• The crane location and configuration does not create hazards to the road traffic, e.g.
risk of collision with surrounding obstacles; this may require a specific risk assessment
prior to leaving the crane unattended.
•
Check for leakage and unintended (slow) movement on all load bearing hydraulic
cylinders and winches:
-
Outrigger vertical cylinders
- Boom luffing cylinder(s)
- Jib luffing cylinder, as applicable
- Hoist winch
- Luffing winch, as applicable
NOTE: Slight movement can also be due to a changing oil temperature (e.g.
slight cylinder movement due to sun warming or hydraulic oil cooling).
• Weather forecast shall be obtained in advance for the whole period the crane is erected.
- Changing meteorological conditions, including, but not limited to: wind, ice
accumulation, precipitation, flooding, lightning, etc., should be considered when
determining the location and configuration of a crane when it is to be left
unattended.
- The crane boom should be lowered before wind speeds exceed the permitted
values. This may not be possible depending on job site and crane setup.
- If, due to unforeseen weather conditions, the wind speeds are in excess of the
permitted values with the boom in the up position, the crane should be secured
as best it can and everyone cleared from the area.
- The boom may only be lowered if the expected wind speed during the lowering
process is less than the wind speed allowed during assembly and disassembly
according to the wind speed charts.
Potential hazards from Unattended Crane -
Possible Issue/Risk
The following are examples of possible events that could occur while a crane is left
unattended; these possible risks shall be taken into account:
• Ground failure:
- Ground giving way due to severe rain/ landslides/ washout
- Melting ice under the supports
• Bad weather:
- Storm and wind
- Lightning
- Rain/Flooding
• Crane hydraulic cylinders movement:
T300-1_T500-1_T780
Safety
46 P/N 12261-683
REVISED: January 2015
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