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This Concept Map, created with IHMC CmapTools, has information related to: Node_18b_Procedure to burn gas - I, Purge Permissives actions 13. Check - It can be seen that all these purge sequences are not available because the Main Nitrogen Valves are shut, Procedures to burn gas I Simulator Groups Main Distrib, Gas Detection actions 9. Start up the Boiler Hood Fans 1 and 2., FG Bnr Mgt actions 10. Reset the Master FG Valve - The "FG Extr. Fans" and "ER Extr. Fan MAster" FG V/V Trip Causes lights to extinguish., LD Compressors actions 6. Start LD compressor 1, Procedures to burn gas I Simulator Groups Purge Permissives, LD Compressors actions 3. Open LD 1 inlet and outlet valves., LD Compressors actions Note: The vanes are adjusted by a signal from the Fuel Gas (FG) Control valve which is shut and so the LD compressor does not trip on HP outlet pressure., Gas Detection actions 8. Start up the Vent Duct Fans 1 and 2., Main Distrib actions 7. Close the ER Exhaust Fans breaker, Procedures to burn gas I Simulator Groups Gas Detection, Instructor LNG Tanks actions 1. Open all 4 Cargo tank valves to the Vapour Main, Procedures to burn gas I Simulator Groups FG Bnr Mgt, FG Bnr Mgt actions 11. Fuel Gas (LNG Boil off) can not be used until the gas lines are purged with Nitrogen., Procedures to burn gas I Simulator Groups Continued to other Simulator Groups in Procedure II, LD Compressors actions 5. Open Steam Heating to the gas Heater., LD Compressors actions 4. Open LD 2 inlet and outlet valves., FG Bnr Mgt actions 12. There are 3 Purge sequences: a) Main Line Purge b) Stbd and Port Header Purge c) Individiual Burner Purges, Procedures to burn gas I Simulator Groups Instructor LNG Tanks, LD Compressors actions 2. Open the Vapour Main to De-Mister valve.