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Local Fuel plc - Shoreham Oil Terminal
Safety Instrument System Functional Safety Assessment Stage 5
P & I Design Ltd
DOCUMENT NO: LF364100_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: B DATE: 07.06.2016
Tel: + 44 (0)1642 617444
PAGE 22 OF 51
Fax: + 44 (0)1642 616447
www.pidesign.co.ukThe second part of the final element sub-system is a PEKOS ball valve. Exida have certified
this component as SIL 3 capable. In accordance with BS EN 61511 the device can be used in
a SIL 3 with HFT = 1 and SIL 2 with HFT = 0 with a PFD of 1.48x10
-3
.
Calculation Summary:
REVISION B- From the supplied components and BS EN 61508 certification it confirms that
the system does comply to the requirements of a PFD and HFT for a SIL 2 SIS, with a PFD
SYS
of 3.93x10
-3
.