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Control and Automation Systems (DCS / SCADA / PLC)Control and automation systems are fundamental to the infrastructure of modern refineries, industrial plants, and process facilities. These systems enable remote monitoring and control of operations with high reliability and operational safety. Depending on the complexity and nature of the industrial process, various systems are deployed, including Distributed Control Systems (DCS), Programmable Logic Controllers (PLC), and Emergency Shutdown / Safety Instrumented Systems (ESD / SIS).
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Control and Automation Systems (DCS / SCADA / PLC)Distributed Control Systems (DCS):
• Used to control complex and continuous processes in refineries, gas processing units, central processing plants (CPF/GPP), distillation units, hydrogenation units, and other facilities.
• Provides comprehensive monitoring, centralized control, and alarm management. Programmable Logic Controllers (PLCs):
• Used to control discrete processes, individual machines, or sequencing processes.
• Found in pumping stations, filling units, emergency shutdown systems (ESDs), fire suppression systems, and material handling. Emergency Shutdown Systems (ESDs) / Safety Instrumented Systems (SISs):
• Critical systems designed to safely shut down processes under hazardous conditions to prevent major accidents.
• Separate from DCS systems to ensure safety independence.
The Atmospheric Distillation Unit (ADU) is the primary and initial processing unit in a refinery, used to separate crude oil into various fractions based on their boiling points under normal atmospheric pressure.
The Vacuum Distillation Unit (VDU) is the next phase after atmospheric distillation and is used to extract heavy oil fractions under reduced pressure, allowing for their separation without thermal cracking.
The catalytic cracking unit is one of the most vital operational units in modern refineries. It is used to convert heavy fractions like heavy gas oil into light, high-value products such as gasoline, cooking gas, and light gas oil.