What does excess flow control refer to?

Excess flow control refers to a safety mechanism designed to mitigate the risks associated with the rupture or failure of a piping system. This involves the use of a device that automatically shuts off the flow of gas or liquid when a predetermined threshold is exceeded, typically due to a rupture or significant leak. This rapid response is crucial as it helps to prevent the potential hazards that could arise from uncontrolled flow, such as fires, explosions, or environmental contamination.

In laboratory settings where flammable gases are used, ensuring the integrity of the piping and promptly responding to any failures is vital for maintaining safety. The implementation of excess flow control devices serves as a critical layer of protection, minimizing the impact of such incidents on personnel and the facility.

While methods to increase flow, monitor pressure levels, or enhance chemical dispensing safety are important in their own right, they do not directly address the immediate safety response to a rupture in the system, which is the primary function of excess flow control. This is why option B accurately represents the concept of excess flow control.