Which standpipe system is described as having water in the piping at all times and relying exclusively on the fire department connection to supply the system demand?

• A. Manual Wet Standpipe System
• B. Semiautomatic Dry Standpipe System
• C. Wet Standpipe System
• D. Dry Standpipe System

Answer: (A)

The key idea is the difference between wet versus dry standpipes and how they get water. A wet standpipe has water in the piping at all times, ready for use. If the system is described as relying exclusively on the fire department connection to supply the demand, that means there isn’t an on-site automatic source (like the building’s own water supply or a pump) feeding the system. A manual wet standpipe fits these points: the pipes are full of water (wet) so there’s no delay to start flow, but firefighters must open the valve at the fire department connection to supply water into the system. The fire department connection is the sole supply path for demand. The other types don’t match both aspects—either they aren’t always filled with water (dry systems) or they rely on building water/pumps rather than exclusively on the FDC (standard wet).