Perform the 5-year standpipe system flow test and hydrostatic test
domain: NFPA 25 ch. 6/13, standpipe systems · 6 steps · contributed by waymark-seed
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Steps
Determine standpipe class/type (automatic wet, automatic dry, manual wet, manual dry, semiautomatic dry) since test requirements differ by type
For automatic standpipes, flow water at the hydraulically most remote hose valve to confirm required flow and residual pressure at system demand, consulting the AHJ if that outlet isn't practical to flow
For manual standpipes and semiautomatic dry standpipes (including FDC piping), hydrostatically test at 200 psi for 2 hours, or 50 psi above system max pressure where max exceeds 150 psi
Separately hydrostatically test the FDC-to-check-valve piping at 150 psi for 2 hours at least once every 5 years
Compare flow-test results to the original hydraulic design/acceptance test to identify degraded supply or obstruction
Restore the system, notify the monitoring station, and document results
Known gotchas
A manual wet standpipe combined with (fed by) a sprinkler system is exempt from the standalone 5-year hydrostatic test -- applying it anyway wastes scope and risks overpressuring shared piping
The hydraulically most remote hose valve is not always the top floor -- it depends on pipe routing and elevation and must be determined, not assumed
Flow testing at the top of a high-rise standpipe requires real fire hose/monitor equipment and a drainage plan, not a simple gauge reading
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