Emergency Shut Down (ESD) System
An emergency shutdown system for a process control system includes an emergency shutdown (ESD) valve and an associated valve actuator. An emergency shutdown (ESD) controller provides output signals to the ESD valve in the event of a failure in the process control system. A solenoid valve responds to the ESD controller to vent the actuator to a fail state. A digital valve controller (DVC) test strokes the ESD valve. An impedance booster device enables the dc powering of the solenoid valve and the DVC over a two wire line while still permitting digital communication over the same two wire line.
Typical Actions from an Emergency Shutdown System
- Shutdown of part systems and equipment
- Isolate hydrocarbon inventories
- Isolate electrical equipment
- Prevent escalation of events
- Stop hydrocarbon flow
- Depressurize / Blow down
- Emergency ventilation control
- Close watertight doors and fire doors
Fire & Gas (F&G) System
Fire and gas detection system shall – via various instruments – continuously monitor all areas for abnormal conditions. In the event of a hazardous situation being detected, the system shall provide the operator with the information of detection/protection systems on demand in the Central Control Room.
These will give warnings to personnel of any hazardous situations arising. Depending upon the level of hazard this detection equipment will also shut-down process equipment and actuate automatic fire fighting systems.
- Flame Detector
- Smoke Detector
- Toxic Gas Detector
- Combustible Gas Detector