Event 1 (E1) Presence of objects (for example, bolts) in
the mud feed
Event 2 (E2) Human error – cyclone set point at T > 110 C
Event 3 (E3) Temperature control failure (thermocouple
failure)
Event 4 (E4) Boiler’s three-way valve failure
Event 5 (E5) Alarm failure relevant to high T (T > 125 C at
mill exit is not recognized)
Event 6 (E6) High temperature (T > 125 C) alarm
deactivation (intentional)
Event 7 (E7) Failure of the fan
Event 8 (E8) Failure of the manometers
Event 9 (E9) Mud too wet
Event 10 (E10) Anomalous mud
Event 11 (E11) Wet mud’s feed clogged or engine failure
Event 12 (E12) Emergency stop do not work (in case of
automatic operation)
Event 13 (E13) Feed-back stop not activated by the operator
(case of manual operation)