SI057001_MNL - Gasoline Overfill Protection SIS IMMEAS-SIS1 Design Manual

Immingham East Terminal – Gasoline Overfill Protection

Safety Instrument System

P & I Design Ltd

DOCUMENT NO: SI277001_RPT

2 Reed Street, Thornaby, UK, TS17 7AF

ISSUE:

DATE: 31.10.14

Tel: + 44 (0)1642 617444

PAGE 12 OF 29

Fax: + 44 (0)1642 616447

DESIGN & DEVELOPMENT OF SIS

7.1

System Structure

7.1.1 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 only one valve is routed to the import).

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