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Local Fuel – Shoreham Oil Terminal
Gasoline Ship Import – Layers of Protection Analysis
P & I Design Ltd
DOCUMENT NO: LF364002_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: E DATE: 30.07.15
Tel: + 44 (0)1642 617444
PAGE 35 OF 38
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www.pidesign.co.uk5.3.8 Conditional Modifiers – Scenario 4, Environmental, Overfill of tank during import from a
ship and a possible release to the Harbour corresponding to a potential short-term Major
Environmental Consequence.
1. Probability of bund failure
The probability of un-ignited Gasoline or other product escaping from the bunds in is
dependent on the period of the release and the capacity of the bund. The tank is installed in
an impervious bund with adequate capacity, wall strength. The quantity of liquid potentially
released is much lower than the bund capacity.
Reference “Bund effectiveness in preventing escalation of tanks farm fires”, Davies,
Harding, MaKay, Robinson and Wilkinson, IChemE symposium series No 139. Also
published as Process safety and environmental protection, Trans IchemE vol. 74, n
o
2, pp.
88-93, 1996
Probability of bund wall failure without fire/explosion is taken as
0.1
2. Probability of release into the harbour
Gasoline or other product would need to travel southwards to reach the riverbank and be of a
sufficient quantity and duration to constitute a major Environmental Consequence. This is
seen to be a low probability, and guidance has been taken.
Reference “Bund effectiveness in
preventing escalation of tanks farm fires”, Davies, Harding, MaKay, Robinson and
Wilkinson, IChemE symposium series No 139. Also published as Process safety and
environmental protection, Trans IchemE vol. 74, n
o
2, pp. 88-93, 1996
.
Probability of a tertiary containment failure
0.1