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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 10 OF 21
Fax: + 44 (0)1642 616447
www.pidesign.co.ukDocument SI297013_RPT, Section 4, details the trip points for the SIFs.
Document SI297013_RPT, Section 4, details the SIS output actions and SI297013_RPT,
Section 4 details the criteria for successful operation.
Document SI297013_RPT, Section 1.4.1, details the relationships between process inputs and
outputs.
.
Document SI297013_RPT, Section 4, details the requirements for manual shutdown.
Document SI297013_RPT, Section 4, details the requirement to de-energise to trip.
Document SI297013_RPT, Section 1.3 details the requirements for resetting after a shutdown.
The maximum allowable spurious trip rate is not specifically defined in the SRS and the
design calculation has no spurious trip calculation. SIL calculation to be redone to include
spurious trips (Action 3 - SIL Calculation to be redone) – Closed. Sensor referenced as
Magnetrol, this is incorrect.
This was discussed in the FSA and it was considered that 1 in 20 years would be acceptable
Document SI297013_RPT, Section 2 details the failure safe mode of the SIS.