Home' Navy News : August 16th 2012 Contents hydraulic and lube oil filtration
maximise system reliability
Research and field experience has
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the performance and life of equipment.
Installing fine filtration and purification
Improve the reliability and performance
of your hydraulic and lubrication systems
Maintain appropriate system
Extend component and
fluid service life
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August 16, 2012
HUMAN er ror resulting from fatigue is
widely perceived as the cause of numerous
In fact, one of the worst maritime envi-
ronmental disasters in the last century, the
grounding of the Exxon Valdez, was found to
be caused by errors stemming from fatigue.
Another case of hu man er ror brought
about by fatigue was in 2010 when the
Chinese registered bulk carrier Shen Neng I
grou nded on Douglas Shoal, about 50 miles
north of the port of Gladstone, Queensland.
The ship's hull was seriously damaged
and the engine room and six water ballast and
fuel oil tanks were breached, resulting in a
small amount of pollution.
The Australian Transport Safety Bureau
(ATSB) investigation fou nd that the grou nd-
ing occurred because the chief mate did not
alter the ship's cou rse at the designated posi-
tion. His monitoring of the ship's position
was ineffective and his actions were affected
In one of four safety issues identified dur-
ing their investigation, the ATSB found there
was no effective fatigue management system
in place to ensure the bridge watch keepers
were fit to stand a navigational watch after
they had super vised the loading of coal in
Shen Neng I's loading in Gladstone was
the chief mate's first time in charge of load-
ing the ship.
He was unfamiliar with the operation and
reliability of the ship's ballast system and, to
ensure that loading was not delayed, chose to
remain on duty for the majority of the time
the ship was berthed.
Consequently, he only had 2½ hours
sleep in the 38½ hours before the grounding.
Although he had not had adequate rest, he
was per mitted to relieve the second mate.
From when he took over the watch at 1600
to when the ship ran aground, the chief mate
made a succession of errors which were prob-
ably brought about by his lack of sleep.
These er rors resulted in the chief mate
not altering the ship's course when he was
required to and the ship ran aground.
Generally fatigue causes deterioration in
mood, decreased power of judgment and rea-
soning, and slow and inaccurate perfor mance.
Short-ter m physiological or acute fatigue
can be restored only by restorative sleep.
Many factors contribute to fatigue, includ-
ing the number of hours awake, the environ-
ment and climate, and the nature of the work.
Prevention of serious errors that result
from fatigue requires complex analysis that
takes into accou nt all such factors.
The main tool for fatigue management
that commanders and managers have some
control over is the opportunity for sleep
offered within a given watch routine, roster or
However, there is an equal responsibility
for individuals to manage their own quantity
and quality of sleep.
Individuals must also manage fatigue aris-
ing from non-work activities and moder n life-
style factors, such as a 24-hou r society, social
pressures, the inter net and inter national tel-
The full report is available on the Australian
Transport Safety Bureau website: www.atsb.gov.
SLEEPING SOUND: Fatigue in the workplace is increasing due to modern lifestyle factors,
such as a 24-hour society, social pressures, the internet and international televised sport.
Photo: LSIS Paul Berry
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