LF364001_MNL - Overfill Protection SIS Design Manual

Local Fuel – Shoreham Oil Terminal

Safety Requirement Specification

P & I Design Ltd

DOCUMENT NO: LF364005_RPT

2 Reed Street, Thornaby, UK, TS17 7AF

ISSUE:C DATE: 14.08.15

Tel: + 44 (0)1642 617444

PAGE 12 OF 19

Fax: + 44 (0)1642 616447

Valves and actuators will be designed for the following:



Adequate margin of safety factor shall be provided for actuators on shut-off valves (torque

need to be high enough), nominally 50% oversizing.



Isolation valves do not need to be tight shut off, but be adequate to stop dangerous flow as

well as conforming to antistatic and fire safe requirements.

This system will be installed in mainland UK where it will not be subjected to extremes of

temperature or humidity. We do not consider that

grounding, electromagnetic

interference/radiofrequency interference (EMI/RFI), shock, vibration electrostatic discharge,

flooding or lightning

will have a detrimental effect on the SIS. The system is designed to fail

safe on any loss of electrical power. The individual elements of the system shall be designed

for the process and operating conditions, the environment and the site electrical area

classification. Specifically, all wetted parts should be suitable for Petroleum Spirits and

Distillates (Gasoline, Diesel, Kerosene etc.). The level switches, valves & solenoids will be

installed in a hazardous area, refer to terminal hazardous area classification report/drawing for

specific details.

The system will be installed in clean, bunded areas with clean fluids where the plugging of

valves or dirt causing the failure of valves and actuators will be avoided. The fluids are pumped

from ships where foreign bodies will be minimised. The system will be installed with solid

state relays where the effects of EMC will be minimised.