Emergency Shutdowns and Alarms at LNG Storage Sites Quiz

Emergency Shutdown and Alarms at LNG Storage Sites

• Emergency Shutdown (ESD) system is a network of valves and buttons that automatically stop the flow of LNG from tanks in case of an emergency.
• Each ESD button is labeled with a sign indicating its location.
• The valves used to control the flow of LNG and vapor are linked to become ESDs when activated.
• ESDs can be manually activated by operators or triggered by gas detectors or fire eye safety relay faults.
• When ESD is activated, power is cut to motor actuated and electric control solenoid valves controlling the LNG tank out valves.
• Storage Site #1 and #2 have Boiler ESD buttons that shut down the burner on each of the boilers and the glycol heating system in case of an emergency.
• Alarms activate to alert operators of monitored events, and unique alarm notifications are sent out to individual phone numbers.
• Gas detectors have a 60-minute manual override during LNG tanker offloads to prevent alarms at 25% LEL.
• To restore the site to normal conditions after an alarm or ESD, operators need to acknowledge the alarm and return the ESD buttons to their normal position.
• The distribution system also has unique alarm notifications sent out to individual operator’s phone numbers for low and high distribution pressure.
• Operators need to follow SOP 7150 Fire Detection Equipment Maintenance after an alarm has been activated.
• Clearing hazardous environments or situations is necessary before restoring the storage site to normal conditions.