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Remarks on installation of retraction tank
• If possible, the installation location should be of double bottom structure.
• If possible, install the tank on the keel, where the tank can be most firmly fixed.
• Install the reinforcement rib as near as possible to the top of the retraction tank, allowing
space for tightening bolts and nuts.
Reinforcement rib
Retraction tank
250–300 mm
Figure 3-4 Installation of reinforcement ribs
• When an attachment flange is used, install reinforcement ribs to the attachment flange.
Attachment flang
e
250–300 mm
Figure 3-5 Attachment flange
• Add a doubling plate where the retraction tank is welded to the hull bottom. The size of the
doubling plate is normally 1200 to 1300 mm in diameter so it lies across two bottom frames.