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Guidelines for installation of the retraction tank
• If the keel plate on the inside of the hull is not adequate for installing the retraction
tank, install a secondary keel plate.
• Install the retraction tank where the keel plate and hull frame intersect.
• If there is no suitable location where the hull frame and keel intersect, install suitable
"T" shaped reinforcement ribs, then weld the base of the frame to the reinforcement
ribs and the sides of the reinforcement ribs to the hull walls or other nearby
reinforcement ribs. The reinforcement ribs should be secured in the fore, aft, port
and starboard directions.
• Install the reinforcement ribs as near as possible to the top of the retraction tank,
allowing 150 to 200 mm space for tightening of nuts and bolts.
• Fit a doubling plate (a plate added to another to give extra strength or stiffness) to
the location where the retraction tank is welded to the hull bottom. While it is
recommended that both sides attach to the hull, consult with the installer
regarding length and diameter.
• The thickness for doubling plates and reinforcement ribs is 12 mm minimum.
Ship's framework
Reinforcement ribs
No. of ribs: Minimum 4
Thickness: at least 12 mm
Doubling plate
150-200mm
Stern
Fit doubling plates where the retraction
tank meets the frame and keel.
1. HOW TO INSTALL THE SYSTEM
Reinforcement rib
added along keel line
Keel line
Minimum 12 mm
Bow
1-3
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