A flooding detection panel brings the water level indications from the spaces that matter into one place and acts on them. In the engine room it is a machinery protection and a fire protection function at the same time, because a serious water ingress can extinguish a fire. The panel therefore has to be proven in the condition that matters, which is the loaded, running, and not simply the dry condition.
Key facts and acceptance criteria
The table below lists the values that decide whether the system passes at survey and at maintenance. They come from the maker documentation and the applicable rules, not from general practice, and they are the numbers a surveyor checks.
| Parameter | Requirement | Reference |
|---|---|---|
| Protected spaces | Engine room, shaft tunnel, void spaces and the cargo spaces identified | SOLAS II-1/10 and maker manual |
| Alarm levels | Per the maker and the drainage arrangement | SOLAS II-1/10 |
| Pump interlock | Bilge pump start and the alarm arrangement proven | SOLAS II-1/10 |
| Fire protection | Flooding alarm integrated with the fire arrangements | SOLAS II-2/9 |
| Repeat and test | Panel repeat and test function proved | Maker technical manual |
Regulatory and technical basis
SOLAS Chapter II-1 regulations 10, 12, 30 and 39 for drainage, safety devices and the alarm arrangements, SOLAS Chapter II-2 regulation 9 for the fire protection arrangements, the maker technical manual, and the class survey plan. Engine room flooding detection and the associated pump arrangements are examined at the annual survey.
What the service assessment covers
Seanav Marine provides independent service assessment. The following items define a starting scope for a competent service assessment. The actual test method and acceptance criteria come from the installed equipment documentation and the agreed job scope.
- Level sensor, probe and float switch verification and calibration
- Panel alarm, fault, test and repeat function testing
- Bilge pump interlock and automatic start proving
- Integration with the fire detection and emergency arrangements verification
- As-found calibration record and sensor condition assessment with the vessel PMS
How the work is planned and executed
- Arrangement review. Establish the protected spaces, the alarm levels, the pump arrangement and the maker procedure, and record the as-found configuration.
- Static and sensor checks. Inspect the panel, the sensors, the cabling and the power supplies, and verify the alarm and test functions at the panel.
- Dynamic proving. Simulate the level conditions in the protected spaces and confirm the alarm, the annunciation at every required station, the pump start and the fire protection integration.
- Record. Issue the proving results, the calibration data, the as-found and as-left settings and the outstanding items for the PMS and the class.
Failures that must be distinguished before testing
Do not widen a setpoint or suppress an indication without an engineering assessment. The following failure modes have to be separated from a genuine plant fault before a conclusion is drawn, because they are common, they are visible, and they are usually the cheaper explanation.
- Probes in the engine room that are not cleaned and are covered in oil, so they read high or fail to alarm
- Engine room flood alarm levels that do not account for the bilge suctions, so the alarm sounds only when the pumps are already submerged
- Panels that sound locally in the engine room but do not repeat in the bridge or the accommodation, which is where the response is organised
Equipment and OEM compatibility
Replacement parts and calibration methods must come from the original manufacturer. Seanav Marine works with Kongsberg and ABB flooding detection, Siemens and Emerson marine systems, Endress+Hauser and Danfoss level sensing, and maker-specific engine room flooding detection panels. and sources parts through authorised distributor channels.
Frequently asked questions
Why does flooding detection matter for fire safety as well?
A serious water ingress in the engine room can put out a fire, which sounds harmless but is not: the fire can reignite and the machinery can be lost. The flooding alarm is therefore part of the fire protection arrangement and is treated as a safety device.
Where should the alarm repeat?
At the positions where the response is organised, normally the bridge and the accommodation in addition to the engine room, as the approved arrangement and the vessel procedures require.
How is a flooding alarm tested safely?
By simulating the level at the sensor, using the maker test method, and by confirming the pump start and the annunciation. Actual flooding of a space is never an acceptable test method.
What is the typical service interval?
At the maker and PMS interval, with the alarm and pump interlock functions confirmed at the annual survey. Sensors in oily or contaminated spaces often need cleaning or replacement more often than the panel itself.
Reference framework
These sources explain the relevant system or regulatory context. They do not replace the installed equipment manual or prove the applicability of a particular rule to every vessel.
service@seanav.org · +971 58 568 1197 · Contact the operations desk
About this guide
Published by Seanav Marine. Editorial and source review: . This general service guide is based on the references shown; it is not a signed vessel-specific engineering procedure. Equipment manuals and the responsible technical personnel determine the job requirements.
For technical assessment or a factual correction, contact Seanav Marine with the equipment identity and supporting documents.