IEEE 3006.7-2013 pdf free.IEEE Recommended Practice for Determining the Reliability of 7×24 Continuous Power Systems in Industrial and Commercial F acilities.
This recommended practice describes how to determine the reliability of 7×24 continuous power systems in industrial and commercial facilities. The method of’ reliability analysis by probability methods is described first. This is followed by a discussion of how to evaluate the results and how to implement changes to ensure that the expected degree of reliability is achieved
2. Normative references
The tbllowing referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each ret’ercnced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
For the purposes of this document, the following terms and definitions apply. The IEEE Siandurdc Dkiionarv Online should be consulted lbr terms not defined in this clausc.3
aailahiIitv: (A) (general) The ability of an item—undcr combined aspects of its reliability, maintainability, and maintenance support—to perform its required function at a stated instant of time or over a stated period of time. (B) (As a performance metric for individual components or a system) The long-term average fraction of time that a component or system is in service and satisfactorily performing its intended function. (C) (As a future prediction) The instantaneous probability that a component or system vill be in operation at time t.
failure mode: The manner or form by which a particular component or system fails; the way the component or system manifests unacceptable operation.
fault tree analysis (FTA): A systematic, deductive methodology for determining all of the credible ways for a specific undesirable event to occur. The undesirable event to be analyzed is the top event of the fault tree. The fault tree uses Lloolcan algebra (AND gates, OR gates, etc.) in a graphical representation to show the logical interrelationships between the initiating basic events, such as component failures, and the top event.
inherent availability (Al): Long-term average fraction of time that a component or system is in service and satisfactorily performing its intended function. Ai considers only downtime for repair of failures. No logistics time, preventative maintenance. etc., is included.
mean time between failures (MTBF): The arithmetic mean of the times (observed or calculated) between random failures of a component or system.
mean time to repair (MTTR or simply r): The mean time to replace or repair a failed component. Logistics time associated with the repair, such as parts acquisitions and crew mobilization, are not included. It can be estimated by dividing the summation of repair times by the number of repairs and, therefore, is practically the average repair time. The most common unit in reliability analyses is hours (h/f).IEEE 3006.7 pdf free download.