Emergency Shutdown (ESD) System are specialized highly reliable control systems for high risk industries like Oil and Gas, Nuclear Power or other Environments with explosion risk (Ex.). Their purpose is to protect personnel, plant, and the environment in case the process goes beyond the control margins.
Emergency Shutdown System (ESD) is designed to minimize the consequences of emergency situations, related to typically uncontrolled flooding, escape of hydrocarbons, or outbreak of fire in hydrocarbon carrying areas or areas which may otherwise be hazardous.
In practice the plant is usually divided into several isolable units that can be depressurized and isolated.
ESD system ensures priority control of process equipment which is required for switching the process in safe mode. The system performs the following functions:
ESD system can be developed both as a technically separate system which is integrated into DCS at the middle level of control and as a system functionally integrated into DCS at the lower control level.
The integration of different systems like Fire and Gas system, compressor, DCS or other systems may vary from from one industry to another. It depends on specific industry standards. The below figure is an simple example of ESD system.
* May alternatively form part of the fire/gas detection and protection system.
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ALL DOCUMENTS ARE VERY MUCH INFORMATIVE & PRACTICAL .
K.P.RAMASWAMY,
HEAD - INSNT&AUTOMATION,
M/S SHRIJEE PROCESS ENGG WORKS LTD, MUMBAI.
1. Why ESD is always at the gas pipeline entry point near fence in power plant even though the Gas pipeline is 1 km away from ESD
2. what are the signals normally provided to emergency closure of the valve
ans:-
(1)-ESD valve is provided near to fence, because it isolate line and plant during emergency condition, ie Gas leak, Fire detection in plant.
(2)- DO from ESD PLC to initiate trip of ESD valve when causes ie deviation occurs..
Pressure fluctuation,
Gas leakage
Fire detection etc...