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1.1.3 Remarks for installation of retraction tank
1. Make, if possible, the installation location a double bottom structure.
2. Install, if possible, the tank on the keel where the tank can be most firmly fixed.
3. Install the reinforcement ribs as near as possible to the top of the retraction tank,
allowing space for tightening of nuts and bolts.
250-300 mm
4. Add a doubling plate (a plate added to another to give extra strength or stiffness) at the
location where the retraction tank is welded to the hull bottom. The size of the doubling
plate is normally 1300 mm in diameter so that it may lie across two bottom frames.
5. Use a chisel to inscribe the bow mark on the attachment flange.
1-4
Retraction tank
How to install reinforcement ribs
Reinforcement rib
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