The book is a guide for Layers of Protection Analysis (LOPA) practitioners. administrative pr.
Using the LOPA methodology, companies typically take credit for risk reductions accomplished through non-SIS alternatives; i.e.
It provides specific guidance on Independent Protection Layers (IPLs) that are not Safety Instrumented Systems (SIS).
It explains the onion skin model and in particular, how it relates to the use of LOPA and the need for non-Safety instrumented Independent Protection layers.
The book is a guide for Layers of Protection Analysis (LOPA) practitioners