GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 50 of 84
14.5.5
If used, the hydraulic systems should be ‘fail-safe’ in nature, i.e. in the event of hydraulic power loss,
the tool will continue to transmit normal operating loads.
14.5.6
All relevant test certificates shall be issued by an IACS member (see Section 10.2.1 for IACS details)
or other recognised certification body accepted by GL Noble Denton.
14.5.7
Automatic lifting tools shall have systems in place to control the stress in the lifted item in order to
prevent excessive local stress for sensitive items. Redundant mechanical systems must be in place in
case of power loss.
14.5.8
Operating and monitoring procedures of lifting tools should be adequate to ensure the prevention of all
critical and foreseeable operational errors. External and internal hydraulic lifting tools should have:
a remote monitoring system close to/visible from the crane driver’s cab;
a pressure gauge (or indicator)
in the system, showing when the tool is closed or open
a duplicate pressure gauge (or indicator), as close as safely possible
to the tool to avoid
influences in pressure reading
a secondary method of release in the event
of hydraulic system failure
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