10 - Assessing Consequence of Failure Flashcards
Introduction to Consequence Analysis:
The consequence analysis in an RBI program is performed to provide ,,,,, between equipment items on the basis of ,,,,,,,
discrimination
the significance of a potential failure.
Introduction to Consequence Analysis:
The COF analysis shall be performed to estimate the consequences that are likely to occur due to ,,,,
a failure mode
Introduction to Consequence Analysis:
Consequence should typically be categorized as;
- safety and health impacts
- environmental impacts
- economic impacts
Introduction to Consequence Analysis:
In general, an RBI program will be managed by,,,, or ,,, who will normally manage risk by managing the POF with ,,,, and ,,,,
plant inspectors or inspection engineers
inspection & maintenance planning
Introduction to Consequence Analysis:
plant inspectors or inspection engineers will not normally have much ability to,,,,,the COF.
modify
Introduction to Consequence Analysis:
On the other hand, ,,,, and ,,,, personnel may desire to manage the consequence side of the risk equation
management
process safety
Introduction to Consequence Analysis:
the consequence analysis is an aid in establishing a ,,,,
relative risk ranking of equipment items
Introduction to Consequence Analysis:
The consequence analysis method chosen should have ,,,,,, ability to provide the required level of ,,,, between higher and lower consequence equipment items.
a demonstrated
discrimination
Loss of Containment:
Although RBI is mainly concerned with loss of ,,,,,
containment failures
Loss of Containment:
The consequence of loss of containment is generally evaluated as loss of ,,,,
fluid to the external environment
Types of Consequence Analysis;
it should be
recognized that “qualitative” and “quantitative” are the ,,,,, rather than distinctive approaches
end points of a continuum
Qualitative Consequences Analysis:
the consequences of failure (safety, health, environmental, and financial impacts) can be estimated ,,,,,, unit, system, equipment group, or individual equipment item.
separately for each
Qualitative Consequences Analysis:
For a qualitative method, a consequences category (such as ,,,,,,”) is typically assigned for each unit, system, grouping, or equipment item. It may be appropriate to associate ,,,,,, such as ,,,
“A” through “E” or “high,” “medium,” or “low
a numerical value
cost
Quantitative Consequences Analysis;
A quantitative method involves using ,,,,
a logic model
Quantitative Consequences Analysis;
Quantitative models usually contain one or more standard failure ,,,, or ,,,, and calculate COF
scenarios or outcomes
Units of Measure in Consequence Analysis:
The analyst should bear in mind that the resultant consequences should be ,,,,, as much as possible, for subsequent risk prioritization and inspection planning
comparable
Units of Measure in Consequence Analysis:
The following provide some units of measure of consequence that can be used in an RBI assessment
Safety: ,,,,,,
Cost,,,,,
- e.g. A through E
- low, moderate, and high
Units of Measure in Consequence Analysis:
Formula;
loss of fluid =
volume of fluid lost × value of fluid per unit volume
Flammable Events (Fire and Explosion):
Flammable events can cause damage in two ways:
thermal radiation and blast overpressure.
Environmental Consequences:
The consequences of environmental damage are best understood by cost. The cost may be calculated as follows;
Formula;
environmental cost =
cost for cleanup + fines + other costs
Production (Business Interruption) Consequences:
The main production consequences for RBI are ,,,,
financial
Production (Business Interruption) Consequences:
Formula;
coat of lost fluid =
Volume released X Value of Fluid Lost
Production (Business Interruption) Consequences:
Formula;
Business Interruption =
process unit daily value × downtime (days)
Production (Business Interruption) Consequences:
,,,,, estimate would represent the time required
to get back into production
The downtime
Production (Business Interruption) Consequences:
The ,,,,,, is a typical method of estimating downtime after a fire or explosion.
Dow Fire and Explosion Index
