Emergency Shutdown

“An emergency shutdown (ESD) system is a method to rapidly cease the operation of a process and isolate it from incoming and outgoing connections or flows to reduce the likelihood of an unwanted event from occurring, continuing or escalating. The aim of the ESD system is to protect personnel, afford protection to the facility, and prevent the occurrence of an environmental impact from a process event.”


“An ESD system should have, as a minimum, the following design features:

–        Shutdown reverts the process to a safe state

–        Prevents subsequent process operation until the cause of the shutdown has been corrected

–        Prevents unintended process startup until correction of the shutdown”

Reference: Nolan, Dennis P. Handbook of Fire and Explosion Protection Engineering Principles for Oil, Gas, Chemical and Related Facilities (2nd Edition), Chapter 11.pp.119