Elevation Pressure Loss / Gain
Standpipe elevation pressure loss or gain shown both as the exact hydrostatic value (0.434 psi/ft) and the fire-ground 5-psi-per-floor rule of thumb, by floors or feet.
Formula and source
Exact P = 0.434 * dH_ft; rule of thumb ~5 psi per floor (assumes 10-ft floors). Climbing is a loss, descending a gain.
Hydrostatic head 0.434 psi/ft (public); fire-ground 5-psi-per-floor approximation per IFSTA Pumping Apparatus Driver/Operator and the NFPA 14 design basis, by name.
Audience
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Posture
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