SOLAS II-2/10 • Hydrant Pressure • Darcy-Weisbach Loss • Two Jets • Main Fire Pumps • FSS Code Emergency Fire Pump • NPSH

Marine Fire Pump & Hydrant Pressure Tool SOLAS Flow, Head, Hose & Emergency Fire Pump

Screen a ship fire-main hydraulically from pump head to the most remote hydrant instead of checking pump capacity alone. Simple mode gives a fast residual-pressure and hose/nozzle result. Advanced adds pump curves, multiple fire-main segments, hose/nozzle branches, SOLAS main-pump capacity screens, the FSS Code emergency-pump capacity rule, NPSH, design-flow pressure checks, operating-point analysis and live hydraulic-grade visuals.

Figures represent
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Need pump curves, several pipe sections, emergency-pump sizing or NPSH? Click Advanced above.Simple assumes seawater, one remote fire-main path and two identical hose/nozzle jets. Results update instantly as you type.
PressureRemote hydrant MPa / bar
HydraulicsMain loss + static head
JetEstimated hose/nozzle flow

Ship & Pump

m³/h at the intended operating condition.
m of seawater at the intended operating condition.
m³/h through the remote path.

Remote Fire-Main Path

m.
mm.
m above pump discharge datum.
m.
mm.

SOLAS Regulatory & Design Basis

m³/h from the ship's approved SOLAS/bilge-capacity basis.
m³/h used for remote-hydrant pressure-drop check.
m.
m³/h. Mainly for passenger ships ≥1000 GT or flag/class-specific basis.

Main Fire-Pump Curve

m³/h.
m seawater.
m seawater.

Fire-Main Segment Register

Each active section uses Darcy-Weisbach. “Flow %” is the share of total fire-main flow that passes through that section, allowing branches downstream of the pump to be represented.

UseLength mID mmRoughness mmMinor KFlow %

Remote Hose / Nozzle Register

The live operating-point solver couples pump head, main losses and the selected remote hose/nozzle branches. Add the hydrants/nozzles that are intended to operate together.

UseHose length mHose ID mmRoughness mmMinor KNozzle mmDischarge CdNozzle rise m

Emergency Fire Pump

m³/h.
m seawater.
m before joining the modeled fire-main route.
mm.
m from ship/yard suction calculation.
m from pump maker at relevant flow.

Hydraulic Properties

kg/m³.
m²/s.

Fire-Main / Pump Checks

Engineering / statutory limitation: this tool is a hydraulic and regulatory screening aid, not an approved fire-control-plan calculation. SOLAS applicability, bilge-derived total fire-pump capacity, fire-main design flow, pump separation, tanker arrangements, fixed water systems sharing the fire pump, flag/class interpretations and approved maker curves remain controlling.
Regulatory basis: SOLAS II-2/10 requires minimum hydrant pressures of 0.40 MPa for passenger ships ≥4000 GT, 0.30 MPa for passenger ships below 4000 GT, 0.27 MPa for cargo ships ≥6000 GT and 0.25 MPa for cargo ships below 6000 GT. FSS Code chapter 12 requires an applicable fixed emergency fire pump to be at least 40% of the total required fire-pump capacity and not less than 25 m³/h for passenger ships below 1000 GT and cargo ships ≥2000 GT, or 15 m³/h for cargo ships below 2000 GT, while also maintaining the SOLAS minimum hydrant pressure.
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