oSIST prEN 17975:2023
(Main)Maintenance - Energies and fluids risks control process for maintenance tasks - Guidance
Maintenance - Energies and fluids risks control process for maintenance tasks - Guidance
The objective is to provide users with a set of requirements that help prevent risks related to energies during maintenance operations on plants when in use. It is up to each employer, according to the terms commonly used in the company, to:
— Set out the correlation between the processes described in this document and standard practices;
— Define the roles and responsibilities of the people involved in the energy lockout processes.
The document will refer to concepts, definitions, rules, recommendations and best practices taken from national and international documents (lockout/tagout– “administrative lockout” – Lockout/Tagout (LOTO) – Safe isolation) that cover operations to ensure the occupational safety as regards energies.
The document will cover the prevention of risks related to energies, without replacing existing standards (e.g. Operations on electrical network and installations and in an electrical environment - Electrical risk prevention French standard NF C18-510).
The requirements that will be stated in this document will be drawn up with a view to ensuring the safety of workers with regard to hazardous energies and situations when they are conducting maintenance actions, settings, changing formats, regardless of the type of activity.
They mainly relate to operations carried out on plants. However it is a transversal cross-sector standard, that relates to maintenance activities and all assets are concerned. They are applied before, during and after the operation to the energies supplied, contained, transported or released by plants, products and fluids;
As focused on maintenance activities, all the life cycle of the assets will not be addressed. Design and end-of-life phases will not be included in the scope at this step. Other subjects not specifically related to maintenance as dismantling of items (plants, equipment, etc.), better account taken of energies control from maintainability and maintenance during design phase, are not included in the scope
Wartung - Kontrolle Risiken in Bezug auf Energien und Flüssigkeiten während der Wartungsarbeiten
Dieses Dokument enthält einen Leitfaden für die Anwender, der dazu beiträgt, Risiken im Zusammenhang mit Energien bei Instandhaltungsarbeiten an in Betrieb befindlichen Anlagen zu vermeiden. Entsprechend den im Unternehmen üblicherweise verwendeten Begriffen obliegt es jedem Arbeitgeber,
- die Übersteinstimmung zwischen den in diesem Dokument beschriebenen Prozessen und den üblichen Vorgehensweisen zu bestimmen;
- die Aufgaben und Verantwortlichkeiten der an dem Energie Lockout Prozess beteiligten Personen festzulegen.
Dieses Dokument bezieht sich auf Konzepte, Definitionen, Regeln, Empfehlungen und bewährte Vorgehensweisen aus nationalen und internationalen Dokumenten (Lockout/Tagout - "Organisation des Lockouts" - Lockout/Tagout (LOTO) - sichere Isolierung), die Vorgänge zur Gewährleistung der Arbeitssicherheit in Bezug auf Energien abdecken.
Dieses Dokument befasst sich mit der Vorbeugung von Risiken, die mit Energien und Fluiden (Pulver, Gase, Flüssigkeiten) in Zusammenhang stehen; es ist anzumerken, dass einige davon, wie beispielsweise elektrische Risiken, Gegenstand spezifischer Vorschriften oder Normen sind. Mit Energien und Fluiden in Zusammenhang stehende Umweltfragen fallen nicht in den Anwendungsbereich dieses Dokumentes.
Die in diesem Dokument gegebenen Empfehlungen wurden mit dem Ziel erarbeitet, die Sicherheit und Gesundheit von Arbeitnehmern in der Nähe von gefährlichen Energien und Fluiden sowie in Situationen sicherzustellen, in denen sie Instandhaltungs , Einstellungs und Formatwechselarbeiten durchführen, unabhängig von der Art der Tätigkeit.
Die Empfehlungen beziehen sich auf Tätigkeiten, die an Objekten durchgeführt werden. Sie werden vor, während und nach den Arbeiten in Hinblick auf Folgendes angewendet:
- die von Anlagen, Produkten und Fluiden zugeführten, enthaltenen, transportierten oder freigesetzten Energien;
- Risiken eines Mangels an lebenswichtigen Elementen für den Arbeitnehmer (Atemluft);
- Risiken für den Arbeitnehmer und das Personal in der Umgebung in Zusammenhang mit gefährlichen Fluiden.
Bei diesem Dokument handelt es sich um einen methodischen Leitfaden im Rahmen des normativen Korpus der Instandhaltung.
Maintenance - Maîtrise des risques liés aux énergies et fluides lors des opérations de maintenance
Le présent document fournit aux utilisateurs des recommandations visant à se prémunir des risques liés aux énergies, lors des opérations de maintenance sur des installations en cours d’utilisation. En fonction de la terminologie couramment utilisée dans l’entreprise, il appartient à chaque employeur :
— d’établir la corrélation entre les processus décrits dans le présent document et les pratiques usuelles ;
— de définir les fonctions et responsabilités des personnes impliquées dans les processus de mise en sécurité des énergies.
Le présent document se réfère à des concepts, des définitions, des règles, des recommandations et des bonnes pratiques issus de documents nationaux et internationaux (consignation — « condamnation administrative » — LOTO (condamnation/signalisation) — isolation sûre) qui traitent des opérations de mise en sécurité des intervenants vis‐à‐vis des énergies.
Le présent document traite de la prévention des risques liés aux énergies et aux fluides (poudres, gaz et liquides) ; il faut noter que certains risques, tels que le risque électrique, sont couverts par des réglementations ou des normes spécifiques. Les enjeux environnementaux liés aux énergies et aux fluides n’entrent pas dans le domaine d’application du présent document.
Les recommandations spécifiées dans le présent document ont été rédigées dans le but d’assurer la sécurité et de protéger la santé des intervenants évoluant à proximité d’énergies et de fluides dangereux, ainsi que dans les situations où ils effectuent des opérations de maintenance, de réglage, de changement de formats, quelle que soit la nature des activités.
Les recommandations portent sur les opérations réalisées sur des biens. Elles s’appliquent avant, pendant et après l’opération :
— aux énergies fournies, contenues, transportées ou libérées par des installations, des produits et des fluides ;
— aux risques d’absence d’éléments vitaux pour l’intervenant (air respirable) ;
— aux risques liés à la présence de substances dangereuses pour l’intervenant et le personnel évoluant à proximité.
Le présent document est un guide méthodologique entrant dans le corpus des normes de maintenance.
Vzdrževanje - Proces nadzora tveganj, povezanih z energijami in fluidi, pri vzdrževalnih opravilih - Napotki
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 17975:2023
01-maj-2023
Vzdrževanje - Proces nadzora tveganj, povezanih z energijami in fluidi, pri
vzdrževalnih opravilih - Napotki
Maintenance - Energies and fluids risks control process for maintenance tasks -
Guidance
Wartung - Kontrolle Risiken in Bezug auf Energien und Flüssigkeiten während der
Wartungsarbeiten
Maintenance - Maîtrise des risques liés aux énergies et fluides lors des opérations de
maintenance
Ta slovenski standard je istoveten z: prEN 17975
ICS:
03.080.10 Vzdrževalne storitve. Maintenance services.
Upravljanje objektov Facilities management
13.100 Varnost pri delu. Industrijska Occupational safety.
higiena Industrial hygiene
oSIST prEN 17975:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17975:2023
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oSIST prEN 17975:2023
DRAFT
EUROPEAN STANDARD
prEN 17975
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2023
ICS 03.080.10; 13.100
English Version
Maintenance - Energies and fluids risks control process for
maintenance tasks - Guidance
Maintenance - Maîtrise des risques liés aux énergies et Wartung - Kontrolle Risiken in Bezug auf Energien und
fluides lors des opérations de maintenance Flüssigkeiten während der Wartungsarbeiten
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 319.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17975:2023 E
worldwide for CEN national Members.
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Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.1 Terms and definitions related to plants and activities . 8
3.2 Terms and definitions related to energies and energy lockout . 8
3.3 Terms and definitions related to risks and hazardous phenomena . 11
3.4 Terms and definitions related to organization . 11
3.5 Terms and definitions related to people . 12
4 Links between securing energies and maintenance processes . 14
4.1 Boundaries and interfaces. 14
4.2 Place of securing energies and fluids within maintenance processes . 14
4.3 Interactions with other safety mitigation in maintenance . 15
4.4 Equipment design and modification . 15
4.5 Relation to severe hazard and emergency response management . 16
4.6 Boundaries between maintenance and operating activities . 16
5 Risk analysis . 18
5.1 General issue: Systematic risk analysis mindset . 18
5.2 Risk analysis methodology when applied to maintenance tasks . 18
5.3 Specificities of risk analyses related to energies and fluids within maintenance tasks
. 19
5.3.1 Maintenance risk control methodology for energies and fluids within maintenance
tasks . 19
5.3.2 Main elements to be considered when analysing maintenance activity . 20
5.3.3 Impact of safety device technology . 21
5.3.4 Effects of items configurations . 21
5.4 Sources of the main hazards to be considered (energy, fluids, products that are
sources of dangerous phenomena) . 22
5.5 Design and methodology for selecting an energy and fluid lockout process . 22
5.5.1 Introduction – energies and fluids risk control process . 22
5.5.2 Process application table . 23
5.5.3 Risk prioritization and mitigation . 25
5.5.4 Selection of processes given existing configurations . 25
5.5.5 Application to degraded (abnormal) situations . 27
5.6 Updating energies and fluids specific risk analysis . 27
5.6.1 Updating the risk analysis during a maintenance activity. 27
5.6.2 Updating the risk analysis before applying Standard Operating Procedures (SOP) . 27
5.7 “Memo” flowchart of risk analysis . 28
6 Energy and fluid lockout processes . 29
6.1 Energy and fluid lockout process . 29
6.1.1 General. 29
6.1.2 Reinforced isolation by lockout/tagout of energies and fluids (RI) . 30
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6.1.3 Standard isolation (by lockout of energies and fluids) . 33
6.1.4 Neutralization of energies and fluids by the control system . 36
6.1.5 Specific provisions for activities involving energies and fluids . 38
6.2 Organizational prerequisites . 41
6.3 Securing steps . 42
6.3.1 Technical steps – Isolation steps flowchart . 42
6.3.2 Means of checking the removal or neutralization of the energies and fluids . 43
6.3.3 Determining the “key points” . 43
6.3.4 Specific case related to the fitting of plugs . 44
6.4 Specific features of “PARENT/CHILD” Energy and fluid lockout . 44
7 Energies and fluids source control . 45
7.1 General . 45
7.2 Energy and fluids source control devices . 46
7.2.1 Type . 46
7.2.2 Location . 47
7.2.3 Identifiers and markers . 47
7.2.4 Maintenance . 47
7.3 Compensatory measures . 48
7.4 LOCKOUT Administration . 49
7.4.1 Principle . 49
7.4.2 Lockout devices . 49
7.4.3 Secure access to handling devices . 50
7.4.4 Procedure for removing locking devices . 50
7.5 USE OF TAGS and LOCKS . 50
7.5.1 Tags memo . 50
7.5.2 Locks management . 51
7.6 Specific features – Design and modification of equipment . 51
7.7 Energies and energy lockout device identification sheet . 51
7.7.1 General . 51
7.7.2 Content . 52
7.7.3 Validation . 52
7.7.4 Updating . 52
7.7.5 Exclusions . 52
8 Organizational provisions . 53
8.1 Organizational provisions . 53
8.2 Quality rules related to energy lockout . 53
8.3 Energies and fluids competences management and training . 53
8.3.1 Warning . 53
8.3.2 Principle . 53
Annex A (informative) Organizational provisions . 55
A.1 Organizational provision . 55
A.2 Organizational quality rules . 58
A.3 Energies and fluids lockout competences, training . 60
A.4 Example: designation of competent people for energy lockout and maintenance
operations . 62
Annex B (informative) Main elements to be considered when analysing maintenance activity
. 64
Annex C (informative) Non-exhaustive list of energy sources and phenomena . 67
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C.1 General. 67
C.2 Energies . 67
C.3 Fluids and products. 69
Annex D (informative) Preparation of energy lockout steps . 71
Annex E (informative) Example of the types of isolation categories for pipes . 73
E.1 Definitions . 73
E.2 Category B types (reinforced isolation). 74
E.3 Category A types (standard isolation) . 77
E.4 Examples of practical diagrams for category B (reinforced isolation) . 78
E.5 Examples of practical diagrams for category A (standard isolation) . 82
Annex F (informative) Mechanical energy lockout . 84
F.1 General. 84
F.2 Gravity-related mechanical risks . 84
F.3 Mechanical risks caused by actuators . 84
F.4 Ventilation-related mechanical risks . 85
F.5 Mechanical risks caused by the effects of arching and walls . 85
Annex G (informative) Specific rules for PARENT/CHILD energies and fluids lockout
processes. 86
G.1 Specific rules for “PARENT/CHILD” . 86
G.2 Removal of a “PARENT” Energy and fluid lockout. 87
G.3 “PARENT/CHILD” Energy and fluid lockout . 87
G.4 “PARENT” energy and fluid lockout . 88
G.5 “CHILD” energy lockout . 89
G.6 Dedicated software management of “PARENT/CHILD” energy lockout . 89
G.7 Management of “PARENT/CHILD” energy lockout without dedicated software . 90
Annex H (informative) Document examples . 91
H.1 Set of document example . 91
H.2 LOTO form model example . 93
H.3 Tag model example . 94
Annex I (informative) Specific case of cryogenic (pipe freezing), expansion or inflatable
plugs. 96
I.1 General. 96
Bibliography . 97
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European foreword
This document (prEN 17975:2023) has been prepared by Technical Committee CEN/TC 319
“Maintenance”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
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Introduction
Many occupational accidents are caused by a failure to manage energy sources during maintenance
activities. These accidents have serious impacts on people, assets and activities.
The safety and health of workers prior to and during maintenance tasks on items involves a series of
practices and procedures aimed at controlling all energy sources. These practices and procedures enable
a worker to be sure that he/she can work on a plant without any accidental energies' reconnection, and
avoid that he/she will be exposed to a hazardous working environment.
Depending on the task, the items and the related risk analysis, the safety of workers is based, according
to the energies, on the individual or combined implementation of the following specific processes:
— Reinforced isolation by lockout/tagout of energies and fluids (RI);
— Standard isolation by lockout of energies and fluids (SI);
— Neutralization of energies and fluids by the control systems (N);
— Specific provisions for activities involving energies and fluids (SP).
On its own, reinforced isolation by lockout/tagout of energies ensures the full protection of workers.
However, the design of existing plants or the type of operations does not always enable such an approach
to be applied, which therefore imposes use of one of the three alternative processes set out below.
Various industrial sectors – chemical, metallurgy, agrifood, energy production and power distribution –
have adopted “energy lockout” terminologies for many years, according to their industrial context. Each
industry has defined a formal system for risk analysis and operating procedures for securing each of the
energies it works with. Depending on the various sectors, the terms used for “energy lockout” include
reinforced lockout/tagout, standard lockout/tagout, lockout of released energies, LOTO - Lock Out, Tag
Out, LOTOTO - Lock Out, Tag Out, Try Out (see OSHA 1910.147), “administrative lockout”, etc.
This standard is therefore concerned with how to best control the risks related to energies and fluids
linked to maintenance activities.
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1 Scope
This document provides users with guidance that help prevent risks related to energies during
maintenance activities on plants when in use. It is up to each employer, according to the terms commonly
used in the company, to:
— Set out the correlation between the processes described in this document and standard practices;
— Define the roles and responsibilities of the people involved in the energy lockout process.
This document refers to concepts, definitions, rules, recommendations and best practices taken from
national and international documents (lockout/tagout– “administrative lockout” – Lockout/Tagout
(LOTO) – Safe isolation) that cover activities to ensure the safety of worker as regards energies.
This document deals with the prevention of energies and fluids (powders, gases, liquids) related risks; it
is noted that some are covered by specific regulations or standards, such as the electrical risk.
Environmental issues related to energies and fluids are not in the scope of this document.
The recommendations stated in this document have been drawn up with a view to ensure the safety and
health of workers around hazardous energies and fluids, and situations when they are conducting
activities on maintenance, settings, changing formats, regardless of the type of activity.
The recommendations relate to activities carried out on items. They are applied before, during and after
the operation to:
— The energies supplied, contained, transported or released by plants, products and fluids;
— Risks of lack of presence of vital elements for the worker (breathable air);
— Risks related to the presence of hazardous fluids for the worker and the surrounding personal.
This document is a methodological guideline within the normative maintenance corpus.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13306, Maintenance — Maintenance terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13306 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
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3.1 Terms and definitions related to plants and activities
3.1.1
item
part, component, device, subsystem, functional unit, equipment or system that can be individually
described and considered
Note 1 to entry: In the context of this standard, we consider installations, processes, machinery and working
equipment as plants.
[SOURCE: EN 13306:2017, 3.1, modified – modification of note to entry 1 and removal of notes to entry
2 and 3]
3.1.2
plant
set of items constituting installations, processes, machinery and working equipment
3.1.3
release
authorisation for a temporary transfer of responsibility from the operating officer to the operation
manager within the scope indicated in the release document
Note 1 to entry: The release, for works, testing, etc. is an authorization given to a works officer, test officer, etc. in
order to work on disabled plants or plants in use.
3.2 Terms and definitions related to energies and energy lockout
3.2.1
energies supplied to items
energies supplied to the plants by external sources and which are necessary for their operation
3.2.2
contained energies
internal, stored, residual or converted energies
3.2.3
lock-out-tag-out
LOTO
placement of a lockout device on an energy isolating device, in accordance with an established
procedure, ensuring that the energy isolating device and the equipment being controlled cannot be
operated until the lockout device is removed
placement of a tagout device on an energy isolating device, in accordance with an established
procedure, to indicate that the energy isolating device and the equipment being controlled may not be
operated until the tagout device is removed
[SOURCE: OSHA-control of hazardous energy - CPL_02-00-147]
3.2.4
lock-out-tag-out-try-out
LOTOTO
LOTO improvement including a phase of verification of absence of energy (Try-Out) before the
intervention
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3.2.5
process
set of interrelated or interacting activities that use inputs to deliver an intended result
[SOURCE: EN ISO 9000:2015, 3.4.1]
3.2.6
energy lockout
all of the activities carried out and measures taken in relation to energies, hazardous products or the lack
of vital elements that ensure the safety of maintenance workers during their activities on or near to
plants, or within their working environment
Note 1 to entry: Securing may combine various processes that are specific to each energy listed in this document,
through:
— Reinforced isolation by lockout/tagout of energies and fluids (RI);
— Standard isolation by lockout of energies and fluids (SI);
— Neutralization of energies and fluids by the control systems (N);
— Specific provisions for activities involving energies and fluids (SP).
In additional to the processes listed above, collective and individual protections or organizational measures
(procedures, requirements, working methods, permits-to-work, etc.) enable the maintenance worker to carry out
activities whilst controlling the risks.
Note 2 to entry: See the list of energies in section 5 “Energy sources and phenomena”.
3.2.7
reinforced isolation by lockout/tagout of energies
RI
process that results in the removal – by separation or by a combination of isolating and opening devices
(e.g. valve, tap, etc.) – of all energies where the presence, accidental retention, unintended appearance or
appearance has hazardous consequences for workers, the environment and plants
Note 1 to entry: Depending on the energies present, bleed, discharge, release, clean-up or mechanical blocking
activities may be necessary.
Note 2 to entry: The RI process involves all of the activities and provisions that enable a plant to be secured and
kept secure, so that the workers may conduct their maintenance activities.
3.2.8
standard isolation by lockout of energies
SI
process that results in the removal – by locking in position a single or double isolating device – of all
energies where the presence, accidental retention, unintended appearance or appearance does not have
hazardous consequences for workers, the environment and plants
Note 1 to entry: Depending on the energies present, bleed, discharge or release activities may be necessary.
Note 2 to entry: The SI process involves all of the activities and provisions that enable a plant to be sec
...
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