LF364002_RPT_E - Brighton LOPA Review

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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 37 OF 38
Fax: + 44 (0)1642 616447
5.5 ALARP
It is considered that the installation of a SIL2 for overfill is consistent with the intent of the
PSLG Guidelines and that any further risk reduction from further Safety Instrument Systems
would not be required.
5.6 Comparison of LOPA - Local Fuel v VALERO
As part of the sensitivity study the LOPA compared the results and data included in both
LOPA’s.
Description Local Fuel Valero
No of Gasoline tanks in scope 2 4
Type of Import conducted Ship Ship
Total Number of Imports per year 10 66
Imports conducted out of normal hours 3 Not stated
Average quantity transferred per import 1000m3 2135m3
Societal Risk 5.93 x 10-8/year 1.23 x 10-6 /year
Individual Risk 7.8 x 10 -8 /year 7 x 10-7 /year
Scenario 1 - Overfill of gasoline tank during import from a
ship leading to a potential open vapour cloud explosion
Risk Tolerance Criteria 1.0 x 10 -6 /year 1.0 x 10-6 /year
Frequency of Mitigated Consequence 5.93 x 10-8 /year 1.23 x 10-6 /year
Scenario 2 - Overfill of gasoline tank during import from a
ship leading to a potential flash fire
Risk Tolerance Criteria 1.0 x 10 -6 /year 1.0 x 10-5 /year
Frequency of Mitigated Consequence 3.30 x 10-7 /year 2.06 x 10-6 /year
Scenario 3 - Overfill of gasoline tank during import from a
ship leading to a potential open vapour cloud explosion, bund
wall damage and a potential MATTE
Risk Tolerance Criteria 1.0 x 10 -6 /year 1.0 x 10-6 /year
Frequency of Mitigated Consequence 1.58 x 10-7 /year 9.88 x 10-7 /year
Valero Scenario 4 - Overfill of gasoline tank during import
from a ship leading to a fire, bund wall damage and a potential
MATTE
Risk Tolerance Criteria 1.0 x 10-6 /year
Frequency of Mitigated Consequence 4.12 x 10-7 /year
Valero Scenario 5, Local Fuel Scenario 4 - Overfill of
gasoline tank during import from a ship leading to release of
gasoline and a potential MATTE
Risk Tolerance Criteria 1.0 x 10 -6 /year 1.0 x 10-6 /year
Frequency of Mitigated Consequence 6.59 x 10-8 /year 4.12 x 10-7/year