What is required for the two point Phase I vapor recovery system installation?

• A. drop tube
• B. locking block valve
• C. pressure/vacuum vent
• D. vapor recovery adaptor

Answer: (D)

In a two-point Phase I vapor recovery system installation, the inclusion of a vapor recovery adaptor is essential. This adaptor serves a critical role in connecting the vapor recovery line to the transport truck or delivery vehicle during fueling operations. Its primary function is to facilitate the transfer of vapors generated during the fuel dispensing process back into the storage tank, thereby preventing air pollution and minimizing the release of volatile organic compounds (VOCs) into the atmosphere.

The vapor recovery adaptor typically includes features that ensure a secure connection, allowing the vapors to be captured effectively during the transfer process. This mechanism helps in complying with environmental regulations and standards aimed at reducing emissions from fuel handling activities. The design and functionality of the adaptor are tailored to operate effectively within the two-point system, which is characterized by its method of capturing vapors before they can escape into the environment.

In contrast, while other components like drop tubes, locking block valves, and pressure/vacuum vents are important in different contexts and systems, they do not specifically fulfill the role required in the installation of a two-point vapor recovery system. These components may play roles in tank management and safety but are not focused on the connection and vapor recovery necessary for this specific installation.