SI057001_MNL - Gasoline Overfill Protection SIS IMMEAS-SIS1 Design Manual

Immingham Storage Co Ltd – Immingham East Terminal

IME-SIS1 - Safety Instrument System Safety Requirement Specification

P & I Design Ltd

DOCUMENT NO: SI277010_RPT

2 Reed Street, Thornaby, UK, TS17 7AF

ISSUE: G DATE: 31.10.14

Tel: + 44 (0)1642 617444

PAGE 7 OF 13

Fax: + 44 (0)1642 616447

2.3

System Structure

2.3.1 System Model – No. 4 East Tanks

Tanks 561, 564 & 568.

The SIF is based upon a 1oo1 (single) sensor, 1oo1 (single) logic solver and 1oo1 final

element with no redundancy.

Note 1: Shaded areas do not affect safety function

Note 2: New System models will be developed for future phases of the SIS

Level

Element

Sensor Subsystem

Logic Subsystem

Safety Relay

With Manual

Reset

Solenoid

Valve

Final Element Subsystem

BPCS

Fault Trip SIS Valve

Status Status Status

Feedback

Relay

Air Isolation

Actuated

Valve

Limit

Switches

Level

Switch