Human IPLs are IPLs that require operators or other staff to take action to prevent an undesired consequence, in response to alarms or following a routine check of the system.
In LOPA, you can create a Human IPL record for each type of human IPL. This record stores the recommended probability of failure on demand (PFD) of the human IPL. The PFD value indicates the likelihood that the Human IPL will fail to perform its safety function when required. The Human IPL records populate the IPL Sub Type field in the IPL Checklist section of the Safeguard, which is of type Human IPL.
By default, the following Human IPL records are available in GE Digital APM:
| Human IPL ID | Lower Range | Upper Range | Default Value |
|---|---|---|---|
| Human Action with BPCS/alarm-4 min response time | 0.01 | 1 | 0.1 |
| Human Action with >10 min response time | 0.1 | 1 | 0.1 |
| Human Action with >40 min response time | 0.01 | 0.1 | 0.1 |
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