Page 26 - Critical Control flipbook_Neat

CRITICAL CONTROLS

Coal Mill Explosion

Damper, Fan and Mill System Trip

Early detection of change prevents the formation of an explosive

atmosphere by stopping fans and the coal mill, as well as tripping and isolating

the baghouse by slam shutting the dampers.

Operator aware of critical Periodic ‘end-to-end’ trip Safety-critical equipment
limits and correct response testing carried out and is colour coded or tagged
for sensors, alarms and recorded in maintenance and uniquely identified

interlocks. management system. in the maintenance
management system.

End-to-end trip
testing
• Sensor/detector
• Control system
(PLC)
• Actuator/
end-element

o C

CO

O and CO analyser
2

Trip fans and damper system

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