Emergency Shutdown System, in short ESD, is the most important set of equipment used during oilfield operations, such as drilling, completion, frac work, well test and production. ESD system usually consist of Emergency Shutdown Safety Valve, ESD Control Panel, piping and pushbutton.
Emergency Shutdown Safety Valve, also known as Surface Safety Valve (SSV), is a shutdown gate valve with hydraulic or pneumatic actuator, which activates when emergency occurs.