What is a branch line in a standpipe system?

A branch line in a standpipe system refers specifically to the horizontal piping that connects to individual hose connections. This is essential for delivering water from the main standpipe to various locations within a building, enabling firefighters to access water quickly and efficiently when needed. The branch line facilitates the distribution of water to different floors or areas, allowing for effective firefighting efforts.

Understanding the function of branch lines is crucial for anyone managing or operating a standpipe system, as they play a vital role in ensuring that water can reach the specific locations where it is needed during an emergency. The other options do not accurately describe the purpose or functionality of a branch line in this context.