A passive IPL can achieve its risk reducing function without the requirement to take any action or change the state of the system. For example, detonation arrestors and blast walls are passive IPLs that reduce the risk.
In LOPA, you can create a Passive IPL record for each type of passive IPL. This record stores the recommended probability of failure on demand (PFD) of the passive IPL device or system. The PFD value indicates the likelihood that the passive IPL system will fail to perform its safety function when required. The Passive IPL records populate the IPL Sub Type field in the IPL Checklist section of the Safeguard, which is of type Passive IPL.
By default, the following Passive IPL records are available in GE Digital APM:
| Passive IPL ID | Lower Range | Upper Range | Default Value |
|---|---|---|---|
| Blast-wall/Bunker | 0.001 | 0.01 | 0.001 |
| Fireproofing | 0.001 | 0.01 | 0.01 |
| Open Vent | 0.001 | 0.01 | 0.01 |
| Underground Drainage System | 0.001 | 0.01 | 0.01 |
| Flame/Detonation Arrestors | 0.001 | 0.1 | 0.01 |
| Dike | 0.001 | 0.01 | 0.01 |
| Inherently Safe design | 1E-06 | 0.1 | 0.01 |
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