An automatic protection system which will act to shut down the plant if it enters a potentially dangerous state. In some countries this is called a Safety Instrumented System (SIS).
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.
An Emergency Shutdown (ESD) system prevents or minimizes the consequences of emergency situations, helping to avoid loss of human life, damage to the environment, and/or loss of equipment.
The ESD system is distinguished from other facility safety systems in that it responds to a hazard situation which may affect the overall safety of the entire facility. Without an ESD system, an incident at a hydrocarbon facility may be provided with "unlimited" fuel supplies that can destroy the entire plant. if the reliability of an ESD system is very poor the facility might be considered without adequate protection.
History of Siemens Safety Systems
Siemens Safety Systems
- First large safety project for offshore 1985, Oseberg Feltsenter, 15 000 safety I/O.
- To-day nearly 25% of installed safety systems in Norwegian part of the North Sea, and numerous deliveries world wide.
- First solutions, Simatic PLC's with additional hardware, 2 PLC's running independently.
- To-day a full range of S7 F, TÜV, SIL3 verified systems.
- Work procedures according to IEC61508, SINTEF verified, and a full scope of function blocks and typicals.