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Wilhelmsen Unitor

HiFoam System (High Expansion Foam Fire Extinguishing System)

Foam Fire System · Fixed Fire Suppression

Technical data from manufacturer or class sources · not yet verified by a person

Wilhelmsen Unitor HiFoam System (High Expansion Foam Fire Extinguishing System) — Total flooding system for machinery spaces Category A, cargo pump rooms, compartments on merchant marine and offshore vessels.

Specifications

Technical data.reference — unverified

Foam TypeHigh Expansion Foam (expansion ratio 200:1 to 1000:1)
Maximum Expansion Ratio940:1 at 20°C (Unitor High Expansion Foam Concentrate 2%)
Concentrate Concentration2% in water
Generator Models AvailableUFG-30 (20 m³/min), UFG-60 (40 m³/min), UFG-90 (60 m³/min)
Operating Pressure5-7 bar at generator
Generator ConstructionStainless steel with DN 20 connection flange
Proportioner ModelsPP 50/20 (500 l/min), PP 80/20 (1200 l/min), PP 100/50 (3100 l/min)
ComplianceSOLAS compliant, Class society approved (IACS)
MaintenanceMinimal maintenance required
Inspection

Inspector Detail

Common issues

  • Foam concentrate degradation or contamination over time, reducing expansion ratio
  • Foam generator fan motor or blade fouling/corrosion
  • Proportioning system (eductor/inline inducer) blockage or miscalibration
  • Piping corrosion, particularly in the foam distribution ducting
  • Release valve or actuator seizure from lack of periodic exercise
  • Nozzle/generator screen fouling reducing foam quality

Inspection checklist

  • Foam concentrate sample analysis (expansion ratio, drainage time, contamination)
  • Foam concentrate tank level and condition
  • Generator fan and motor function test
  • Proportioning device calibration check
  • Piping and valve visual inspection for corrosion or leakage
  • Release station and remote actuation function test
  • Distribution ducting condition in the protected space
  • Foam quality test (expansion ratio and 25% drainage time) during system test
  • Annual full or maker-approved partial discharge test per flag/class requirement

Service intervals

Foam concentrate sample testat least annually - per SOLAS/class requirement
Full foam concentrate replacementtypically around every 10 years, or immediately if a sample fails test - confirm against the manufacturer's guidance
Generator/fan function testmonthly visual check, annual full test
Valve/actuator exercisequarterly or per the vessel's PMS
Piping pressure/leak testat class survey intervals

Typical wear limits

Foam expansion ratioshould stay within the system's design range as tested and witnessed - confirm against the maker's manual and the last class-witnessed test result
25% foam drainage timeshould meet the concentrate manufacturer's specified minimum - confirm against the test certificate

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • foam concentrate (correct approved type/grade only)
  • generator fan motor
  • proportioning device components
  • release valve seals/actuator parts

Safety

  • Total-flooding system - personnel must evacuate the protected space before discharge; alarms and time delay must be verified functional
  • Oxygen displacement risk in the flooded space after discharge - do not enter without a gas-free certificate
  • Stored pressure in release/actuation lines
  • Accidental discharge risk during maintenance - isolate and tag out before working on valves

Class survey

Fixed fire-fighting systems require an annual visual inspection and function test, with foam concentrate sampling per SOLAS/class requirement; class checks maintenance records, concentrate test certificates, and confirms the system matches the approved fire control plan.

Estimated lifetime: Not measured in running hours - foam concentrate typically has a shelf life on the order of 10 years subject to annual sampling, and the mechanical generator/piping system is normally good for the vessel's design life with periodic maintenance

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