Slide background
Slide background

IEC 61882:2016 Examples of HAZOP studies

ID 15472 | | Visite: 5743 | Documenti Riservati ChemicalsPermalink:

Cover 61882 2016   Examples of HAZOP styudies

IEC 61882:2016 Examples of HAZOP studies / CEI EN 61882:2017

ID 15472 | 17.01.2022 / Examples of HAZOP studies Annex B IEC 61882:2016 (CEI 2017)

IEC 61882:2016 Hazard and operability studies (HAZOP studies) - Application guide

L’HAZard and OPerability analysis (HAZOP) è una tecnica (metodologia di Analisi dei Rischi) molto utilizzata in ambienti industriali con tecniche di controllo automatico di processo, in particolare nell'industria chimica.

Il metodo di Analisi di Pericolo e Operabilità (o metodo HAZOP, dall’inglese HAZard and OPerability analysis) ha lo scopo di individuare i rischi presenti in un processo produttivo. Oggi è uno dei metodi più utilizzati per identificare i rischi, in quanto è una procedura molto strutturata che, oltre a individuare eventuali deviazioni dal processo standard, si occupa anche di valutare interventi correttivi e risolutivi.

Nel presente elaborato viene riportato un estratto dell’Allegato B della norma IEC 61882:2016 contenente esempi di applicazione del metodo HAZOP.

IEC 61882:2016 Annex B (informative) 

Examples of HAZOP studies      
B.1 General     
B.2 Introductory example         
B.3 Procedures
B.4 Automatic train protection system  
B.4.1 General   
B.4.2 Application          
B.5 Example involving emergency planning       
B.6 Piezo valve control system  
B.7 HAZOP of a train stabling yard horn procedure           
Figure 1 – The HAZOP study procedure
Figure 2 – Flow chart of the HAZOP examination procedure –   Property first sequence   
Figure 3 – Flow chart of the HAZOP examination procedure – Guide word first sequence 
Figure B.1 – Simple flow sheet 
Figure B.2 – Train-carried ATP equipment        
Figure B.3 – Piezo valve control system
Table 1 – Example of basic guide words and their generic meanings        
Table 2 – Example of guide words relating to clock time and order  or sequence    
Table 3 – Examples of deviations and their associated guide words     
Table B.1 – Properties of the system under examination     
Table B.2 – Example HAZOP worksheet for introductory example   
Table B.3 – Example HAZOP worksheet for procedures example          
Table B.4 – Example HAZOP worksheet for automatic train protection system
Table B.5 – Example HAZOP worksheet for emergency planning
Table B.6 – System design intent
Table B.7 – Example HAZOP worksheet for piezo valve control system
Table B.8 – Operational breakdown matrix for train stabling yard  horn procedure  
Table B.9 – Example HAZOP worksheet for train stabling yard horn procedure

IEC 61882:2016 provides a guide for HAZOP studies of systems using guide words.

This standard describes the principles for and approach to guide word-driven risk identification. Historically this approach to risk identification has been called a hazard and operability study or HAZOP study for short.

This is a structured and systematic technique for examining a defined system, with the objectives of:

- identifying risks associated with the operation and maintenance of the system. The hazards or other risk sources involved can include both those essentially relevant only to the immediate area of the system and those with a much wider sphere of influence, for example some environmental hazards;
- identifying potential operability problems with the system and in particular identifying causes of operational disturbances and production deviations likely to lead to nonconforming products.

An important benefit of HAZOP studies is that the resulting knowledge, obtained by identifying risks and operability problems in a structured and systematic manner, is of great assistance in determining appropriate remedial measures.This second edition cancels and replaces the first edition published in 2001.

This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:
- clarification of terminology as well as alignment with terms and definitions within ISO 31000:2009 and ISO Guide 73:2009;
- addition of an improved case study of a procedural HAZOP. Keywords: HAZOP, risks and operability problems

Pubblication date: 10.03.2016

La norma IEC 61882:2016 (CEI 2017) fornisce una guida per gli studi di sistemi HAZOP che utilizzano parole guida.

Essa fornisce una guida sulla applicazione della tecnica e procedura di studio HAZOP, compresa la definizione, la preparazione, le sessioni d'esame e la documentazione risultante e follow-up.

Sono anche previsti esempi di documentazione, ed una vasta gamma di esempi che comprendono diverse applicazioni, che illustrano gli studi HAZOP.

L’Ed. 2016 costituisce una revisione tecnica della precedente 2001 e include le seguenti modifiche tecniche significative:

- Chiarimento della terminologia, nonché l'allineamento con i termini e le definizioni all'interno di ISO 31000:2009 e ISO Guide 73:2009;
- Aggiunta di un caso di studio migliorato di un HAZOP procedurale.


Annex B (informative)

Examples of HAZOP studies

B.1 General

The purpose of the examples contained in Annex B is to illustrate how the principles of a HAZOP study, outlined in this standard (particularly in 4.2, 6.3 and 6.4) are applied to a range of applications encompassing various industries and activities. It should be noted however that the examples have been simplified significantly for illustrative purposes and do not purport in any way to reproduce all the detailed technical complexity of real case studies. It should also be noted that only sample outputs are provided.

B.2 Introductory example

The purpose of this example is to introduce the reader to the basics of the HAZOP examination method. The example is adopted from one given in the original publication on HAZOP studies.
Consider a simple process plant, shown in Figure B.1. Materials A and B are continuously transferred by pumps from their respective supply tanks to combine and form a product C in the reactor. Suppose that A always has to be in excess of B in the reactor to avoid an explosion hazard. A full design representation would include many other details such as the effect of pressure, reaction and reactant temperature, agitation, reaction time, compatibility of pumps A and B, etc. but for the purposes of this simple illustrative example they will be ignored. The part of the plant being examined is shown in bold

IEC 61882 2016 Examples of HAZOP studies   Figura B1

Figure B.1 - Simple flow sheet

The part of the system selected for examination is the line from the supply tank holding A to the reactor, including pump A (see Table B.1). The design intent for this part is to continuously transfer material A from the tank to the reactor at a rate greater than the transfer rate of material B. In terms of the properties suggested in 4.2, the design intent is given in the previous paragraph of Clause B.2.

Table B.1 - Properties of the system under examination

IEC 61882 2016 Examples of HAZOP studies   Tabella B 1

Each of the guide words indicated in Table 3 (plus any others agreed as  appropriate during  the preparatory work, is then applied to each of these properties in turn and the results recorded on HAZOP worksheets. Examples of possible HAZOP outputs are indicated  in Table B.2, where the 'by exception' style of reporting is utilized and only meaningful deviations are recorded. Having examined each of the guide words for each of the properties relevant to this part of the system, another part (say the transfer line for material B) would be selected and the process repeated. Eventually all parts of the system would be examined in this manner and the results recorded.


Table B.2 – Example HAZOP worksheet for introductory example

IEC 61882 2016 Examples of HAZOP studies   Tabella B 2

IEC 61882 2016 Examples of HAZOP studies   Tabella B 2 1


Table B.3 – Example HAZOP worksheet for procedures example

IEC 61882 2016 Examples of HAZOP studies   Tabella B 3

IEC 61882 2016 Examples of HAZOP studies   Tabella B 3 1

[...] Segue in allegato

Certifico Srl - EN | Rev. 0.0 2022
©Copia autorizzata Abbonati 

Fonte: IEC 61882:2016: HAZOP


Descrizione Livello Dimensione Downloads
Allegato riservato IEC 61882 2016 Examples of HAZOP studies Rev. 0.0 2022.pdf
Certifico Srl - Rev. 0.0 2022
548 kB 94

Tags: Chemicals Rischio Incidente Rilevante Abbonati Chemicals

Articoli correlati

Ultimi archiviati Chemicals

Giu 08, 2024 108

Decreto 19 dicembre 2023

Decreto 19 dicembre 2023 Proroga dei regimi sperimentali dell'indicazione di origine da riportare nell'etichetta degli alimenti. (GU n.131 del 06.06.2024)_________ Art. 2. Termine finale di efficacia del regime sperimentale 1. È fissato al 31 dicembre 2024 il termine finale di efficacia del regime… Leggi tutto
REACH Authorisation List
Giu 08, 2024 206

REACH Authorisation Decisions List / Last update: 07.06.2024

REACH Authorisation Decisions List / Last update: 07.06.2024 ID 22017 | Last update: 07.06.2024 REACH Authorisation Decisions List of authorisation decisions adopted on the basis of Article 64 of Regulation (EC) No 1907/2006 (REACH). The list also includes reference to related documentation… Leggi tutto
Giu 05, 2024 667

Piano nazionale di controllo ufficiale presenza OGM negli alimenti - 2022

Piano nazionale di controllo ufficiale sulla presenza di organismi geneticamente modificati (OGM) alimenti - 2022 ID 21996 | 05.06.2024 / In allegato Con l’anno 2022 si conclude il triennio della programmazione del piano nazionale di controllo ufficiale per ricercare la presenza di OGM negli… Leggi tutto
ECHA Annual report 2023
Mag 28, 2024 493

ECHA Annual report 2023

ECHA Annual report 2023 ID 21942 | 28.05.2024 With 2023 the last year of our strategic plan 2019-2023, we concluded the delivery of our strategic objectives and performed the planned activities specified in our Work Programme. This year also saw us commence work on implementation of the new… Leggi tutto
Safe and sustainable by design chemicals and materials
Mag 27, 2024 573

Safe and sustainable by design chemicals and materials - Methodological guidance

Safe and sustainable by design chemicals and materials - Methodological guidance ID 21936 | 27.05.2024 This Methodological Guidance clarifies some aspects of the voluntary application of the ‘safe and sustainable by design’ (SSbD) framework for chemicals and materials. It combines the disciplines… Leggi tutto
Decreto 10 maggio 2024   Proroga principio attivo Indoxacarb
Mag 22, 2024 120

Decreto 10 maggio 2024 / Proroga principio attivo Indoxacarb

Decreto 10 maggio 2024 / Proroga al 31.01.2026 principio attivo Indoxacarb ID 21909 | 22.05.2024 Decreto 10 maggio 2024 - Proroga al 31 dicembre 2026 della scadenza delle autorizzazioni all'immissione in commercio rilasciate dal Ministero della salute per i biocidi appartenenti alla categoria 18 e… Leggi tutto

Più letti Chemicals

Regolamento  CE  n  178 2002
Ott 24, 2022 108801

Regolamento (CE) N. 178/2002

Regolamento (CE) n. 178/2002 Regolamento (CE) n. 178/2002 del Parlamento europeo e del Consiglio del 28 gennaio 2002 che stabilisce i principi e i requisiti generali della legislazione alimentare, istituisce l'Autorità europea per la sicurezza alimentare e fissa procedure nel campo della sicurezza… Leggi tutto
Notifica HACCP
Apr 05, 2022 74660

Notifica ai fini registrazione Regolamento CE n. 852/2004

Notifica ai fini della registrazione (Reg. CE n. 852/2004) - Ex notifica sanitaria alimentare ID 7901 | 06.03.2019 / Modello notifica allegato [panel]Regolamento (CE) 852/2004...Articolo 6 Controlli ufficiali, registrazione e riconoscimento 1. Gli operatori del settore alimentare collaborano con le… Leggi tutto