Table 7 Comparison between traditional and fuzzy logic LOPA.
From: Applying a semi-quantitative risk assessment on petroleum production unit
Scenarios | Layers of protection analysis (LOPA) | Fuzzy logic | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Simple rules | Hard rules | |||||||||||
TEF | MEF | RRF | SIL | TEF | MEF | RRF | SIL | TEF | MEF | RRF | SIL | |
1. High pressure/low pressure interface (HP/LP) between the new crude oil shipping pumps’ discharge side AND the existing crude oil pumps discharge side | 1E−4 | 1E−2 | 100 | 2 | 2.88E−4 | 1E−2 | 35 | 1 | 1.48E−4 | 1E−2 | 78 | 1 |
2. Reverse flow from the new crude oil pumps’ discharge into the existing crude oil pumps’ discharge | 1E−5 | 65E−5 | 65 | 1 | 2.95E−5 | 65E−5 | 22 | 1 | 1.55E−5 | 65E−5 | 42 | 1 |
