SIST-TP CEN/TR 14489:2006
(Main)Fire-resistant hydraulic fluids - Classification and specification - Guidelines on selection for the protection of safety, health and the environment
Fire-resistant hydraulic fluids - Classification and specification - Guidelines on selection for the protection of safety, health and the environment
This Technical Report gives guidance on the achievement of compliance with Essential Health and Safety Requirements (EHSR) by the selection of fire-resistant fluids or by other means. It includes consideration of the selection of fluids with lower levels of fire resistance and of mineral oil, with appropriate additional safety measures, where this option may be considered to be most satisfactory during operation.
This Technical Report is concerned with assessing the fire resistance, health properties and effects on the environment, but does not cover requirements for their general physical and chemical properties, which are detailed in EN ISO 12922.
Schwer entflammbare Druckflüssigkeiten - Klassifikation und Spezifikation - Auswahlleitlinien zur Wahrung der Sicherheit, der Gesundheit und des Umweltschutzes
Dieser Technische Bericht enthält Leitlinien zur Erfüllung der Essential Health and Safety Requirements (EHSR's) durch die Auswahl von schwer entflammbaren Flüssigkeiten oder durch andere Maßnahmen. Er berücksichtigt auch die Auswahl von Flüssigkeiten mit geringeren Ansprüchen an Schwerentflammbarkeit und von Mineralölen, und zwar mit entsprechenden zusätzlichen Sicherheitsvorkehrungen, falls dies als die bestmögliche Betriebsart angegeben wird.
Dieser Technische Bericht befasst sich mit Eigenschaften von Schwerentflammbarkeit, mit Gesundheitsschutz und mit Auswirkungen auf die Umwelt, sie betrifft nicht allgemeine physikalische und chemische Eigenschaften, die detailliert in EN ISO 12922 aufgeführt sind.
Fluides difficilement inflammables - Classification et spécification - Principes directeurs de sélection de fluides et de considération des risques de sécurité et d'environnement
Le présent rapport technique donne des lignes directrices pour satisfaire aux exigences essentielles d'hygiene et
de sécurité (EEHS), soit par le choix de fluides difficilement inflammables, soit par d'autres moyens. Ces moyens
comprennent le choix éventuel de fluides de moindre résistance a l'inflammation ou d'huiles minérales, ainsi que
l'adoption conjointe de mesures de sécurité supplémentaires, lorsque cela s'avere plus satisfaisant lors de la
marche des équipements.
Le présent rapport technique s'intéresse a la résistance a l'inflammation, aux risques pour la santé et a l'impact sur
l'environnement des fluides hydrauliques. Il ne traite pas de leurs propriétés physiques et chimiques générales qui
sont précisées dans l'EN ISO 12922.
Hidravlične tekočine, odporne proti ognju – Razvrstitev in specifikacija – Smernice za izbiro varovanja varnosti, zdravja in okolja
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST-TP CEN/TR 14489:2006
01-januar-2006
+LGUDYOLþQHWHNRþLQHRGSRUQHSURWLRJQMX±5D]YUVWLWHYLQVSHFLILNDFLMD±6PHUQLFH
]DL]ELURYDURYDQMDYDUQRVWL]GUDYMDLQRNROMD
Fire-resistant hydraulic fluids - Classification and specification - Guidelines on selection
for the protection of safety, health and the environment
Schwer entflammbare Druckflüssigkeiten - Klassifikation und Spezifikation -
Auswahlleitlinien zur Wahrung der Sicherheit, der Gesundheit und des Umweltschutzes
Fluides difficilement inflammables - Classification et spécification - Principes directeurs
de sélection de fluides et de considération des risques de sécurité et d'environnement
Ta slovenski standard je istoveten z: CEN/TR 14489:2005
ICS:
75.120 +LGUDYOLþQLIOXLGL Hydraulic fluids
SIST-TP CEN/TR 14489:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST-TP CEN/TR 14489:2006
TECHNICAL REPORT
CEN/TR 14489
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
October 2005
ICS 75.120
English Version
Fire-resistant hydraulic fluids - Classification and specification -
Guidelines on selection for the protection of safety, health and
the environment
Fluides difficilement inflammables - Classification et Schwerentflammbare Druckflüssigkeiten - Klassifikation
spécification - Principes directeurs de sélection de fluides und Spezifikation - Auswahlrichtlinien ur Gewährleistung
et de considération des risques de sécurité et von Sicherheit, Gesundheit und Umweltschutz
d'environnement
This Technical Report was approved by CEN on 24 September 2005. It has been drawn up by the Technical Committee CEN/TC 19.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 14489:2005: E
worldwide for CEN national Members.
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Contents Page
Foreword .3
Introduction.4
1 Scope .5
2 Normative references .5
3 Terms and definitions.5
4 General requirements .6
5 Classification of fire-resistant fluids .7
6 Compliance with essential health and safety requirements (EHSR).8
7 Hazard identification.10
8 Risk estimation .13
9 Hazard control measures .14
10 Continuity of properties .16
Annex A (informative) Examples for local regulations applying to the approval and use of
hydraulic fluids .17
Annex B (informative) Fire-resistance tests and guidance on performance.18
Annex C (informative) Examples of fire risk assessment procedures for hydraulic fluids .22
Annex D (informative) Tests suitable for monitoring the condition of hydraulic fluids in service.35
Bibliography.37
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Foreword
This CEN Technical Report (CEN/TR 14489:2005) has been prepared by Technical Committee CEN/TC 19
“Petroleum products, lubricants and related products”, the secretariat of which is held by NEN.
This document has been prepared under mandate M/238 given to CEN by the European Commission and the
European Free Trade Association along with other standards on fire-resistant hydraulic fluids to be
complementary to the regulatory measures contained in various EU Directives.
The mandated work of CEN/TC 19 is to develop European Standards for specifications and testing conditions
applicable to fire-resistant hydraulic fluids.
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Introduction
The function of this Technical Report is to provide suppliers and users of equipment guidance on how
compliance with the essential health and safety requirements (EHSR's) incorporated in both Product (Article
95) and User (Article 137/138) Directives issued by the European Union may be achieved in respect of the
use of fire-resistant hydraulic fluids. It builds upon the guidance provided in EN 1050 on the principles of risk
assessment. EN 1050 in turn supports Directive 92/104/EEC [1].
The document was considered necessary because the specialised nature of fire-resistant fluids and the tests
used to quantify their properties may not in general be familiar to prospective machinery manufacturers and
users. Because several Directives deal with the prevention of fire it is necessary to consider other aspects in
addition to the tests used to quantify fire properties.
The use of fire-resistant hydraulic fluids is a fire protection measure. A fire occurs if combustible materials or
explosive gases, oxygen and an ignition source are all present at the same time. If there is a danger of an
ignition source being present when hydraulic installations are in use, one method of improving safety may be
to replace more combustible mineral oil by a fire-resistant hydraulic fluid. Fire-resistant fluids provide fire
protection. Their use, however, shall not jeopardise other safety measures as, in addition to requirements for
fire resistance, there are additionally requirements for assessing effects on the health of workers and,
increasingly, on potential effects on the environment. Guidance on the information needed is contained in this
Technical Report.
IMPORTANT — This document does not purport to address all of the safety problems associated with
the use of hydraulic systems. It is concerned with the use of fire-resistant fluids as a means of
reducing the risk of fire. It is the responsibility of the user of this document to establish appropriate
safety and health practices to reduce other safety risks and to determine the applicability of regulatory
regimes.
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1 Scope
This Technical Report gives guidance on the achievement of compliance with Essential Health and Safety
Requirements (EHSR) by the selection of fire-resistant fluids or by other means. It includes consideration of
the selection of fluids with lower levels of fire resistance and of mineral oil, with appropriate additional safety
measures, where this option may be considered to be most satisfactory during operation.
This Technical Report is concerned with assessing the fire resistance, health properties and effects on the
environment, but does not cover requirements for their general physical and chemical properties, which are
detailed in EN ISO 12922.
2 Normative references
The following referenced documents are indispensable for the application 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 1050:1996, Safety of machinery - Principles for risk assessment.
EN ISO 2592, Determination of flash and fire points – Cleveland open cup method (ISO 2592:2000).
EN ISO 6743-4, Lubricants, industrial oils and related products (class L) – Classification – Part 4: Family H
(Hydraulic systems) (ISO 6743-4:1999).
EN ISO 12922, Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) -
Specifications for categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:1999, including
Technical Corrigendum 1:2001)).
EN ISO 14935, Petroleum and related products – Determination of wick flame persistence of fire-resistant
fluids (ISO 14935:1998).
ISO 3448, Industrial liquid lubricants - ISO viscosity classification.
ISO 7745, Hydraulic fluid power – Fire-resistant (FR) fluids – Guidelines for use.
3 Terms and definitions
For the purposes of this Technical Report, the following terms and definitions apply.
3.1
safety
freedom from unacceptable risk
[ISO/IEC Guide 51:1999]
3.2
risk
combination of the probability of occurrence of harm and the severity of that harm
[ISO/IEC Guide 51:1999]
3.3
harm
physical injury or damage to the health of people, or damage to property or the environment
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[ISO/IEC Guide 51:1999]
3.4
hazard
potential source of harm
[ISO/IEC Guide 51:1999]
3.5
hazardous event
event that can cause harm
3.6
safety measure
means that eliminates a hazard or reduces a risk
3.7
risk assessment
overall process comprising a risk analysis and a risk evaluation
[ISO/IEC Guide 51:1999]
3.8
risk analysis
systematic use of available information to identify hazards and to estimate the risk
[ISO/IEC Guide 51:1999]
3.9
risk evaluation
procedure based on the risk analysis to determine whether the tolerable risk has been achieved
[ISO/IEC Guide 51:1999]
3.10
environmental properties
chemical or physical properties of a hydraulic fluid which may interact with the environment
3.11
fire resistance
ability of a fluid to fulfil an expected duty in standard fire resistance tests
3.12
fire-resistant
having the property of fire resistance according to one or more standard test methods
4 General requirements
In circumstances where it is necessary to use hydraulic fluids, an assessment is needed as to whether fire-
resistant fluids may be the best option for reducing the risk of fire starting and spreading. Where fire-resistant
fluids are chosen they shall make an overall contribution towards improving safety. Hence they shall not only
meet requirements for fire resistance but also for the protection of the health of workers and the environment
and, shall not jeopardise other safety measures that may be in use. The primary reason for selecting fire-
resistant fluids is to protect against the risk of fire: protection of the environment may be achieved by methods
other than the properties of the fluids.
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In some countries in the European Union (EU) and European Free Trade Association (EFTA) governments
operate approval schemes for hydraulic fluids or impose local regulations, which require that particular levels
of performance be met in specific tests to allow fluids to be used in certain industrial situations (see Annex A).
Compliance with these schemes and regulations is considered by the regulatory authorities in those countries
to constitute compliance with the appropriate EU Directives for the application of hydraulic fluids. It should be
noted that such regulations take precedence over CEN standards, and potential suppliers and users of
hydraulic fluids should establish whether approval schemes or local regulations exist.
Annex A contains a list of the countries that operate approval schemes for hydraulic fluids or impose local
regulations.
Fire-resistant hydraulic fluids shall conform to the specifications laid down for the various industries by the
European Authorities and/or the certification authorities of each member state according to the risks arising in
each industry, distinguishing if necessary between installations giving rise to greater or lesser hazards.
Certification shall be carried out with reference to the specifications and standards issued by the European or
national authorities and should be based on the tests contained in Annex B and C of this Technical Report.
5 Classification of fire-resistant fluids
Table 1 lists the main categories of fire-resistant fluids as found in EN ISO 6743-4, their compositions and
applications.
Fire-resistant fluids in accordance with EN ISO 6743-4 are hydraulic fluids which are classified as fire-resistant
in accordance with particular fire test procedures. They achieve their fire resistance either because they
contain water or because their chemical composition confers fire resistance. Only water and fire-resistant
fluids of type HFA with water content above 90 % are considered to be non-combustible. Fire-resistant fluids
do, however, require a substantially greater input of energy to cause ignition than conventional mineral oil
hydraulic fluids and may not sustain combustion after leaving the ignition source.
The level of fire resistance shall be established by the use of a range of standard protocols (for guidance see
Annex B). In the event that a test representing the particular circumstance of use is not included in
EN ISO 12922 then data from other fire-resistance tests having adequate precision may be invoked, subject to
local regulations.
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Table 1 — Categories of fire-resistant fluids, their compositions and applications according to
EN ISO 6743-4
a
Type Composition Typical applications and operating
b
temperature range
Symbol
e
1. AQUEOUS FLUIDS
b
HFAE Oil-in-water emulsions. Emulsifying oil Hydraulic systems in continuous
content less than 20 % by mass and casting plant, mine roof supports.
typically in the range 1 % to 5 % by
Operating temperature range 5 °C to
mass.
50 °C.
c
HFAS Chemical solutions in water. Hydraulic systems in continuous
Concentrate content less than 20 % casting plant, mine roof supports.
by mass and typically 1 % to 5 % by
Operating temperature range 5 °C to
mass.
50 °C.
HFB Water-in-oil emulsions. Mineral oil Hydrostatic systems in coal mines.
content approximately 60 % by mass,
and Operating temperature range 5 °C to
“LT” designation indicates emulsions
50 °C.
that are stable at low temperatures
HFB LT
HFC Water polymer solutions. Water Hydrostatic systems in steel plant and
content not less than 35 % by mass coal mines.
Operating temperature range –20 °C
to 50 °C.
2. ANHYDROUS FLUIDS
HFDR Synthetic fluids containing no water Hydrodynamic couplings, operating
and consisting of phosphate esters temperature up to 150 °C and
hydrostatic transmissions, operating
temperature range –20 °C to 70 °C.
d
HFDU Synthetic fluids containing no water Hydrostatic transmissions operating
and of other composition temperature range –20 °C to 70 °C.
a
Viscosity grade according to ISO 3448. The viscosity grades most commonly encountered are 32, 46, 68 and 100.
b
See ISO 7745 for additional information.
c
The viscosity of HFAE and HFAS fluids that contain 95 % or more of water is very close to that of water and is usually
not measured. These fluids are given the viscosity 1.
d
Fluids that fall within the HFDU category are defined imprecisely with respect to their chemical compositions. The most
widely used group of fluids that currently fall within this classification are the synthetic esters.
e
Water-containing fluids should not be used when processing magnesium, as explosive gases maybe formed.
6 Compliance with essential health and safety requirements (EHSR)
6.1 General
Where national approval schemes or local regulations exist (Annex A) and where compliance with these
schemes or regulations is considered by the regulatory authorities to constitute compliance with the
appropriate EHSR’s given in EU Directives for the application of the hydraulic fluid, suppliers and users shall
ensure that hydraulic fluids are submitted to the appropriate bodies for certification.
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Where approval schemes or local regulations do not exist or where compliance with them does not constitute
compliance with the appropriate EU Directives, compliance with the EHSR’s may be achieved by:
either
• the selection of hydraulic fluids that have fire-resistance, health and environmental properties appropriate
to the circumstances of use;
or
• the use of other safety measures in conjunction with, or instead of, certain fire-resistance, health and
environmental properties.
Selection of the optimum safe system can be achieved by adopting a risk assessment approach according to
the principles in EN 1050.
6.2 Need for detailed information
Because the water content and chemical composition of fire-resistant fluids may vary, not only from type to
type, but also from one product to another within a type, levels of fire resistance, health effects and
environmental properties may also vary. It follows that a fluid that is suitable for use in one circumstance and
provides compliance with the EHSR’s may not be suitable for other applications.
The initial step towards compliance with the EHSR’s is to carry out a logical examination of the circumstances
in which both the hydraulic fluid and the system are to be used so that the hazards that are present may be
determined (see Clause 7). Following this, an assessment is carried out to identify the consequences of the
hazards in terms of the possible effects of the occurrence of the hazardous event on people, property and the
environment (see Clause 8) so that the safety measures that need to be taken to control or to eliminate the
hazards or to reduce risks can be determined. These safety measures may include, but may not be confined
to, the use of fire-resistant fluids (see Clause 9).
It shall be remembered that other hazards that are not dealt with in this standard may exist and shall be the
subject of separate risk assessments. Annex A of EN 1050:1996 gives examples of hazards, hazardous
situations and events.
6.3 Information needed
The following basic information is needed for compliance assessment.
a) Circumstances of use for both the hydraulic fluid and the system so that the EHSR’s contained in the
Directives that are relevant to those circumstances may be ascertained.
b) Performance required of the hydraulic fluid in service by the end user or equipment manufacturer.
c) Determination of all hazards associated with the use, including foreseeable misuse (see Clause 7) and
foreseeable failure conditions.
d) Health and Safety Data Sheets for candidate hydraulic fluids.
e) Performance of candidate hydraulic fluids in appropriate tests to assess fire resistance, effects on health
and effects on the environment (see Clause 9).
f) Information on procedures for the disposal and waste treatment of candidate fluids.
It is also desirable to have available the following information.
g) Any experience with certified fire-resistant hydraulic fluids in the particular use or in similar circumstances.
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h) Any experience in the particular use with other hydraulic fluids of the same chemical type as that under
consideration.
i) Any experience with other hydraulic fluids in the particular use or in similar circumstances.
j) Any accident history and any information regarding damage to health or the environment.
Directive 67/548/EEC [3] (as amended by the Seventh Amendment 92/32/EEC [4]) and Directive
1999/45/EC [5] require suppliers of all substances to provide Health and Safety Data Sheets on their products
that give information relating to the health and safety of persons and the effect of the product on the
environment. Requirements for the general structure and content of Health and Safety Data Sheets are set
out in Directive 91/155/EEC [6] (as amended by Directive 93/112/EC [7]).
The Directive requires the data sheets to:
indicate the presence of components that have adverse health effects;
give appropriate risk and safety phrases;
identify the hazards that the product presents both to persons and to the environment;
provide information on first aid measures, fire-fighting, exposure controls and personal protection;
provide toxicological and ecological information.
NOTE 1 The data sheets may not contain all of the information needed to comply with the EHSR’s and to allow control
of all of the hazards that are identified in Clause 7 and that might be associated with hydraulic fluids.
NOTE 2 It is desirable at this stage to consider the use of hydraulic fluids that contain recycled components or readily
biodegradable fluids (see ISO 15380 [8]) in order to minimise the impact on the environment where technical requirements
permit.
7 Hazard identification
7.1 Fire hazards
The fire hazards potentially present in the situation under examination shall be determined.
The following fire hazards are directly related to the use of hydraulic fluids under fault conditions.
a) Ignition of combustible vapours produced by hydraulic fluid.
b) Ignition of hydraulic fluids ejected under pressure from hydraulic systems in the form of a spray.
c) Ignition of hydraulic fluid spilled during transport or leaking from hydraulic systems on to absorbent
material such as lagging or combustible dust and the subsequent propagation of fire along the absorbent
material.
d) Ignition of a fluid stream or pool.
e) Ignition of hydraulic fluids when the fire resistance has been reduced by chemical or physical changes in
the fluid caused by service operation.
EXAMPLE 1 Reduction of fire resistance due to evaporation or separation of the water content which provides fire
resistance for some types of fluid.
f) Ignition of fire-resistant fluid contaminated with more combustible substances.
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EXAMPLE 2 Contamination of fire-resistant fluid by mineral oil where system changeover procedures for the
conversion to the use of fire-resistant fluid have not been made correctly.
NOTE EN 1710 [9], which contains specifications for equipment intended for use in potentially explosive
atmospheres in mines, contains provisions for an allowed maximum temperature of machine surfaces, which are limited
not to exceed 150 °C.
7.2 Sources of ignition
The ignition sources potentially present in the situation under examination shall be determined.
Sources of ignition such as spark, flames, electric arcs, high surface temperatures, acoustic energy, optical
1)
radiation and electromagnetic waves are potentially present in underground mines They are also likely to be
present in other work situations. Possible situations in which these sources of ignition may occur are given
below. The list shall not be taken as being exhaustive:
discharge of static electricity;
stray electric currents or discharges from malfunctioning electricity supply equipment, which could
produce overheating of surfaces or sparks capable of causing ignition;
friction between moving surfaces or the entrapment of foreign bodies between moving surfaces caused,
for example, by failures of mechanical plant, causing localised overheating;
high surface temperatures in the workplace arising from the presence of molten materials or materials
undergoing high temperature manufacturing operations;
high surface temperatures present in the braking systems, transmissions, or exhausts of internal
combustion engines;
use of smoking or other materials that may be contraband in some industrial situations;
existing fires caused by the ignition of other combustible materials in the workplace.
Other ignition sources that may be present include open flames, welding spatter and sparks from grinding
operations. The importance of long periods of exposure to low grade sources of heat, which may, for example,
remove water from water-containing fluids, shall be considered.
7.3 Consequences of combustion
The risk assessment shall take account of the consequences of combustion in terms of obscuration of exits,
increased escape times, exposure to toxic products, local high temperatures and the possibility of the spread
of fire.
Combustion may result in:
• the production of smoke and/or steam, which may obscure exits and result in longer escape times;
• the production of toxic gases, the effects of which will depend on the nature of the products, the local
ventilation and escape conditions;
• high local temperatures, which may result in personnel being engulfed in flame or suffering immobilisation
due to burns; and
1) These sources of ignition have been identified in European Council Directive 92/104/EEC.[1]
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• the spread of fire.
7.4 Health hazards
The principal hazards to health, that shall be considered in relation to the use of hydraulic fluids, are the
following.
a) Acute oral toxicity.
b) Irritant effect on the skin.
c) Irritant effect on the eyes.
d) Inhalation toxicity of the fluid as an aerosol.
e) Inhalation toxicity of thermal decomposition products.
f) Allergic reactions or other results of repeated or long-term exposure.
g) Filter self-rescuers. These are provided to workers for protection against the presence
of carbon monoxide in the event of fire. In some countries, possible blocking of these self-rescuers is
considered as an additional hazard.
Some or all of these hazards may be present in industries other than mining. The health hazards potentially
present in the situation under examination shall be determined.
7.5 Environmental hazards
The possibility of escape of hydraulic fluid into the environment during storage, transport, use or disposal shall
be determined so that the environmental hazards potentially present may be considered and appropriate
system design modifications made, if necessary.
If hydraulic fluids escape into the environment or are not disposed of in a proper manner, they may potentially
have effects on:
• water-toxicity to aquatic organisms, including:
potential to bioaccumulate;
depletion of oxygen content;
persistence in the environment (biodegradability).
• soil-potential to contaminate groundwater and sources of drinking water, including:
potential to bio-accumulate,
persistence in the environment (biodegradability).
They are unlikely to have effects on air unless thermal decomposition occurs in the event of an accidental
exposure to a heat source, when the effect will be local to the combustion.
Hydraulic fluids can escape into the environment during transport, storage or use. It is important, therefore,
that the correct types of storage tanks and vessels for transportation are used and are correctly identified to
indicate the contents. Means of transporting fluids should be appropriate to minimise the likelihood of escape
into the environment. Measures such as collection trays to avoid spillage during filling should be considered.
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Separate and properly labelled tanks should be used for the collection of waste fluids intended for
reprocessing or disposal.
Local regulations may require particular aspects of environmental impact to be considered, including storage,
transport, use and disposal.
NOTE Readily biodegradable fire-resistant hydraulic fluids of the type HFA, HFC, HFDR and HFDU are available. The
HFDU products are similar to HEES products, which are in accordance with specification ISO 15380 [8].
8 Risk estimation
The possible risks associated with the hazards identified in Clause 7 shall be estimated for each situation of
use of hydraulic fluid so that the control measures needed for those hazards may be identified. EN 1050
contains detailed guidance on risk estimation, i.e. evaluating the consequences of hazards.
Consideration shall be given to the following.
a) The severity of harm that a hazard
...
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