![](/assets/images/picto-drapeau-france-3a76576a5d60a512053b4612ab58dae5.png)
9. Glossary
Availability, operating status; up state
A condition characterized by the ability to function as required.
State of unavailability, state of failure; down state
A condition characterized by inability to function as required.
Instantaneous availability, A(t)
Probability of being available at a given time.
Instantaneous unavailability, U(t)
Probability of being unavailable at a given time.
Disponibilité moyenne; average availability, A moy (T )
Average value of availability A(t) over the interval [0, T ]. Average availability can also be defined over an interval [t 1 , t...
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference
This article is included in
Safety and risk management
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Glossary
Bibliography
Software tools
GRIF-Workshop software package (GRaphique Interactif pour la Fiabilité), developed by ELF and then for TOTAL by SATODEV
– BFIAB module: reliability diagrams
– Module Tree: fault trees
– ETree module: event trees
– SIL module: BDF adapted to functional safety
– Petri module: stochastic Petri nets...
Websites
GRIF-Workshop: Demo versions downloadable at http://grif-workshop.fr
Standards and norms
- Diagrammes de fiabilité - CEI (IEC) CEI 61078 - 2016
- International electrotechnical vocabulary – Part 192: Dependability - CEI (IEC) IEC 60050-192 (IEV 192) - 2015
- Expressions mathématiques pour les termes de fiabilité, de disponibilité, de maintenabilité et de logistique de maintenance - CEI (IEC) CEI 61703 - 2016
- Petroleum, petrochemical and natural gas industries – Reliability modelling and...
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
GRIF-Workshop software package. SATODEV (SAfety TOols DEVelopment) http://www.satodev.com
Organizations – Federations – Associations (non-exhaustive list)
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference