Risk-Based Inspection

QRA logic models generally consist of event trees and fault trees. Event trees
delineate initiating events and combinations of system successes and failures,
while fault trees depict ways in which the system failures represented in the
event trees can occur. These models are analyzed to estimate the probability
of each accident sequence. 逻 辑 模 型 一 般 包 括 (1) 事 件 树 和 (2) 故 障 树
Results using this approach are typically presented as risk numbers (e.g. cost
per year). QRA refers to a prescriptive methodology that has resulted from
the application of risk analysis techniques at many different types of facilities,
including hydrocarbon and chemical process facilities. For all intents and
purposes, it is a traditional risk analysis.
An RBI analysis shares many of the techniques and data requirements with a
QRA. If a QRA has been prepared for a process unit, the RBI consequence
analysis can borrow extensively from this effort.
API 580
Charlie Chong/ Fion Zhang