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DEWATERING
DEWATERING means to provide draining and/or pumping facilities to pump out water from spaces which
are located forward of foremost cargo hold in case of detection of water inflow into corresponding spaces.
The system task is to operate and supervise the operation of drainage system by control and position indication (open/close) of relevant butterfly valves in corresponding spaces.
Each compartment (except chain lockers) forward of collision bulkhead --- like void space, dry space or
tank(s) --- is connected to HOWID and has to be equipped with a drainage facility.
Spaces can be connected to an eductor for drainage, tanks are drained by ship's ballast water system.
A mimic & operation panel is provided for dewatering control and supervision.
The mimic panel gives an overview of all valves incorporated in the dewatering process.
Switches are provided to operate each valve of the eductor dewatering system individually.
FOR dewatering of forward tanks the ballast water system is used. The butterfly valve at collision bulkhead acc. to SOLAS regulation II-1/11.4 has to be equipped with a remote operated actuation.
It's controlled and supervised from mimic panel. The valve has to be open before start of tank dewatering
the actual valve position (open/close) is indicated on mimic panel.
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djleekr@nate.com