What is the primary function of a vapor recovery unit (VRU)?

The primary function of a vapor recovery unit (VRU) is to separate and compress vapors for recovery. This process is crucial in the management of volatile organic compounds (VOCs) that can be emitted during fuel storage and transfer operations. By capturing vapors that would otherwise escape into the atmosphere, the VRU plays a significant role in reducing air pollution and improving air quality.

Furthermore, the recovered vapors can often be returned to the fuel system, thereby maximizing efficiency and minimizing waste. This not only has environmental benefits but can also lead to economic advantages for operators in terms of fuel recovery and compliance with environmental regulations.

In this context, other choices do not accurately represent the function of a VRU: monitoring fuel levels involves tracking the amount of fuel in storage tanks; filtering contaminants focuses on the cleanliness and quality of the fuel rather than vapor recovery; and regulating temperature pertains to the physical state of the fuel rather than the management of vapors. Thus, identifying the separation and compression of vapors as the key process highlights the VRU's role in both operational efficiency and environmental protection.