SI483001_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 12 OF 13

Fax: + 44 (0)1642 616447

www.pidesign.co.uk

5.0

SIF Requirements

5.1

Tank 561 High High Level

ID:

TK561 -SIF1

Service: LE56101

Independent High High

Level in Tank 561 shuts

down: XV56101 Tank-side

Import/Export valve

Reference:

Tank 561

Required SIL:

Proof Test Interval:

1 year

Response Time:

Sensor and Logic Solver < 2seconds

Final Element – Trip initiation to

valve closed < 180 Seconds,

Valve traveling Time > 90 Seconds

Activation Method:

De-energise to trip (See G.R.)

Manual reset:

Manual Reset on the SIS panel (See

G.R.)

Nuisance Trip

Requirements:

ISCo to approve

Safe State:

Import to tank 561 stopped,

XV56101 Tank-side

Import/Export valve closed

Diagnostics:

Required, at Nivotester within the

SIS monitoring panel

Manual Shutdown:

At the valve, remotely outside bund

and via 4 East Crash Stop

Regulatory Reqs:

BS-EN61511

Process Setpoint:

>5 minutes before Overflow at Max

fill rate