oSIST prEN ISO 23495:2019

SLOVENSKI STANDARD
01-julij-2019
Industrijske peči in pripadajoča procesna oprema - Varnostne zahteve za peči za
proizvodnjo jekla in pripadajočo opremo (ISO/DIS 23495:2019)
Industrial furnaces and associated processing equipment - Safety requirements for steel
converter and associated equipment (ISO/DIS 23495:2019)
Sicherheit von Maschinen - Sicherheitsanforderungen an Stahlkonverter und zugehörige
Einrichtungen (ISO/DIS 23495:2019)
Fours industriels et équipements associés - Prescriptions de sécurité pour les
convertisseur et d'équipement associés (ISO/DIS 23495:2019)
Ta slovenski standard je istoveten z: prEN ISO 23495
ICS:
25.180.01 Industrijske peči na splošno Industrial furnaces in general
77.180 Oprema za metalurško Equipment for the
industrijo metallurgical industry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
ISO/DIS 23495
ISO/TC 244 Secretariat: JISC
Voting begins on: Voting terminates on:
2019-05-02 2019-07-25
Industrial furnaces and associated processing
equipment — Safety requirements for steel converter and
associated equipment
Fours industriels et équipements associés — Prescriptions de sécurité pour les convertisseur et
d'équipement associés
ICS: 13.100; 25.180.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 23495:2019(E)
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. ISO 2019

ISO/DIS 23495:2019(E)
© ISO 2019
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ii © ISO 2019 – All rights reserved

ISO/DIS 23495:2019(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms, definitions and abbreviated terms . 3
4 Significant hazards and risk assessment . 6
5 Safety requirements and/or measures . 7
5.1 General . 7
5.1.1 Introduction . 7
5.1.2 Plann ing phase . 7
5.1.3 Safety layout . . 7
5.1.4 Safety devices and protective measures . 8
5.1.5 Hydraulic, pneumatic, gas, cooling and lubrication systems . 9
5.1.6 Fluid systems carrying or containing fluids . 9
5.1.7 Fluids not to be discharged to drains . 9
5.1.8 Personal protective equipment .10
5.1.9 Warning devices and safety signs .10
5.1.10 Access .10
5.1.11 Escape routes .11
5.1.12 Electrical equipment .11
5.1.13 Safety related control system .11
5.1.14 Surface temperatures and heat radiation .12
5.1.15 Ergonomics .12
5.1.16 Fire protection .12
5.1.17 Operating stations for the steel converter .12
5.1.18 Portable wired/wireless control box .13
5.1.19 Loss of energy .13
5.1.20 Areas with special hazards . .13
5.1.21 Cooling water systems .14
5.1.22 Noise .14
5.1.23 Vibrations .15
5.1.24 Linked Equipment .15
5.1.25 Hold-to-run control device and enabling button .15
5.1.26 Mechanical restraint devices .15
5.1.27 Safety related software and parameters .16
5.2 List of significant hazards, hazardous situations, safety requirements and/or measures .16
5.2.1 Structure of Table 1 .16
6 Verification of the safety requirements and/or protective/risk reduction measures .28
6.1 General .28
6.2 Required verification D .28
6.3 Required verification V, M and T .29
7 Information for use .30
7.1 General .30
7.2 Warning devices and safety signs .30
7.3 Accompanying documents .30
7.3.1 Instruction handbook .30
7.3.2 Machine/equipment declaration .30
7.3.3 Instruction for transport, setting up/installation .31
7.3.4 Instruction about assembly, commissioning and dismantling .31
7.3.5 Operation instructions concerning the equipment.31
7.3.6 Maintenance instructions .34
7.4 Minimum marking .35
ISO/DIS 23495:2019(E)
7.5 Training of personnel .35
Annex A (normative) Safety requirements for electrical equipment andfor safety related
control systems .36
Annex B (normative) Steel converter and its associated equipment for theoxygen
steelmaking process .38
Annex C (normative) Noise test code .39
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2006/42/EC aimed to be coveredNOTE to the drafter,
Annex ZA to be removed before ISO publication .45
Bibliography .48
iv © ISO 2019 – All rights reserved

ISO/DIS 23495:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 244, Industrial furnaces and associated
processing equipment, WG 7, Safety requirements for steelmaking equipment
ISO/DIS 23495:2019(E)
Introduction
This document is a type C standard as stated in ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations and events are
covered are indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B
standards, the provisions of this type C standard take precedence over the provisions of the other
standards, for machines that have been designed and built according to the provisions of this type C
standard.
Where for clarity an example of a preventive measure is given in this document, this should not have
been considered as the only possible solution. Any other solution leading to the same risk reduction is
permissible if an equivalent level of safety is achieved.
This document assumes that
— the steel converter is operated and maintained by adequately trained personnel (see 3.13 and 7.5);
— manual intervention for setting, adjustment and maintenance is accepted as part of the intended
use of the steel converter;
— the steel converter is used with adequate workplace lighting conforming to e.g., ISO 8995-1.
This document assumes that the input materials do not contain the following hazardous components:
— radioactive scrap;
— explosives;
— entrapped water/ice;
— closed containers;
— oversized scrap which can lead to water leakage due to collision with lances (see 7.3.5).
The charging should be done to avoid/minimize risk of explosion.
This document is of relevance, in particular, for the following stakeholder groups representing the
market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance etc.)
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g., trade unions, organizations for people with special needs);
— service providers, e.g., for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
vi © ISO 2019 – All rights reserved

DRAFT INTERNATIONAL STANDARD ISO/DIS 23495:2019(E)
Industrial furnaces and associated processing
equipment — Safety requirements for steel converter and
associated equipment
1 Scope
This document applies for new steel converter and its associated equipment (hereinafter referred to as
converter plant) used in the process of carbon or stainless steel making as defined in 3.1 and illustrated
in Annex B.
This document deals with significant hazards, hazardous situations and events relevant to the converter
plant. It covers the intended use and foreseeable misuse.
This document specifies the safety requirements to be met during design, transport, setting up/
installation, assembly, commissioning, operation, maintenance (as described in Clause 5) and
decommissioning/disassembly of the equipment.
NOTE 1 Assembly does not include erection because national regulations, e.g., national civil engineering laws
and regulations or occupational health and safety regulations have to be considered.
This document applies to:
Steel converter and its associated equipment (see Annex B, Figure B.1) for the oxygen steelmaking process
— from charging hot metal/liquid steel and scrap;
— via oxygen refining and stirring;
— temperature measurement and sampling equipment;
— up to tapping including slag retaining device;
— cooling systems;
— maintenance devices (e.g., relining device, tap hole repair device, device for cleaning the
converter mouth);
— process related interfaces/interactions (e.g., according to design, controls) to
— process media,
— primary and secondary gas cleaning plant,
— material feeding systems and ladle alloying systems,
— transfer cars for steel ladle and slag pot, and
— charging/tapping equipment, e.g., crane, scrap chute, ladles and slag pots.
This document does not cover safety requirements for:
— usage of process media other than oxygen, nitrogen, argon and compressed air;
— primary and secondary gas cleaning plants;
— measuring devices with radioactive sources;
— material feeding systems and ladle alloying systems;
ISO/DIS 23495:2019(E)
— transfer cars for steel ladle and slag pot;
— charging/tapping and de-slagging equipment, e.g., crane, scrap chutes, ladles and slag pots;
— auxiliary winches and hoists.
NOTE 2 For variations of converter process where other gases and process media, e.g., hydrocarbons, fuels,
steam, etc. are used, additional safety measures have to be considered which are not covered in this safety
standard.
NOTE 3 In case of revamping, this document can be used as a guideline for the specific parts to be revamped.
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.
ISO 3864-1, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety
signs and safety markings
ISO 3864-2, Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product
safety labels
ISO 3864-3, Graphical symbols — Safety colours and safety signs — Part 3: Design principles for graphical
symbols for use in safety signs
ISO 4413, Hydraulic fluid power — General rules and safety requirements for systems and their components
ISO 4414, Pneumatic fluid power — General rules and safety requirements for systems and their components
ISO 4871:2009, Acoustics — Declaration and verification of noise emission values of machinery and
equipment
ISO 7000, Graphical symbols for use on equipment — Registered symbols
ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs
ISO 7731, Ergonomics — Danger signals for public and work areas — Auditory danger signals
ISO 11064-1, Ergonomic design of control centres — Part 1: Principles for the design of control centres
ISO 11202:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying approximate environmental
corrections
ISO 11428, Ergonomics — Visual danger signals — General requirements, design and testing
ISO 11429, Ergonomics — System of auditory and visual danger and information signals
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to
contact with surfaces — Part 1: Hot surfaces
ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 13849-2:2012, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13850:2015, Safety of machinery — Emergency stop function — Principles for design
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ISO/DIS 23495:2019(E)
ISO 13857, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO 14118, Safety of machinery — Prevention of unexpected start-up
ISO 14119, Safety of machinery — Interlocking devices associated with guards — Principles for design and
selection
ISO 14120, Safety of machinery — Guards — General requirements for the design and construction of fixed
and movable guards
ISO 14122-1, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed
means and general requirements of access
ISO 14122-2, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms
and walkways
ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs, stepladders
and guard-rails
ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders
ISO 16069, Graphical symbols — Safety signs — Safety way guidance systems (SWGS)
ISO 14123-1, Safety of machinery — Reduction of risks to health resulting from hazardous substances
emitted by machinery — Part 1: Principles and specifications for machinery manufacturers
ISO 14123-2, Safety of machinery — Reduction of risks to health resulting from hazardous substances
emitted by machinery — Part 2: Methodology leading to verification procedures
IEC 60204-1:2006, Edition 5.1:2009, Safety of machinery — Electrical equipment of machines — Part 1:
General requirements
IEC 61310-1, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual,
acoustic and tactile signals
IEC 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking
IEC 61511-1, Functional safety — Safety instrumented systems for the process industry sector — Part 1:
Framework, definitions, system, hardware and software requirements
IEC 62061:2005, Safety of machinery — Functional safety of safety-related electrical, electronic and
programmable electronic control systems (Note: To be replaced by IEC 44/788/CD (2017-02))
ISO 13854, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
IEC 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989 + A1: 1999 + A2: 2013)
3 Terms, definitions and abbreviated terms
For the purpose of this document, the terms and definitions given in ISO 12100, ISO 13574 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
NOTE Definition used in ISO standards referred to in this document are also valid for this document.
ISO/DIS 23495:2019(E)
3.1
steel converter
tiltable unit for the production of carbon or stainless steel
Note 1 to entry: This tiltable unit is mainly consisting of a vessel with refractory lining, trunnion ring, vessel
suspension system, tilting drive, etc.
3.2
associated equipment
additional equipment for the production of carbon steel or stainless steel by means of a steel converter
Note 1 to entry: For associated equipment, e.g., lances, see Figure B.1.
3.3
refining
conversion of hot metal to carbon steel or stainless steel by elimination of (mainly) carbon (and other
unwanted elements like silicon, phosphor) using oxygen supply
Note 1 to entry: Refining processes differ in oxygen supply from top, bottom or a combination of both; and
optional gas stirring
3.4
production process
all production-related activities between charging to tapping
3.5
maintenance devices
devices to maintain the converter
Note 1 to entry: Such devices are, e.g., relining device, tap hole repair device, clean-up device for converter mouth
3.6
manual mode
every single function/movement will be individually triggered by the operator
3.7
special control modes
dedicated modes activated by a specific device, to carry out operations
Note 1 to entry: e.g., like skull removal or slag splashing
3.8
maintenance
all activities carried out outside the production process
3.8.1
inspection
basic checks (e.g., visual) of equipment
3.8.2
service
periodic exchange of lances, cleaning (e.g., lance, converter mouth), lubrication, adjustment of limit
switches
3.8.3
repair
repair or exchange of damaged components accompanied with complete shutdown (i.e. isolation of
energy)
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ISO/DIS 23495:2019(E)
3.8.4
relining
all activities from shut down of converter for relining up to end of pre-heating (including converter
vessel exchange or parts of it, refractory breakout)
3.8.5
skull removal
special procedure for removing the skull inside the converter by using the blowing lance
3.9
ladle
vessel with refractory lining to collect, treat, transport and charge/discharge hot metal/steel
3.10
slag pot
vessel to collect, treat and transport slag
3.11
scrap chute
scrap charging container used to charge scrap into the converter
3.12
work stations
predefined locations for personnel used for production or maintenance
3.12.1
converter control room
main control room in which the control desk and monitoring facilities for a steel converter are located
Note 1 to entry: It is a location where operating personnel is required permanently during the production
process.
3.12.2
local control stands
control units usually situated adjacent to the equipment
Note 1 to entry: It is a location where operating personnel is required temporarily during the production process,
e.g., during charging or tapping.
3.12.3
portable control box
mobile control units connected to the control system, wired or wireless
Note 1 to entry: For example, to position equipment more precisely.
3.13
trained personnel
person with the knowledge of systems, background, experience and ability to operate and/or maintain
the equipment in the intended use and proper operation of the machinery/equipment
3.14
authorized personnel
trained person who is instructed by the user to perform a specific task on a specific equipment
3.15
doghouse
enclosure around the converter vessel consisting of sidewalls, ceiling and movable doors (see 5.1.4.4)
Note 1 to entry: The primary purpose is to contain noise and dust during process and should protect the converter
platform against steel or slag splashing.
ISO/DIS 23495:2019(E)
3.16
skirt
movable water-cooled part of the gas cleaning system
Note 1 to entry: Located above the converter mouth
3.17
protection platform
(re-)movable platform above the converter
Note 1 to entry: Protecting lower areas from falling material.
3.18
danger zone
any space within and/or around machinery in which a person can be exposed to a hazard
3.19
safety layout
graphical description of plant-related equipment with regard to safety
3.20
warning system
visible, audible warning devices or a combination of both
3.21
blowing lance
water cooled vertical lance used for blowing technical gases, mainly oxygen
3.22
sub-lance
water cooled vertical lance used for temperature measurement and sampling during production process
3.23
relining machinery/device
machine for manual or automatic installation of refractory lining inside the converter
Note 1 to entry: Associated lifting, lowering and travelling devices for material transport and access to the
workplace are included.
3.24
fire-resistant hydraulic fluid
hydraulic fluid that is difficult to ignite and shows little tendency to propagate flame[SOURCE:
ISO 5598:2008; 3.2.271]
Abbreviated terms
AOD argon oxygen decarburization
BOF basic oxygen furnace
PPE personal protective equipment
CCTV closed circuit television
PLC programmable logic control
4 Significant hazards and risk assessment
All the significant hazards, hazardous situations and events, as far as they are dealt with in this
document, identified by risk assessment as significant for this type of machinery and which require
action to eliminate or reduce the risk are listed in columns 1 and 2 of 5.2, Table 1.
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ISO/DIS 23495:2019(E)
In addition, the manufacturer shall carry out a plant-related risk assessment, including interfaces to
auxiliary equipment, according to ISO 12100:2010; Clause 4 to identify any other significant hazard
of the machine/equipment. Significant hazards identified in this plant-related risk assessment but not
dealt with in this standard shall be reduced by applying the principles of ISO 12100.
5 Safety requirements and/or measures
5.1 General
5.1.1 Introduction
Converter plants conforming to this document shall comply with the safety requirements and/or
measures set out in Clause 5 together with those set out in Annex A and C for a typical installation as
illustrated in Annex B, and the information for use as defined in Clause 7.
Special consideration shall be given to CO emission due to process transients and/or equipment failure.
In general, risks and associated hazards are production and plant-related. The variety of different
plants (i.e. different combinations of equipment, different boundary conditions) could not be covered in
all details in such a document. To deal with this fact, an individual risk assessment of the steel converter
in question shall be carried out (see Clause 4) considering the safety requirements of this document.
The manufacturer shall include in the information for use all details required for a safe operating
process under normal operating conditions. He shall also describe the specific safety measures in case
of special conditions, e.g., maintenance and adjustment work.
If in addition to the technical measures further measures for risk reduction by organizational precautions
according to ISO 12100:2010; Clause 5 are necessary, the manufacturer shall include in the Information
for use details of this measures and the necessary information considering the residual risks.
5.1.2 Planning phase
The manufacturer shall undertake during planning phase together with the user a layout-check to
ensure good placement and safe operation of the converter plant, in particular with regard to:
— position of physical emergency systems;
— accessibility;
— maintenance and cleaning;
— movement of parts of the equipment and material;
— prevention of emissions hazardous to health at the work stations (e.g., avoiding harmful emissions);
— considering ergonomic requirements;
— escape routes.
5.1.3 Safety layout
A safety layout shall be prepared. The aim of the safety layout is to give information (normally by means
of one or more drawings) about the physical position of safety related elements at the converter plant.
It is recommended to involve the user of the equipment, e.g., regarding escape routes, fire extinguishing
systems, etc.
If applicable, the following shall at least be illustrated:
— areas where the risk of injury due to contact with liquid metal or slag including spraying is given;
ISO/DIS 23495:2019(E)
— emergency stop buttons;
— escape and access routes (if necessary, e.g., for large plants);
— areas influenced by low oxygen and/or harmful gases (e.g., CO or asphyxiating gases);
— visible/audible warning devices;
— safety related marking;
— safety signs;
— fixed guards (e.g., fences);
— moveable guards (e.g., safety doors);
— light barriers or safety scanners.
The safety layout shall be part of the Instruction for use.
5.1.4 Safety devices and protective measures
5.1.4.1 Safety devices
Safety devices and devices with safety function (e.g., limit switches, locking devices) shall be accessible
for maintenance. These devices shall be protected against damage and the possibility of defeating or
circumventing in a foreseeable manner (for further details, see ISO 14119 and ISO 13849-2:2012; Annex
D.1 and D.2).
All relevant energy isolating devices, either main or local, shall include facilities to apply one or more
padlocks (see ISO 14118).
5.1.4.2 Guards
Guards used to prevent access to danger zones shall be selected as appropriate for the degree and
frequency of access to be permitted, e.g., an enclosing guard or distance guard, fixed or movable
with interlock. This selection shall be made according to ISO 14120. Interlock systems shall meet the
requirements of ISO 14119 and ISO 13849-1 (see 5.1.13). The requirements of the guards shall conform
to ISO 14120, ISO 13857 and ISO 13854.
As an exception to the requirements of ISO 14120, there is no necessity for attaching (e.g., by screws)
guards or guarding (e.g., covers) which could be removed only by auxiliary devices (e.g., cranes) due to
the heavy weight.
With regard to the safety distances described in ISO 13857, the minimum height of distance guards
(e.g., perimeter fences, protective structures) shall be 1 400 mm.
5.1.4.3 Guard-rails
Guard-rails are to be considered as means to deter or impede access to hazardous areas, i.e. a physical
obstacle which only reduces the probability of access (but does not totally prevent it), offering an
obstruction to free access (see ISO 12100:2010; 3.29).
Therefore, guard-rails are not permitted as the sole measure of safeguarding hazardous areas in case of
significant risks (e.g., from moving machinery or processed product). Guard-rails may only be used for
cases where the hazards of slips, trips and falls are involved.
Guard-rails can be used as a measure to prevent unintentional access of unauthorised personnel to
zones where residual risks exist after more effective risk reduction measures have been used (e.g.,
zones where equipment with potentially dangerous movements can be operated only in manual mode
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ISO/DIS 23495:2019(E)
by means of hold-to-run devices from operating stations with full overview of the driven elements, see
5.1.17 of this standard).
Guard-rails shall conform to ISO 14122-3.
5.1.4.4 Doghouse
A doghouse shall be provided to reduce the environmental impact of the process in general (e.g.,
containing or guiding dust to the dust collection system). As a secondary effect, it also reduces the noise
level and contains splashes.
It has to be noted that doghouse doors are not guards according to ISO 14119 and are not interlocked
with the process. In the circumstances where the doghouse doors are not closed (e.g., due to process
observation), further production can be continued temporarily if specific instructions and/or additional
safety measures like temporary guards have been provided.
Where a doghouse cannot be installed, e.g., for "micro" AOD converters used in foundries (typical
capacity less than 25 t), measures like sidewalls, protection shields and removable platforms with
protection devices shall be provided.
5.1.4.5 Emergency pit
An emergency pit with the minimum capacity of the entire charge (liquid steel, slag and additions) of
the converter shall be provided. It shall be ensured that this pit is kept clean, dry and free of snow/ice.
5.1.4.6 Hot metal ladle, steel ladle and slag pot
It shall be ensured that the ladle and slag pot has to be dry and free of snow/ice prior to filling with
liquid metal/liquid slag to prevent dangerous steam build-up.
5.1.5 Hydraulic, pneumatic, gas, cooling and lubrication systems
Hydraulic, pneumatic, gas, cooling and lubrication systems shall be designed to reduce risks from toxic
effects, fire, explosion and noise (e.g., covering and routing of pipes). It does not automatically lead to
the usage of fire-resistant hydraulic fluids in general.
The systems shall meet the safety requirements as defined in ISO 4413 or ISO 4414 and considering the
requirements specified in Table 1.
5.1.6 Fluid systems carrying or containing fluids
Fluid systems exposed to process hazards, e.g., high temperatures or impacts shall be adequately
protected if the damaged fluid systems could cause personal injuries.
Where the risk of fire is given emergency shut-off devices shall be provided. Emergency shut-off devices
for the fluid system shall be:
— installed in a safe area outside the danger zone,
— easily accessible, and
— the location shall be clearly indicated.
5.1.7 Fluids not to be discharged to drains
Fluids that have to be discharged into dedicated sumps/containers shall be specified. Instruction for
discharge shall be included in the information for use.
ISO/DIS 23495:2019(E)
5.1.8 Personal protective equipment
The manufacturer shall give information in the information for use (see Clause 7) on the required type
of personal protective equipment (PPE).
5.1.9 Warning devices and safety signs
5.1.9.1 Visual and audible danger signals
Audible warning signals shall be in accordance with ISO 7731.
General requirements, design and testing of visual danger signals shall be in accordance with ISO 11428.
System of auditory and visual danger and information signals shall be in accordance with ISO 11429.
Requirements for indication, marking and actuation shall be in accordance with IEC 61310 (all parts).
The information for use shall contain instructions for maintenance of warning devices according to 7.3.6.
5.1.9.2 Safety signs
Safety signs shall be in accordance with ISO 7010.
Design principles for safety signs shall be in accordance with ISO 3864-1.
Design principles for product safety labels shall be in accordance with ISO 3864-2.
Design principles for graphical symbols for use in safety signs shall be in accordance with ISO 3864-3.
Safety way guidance systems shall be in accordance with ISO 16069.
5.1.10 Access
5.1.10.1 Access to a danger zone shall be restricted and therefore shall be protected by guards according
to 5.1.4.2 (e.g., lance change area).
Exceptions:
a) Guards preventing/hindering traffic cannot be installed on converter platform, because authorized
personnel need access free from obstacles to perform different operations very frequently with
machines.
b) Guards should not be installed on ground floor in the converter area (see Figure C.1), because
authorized personnel need access to perform different operations very frequently with machines.
In addition, guards could hinder the escape of personnel in case of an emergency.
5.1.10.2 In order to allow authorized personnel safe access to and stay in areas protected by movable
interlocked guards, adequate technical safety measures shall be applied as follows:
a) Access conditions: All sources of energy causing a danger inside a danger zone shall be in a safe
condition (e.g., movements and process media flows are stopped);
b) Conditions for staying/working: Hazardous movements inside a danger zone shall only be
permitted with a hold-to-run control device and by using an enabling button and if necessary, at
reduced speed;
c) Conditions for restart: See 7.3.5.1 h).
5.1.10.3 Access to control desks, converter control rooms, underground areas, inspection and service
floors shall be in accordance with ISO 13857, ISO 14122-1 to ISO 14122-4.
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ISO/DIS 23495:2019(E)
5.1.10.4 Guard-rails shall be in accordance with 5.1.4.3.
5.1.10.5 Surfaces of walkways and stairs shall have slip-resistant surfaces according ISO 14122-3.
5.1.10.6 The required performance level (PLr) in relation to the category of safety related parts of the
control systems for access to equipment during operation or maintenance shall be selected according to
Annex A; A.2 and/or 5.2 (Table 1) and shall consider the requirements of ISO 14118 and ISO 14119.
5.1.10.7 Accessible rotating/moving parts like drive shafts, couplings, belts and chains, pulleys and
sprockets, i.e., where the safety distances in ISO 13857 cannot be met, shall be guarded in accordance with
ISO 14120. Rotating shafts should be marked so that it is visually evident when the shafts are in motion.
5.1.10.8 Safety signs shall be in accordance with 5.1.9.2.
5.1.11 Escape routes
The design of escape routes is not harmonized. Therefore, the national regulations should be followed.
Escape routes should meet the following minimum requirements:
— two exits which shall be located as distant as possible from each other or in conformity with the
local requ
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