202 Open Nozzle
Ultra Fog 202 Open Nozzle — Fire suppression with intelligent activation in machinery spaces and engine rooms.
Inspector Detail
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Common issues
- Nozzle orifice blockage or corrosion from stagnant water or scale in the pipework
- Section (zone) valve or solenoid failing to open on demand
- High-pressure pipe or fitting leakage at connections
- Pressure/flow switch giving false signals
- Corrosion of the nozzle body in an engine room or salt-laden environment
- Faulty detection-to-release interface causing missed or accidental activation
Inspection checklist
- Visual inspection of nozzles for corrosion, blockage or paint overspray
- Inspect high-pressure pipework and fittings for leaks
- Function test of section (zone) valves
- Pump unit start and pressure build-up test
- Functional test of the detection-to-release interface per zone
- Check accumulator/pressure vessel condition if fitted
- Check nozzle deflector plate condition and correct orientation
Service intervals
| Nozzle visual inspection | quarterly to annual per the ship's PMS |
| Full system/discharge function test | annual, typically as a partial/test-zone discharge per maker and class |
| Pump unit test run | monthly |
| High-pressure pipe pressure test | per class survey interval, commonly around every 5 years |
Typical wear limits
| Nozzle orifice condition | any visible pitting, blockage or deformation of the orifice is normally cause for replacement rather than continued service at this pressure class - confirm against Ultra Fog's maintenance manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Replacement open nozzles
- Section (zone) valves
- High-pressure fittings and O-rings
- Pump seal kit
- Pressure/flow switches
Safety
- Stored high-pressure water (100 bar) - injury risk from accidental discharge or line rupture
- Isolate the relevant section before working on any nozzle or valve
- Electrical isolation of the pump unit and detection interface during maintenance
- Slip hazard from test discharge water in the machinery space
Class survey
Fixed water mist fire suppression in machinery spaces is SOLAS Ch.II-2 equipment; class wants annual function/discharge test records, pump capacity and pressure test results, and confirmation the system remains on the approved type list for the protected space.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visually inspect nozzles for blockages; use patented Ultra Fog Nozzle Test Tool to verify piston function without breaking glass bulbs; conduct laboratory testing of nozzles after 10 years service and every 5 years thereafter
Measure discharge pressure against pump characteristic curve; check for unusual operating noise or vibration; verify flow rate capacity (35-50 L/min for P35 model); monitor motor current draw for erratic startup cycles indicating filter blockage
Verify nitrogen pre-pressure setting (typically 90% of operating pressure for 100 bar systems); test accumulator pressure switch alarm function; inspect for visible corrosion, cracks, or leakage in accumulator body; calibrate all pressure gauges annually
Document filter cleanliness condition; measure pressure differential across filters (high differential indicates clogging); perform visual inspection of inlet and outlet filter elements; clean or replace filters after system operation or annually minimum; verify dual 25µm tank filters are present and functional
Pressure test entire piping network at 1.5x maximum working pressure (150 bar minimum for 100 bar systems); inspect water supply tank interior annually for sediment/rust accumulation; flush system annually; drain and refill water tank yearly; verify air passage from nozzles is unobstructed
Type-general inspection and maintenance points for this equipment category — not model-specific.
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