AS IEC 60300.3.11-2004 pdf – Dependability management Part 3.11: Application guide—Reliability centred maintenance

AS IEC 60300.3.11-2004 pdf – Dependability management Part 3.11: Application guide—Reliability centred maintenance.
1 Scope This part of IEC 60300 provides guidelines for the development of an initial preventive maintenance programme for equipment and structures using reliability centred maintenance (RCM) analysis techniques. References to a maintenance programme in this standard implies that it is a preventive maintenance programme. This application guide is an extension of IEC 60706-4. Those maintenance activities recommended in IEC 60706-4 which relate to preventive maintenance may be implemented using reliability centred maintenance methodology. RCM analysis can be applied to items such as a ground vehicle, ship, power station, aircraft, etc, which are made up of equipment and structure, e.g. a building, airframe or ship’s hull. Typically an equipment comprises a number of electrical, mechanical, instrumentation or control systems and subsystems which can be further broken down into progressively smaller groupings, as required. RCM techniques specifically applicable to structures are given in annex A. This standard is restricted to the application of RCM techniques and does not include aspects of maintenance support, which are covered by other standards in the IEC 60706 series. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60300. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 60300 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60050(1 91 ):1 990, International Electrotechnical Vocabulary (IEV) – Chapter 1 91 : Dependability and quality of service IEC 60300-3-9:1 995, Dependability management – Part 3: Application guide – Section 9: Risk analysis of technological systems
3 Definitions and abbreviations 3.1 Definitions For the purpose of this part of IEC 60300, the terms and definitions of IEC 60050(1 91 ) apply together with the following. Some terms listed in IEC 60050(1 91 ) are also included here for the convenience of the reader. 3.1 .1 accidental damage (AD) physical deterioration of an item caused by contact or impact with an object or influence which is not a part of the equipment, or by human error during manufacturing, operation of the equipment, or maintenance 3.1 .2 age exploration systematic evaluation of an item based on analysis of collected information from in-service experience. It assesses the item’s resistance to a deterioration process with respect to increasing age 3.1 .3 criticality numerical index of the severity of an effect combined with the probability or expected frequency of its occurence 3.1 .4 damage-tolerant an item is judged to be damage-tolerant if it can sustain damage and continue to function as required, possibly at reduced loading or capacity 3.1 .5 discard removal from service of an item at a specified life limit 3.1 .6 direct adverse effect on operating safety direct adverse effect on safety effect that the functional failure or resulting secondary damage should achieve by itself, not in combination with other functional failures (no redundancy exists and it is a primary item necessary for safe operation). The consequences are extremely serious or possibly catastrophic and might cause the loss of equipment or injury to occupants or operating personnel operating safety safety during the time interval when the equipment is operational and which may include the presence of operating personnel and/or any occupants
3.1 .9 failure termination of the ability of an item to perform a required function NOTE – When the term failure is used within a contract in the context of RCM, it should be defined as follows: “A failure is the presence of an unsatisfactory condition which is related to a specific situation and from the perspective of a particular observer.” The particular observer should be defined. 3.1 .1 0 failure cause the circumstances during design, manufacture or use which have led to a failure 3.1 .1 1 failure effect immediate effect of each failure mode on functionally significant items and on the required functions of the item 3.1 .1 2 failure mode one of the possible states of a failed item, for a given required function 3.1 .1 3 fatigue damage (FD) initiation of a crack or cracks due to cyclic loading and subsequent propagation 3.1 .1 4 fatigue related sampling inspections on specific equipment selected from those which have the highest operating age/usage in order to identify the first evidence of deterioration in their condition caused by fatigue damage 3.1 .1 5 function normal characteristic actions of an item 3.1 .1 6 functional check quantitative check to determine if one or more functions of an item performs within specified limits 3.1 .1 7 functional failure failure, the effect of which is that an entity fails to perform one or more of its required functions