What is the term for the connection of vent risers aboveground to form a single vent opening?

The correct term for the connection of vent risers aboveground to form a single vent opening is a manifold. In vapor recovery systems, a manifold serves as a collection point where multiple vent lines converge. This configuration is critical in facilitating efficient vapor management, ensuring that vapors can escape safely and effectively without creating blockages or pressure imbalances in the system.

The use of a manifold helps streamline the venting process and can lead to easier maintenance and inspection since it centralizes the venting system. It also creates a more organized pipeline structure, which is important in compliance with regulations regarding vapor recovery systems.

In contrast, flow limiters, pressure regulators, and pressure vacuum vent valves serve different functions within vapor recovery systems. Flow limiters manage the volume of fuel vapors, pressure regulators maintain the pressure within the system, and pressure vacuum vent valves provide a means of venting to regulate pressure changes. Each of these components contributes to the overall functionality and safety of vapor recovery systems but does not specifically describe the connection of multiple vent risers into a single point, which is what a manifold does.