Where should external water supply connections to standpipes be made?

• A. At the base of the standpipes.
• B. In the pump room.
• C. On the exterior of the building.
• D. In the stairwell.

Answer: (A)

The essential rule is that external water supply connections to standpipes are made at the base of the standpipe. This location ensures water enters the system at the lowest point, which helps push the water upward through all risers with fewer air pockets and minimal head loss, so the pressure remains effective at all levels of the building. Placing the inlet at the base also keeps the connection accessible from the exterior or pump area, making it straightforward for firefighters to hook up the supply without interfering with interior egress or equipment.

If the connection were higher up or inside a room like the pump room, you’d introduce extra piping length, greater pressure losses, and potential air pockets, which can delay or weaken water delivery to upper floors. Airflow and accessibility concerns in the stairwell or exterior higher on the building would likewise complicate operations during an emergency. So, locating the external water supply at the base of the standpipe provides reliable, rapid, and straightforward access for effective firefighting.