A flow test shall be conducted every 5 years on which classes of standpipes?

• A. Class 1 and 3
• B. Class 2 and 3
• C. Class 1 and 2
• D. Class 2 and 4

Answer: (A)

Flow testing intervals are tied to standpipe use. Standpipes intended for firefighting operations (Class I and Class III) must be tested every five years to confirm the piping, valves, and outlets can still deliver the required water flow to the farthest point at the proper pressure. This verifies hydraulic performance and detects issues like obstructions or valve problems that could hinder a real response. Class II standpipes are for occupant use with 1.5-inch hose connections, so they don’t require the same five-year flow test because their function doesn’t demand the high-volume flow a fire department needs. Class IV isn’t part of this five-year requirement in this context.