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1.
Objective
The rules in this chapter are to address safety issues of various additional
equipment. Presently, only deck cranes are implemented.
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2. Scope
These requirements apply to power driven lifting gear.
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3. Measures against overload
3.1. Limitations
Deck cranes are to be arranged in such a way to prevent:
- Lifting heavier loads than the crane is constructed for;
- Excessive heeling angles by using unfavourable combinations of boom length
and load.
3.2. Overloading of lifting cable
A lifting gear which is lifting the load with a cable shall be designed so that
the cable cannot be overloaded when the hook is in the innermost position.
When operating onboard lifting gear, the static heeling angle shall not
exceed 10o in the most unfavourable combination of weight and lifting
arm.
3.3. Greatest permitted load
The greatest permitted load shall be marked at a clearly visible place on the
lifting gear. At least three different loads with the corresponding boom lengths
which in the most unfavourable position give the maximum heeling angle (10o)
are to be marked. The marking may in case of automatic load limitation indicate
different permitted loads for different crane positions. Other markings, which
can be misleading, are not permitted.
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4. Documentation of strength
4.1. Strength of crane
For each lifting gear, documentation showing for which load it has been approved
by the authorized testing body shall be provided.
4.2. Strength of fastening
Calculations which prove that the safety factor for metal is at least 5 and for
glass fibre reinforced plastic at least 7 is required for the lifting gear
fastening and the part of the boat which is affected.
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