Page 456 - Offshore Electrical Engineering Manual

Preparation and Use of Performance Standards 443

INSTALLATION: PERFORMANCE STANDARD: EMERGENCY SHUTDOWN SYSTEM (cont.)
Component Test & Frequency Assurance
Inter-ESD System A dedicated dual redundant data link connects the ESD systems on the Verified through inspection
Communication Checking nearby installations [if any] to carry intertrip signals identified on the and testing.
cause and effect charts. ReferenceESD
Maintenance Routines.
Computers I/O devices Regular shutdown path checking from the system inputs to the system System is self-checking in
outputs is automatically carried out by the system at a frequency accordance with Functional
sufficient to ensure system faults are detected, alarmed, and executive Design Specification for
actions taken to achieve the availability/ reliability requirements of the Emergency Shutdown
ESD system. System
Regular function testing of
ESD System
Computer control Each system is subdivided into a solid-state logic system for Category 1 Instrument Based
signals and a programmable system for Category 2 signals. Protective Systems
IEC 61511:2016
Survivability Requirement Assurance
ESD Level 0 Emergency systems and essential services with Ex d protected built in Functional Design
power supplies would be left operational, including: Specification for
emergency lights Emergency Shutdown
navigational aids System
PA/GA systems
Additionally the diesel firewater pumps would remain operational until
the diesel supply was exhausted.
Fire & Explosion Risk Evaluation and Protection Philosophy Study -ESDVs and Risk Evaluation and
Blowdown valves rated to API specification. Protection Philosophy,
Design drawings and
inspection.
UPS Providing electrical power to computer systems See UPS performance
standard
Hydraulic Valves Provide isolations
Pressure Relief System Reduces pressure in the process equipment and reduces loss of inventory. See pressure relief
performance standard
Fire and gas detection Initiates ESD shutdown See F&G performance
standard
Hazardous Area Certified Ex rated equipment in place See Hazardous Area
Equipment Equipment performance
standard
HVAC Executive actions carried out by ESD on HVAC system See HVAC performance
standard
Environmental Justification Reference
ESD Sectionalises the plant in the event of a hazardous situation occurring, in Cause & Effect Matrix
order to reduce the potential escape of environmentally hazardous
inventory
Excluded components Justification Reference
Emergency Power All systems are fail safe or UPS maintained See UPS performance
standard
FIGURE 9.2.1, cont’d