Overfill prevention, required according to the VOC directive (RL 94/63/EC dated 12/20/1994) is designed according to EN 13922. It prevents tank tucks from being overfilled while bottom loading.
It consists of the elements:
In the tank truck:
On the gantry:
After connecting the controller to the socket of the tank truck the sensors of the overfill prevention are checked for moistening. At the same time, there is equipotential bonding between the tank truck and loading gantry. If no sensor has been moistened with fluid, loading is released. If sensor in the tank truck is moistened, the loading is automatically switched off.
The complete loading island is typically shutoff when this happens, and the loading process is ended. To prevent this from happening, additional pneumatic sensor (PNS) or combination sensors (EuroBISENS) are installed which prevent the loading process by closing the respective foot valve, before switching off the VOC overfill prevention system.
Please find here our brochures for more detailed information: