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Safety and environmental standards for fuel storage sites
Final report
187
Potential leading indicators:
number of times ullage checks not done correctly before product transfer begins;
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number of times inspection and maintenance of tank gauging system not carried out to required
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frequency.
4 Accidental leakage during tanker loading
Outcomes:
during product transfer no leaks;
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breaking couplings after transfer – not more than 1 litre.
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Potential lagging indicators:
number of times there is a leak of more than 1 litre following product transfer or any leak
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during the transfer.
Critical elements of the risk control system:
reliable equipment – couplings and faucet (hours of use and change-out time);
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operator error – stretch, position of vehicles;
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mistreatment;
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maintenance and inspection of vacuum breaker/faucet/coupler;
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truck maintenance;
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maintenance.
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Potential leading indicators:
% of STOP observations on loading bay operations where drivers are not following procedures;
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% failure of truck API inspections.
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5 Tank subsidence
Outcomes:
tank configuration within relevant API or EEMUA;
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any detectable signs of adverse distortion or movement.
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Lagging indicator selected:
number of tanks where there is adverse distortion or movement.
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Critical elements of the risk control system:
inspection and maintenance of tanks;
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appropriate and timely action follow-up;
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independent review of findings.
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Leading indicators:
number of tanks inspected to schedule;
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number of corrective actions completed to time.
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6 Leaks from pumps
System outcomes:
no pump leakage due to seal failure.
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