What type of vapor recovery may be required when a tanker truck delivers fuel into an underground tank?

Stage 1 vapor recovery systems are designed specifically to capture vapors that are displaced during the loading of fuel into underground storage tanks from tanker trucks. When fuel is transferred, the vapor space in the tank fills with vapors that would otherwise escape into the atmosphere. Stage 1 vapor recovery systems contain equipment that captures these vapors to prevent air pollution and reduce the amount of volatile organic compounds (VOCs) released during the fueling process.

This type of vapor recovery is critical because it helps meet environmental regulations and ensures compliance with air quality standards, particularly in areas that are trying to minimize emissions. In contrast, Stage 2 vapor recovery is intended for vehicle refueling at gas stations, focusing on capturing vapors displaced from the vehicle tank during filling. Emissions control recovery and atmospheric discharge recovery are not standard terms or systems used in this context and do not pertain specifically to the delivery process into underground tanks.

Therefore, Stage 1 vapor recovery is required during fuel deliveries to minimize environmental impact and meet regulatory requirements for vapor emissions.