This Step is protected by the following:04IS 1001: EMERGENCY SHUT-OFF OF TEAL UNLOADING FROM CYLINDER (ESD)CAUSES OF ACTION:1) Actuation of 04HS 1001 START 2) Actuation of 04HS 1002 START 3) Flame presence signaled by 04BS 1001ACTIONS:1) Shuts 04HV 1005 (Teal from cylinder)2) Shuts 04HV 1006 (Pressurization nitrogen to cylinder)3) Opens 04HV 1007 (Blanketing to 04Z 110)4) Shuts 04HV 1109 A/B (Teal feed line to 04D 110)5) Board signaling of 04IS 1001 ON04IS 1001 is manually RESET by 04HS 1001 RESET or 04HS 1002 RESET.Note: 04HS 1001 START is on local board 04HS 1002 START is in safe position on near boardFlame detector failure shall not be involved in the interlock