LNG Storage Safety

Study Notes

Emergency Shutdown and Alarms in LNG Storage Sites

Emergency Shutdown (ESD) is a system of valves and buttons that immediately stops the flow of LNG from the tanks in case of an emergency.
There are signs above each ESD button showing its location.
The valves actuated by ESD at SS#1 and SS#2 include those used for LNG production and vapor control.
ESDs can be activated manually or by gas and fire detectors.
If ESD is activated, power is cut to motor actuated and electric control solenoid valves controlling the LNG tank out valves.
Boiler ESD system is used to shut down boilers and glycol heating systems in case of an emergency.
LNG Storage Sites have alarms that activate visual and audible signals and send notifications to individual phone numbers.
Unique alarm notifications include PLC not operating, UV flame detectors activated, gas detectors reaching 25% and 50% LEL, GVEA power outage, low distribution pressure, and low gas temperature.
The distribution system also has unique alarm notifications for low and high distribution pressure.
Gas detector alarms have a 60-minute manual override for use during LNG tanker offloads.
To clear alarms and ESD conditions and return the site to normal status, operators need to follow specific procedures depending on the storage site.
Operators receive initial training and must be reevaluated when new procedures are incorporated or when deemed necessary, and continuing instruction is conducted at intervals not to exceed two years.

Emergency Shutdown and Alarms in LNG Storage Sites

Emergency Shutdown (ESD) is a system of valves and buttons that immediately stops the flow of LNG from the tanks in case of an emergency.
There are signs above each ESD button showing its location.
The valves actuated by ESD at SS#1 and SS#2 include those used for LNG production and vapor control.
ESDs can be activated manually or by gas and fire detectors.
If ESD is activated, power is cut to motor actuated and electric control solenoid valves controlling the LNG tank out valves.
Boiler ESD system is used to shut down boilers and glycol heating systems in case of an emergency.
LNG Storage Sites have alarms that activate visual and audible signals and send notifications to individual phone numbers.
Unique alarm notifications include PLC not operating, UV flame detectors activated, gas detectors reaching 25% and 50% LEL, GVEA power outage, low distribution pressure, and low gas temperature.
The distribution system also has unique alarm notifications for low and high distribution pressure.
Gas detector alarms have a 60-minute manual override for use during LNG tanker offloads.
To clear alarms and ESD conditions and return the site to normal status, operators need to follow specific procedures depending on the storage site.
Operators receive initial training and must be reevaluated when new procedures are incorporated or when deemed necessary, and continuing instruction is conducted at intervals not to exceed two years.