Event & target likelihood | Cause & likelihood | IPL (Integrated Protection Layers) and its PFD (Process Failure on Demand) | Mitigated likelihood | ||
Gas coming out from bottom opening with the liquid, this might cause hammering and damage to the pump
1E−5 | Fail of the sensor to read low level, or fail of the pump at the bottom to stop draining liquids (sealing failure)
1E−1 | Human action | Alarms | SIS (PLC) | 2.6E−7 |
Human response to the alarm and manually close the valve
1E−1 | A noticeable Alarm that would start if the level keeps decreasing after the sensor’s read within a few minutes
2.6E−1 | Logic in PLC once a change in the Gas flow rate detected after the scrubber with a reasonable amount, the pump would be shutdown and the pipe after the pump sealed
1E−3 |