SOLAS Fire Pump Capacity, Fire-Main Loss, Farthest-Hydrant Pressure, Nozzle Flow, Emergency Pump & NPSH

Ship Fire Pump, Fire Main, Hydrant Pressure & Emergency Pump Capacity Tool

Turn the vessel's approved fire-pump demand and actual fire-main geometry into a hydraulic operating screen. Check minimum pump count and per-pump capacity, farthest-hydrant residual pressure, fire-main velocity and pressure loss, nozzle flow, required pump discharge pressure, emergency-pump capacity and pressure, and in Advanced mode build the route segment by segment, test NPSH and suction conditions, and verify the independence and readiness chain.

Data type
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Need much more depth? Click Advanced above. Add a full pipe-route register, hose and nozzle detail, pump power, NPSH, emergency-pump independence, container-monitor context and readiness checks.

Ship & Statutory Basis

Use the total required main fire-pump capacity from the vessel's approved statutory or class calculation. The calculator does not recreate the bilge-pump derivation behind that approved value.

m³/h. Use the approved vessel-specific requirement.

Main Fire Pump & Farthest Hydrant

m³/h per required pump.
bar(g) at the relevant design flow.
m. Use hydraulic equivalent length for the Simple screen.
mm.
m. Negative values reduce static head.

Emergency Fire Pump Candidate

m³/h.
bar(g) at its required fire-fighting flow.

Hydraulic Calculation Basis

kg/m³.
m³/h. Leave 0 to use the statutory screening flow derived by this tool.
m from hydrant to nozzle.
mm.

Advanced Fire-Main Route Register

Build the hydraulic path from the operating fire pump discharge to the most unfavorable hydrant. Flow share allows a branch segment to carry less than the total fire-main design flow.

Segment Length m ID mm Darcy f Minor K Elevation m Flow share %

Main Fire-Pump Package

%.
kW.
bar(g). User-entered approved system limit for overpressure screening.

Emergency Pump Applicability, Suction & Power

Used only for the SOLAS alternative-water-supply applicability screen.
%.
kW.
m at the governing service condition.
m at emergency design flow.
% above NPSHr. Project / OEM criterion, not a universal SOLAS percentage.
m above effective water level for operational screening.
bar at emergency design flow.

Independence & Operational Readiness

Fire-system screening only: this tool does not replace the vessel's approved SOLAS / class fire-pump capacity calculation, pump curve, fire-main hydraulic model, hydrant flow test, emergency-power study, suction / sea-chest analysis, fixed water-based extinguishing-system calculation or fire-control plan. Special cargoes, dangerous goods, container-deck monitors, water-spray systems, flag requirements and class notations can create higher demands.
Reference basis: SOLAS II-2/10 requires fire pumps, fire mains, hydrants and hoses, establishes the minimum hydrant pressures, minimum numbers of fire pumps and individual required-pump capacity provisions. For cargo ships, the fire-main diameter need only be sufficient for 140 m³/h under the cited rule, although special arrangements such as container-deck monitor systems can change the governing demand. FSS Code chapter 12 requires a fixed emergency fire pump, where applicable, to be independently driven and sets the emergency-pump capacity floor at 40% of the required total fire-pump capacity with the stated 25 m³/h or 15 m³/h minima. The emergency pump must also maintain the applicable minimum hydrant pressure at its required flow. Suction head and NPSH must be satisfactory in the service conditions addressed by the Convention, FSS Code and applicable unified interpretations. SOLAS Chapter II-2 guidance · FSS Code · ClassNK Part R 2025
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