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

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.

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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

Ship type

Gross tonnage

Available combined pump flowm³/h at the intended operating condition.

Available pump discharge headm of seawater at the intended operating condition.

Fire-main design flowm³/h through the remote path.

Remote Fire-Main Path

Equivalent pipe lengthm.

Fire-main internal diametermm.

Static rise to remote hydrantm above pump discharge datum.

Hose length per jetm.

Nozzle diametermm.

SOLAS Regulatory & Design Basis

Ship type

Gross tonnage

Approved total required main fire-pump capacitym³/h from the ship's approved SOLAS/bilge-capacity basis.

Approved simultaneous fire-main design flowm³/h used for remote-hydrant pressure-drop check.

Installed main fire pumps

Main pumps operating in pressure check

Static rise to remote hydrantm.

Emergency fire pump applicable?

Approved emergency minimum if FSS formula N/Am³/h. Mainly for passenger ships ≥1000 GT or flag/class-specific basis.

Main Fire-Pump Curve

Rated flow per main pumpm³/h.

Rated headm seawater.

Shutoff headm 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.

Use	Length m	ID mm	Roughness mm	Minor K	Flow %

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.

Use	Hose length m	Hose ID mm	Roughness mm	Minor K	Nozzle mm	Discharge Cd	Nozzle rise m

Emergency Fire Pump

Emergency pump rated flowm³/h.

Emergency pump rated headm seawater.

Emergency pump shutoff head

Extra emergency delivery lengthm before joining the modeled fire-main route.

Extra emergency delivery IDmm.

Extra emergency minor K

NPSH availablem from ship/yard suction calculation.

NPSH requiredm from pump maker at relevant flow.

Hydraulic Properties

Water densitykg/m³.

Kinematic viscositym²/s.

Fire-Main / Pump Checks

Approved SOLAS capacity basis verifiedTotal required fire-pump capacity comes from the ship's approved calculation. Remote hydraulic route verifiedPipe lengths, IDs, fittings and static elevation represent the limiting route. Pump curves verifiedRated/shutoff points are from current maker or test data. Hydrants / hoses / nozzles verifiedActual hose IDs, lengths and nozzle bores are represented. Emergency pump independence verifiedLocation, source of power, sea connection and isolation arrangement satisfy the approved design. NPSH / suction condition verifiedAvailable NPSH exceeds maker requirement in the relevant service condition. Annual flow test reviewedRecent fire-pump pressure/capacity test supports entered performance. Relief / maximum pressure reviewedSystem maximum pressure remains controllable and below piping/hose design limits.

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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