What is Stage I vapor recovery responsible for capturing?

Stage I vapor recovery is primarily designed to capture vapors generated during the transfer of fuel from a transport truck to an underground storage tank. This important process helps to prevent volatile organic compounds (VOCs) from escaping into the atmosphere during the refueling operations. By capturing these vapors, Stage I vapor recovery systems minimize air pollution and contribute to environmental protection efforts.

When fuel is transferred from the truck to the storage tank, the liquid fuel creates vapors that expand and can escape into the atmosphere. The Stage I system captures these vapors and redirects them back into the transport vehicle, which then reintegrates them into the fuel system. This reduces emissions and is essential for compliance with environmental regulations aimed at controlling air quality.

While the other choices address important aspects of vapor recovery and fuel management, they pertain to different stages or types of vapor control. The focus of Stage I is specifically during the transfer process, making it a critical component in managing emissions effectively at gas stations and other fuel storage facilities.