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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 15 OF 38
Fax: + 44 (0)1642 616447
www.pidesign.co.ukIn this case the anticipated number of casualties is considered to be in the order of 120.
Thus the broadly acceptable risk would be in the order of 1.2 x 10
-7
/year and the
intolerable risk would be in the order of 1.2 x 10
-5
/year. For the scenario discussed in this
LOPA of an open flammable cloud explosion causing up to 120 fatalities. The calculated
frequency is 5.9
3
x 10
-8
/year, thus this is within the ‘Broadly Acceptable’ region.
Individual Risk
This is not directly related to an individual’s risk of on-site fatality. (Ref. PSLG
Guidelines, Appendix 2, Clause 43). A Process Hazards Analysis has been carried out to
assess the risk of fatality to individuals and is included in table 9.6 of the COMAH report.
For the above scenario of an open flammable cloud explosion or fire, the calculated risk is
3.89 x 10
-7
. For any Local Fuel employee on the normal shift pattern. The following apply:
No of hours per shift:
12
No of shifts per year:
2.8 x 52
Total hours per year:
1752
Fractional exposure:
0.2
Cumulative Frequency of safety scenarios: 3.89 x 10
-7
/year
Individual Risk from the safety scenarios 7.8 x 10
-8
/year
Thus this a small fraction of the overall individual risk to an operator
Number of Fatalities