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Engineering ToolBox
Fire Pump Pipe Sizing
Minimum pipe and component sizes for centrifugal fire pumps per NFPA 20 Table 4.26(a) — select a rated capacity below.
Fire Pump System Schematic
Suction / Discharge
Relief Valve + Relief Line + Circulation Relief
Metering Device
Hose Header + Hose Valves
View full table — NFPA 20 Table 4.26(a)
| GPM | Suction | Discharge | Relief Valve | Relief Line | Circ. Relief | Meter | Hose Header | Hose Valves |
|---|
Sizes in inches (in) · Hose Valves = number of valves × 2½″ size
⚠️ This tool shows minimum reference sizes per NFPA 20 Table 4.26(a) only. The user is responsible for verifying and applying the values correctly per the adopted edition of NFPA 20 and sound engineering judgment. It is not a substitute for fire-pump / piping design expertise.