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How to Create a Fault Tree Analysis Diagram (FTD) in ConceptDraw PRO

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How to Create a Fault Tree Analysis Diagram (FTD) in ConceptDraw PRO

Fault Tree Diagram are logic diagram that shows the state of an entire system in a relationship of the conditions of its elements. Fault Tree Diagram are used to analyze the probability of functional system failures and safety accidents. ConceptDraw PRO allows you to create professional Fault Tree Diagrams using the basic FTD symbols. An FTD visualize a model of the processes within a system that can lead to the unlikely event. A fault tree diagrams are created using standard logic symbols . The basic elements in a fault tree diagram are gates and events. Read more

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This solution extends ConceptDraw PRO v9.5 or later with templates, fault tree analysis example, samples and a library of vector design elements for drawing FTA diagrams (or negative analytical trees), cause and effect diagrams and fault tree diagrams. Read more
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The FTA diagram sample "Fault tree analysis - Insulin delivery system" was redesigned from the illustration of "CMSI 641: Introduction to Software Engineering. Design of Critical Systems. B.J. Johnson. 2005. Loyola Marymount University".
"Another way of assessing hazards is using fault tree analysis. In this process, each of the identified hazards is covered by a detailed analysis to find out what might cause it. Either inductive or deductive reasoning is applied. In the case of software hazards, the usual focus is to determine faults that will cause the system to fail to deliver a system service, such as a monitoring system. A "fault tree" is constructed to link all the possible situations together, to help identify the interrelationships of the failures, which modules may cause them, and what "trickle-down effects" there might be. Here is an example of a fault tree, as applied to the Insulin delivery system from Sommerville...
Note that this tree is only partially complete, since only the potential software faults are shown on the diagram. The potential failures involving hardware, such as low battery, blood monitor or sensor failure, patient over-exertion or inattention, or medical staff failure are noticeable by their absence.
The fault tree and safety specification processes are two ways of helping with system risk assessment tasks. Once the risks are identified, there are other assessments that need to take place. First, the likelihood of the risk occurrance must be assessed. This is often quantifiable, so numbers may be assigned based on things like MTBF, latency effects, and other known entities. There may be other non-quantifiable contributors to the risk likelihood, however, such that these must be assessed and estimated by experts in the domain. (Don't short-change this process when dealing with critical systems!) Finally, the risk assessment must include the severity of the risk, meaning an estimation of the cost to the project in the event the risk item actually does occur. "Cost to the project" means all associated costs, including schedule delays, human injury, damage to hardware, corruption of data, and so on."
[myweb.lmu.edu/bjohnson/cmsi641web/week15-2.html]
The FTA diagram example "Fault tree analysis - Insulin delivery system" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Fault Tree Analysis Diagrams solution from the Engineering area of ConceptDraw Solution Park. Read more
FTA diagram
FTA diagram, event, OR gate,
The vector stencils library "Fault tree analysis diagrams" contains 12 symbols for drawing Fault Tree Analysis (FTA) diagrams.
"Fault tree analysis (FTA) is a top down, deductive failure analysis in which an undesired state of a system is analyzed using Boolean logic to combine a series of lower-level events. This analysis method is mainly used in the fields of safety engineering and reliability engineering to understand how systems can fail, to identify the best ways to reduce risk or to determine (or get a feeling for) event rates of a safety accident or a particular system level (functional) failure. FTA is used in the aerospace, nuclear power, chemical and process, pharmaceutical, petrochemical and other high-hazard industries; but is also used in fields as diverse as risk factor identification relating to social service system failure.
In aerospace, the more general term "system Failure Condition" is used for the "undesired state" / Top event of the fault tree. These conditions are classified by the severity of their effects. The most severe conditions require the most extensive fault tree analysis. These "system Failure Conditions" and their classification are often previously determined in the functional Hazard analysis." [Fault tree analysis. Wikipedia]
The shapes example "Fault tree analysis diagrams" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Fault Tree Analysis Diagrams solution from the Engineering area of ConceptDraw Solution Park. Read more
FTA diagram symbols
FTA diagram symbols, voting gate, undeveloped event, transfer, priority AND gate, inhibit gate, house event, exclusive OR gate, event, conditional event, basic event, basic initiating fault, failure event, OR gate, AND gate,
The vector stencils library "Fault tree analysis diagrams" contains 12 symbols for drawing FTA diagrams in the ConceptDraw PRO diagramming and vector drawing software extended with the Fault Tree Analysis Diagrams solution from the Engineering area of ConceptDraw Solution Park.
www.conceptdraw.com/solution-park/engineering-fault-tree-analysis-diagrams Read more
AND gate
AND gate, AND gate,
Priority AND gate
Priority AND gate, priority AND gate,
OR gate
OR gate, OR gate,
Inhibit gate
Inhibit gate, inhibit gate,
XOR gate
XOR gate, exclusive OR gate,
Event
Event, event,
Basic event
Basic event, basic event, basic initiating fault, failure event,
Undeveloped event
Undeveloped event, undeveloped event,
House event
House event, house event,
Conditional event
Conditional event, conditional event,
Transfer symbol
Transfer symbol, transfer,
Voting gate
Voting gate, voting gate,
"Failure analysis is the process of collecting and analyzing data to determine the cause of a failure. It is an important discipline in many branches of manufacturing industry, such as the electronics industry, where it is a vital tool used in the development of new products and for the improvement of existing products. There are many companies which provide services to find the cause of failure in products, devices and in post disaster situations. The failure analysis process relies on collecting failed components for subsequent examination of the cause or causes of failure using a wide array of methods, especially microscopy and spectroscopy. The NDT or nondestructive testing methods (such as Industrial computed tomography scanning) are valuable because the failed products are unaffected by analysis, so inspection always starts using these methods." [Failure analysis. Wikipedia]
The example "Audit failure - Fault tree analysis diagram" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Fault Tree Analysis Diagrams solution from the Engineering area of ConceptDraw Solution Park. Read more
FTA diagram
FTA diagram, event, conditional event, basic event, basic initiating fault, failure event, OR gate, AND gate,
"Fault tree analysis (FTA) ... can be used to:
(1) understand the logic leading to the top event / undesired state.
(2) show compliance with the (input) system safety / reliability requirements.
(3) prioritize the contributors leading to the top event - Creating the Critical Equipment/Parts/Events lists for different importance measures.
(4) monitor and control the safety performance of the complex system (e.g., is a particular aircraft safe to fly when fuel valve x malfunctions? For how long is it allowed to fly with the valve malfunction?).
(5) minimize and optimize resources.
(6) assist in designing a system. The FTA can be used as a design tool that helps to create (output / lower level) requirements.
(7) function as a diagnostic tool to identify and correct causes of the top event. It can help with the creation of diagnostic manuals / processes." [Fault tree analysis. Wikipedia]
The fault tree analysis diagram template for the ConceptDraw PRO diagramming and vector drawing software is included in the Fault Tree Analysis Diagrams solution from the Engineering area of ConceptDraw Solution Park. Read more
FTA diagram template
FTA diagram template, exclusive OR gate, event, basic event, basic initiating fault, failure event, OR gate, AND gate,