- Ships with more then 36 passengers
- Watertight compartments under the bulkhead deck shell be equipped with flooding detection systems if the volume is superior to the maximum of the following values:
- Volume [m3] > TPC1 of the ship in the maximum subdivision draught, or
- 30 m3
- The flooding detection systems is composed by:
- Sensors – that activate a sign in the presence of water
- Alarms – that produce and audible or visible sign
- Must be installed
- Vertically, as low as possible
- Longitudinally, in compartments forward of the mid-length, at the forward extremity; in compartments aft of midships, at the aft extremity;
- Transversely, close to the mid plan of the compartment, or in alternative, in both sides PS/SB
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