What Is Stage III Vapor Recovery and Why It Matters

Gasoline vapor is released every time fuel is delivered, stored or dispensed. Left uncontrolled, it escapes into the air — creating safety risks, polluting the environment and quietly costing money through product loss.

The Three Stages

In the commonly used three-stage model of vapor recovery at Chinese gas stations:

• Stage I — vapor is returned to the tanker truck during underground tank filling.
• Stage II — vapor is returned to the underground tank while a customer refuels their vehicle.
• Stage III — a processing unit treats excess vapor from the underground tanks so that emissions from the site meet the limits of GB 20952.

The Stage III unit is the final safeguard: it collects vapor that the first two stages cannot absorb, processes it on site, and ensures the station’s overall emissions stay within the required limits.

The Stage III unit is the final safeguard: it collects vapor that the first two stages cannot absorb, processes it on site, and ensures the station’s overall emissions stay within the required limits.

为什么重要

For operators, a properly working recovery system means a safer site, cleaner air for customers and neighbours, compliance with environmental requirements, and less fuel lost to evaporation. For a typical high-throughput station, that last point alone can represent a meaningful annual saving.

Vohon manufactures Stage III vapor recovery units designed around these requirements. If you are planning a new station or a retrofit, our engineers can help you size and select the right system.