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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 bolts and nuts.
Figure 3-4 How to install reinforcement ribs
4. When an attachment flange is used, install reinforcement ribs to the attachment flange.
Figure 3-5 Installing reinforcement ribs to the attachment flange
5. Add a doubling plate at the location where the retraction tank is welded to the hull bottom.
The size of the doubling plate is normally 1200 mm to 1300 mm in diameter so that it lies
across two bottom frames.