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Conoco Phillips – Bramhall Terminal
Gasoline Safety Instrument System - Functional Safety Assessment
P & I Design Ltd
DOCUMENT NO: SI297020_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 30.03.17
Tel: + 44 (0)1642 617444
PAGE 9 OF 21
Fax: + 44 (0)1642 616447
www.pidesign.co.ukCommon cause failures are not specifically considered in the SRS. However, for a 1oo1
configuration, common cause failures are not normally an issue.
Document SI297013_RPT, Section 4, details the safe state of the process for each SIF. The
system is designed such that all components are energise to operate and the safe states is de-
energised with flow to all the tanks isolated.
There are not considered to be any
individually safe process states which, when occurring
concurrently create a separate hazard.
The sources of demand were detailed in the LOPA referenced in section 4.1 and the SIF shall
operate as a low demand mode system with demands placed on the system from operations no
more frequently than once every two years. Ref: Document SI297013_RPT, section 2.
Document SI297013_RPT, Section 4, details the annual proof test interval.
Document SI297013_RPT, Section 4, details the response times.
The SIF shall operate as a low demand mode system.
Ref: Document SI297013_RPT, section 2.