Scene 1 (0s)
RX. Dryer. Process Overview. FM. Mill. Silo. FU. Big bag.
Scene 2 (4s)
[Audio] Prevent ignition source Static electricity spark / electrical arc – proper grounding/earthing of equipment & vessel Mechanical contact of moving parts – proper maintenance and reporting of equipment failures Metal detector/divertor between dryer and mill Dust confined in vessel Hatch must be kept always closed during operation Pressure can be safely released by explosion doors System designed to pneumatically transfer powder with negative pressure – in event of sealing failure, will not blow out and create a dangerous dust cloud in workplace.
Scene 3 (40s)
[Audio] Stop feeding of fuel to fire Stop suction FM -> prevent feeding of more fuel to fire Stop discharge to dryer – manually or by interlock trigger RX discharge XV Stop Rotary valve -> segregate into sub-process and limits amount of fuel Reduce fresh air being feed to fire Stop FM -> prevent feeding of more oxygen to fire Automatic & manually activated steam valve to dryer to cutoff oxygen to fire Contained inside equipment Do not attempt to release burning or smoldering material from equipment into workplace.
Scene 4 (1m 15s)
[Audio] Prevent ignition source [enforcement] Static electricity spark / electrical arc – proper grounding/earthing of big bags & equipment Limit rate of discharge from big bags (fast particle movement – high accumulation of static charges) Strictly no discharging of fresh warm/hot powder into equipment (fresh powder – possess static charges) Ensure no incompatible work (such as hotwork) near rework area Dust confined in vessel – Stop bag discharge, hatch of hopper must be closed before re-start of dryer operation.
Scene 5 (1m 53s)
[Audio] Prevent ignition source Static electricity spark / electrical arc – proper grounding/earthing of equipment & vessel Minimise dispersion – Immediately stop equipment – blow out of dust due to plugging or suction failure Use vacuum system to remove dust from workplace, do not use compress air to blow Keep operating vessel hatch closed – to prevent explosion in vessel leading to dispersion of dust inside building Minimise dispersion – Immediately stop equipment – blow out of dust due to plugging or suction failure Use vacuum system to remove dust from workplace, do not use compress air to blow Keep operating vessel hatch closed – to prevent explosion in vessel leading to dispersion of dust inside building Minimise dust accumulation in workplace – Daily housekeeping During annual shutdown - thorough housekeeping to remove dust from difficult to reach areas (secondary dust explosion prevention) Hot work near process openings (sparks into process or material out from process) [PTW, RA] Mechanical contact of moving parts – proper maintenance and reporting of equipment failures.
Scene 6 (3m 46s)
HH: PLC -> Alarm + Close RX discharge valve + steam purge line L : PLC -> Discharge allowed Dryer LSH LSHH LSL TC H: PLC -> Alarm Operator intervention.
Scene 7 (4m 5s)
Dryer Temperature interlocks. 75oC –> PLC: Alarm + Close RX discharge valve + steam purge line.
Scene 8 (4m 24s)
Dryer Temperature and level interlocks. FM. TC. High Temp interlock.
Scene 9 (4m 43s)
Hatch unlock – after 60sec. Dryer Hatch Open Interlock.