IEC 61882 pdf download.Hazard and operability studies (HAZOP studies) – Application guide
1 Scope
This International Standard provides a guide for HAZOP studies of systems using guide words. It gives guidance on application of the technique and on the HAZOP study procedure, including definition, preparation, examination sessions and resulting documentation and follow-up. Documentation examples, as well as a broad set of examples encompassing various applications, illustrating HAZOP studies are also provided.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-1 92, International electrotechnical vocabulary – Part 192: Dependability (available at http://www.electropedia.org)
3 Terms, definitions and abbreviations
3.1 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-1 92 and the following apply. NOTE Within this clause, the terms defined are in italic type. 3.1 .1 characteristic qualitative or quantitative property EXAMPLE Pressure, temperature, voltage. 3.1 .2 consequence outcome of an event affecting objectives Note 1 to entry: An event can lead to a range of consequences. Note 2 to entry: A consequence can be certain or uncertain and can have positive or negative effects on objectives. Note 3 to entry: Consequences can be expressed qualitatively or quantitatively. Note 4 to entry: Initial consequences can escalate through knock-on effects. [SOURCE: ISO Guide 73:2009, 3.6.1 .3]3.1 .3 control measure that is modifying risk (3.1 .1 2) Note 1 to entry: Controls include any process, policy, device, practice, or other actions which modify risk. Note 2 to entry: Controls may not always exert the intended or assumed modifying effect. [SOURCE: ISO Guide 73:2009, 3.8.1 .1 ] 3.1 .4 design intent designer’s desired, or specified range of behaviour for properties which ensure that the item fulfills its requirements 3.1 .5 property constituent of a part which serves to identify the part’s essential features Note 1 to entry: The choice of properties can depend upon the particular application, but properties can include features such as the material involved, the activity being carried out, the equipment employed, etc. Material should be considered in a general sense and includes data, software, etc. 3.1 .6 guide word word or phrase which expresses and defines a specific type of deviation from a property’s design intent 3.1 .7 harm physical injury or damage to the health of people or damage to assets or the environment 3.1 .8 hazard source of potential harm (3.1 .7) Note 1 to entry: Hazard can be a risk source (3.1 .1 4). [SOURCE: ISO Guide 73:2009, 3.5.1 .4] 3.1 .9 level of risk magnitude of a risk (3.1 .1 2) or combination of risks, expressed in terms of the combination of consequences (3.1 .2) and their likelihood [SOURCE: ISO Guide 73:2009, 3.6.1 .8] 3.1 .1 0 manager person with responsibility for a project, activity or organization. 3.1 .1 1 part section of the system which is the subject of immediate study Note 1 to entry: A part can be physical (e.g. hardware) or logical (e.g. step in an operational sequence). 3.1 .1 2 risk effect of uncertainty on objectives Note 1 to entry: An effect is a deviation from the expected – positive and/or negative. Note 2 to entry: Objectives can have different aspects (such as financial, health and safety, and environmental goals) and can apply at different levels (such as strategic, organization-wide, project, product and process). Note 3 to entry: Risk is often characterized by reference to potential events and consequences (3.1 .2) or a combination of these. Note 4 to entry: Risk is often expressed in terms of a combination of the consequences of an event (including changes in circumstances) and the associated likelihood of occurrence. Note 5 to entry: Uncertainty is the state, even partial, or deficiency of information related to, understanding or knowledge of an event, its consequence, or likelihood. [SOURCE: ISO Guide 73:2009, 1 .1 ] 3.1 .13 risk identification process of finding, recognizing and describing risks (3.1 .1 2) Note 1 to entry: Risk identification involves the identification of risk sources (3.1 .1 4), events, their causes and their potential consequences (3.1 .2). Note 2 to entry: Risk identification can involve historical data, theoretical analysis, informed and expert opinions, and stakeholder’s needs. [SOURCE: ISO Guide 73:2009, 3.5.1 ] 3.1 .1 4 risk source element which alone or in combination has the intrinsic potential to give rise to risk (3.1 .1 2) Note 1 to entry: A risk source can be tangible or intangible. [SOURCE: ISO Guide 73:2009, 3.5.1 .2] 3.1 .15 risk treatment process to modify risk (3.1 .1 2) Note 1 to entry: Risk treatment can involve: – avoiding the risk by deciding not to start or continue with the activity that gives rise to the risk; – taking or increasing risk in order to pursue an opportunity; – removing the risk source (3.1 .1 4); – changing the likelihood; – changing the consequences (3.1 .2); – sharing the risk with another party or parties (including contracts and risk financing); and – retaining the risk by informed decision.
IEC 61882 pdf download
