions or over-pressurization, which can damage equipment or create safety risks. By allowing air or steam to escape or enter the system, the vent tube ensures that pressure levels are balanced, supporting the overall integrity and functionality of the pressure vessel system.

While other components or features of the system may address steam release, water monitoring, or contamination prevention, the vent tube's specific role is fundamentally about pressure equalization.