Transcript Recent learnings

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This presentation is based on content presented at the Registration of
cranes information session held in July 2014
It is made available for non-commercial use (e.g. toolbox meetings,
OHS discussions) subject to the condition that the PowerPoint file is not
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For resources, information or clarification, please contact:
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www.dmp.wa.gov.au/ResourcesSafety
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Crane incidents in Western Australia –
Recent learnings
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1. Power failure – testing runaways
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Power failure – testing – learnings
• Emergency stop devices do not always sufficiently
simulate conditions under a power failure
• Depending on how the power failed, this can lead to
a voltage “spike”
• Persons performing crane load tests require
adequate testing criteria, and appropriate training to
apply these criteria
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2. Deflection and/or alignment requirements –
learnings
Deflection and/or rail alignment requirements are as
defined by:
• AS 1418.18 section 5.13 for structural deflections
• AS 1418.1 table 7.20.9 for the rail alignment
DMP has identified mine sites with failed rails and rail
fixings, primarily associated with misalignment and
deflection incompatibility.
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3. Wind loading
Uncontrolled movements of cranes due to wind load ‒
why?
• Designs not considering correct loading or factors
specified in AS 1170.2
• Crane manufacturers not understanding design
requirements
• Sites not following the requirements of design
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Wind runaways – requirements
AS 1170.2 , section 2.3 states:
AS 1418.1, section 2.2 states:
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AS 1170.0 table F3
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AS 1170.2 table 3.1
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4. Electrical isolation issues
Regulation 5.29 Isolation of equipment
Each responsible person at a mine must ensure that –
electrical equipment at the mine is provided with full
current isolating devices capable of being secured in
the isolating position
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Typical arrangement of electrical isolation
AS 1418, figure 8.10.2
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Recommended actions for isolation
From AS 1418.1
… safety is frequently introduced by making the stop buttons latch
in the open state, mechanically and by requiring a reset by a start
button to re-establish the contactor independently of the reset of the
stop button contacts.
The system described may be characterised as fail-safe provided
that the probability that the contactor will open when commanded
(its intended service) is within the appropriate ranges….
Call these control switches rather than isolators – otherwise they
need to be lockable
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