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An Emergency Shutdown (ESD) system is a safety system that encloses an entire plant or process. Combined with an Emergency Depressurization (EDP) system, it ensures that all process parts are depressurized in a controlled and safe manner by directing the process substances (e.g., gas or oil) to a flare.

An ESD system is an important component in preventing the escalation from an unsafe condition to an accident:

An ESD can be triggered by transmitters (e.g. "high pressure trip"), switches, local push buttons or push buttons in a central control room. Different levels of ESD (such as a local ESD, Unit ESD, Plant ESD, Plant EDP) are distinguished depending on the requirements.

Clearly, an ESD action has a major impact on process stability and is therefore only used as a last resort. Whenever necessary, the proper operation and therefore reliability of the system is paramount. Therefore, in addition to beingsafe, these systems must alsobe highly available. In other words, both the Probability of Failure on Demand (PFD) and the Probability of Failure to Safety (PFS) must be as low as possible.

We are happy to discuss your needs and requirements for ESD/EDP system as well as any design considerations you may have. We calculate PFD and PFS values for alternative designs. We can include automatic test sequences and establish an annual valve stroke test for regulatory purposes. We enable communication with other systems in such a way that the integrity of the ESD system is not affected. And of course, we discuss your Cause & Effect (C&E) diagram in detail and are a discussion partner for HAZOPs and similar safety excercises.