SIST EN 16750:2017
(Main)Fixed firefighting systems - Oxygen reduction systems - Design, installation, planning and maintenance
Fixed firefighting systems - Oxygen reduction systems - Design, installation, planning and maintenance
This European Standard covers oxygen reduction systems that are used as fire prevention systems by creating an atmosphere in an area which is having a lower permanent oxygen concentration as in ambient conditions. The level of oxygen reduction is defined by the individual risks of these areas (see Annex A). Oxygen reduction is achieved by technical systems which are providing a flux of air containing a reduced concentration of oxygen.
This European Standard specifies minimum requirements and defines the specifications governing the design, installation and maintenance of fixed oxygen reduction systems with oxygen reduced air in buildings and industrial production plants. The standard also applies to the extension and modification of existing systems.
This European standard applies to oxygen reduction systems using nitrogen which are designed for continual oxygen reduction in enclosed spaces.
NOTE Nitrogen is today the most suitable gas to be used for oxygen reduction. For other gases this European standard can be used as basis.
This European Standard does not apply to oxygen reduction systems that use water mist or combustion gases.
The European Standard does not apply to:
- explosion suppression systems,
- explosion prevention systems,
- fire extinguishing systems using gaseous extinguishing agents,
- inertization of portable containers,
- systems in which oxygen levels are reduced for reasons other than fire prevention (e.g. steel processing in the presence of inert gas to avoid the formation of oxide film),
- inerting required during repair work on systems or equipment (e.g. welding) in order to eliminate the risk of fire or explosion.
In addition to the conditions for the actual oxygen reduction system and its individual components this European Standard also covers certain structural specifications for the protected area.
Ortsfeste Löschanlagen - Sauerstoffreduktionsanlagen - Konstruktion, Einbau, Planung und Instandhaltung
Diese Europäische Norm behandelt Sauerstoffreduktionsanlagen, die als Brandvermeidungsanlagen verwendet werden, indem in einem Bereich eine Atmosphäre erzeugt wird, die eine niedrigere ständige Sauerstoffkonzentration aufweist als unter Umgebungsbedingungen. Der Grad der Sauerstoffreduzierung ist durch die einzelnen Brandrisiken, die in diesen Bereichen vorherrschen, festgelegt (siehe Anhang A). Die Sauerstoffreduzierung wird durch technische Systeme erreicht, die einen Luftstrom ermöglichen, dessen Sauerstoffkonzentration reduziert ist.
Diese Europäische Norm legt die Mindestanforderungen an die Konstruktion, den Einbau und die Instandhaltung von ortsfesten Sauerstoffreduktionsanlagen mit sauerstoffreduzierter Luft in Gebäuden und Industrieanlagen fest und enthält die diesbezüglichen Festlegungen. Die Norm gilt auch für die Erweiterung und Änderung bereits vorhandener Anlagen.
Diese Europäische Norm gilt für Sauerstoffreduktionsanlagen unter Verwendung von Stickstoff, die für eine kontinuierliche Sauerstoffreduzierung in geschlossenen Räumen ausgelegt sind.
ANMERKUNG Stickstoff ist gegenwärtig das geeignetste Gas für die Sauerstoffreduzierung. Bezüglich weiterer Gase kann diese Europäische Norm als Grundlage dienen.
Diese Europäische Norm gilt nicht für Sauerstoffreduktionsanlagen, die Wassernebel oder Verbrennungsgase verwenden.
Diese Europäische Norm gilt nicht für:
- Explosionsunterdrückungsanlagen;
- Explosionsschutzanlagen;
- Feuerlöschanlagen mit gasförmigen Feuerlöschmitteln;
- die Inertisierung tragbarer Behälter;
- Anlagen, bei denen der Sauerstoffgehalt aus anderen Gründen als der Brandvermeidung reduziert wird (z. B. Stahlverarbeitung in Gegenwart eines Inertgases zur Vermeidung der Bildung einer Oxidschicht);
- die Inertisierung, die bei Reparaturarbeiten von Anlagen oder Ausrüstungen (z. B. Schweißen) zur Beseitigung einer Brand- oder Explosionsgefahr erforderlich ist.
Neben den Bedingungen für die eigentliche Sauerstoffreduktionsanlage und ihre einzelnen Bauteile behandelt die vorliegende Europäische Norm auch bestimmte konstruktive Festlegungen für den Schutzbereich.
Installations fixes de lutte contre l’incendie - Systèmes d’appauvrissement en oxygène - Conception, installation, planification et maintenance
La présente Norme européenne traite des systèmes d’appauvrissement en oxygène qui sont utilisés comme systèmes de prévention incendie en créant une atmosphère dans une zone dans laquelle la concentration en oxygène est réduite en permanence dans les conditions ambiantes. Le niveau d’appauvrissement en oxygène est défini par les risques individuels concernant ces zones (voir l’Annexe A). L’appauvrissement en oxygène est obtenu au moyen de systèmes techniques qui fournissent un flux d’air ayant une concentration réduite en oxygène.
La présente Norme européenne spécifie les exigences minimales et définit les spécifications régissant la conception, l’installation et la maintenance des systèmes fixes d’appauvrissement en oxygène dans des bâtiments et dans des usines de production industrielle fonctionnant sous air appauvri en oxygène. La norme s’applique également à l’extension et à la modification des systèmes existants.
La présente Norme européenne s’applique aux systèmes d’appauvrissement en oxygène utilisant de l’azote, qui sont conçus pour assurer un appauvrissement continu en oxygène dans des espaces clos.
NOTE L’azote est à l’heure actuelle le gaz le mieux adapté pour réaliser un appauvrissement en oxygène. Pour les autres gaz, la présente Norme européenne peut être utilisée comme base.
La présente Norme européenne ne s’applique pas aux systèmes d’appauvrissement en oxygène comme le brouillard d’eau ou les systèmes d’extinction gaz.
La présente Norme européenne ne s’applique pas :
- aux systèmes anti-explosion ;
- aux systèmes de prévention des explosions ;
- aux systèmes d’extinction d’incendie utilisant des agents extincteurs gazeux ;
- à l’inertage des réservoirs portatifs ;
- aux systèmes dans lesquels les niveaux d’oxygène sont réduits pour des raisons autres que la prévention incendie (par exemple transformation de l’acier en présence de gaz inerte pour éviter la formation d’un film d’oxyde) ;
- à l’inertage nécessaire pendant les travaux de réparation des systèmes ou de l’équipement (par exemple soudage) afin d’éliminer le risque d’incendie ou d’explosion.
En plus des conditions qui s’appliquent au système d’appauvrissement en oxygène proprement dit et à ses composants individuels, la présente Norme européenne couvre également certaines spécifications structurelles relatives à la zone protégée.
Vgrajeni gasilni sistemi - Sistemi z zmanjšano koncentracijo kisika - Projektiranje, vgradnja, načrtovanje in vzdrževanje
Ta evropski standard zajema sisteme z zmanjšano koncentracijo kisika, ki se uporabljajo kot sistemi za preprečevanje požara, tako da ustvarijo ozračje na območju z nižjo stalno koncentracijo kisika kot v okoljskih pogojih. Stopnjo zmanjšanja količine prisotnega kisika določajo posamezna tveganja teh območij (glej dodatek A). Zmanjšanje količine prisotnega kisika dosežejo tehnični sistemi, ki zagotavljajo pretok zraka z zmanjšano koncentracijo kisika.
Ta evropski standard določa minimalne zahteve in specifikacije, ki urejajo projektiranje, vgradnjo ter vzdrževanje fiksnih sistemov z zmanjšano koncentracijo kisika z zagotavljanjem pretoka zraka z zmanjšano koncentracijo kisika v stavbah in industrijskih proizvodnih obratih. Standard se uporablja tudi za razširitev in spremembo obstoječih sistemov.
Ta evropski standard se uporablja za sisteme z zmanjšano koncentracijo kisika z uporabo dušika, ki so namenjeni za neprekinjeno zmanjševanje količine prisotnega kisika v zaprtih prostorih.
OPOMBA: V današnjem času je najprimernejši plin, ki se uporablja za zmanjšanje količine prisotnega kisika, dušik. Za druge pline se lahko ta evropski standard uporablja kot podlaga.
Ta evropski standard se ne uporablja za sisteme z zmanjšano koncentracijo kisika, ki uporabljajo vodno meglo ali zgorevalne pline.
Ta evropski standard se ne uporablja za:
– sisteme za zadušitev eksplozije;
– sisteme za preprečevanje eksplozije;
– sisteme za gašenje požara s plinskimi gasilnimi sredstvi;
– inertizacijo prenosnih vsebnikov;
– sisteme, pri katerih se ravni kisika zmanjšujejo zaradi razlogov, ki ne vključujejo protipožarne zaščite (npr. pri predelavi jekla v prisotnosti inertnega plina, da se prepreči tvorba oksidnega filma);
– inertiranje, potrebno pri popravilih sistemov ali opreme (npr. za varjenje), da se odpravi nevarnost požara ali eksplozije.
Poleg pogojev za dejanski sistem z zmanjšano koncentracijo kisika in njegove posamezne sestavne dele ta evropski standard zajema tudi nekatere konstrukcijske specifikacije za zavarovano območje.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 16750:2017
01-november-2017
9JUDMHQLJDVLOQLVLVWHPL6LVWHPL]]PDQMãDQRNRQFHQWUDFLMRNLVLND3URMHNWLUDQMH
YJUDGQMDQDþUWRYDQMHLQY]GUåHYDQMH
Fixed firefighting systems - Oxygen reduction systems - Design, installation, planning
and maintenance
Ortsfeste Löschanlagen - Sauerstoffreduktionsanlagen - Konstruktion, Einbau, Planung
und Instandhaltung
Installations fixes de lutte contre l’incendie - Systèmes d’appauvrissement en oxygène -
Conception, installation, planification et maintenance
Ta slovenski standard je istoveten z: EN 16750:2017
ICS:
13.220.10 Gašenje požara Fire-fighting
SIST EN 16750:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 16750:2017
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SIST EN 16750:2017
EN 16750
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 13.220.20
English Version
Fixed firefighting systems - Oxygen reduction systems -
Design, installation, planning and maintenance
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Löschanlagen - Sauerstoffreduktionsanlagen -
d'appauvrissement en oxygène - Conception, Konstruktion, Einbau, Planung und Instandhaltung
installation, planification et maintenance
This European Standard was approved by CEN on 9 July 2017.
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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16750:2017 E
worldwide for CEN national Members.
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SIST EN 16750:2017
EN 16750:2017 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 System requirements . 9
4.1 General . 9
4.2 Personnel safety . 9
4.3 Effectiveness and application . 9
4.4 Alarm organization and emergency plan . 10
5 Design . 10
5.1 Qualification of the designer . 10
5.2 Fire protection concept . 10
5.3 Structural specifications for the protected area . 10
5.4 Oxygen concentration . 11
5.5 Oxygen reduction to prevent fire . 11
5.6 Safety margins . 12
5.7 Oxygen reduced air quantity . 16
5.7.1 Continuous oxygen reduction . 16
5.7.2 Emergency plan . 16
5.7.3 Oxygen reduced air . 16
5.7.4 Gaseous supply . 17
5.7.5 Fault signals . 17
5.8 Technical areas . 17
5.8.1 Technical area for control panel . 17
5.8.2 Technical area for reduced oxygen air generation . 18
6 Distribution pipework . 18
6.1 Pipework . 18
6.2 Pipe supports . 19
6.3 Components in the pipework . 19
7 Monitoring the oxygen concentration . 19
8 Alarms and notifications . 21
9 Control equipment . 21
9.1 Function . 21
9.2 Requirements . 22
9.3 Electrical power supply . 22
9.4 Electrical installations . 22
9.5 Data recording . 22
10 System operation . 23
10.1 Instruction and training of personnel . 23
10.2 Inspections . 23
10.3 Operations log . 23
10.4 Further obligations . 23
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EN 16750:2017 (E)
11 Maintenance . 23
12 Documentation . 24
13 Installation . 25
13.1 Qualification of the installer . 25
13.2 General specifications, installation . 25
Annex A (normative) Ignition thresholds for oxygen reduction using nitrogen in fire
prevention . 26
A.1 Ignition thresholds . 26
A.2 Tests to ascertain ignition thresholds of unfamiliar materials . 27
A.2.1 Cup burner tests . 27
A.2.2 Ignition threshold tests . 28
A.2.2.1 General . 28
A.2.2.2 Test criteria . 29
A.2.2.3 Test documentation . 29
Annex B (informative) Information for health and safety – Working in oxygen-reduction
atmospheres for reasons of fire prevention . 31
B.1 General . 31
B.2 Principles of occupational health . 31
B.3 Risk classes . 31
B.4 Basic requirements, planning and installation . 32
B.5 Protective measures for all areas with oxygen-reduced atmospheres . 33
B.5.1 Structural and technical measures. 33
B.5.2 Organizational measures . 34
B.6 Risk classes and safety measures . 34
Annex C (informative) Existing national regulations for access and working in areas with
lower oxygen concentration . 36
Bibliography . 37
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SIST EN 16750:2017
EN 16750:2017 (E)
European foreword
This document (EN 16750:2017) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2018, and conflicting national standards shall
be withdrawn at the latest by March 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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SIST EN 16750:2017
EN 16750:2017 (E)
Introduction
Oxygen reduction systems are designed to prevent fires from starting or spreading, by means of the
introduction of oxygen reduced air. Oxygen reduction systems are not designed to extinguish fires. The
design and installation shall be based on detailed knowledge of the protected area, its occupancy and
the materials in question. It is important to suit the fire protection measures to the hazard as a whole.
It is important to emphasize that across the European Union there are several regulatory and legislative
limitations for access and working in areas with lower oxygen concentration, so it is important to take
these limitations into account. Use of this European Standard can vary based on the national legislation
in each country of the European Union.
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SIST EN 16750:2017
EN 16750:2017 (E)
1 Scope
This European standard specifies oxygen reduction systems that are used as fire prevention systems by
creating an atmosphere in an area which is having a lower permanent oxygen concentration as in
ambient conditions. The level of oxygen reduction is defined by the individual risks of these areas (see
Annex A). Oxygen reduction is achieved by technical systems which are providing a flux of air
containing a reduced concentration of oxygen.
This European standard specifies minimum requirements and defines the specifications governing the
design, installation and maintenance of fixed oxygen reduction systems with oxygen reduced air in
buildings and industrial production plants. The standard also applies to the extension and modification
of existing systems.
This European standard applies to oxygen reduction systems using nitrogen which are designed for
continual oxygen reduction in enclosed spaces.
NOTE Nitrogen is today the most suitable gas to be used for oxygen reduction. For other gases this European
standard can be used as basis.
This European standard does not apply to oxygen reduction systems that use water mist or combustion
gases.
The European standard does not apply to:
— explosion suppression systems;
— explosion prevention systems;
— fire extinguishing systems using gaseous extinguishing agents;
— inertization of portable containers;
— systems in which oxygen levels are reduced for reasons other than fire prevention (e.g. steel
processing in the presence of inert gas to avoid the formation of oxide film);
— inerting required during repair work on systems or equipment (e.g. welding) in order to eliminate
the risk of fire or explosion.
In addition to the conditions for the actual oxygen reduction system and its individual components this
European standard also covers certain structural specifications for the protected area.
The space protected by an oxygen reduction system is a controlled and continuously monitored indoor
climate for extended occupation. This standard does not cover unventilated confined spaces that may
contain hazardous gases.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 54 (all parts), Fire detection and fire alarm systems
EN 12094-1, Fixed firefighting systems - Components for gas extinguishing systems - Part 1: Requirements
and test methods for electrical automatic control and delay devices
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SIST EN 16750:2017
EN 16750:2017 (E)
EN 50104, Electrical apparatus for the detection and measurement of oxygen - Performance requirements
and test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Alarms
3.1.1
external alarm
alarm to emergency services such as fire brigade or permanently attended location
3.1.2
local alarm
acoustic and possibly additional visual alarm in protected areas or their immediate surroundings
3.1.3
internal alarm
acoustic and visual displays at the detection panel, possibly with additional displays at other signalling
equipment
3.1.4
alarm threshold
value of a process parameter which, when reached, triggers an alarm and, where necessary, initiates
automatic protection measures
3.1.5
alarm signal
signal to warn people at risk and/or to summon help from the emergency services and/or to provide
information about automatic response measures
3.2
design concentration
ingnition threshold including a safety margin
Note 1 to entry: See also Figure 1.
Note 2 to entry: The design concentration represents the maximum oxygen concentration which cannot be
exceeded in any time.
3.3
emergency situation
deviation from normal operation
EXAMPLE For example a significant deviation from the threshold value (scale of risk).
3.4
operating pressure
pressure of a system under normal operating conditions
3.5
combustible material
A material capable of combustion or being ignited
Note 1 to entry: For the purposes of this standard, whether the quantity of a combustible material is to be
regarded as significant or not can be determined by means of a risk analysis as part of the fire protection design.
7
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SIST EN 16750:2017
EN 16750:2017 (E)
3.6
ignition threshold
maximum oxygen concentration in a mixture of a combustible material with air and inert gas, in which
there can be no ignition, determined under established test conditions
Note 1 to entry: This is a specific characteristic of combustible material and inert gas (see A.1).
3.7
detection and alarm installation
remote detection system for the reliable detection of risk to people and property
Note 1 to entry: It creates alarm reports from automatic or manually input information, issues these and detects
any faults. The transmission channels for information and alarms are monitored. Special measures are in place to
prevent any malfunction as far as possible, which may be powered electrically or otherwise. Detection and alarm
systems cover facilities for the input, transmission (through wires or wirelessly), processing and issuing of alarms,
including the necessary power supply. This standard applies to detection and alarm systems which detect and
report the scale of the risk at an early stage.
3.8
measuring zones
virtual separation of the protected volume for oxygen measuring
3.9
normal operation
situation in which the equipment, protection systems and components are able to carry out their
designated functions within their design parameters
3.10
oxygen reduced air
ambient air with an oxygen concentration lower than natural air
3.11
oxygen reduced air supply
nitrogen enriched air stream with an oxygen concentration of less than natural air ready to be
introduced into a protected volume
3.12
oxygen reduction
reduction of oxygen which increases the nitrogen concentration to prevent the ignition or spread of fire
3.13
protected volume
effective volume of the space to be protected
3.14
system
combination of components whose function and compatibility guarantees the safety of the installation
3.15
technical areas
areas where either or the control panel, nitrogen production unit and other relevant system
components are placed
8
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SIST EN 16750:2017
EN 16750:2017 (E)
3.16
control panel
electrical device for monitoring, controlling and alarm of the oxygen reduction system
4 System requirements
4.1 General
An oxygen reduction system shall consist basically of:
a) a supply of oxygen reduced air;
b) a fixed pipework system with fittings, valves, nozzles, outlets;
c) oxygen sensors and control panel;
d) alarms.
Oxygen reduced air is produced by air separation or by injecting inert gas or gas mixture into the
protected area.
The oxygen concentration in the protected area shall be monitored by means of measuring equipment.
During operation, the supply of nitrogen shall be controlled automatically according to demand. Where
necessary as a result of a risk analysis additional means shall be provided to operate the supply
manually or an additional supply operated manually or automatically.
The oxygen reduction system can be equipped with automatic equipment designed to shut down
machinery and to close fire doors and other equipment, with the aim of creating and maintaining the
required oxygen concentration.
4.2 Personnel safety
Oxygen reduced air can be dangerous for personnel.
Adherence to this European Standard does not remove the user's statutory responsibility to comply
with the relevant national bodies and laws. In case no national laws exist, further information can be
found in Annex B.
Code requirements for unventilated confined spaces do not apply to space protected by oxygen
reduction system that control and continuously monitor indoor climate for extended occupation.
Personnel safety measures shall be made for the fact that neighbouring volumes can have a reduced
oxygen concentration. These areas may also need to be monitored and/or personnel safety measures
may need to be taken.
Technical or organizational measures shall be taken to prevent unauthorized people from entering
protected areas with permanently reduced oxygen levels.
The measurement system shall be designed in such a way that a loss of function or a measurement
error can in no event lead to the minimum oxygen threshold not being detected.
The spreading of the oxygen-reduced atmosphere to other areas not intended for this (e.g. through wall
openings, cable ducts, floor drainages, leaking doors, conveyor belts, etc.) shall be prevented.
4.3 Effectiveness and application
A fire risk assessment detailing the key fire protection factors shall be done. The important aspects are:
— the type and quantity of material/materials requiring protection;
— the area(s) requiring protection;
— the right dimension of the oxygen reduced air supply to maintain the reduced oxygen concentration
on its design value;
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SIST EN 16750:2017
EN 16750:2017 (E)
— a back-up oxygen reduced air supply, if provided;
— alarm equipment.
Oxygen reduction systems provide preventive fire protection. The introduction of nitrogen reduces the
oxygen concentration of the air, thereby preventing the ignition or spread of fire except for the
following:
— chemicals containing their own supply of oxygen, such as cellulose nitrate;
— mixtures containing oxidizing materials, such as sodium chlorate or sodium nitrate;
— chemicals cable of undergoing auto-thermal decomposition, such as some organic peroxides;
— reactive metals (such as sodium, potassium, magnesium, titanium and zirconium), reactive
hydrides or metal amides, some of which may react violently.
4.4 Alarm organization and emergency plan
An alarm organization is required for the following purposes:
— to alert affected and responsible persons;
— to alert the permanently attended location;
— to initiate other necessary protective measures.
The responsibilities for the alarm organization shall be defined.
The emergency plan should cover keywords to designate the basic measures that need to be taken in
case of emergency, too low oxygen level or fire signal.
5 Design
5.1 Qualification of the designer
The designer shall be sufficiently technically qualified to ensure effective protection.
5.2 Fire protection concept
The system design shall be part of the fire safety concept of the building.
As part of the system design a fire risk assessment might lead to further fire protection measures.
EXAMPLE Since the oxygen reduction system cannot prevent or detect smouldering or pyrolizing processes
(e.g. overheated cables) suitable smoke detection systems for the protected volume e.g. high sensitive smoke
detection systems according to EN 54–20 class A, are recommended and should be part of the main fire alarm
system of the facility.
Where special circumstances deviate from what is covered in this standard, for example spatial
configuration, structure, installations, combustible materials, altitude different from sea level,
temperature different from normal, fumes or gases, require special measures, the designer shall take
these into account. In these cases the appropriate authorities shall be consulted.
5.3 Structural specifications for the protected area
Structural partitions shall comply with the criteria governing the protection target, as shown in Table 1.
Building regulation specifications are unaffected by these measures.
10
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SIST EN 16750:2017
EN 16750:2017 (E)
Table 1 — Structural partitions
Level Protection target Protected Specification Achieved by
volume
Enclosing elements (walls,
floor and roof) shall be
The contents of a room
a
1 shall be protected Room —
sufficiently air tight over the
from internal fires.
life time to protect from
internal fires.
Enclosing elements (walls,
The contents of a room The construction
floor and roof) shall be
shall be protected of fire
a
sufficiently air tight over the
from internal fires and compartments
2 Room
life time and provide
from fires spreading according to the
protection against the spread
from an external relevant
of fire from the surrounding
source. guidelines.
area.
a
Openings shall be constantly sealed or sealable; otherwise the openings shall be reflected in the
calculation of the nitrogen production.
The user should be aware of the relationship between leakage, reduced oxygen air supply and the
system duty cycle.
In the case of oxygen reduction systems all operational openings that are not included in the calculation
of the required levels of oxygen shall be provided with closing mechanisms or monitored via limit
switches. These operational openings include emergency exit doors and other doors, gates etc.
5.4 Oxygen concentration
The following information should be used (where relevant) to determine the design concentration:
— combustible material present (in normal operation and in the case of maintenance work or faults);
— geometry of the combustible materials (e.g. hollow items, thin walls etc.);
— volume of gas contained in combustible materials (e.g. hollow
...
SLOVENSKI STANDARD
oSIST prEN 16750:2014
01-september-2014
9JUDMHQLJDVLOQLVLVWHPL6LVWHPL]]PDQMãDQRNRQFHQWUDFLMRNLVLND3URMHNWLUDQMH
YJUDGQMDQDþUWRYDQMHLQY]GUåHYDQMH
Fixed firefighting systems - Oxygen reduction systems - Design, installation, planning
and maintenance
Ortsfeste Löschanlagen - Sauerstoffreduktionsanlagen - Konstruktion, Einbau, Planung
und Instandhaltung
Installations fixes de lutte contre l’incendie - Systèmes d’appauvrissement en oxygène -
Conception, installation, planification et maintenance
Ta slovenski standard je istoveten z: prEN 16750
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 16750:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 16750:2014
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oSIST prEN 16750:2014
EUROPEAN STANDARD
DRAFT
prEN 16750
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2014
ICS 13.220.20
English Version
Fixed firefighting systems - Oxygen reduction systems - Design,
installation, planning and maintenance
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Löschanlagen - Sauerstoffreduktionsanlagen -
d'appauvrissement en oxygène - Conception, installation, Konstruktion, Einbau, Planung und Instandhaltung
planification et maintenance
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 191.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16750:2014 E
worldwide for CEN national Members.
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Contents
Page
Foreword .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 System requirements .8
4.1 General .8
4.2 Personnel safety .9
4.3 Effectiveness and application .9
4.4 Alarm organization and alarm plan .9
5 Design . 10
5.1 Qualification of the designer . 10
5.2 Fire protection concept . 10
5.3 Structural specifications for the protected area . 10
5.4 Oxygen concentration . 11
5.5 Oxygen reduction for preventative fire protection . 11
5.6 Safety margins . 11
5.7 Oxygen reduced air quantity . 14
5.8 Technical areas . 16
6 Distribution pipework . 17
6.1 Pipework . 17
6.2 Pipe supports . 17
6.3 Components in the pipework . 17
6.4 Injection points . 18
7 Monitoring the oxygen concentration . 18
8 Alarms and notifications . 19
9 Control equipment . 20
9.1 Function . 20
9.2 Requirements . 20
9.3 Electrical power supply . 20
9.4 Electrical installations . 20
9.5 Data recording . 21
10 System operation . 21
10.1 Instruction and training of personnel . 21
10.2 Inspections . 21
10.3 Operations log . 21
10.4 Further obligations . 22
11 Maintenance . 22
12 Documentation . 22
13 Installation . 23
13.1 Qualification of the installer . 23
13.2 General specifications, installation . 23
Annex A (normative) Ignition thresholds for oxygen reduction using nitrogen in fire protection . 24
A.1 Ignition thresholds. 24
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A.2 Tests to ascertain ignition thresholds of unfamiliar materials . 25
Annex B (informative) Information for health and safety – Working in oxygen-reduction
atmospheres for reasons of fire prevention . 28
B.1 General . 28
B.2 Principles of occupational health . 28
B.3 Risk classes . 28
B.4 Basic requirements . 29
B.5 Protective measures for all areas with oxygen-reduced atmospheres . 30
B.6 Risk classes and safety measures . 31
Annex C (informative) Existing national regulations for access and working in areas with lower
oxygen concentration. . 33
Bibliography . 34
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Foreword
This document (prEN 16750:2014) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
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Introduction
Oxygen reduction systems are designed to prevent fires from starting or spreading, by means of the
introduction of oxygen reduced air.
Oxygen reduction systems are not designed to extinguish fires.
The design and installation shall be based on detailed knowledge of the protected area, its occupancy and the
materials in question.
It is important to suit the fire protection measures to the hazard as a whole.
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1 Scope
This European Standard covers oxygen reduction systems that are used as fire prevention systems by
creating an atmosphere in an area which is having a lower permanent oxygen concentration as in ambient
conditions. The level of oxygen reduction is defined by the individual risks of these areas (see Annex A).
Oxygen reduction is achieved by technical systems which are providing a flux of air containing a reduced
concentration of oxygen.
This European Standard specifies minimum requirements and defines the specifications governing the design,
installation and maintenance of fixed oxygen reduction systems with oxygen reduced air in buildings and
industrial production plants. The standard also applies to the extension and modification of existing systems.
This European standard applies to oxygen reduction systems using nitrogen which are designed for continual
oxygen reduction in enclosed spaces.
NOTE Nitrogen is today the most suitable gas to be used for oxygen reduction. For other gases this European
standard can be used as basis.
This European Standard does not apply to oxygen reduction systems that use water mist or combustion
gases.
The European Standard does not apply to:
explosion suppression systems,
explosion prevention systems,
fire extinguishing systems using gaseous extinguishing agents,
inertization of portable containers,
systems in which oxygen levels are reduced for reasons other than fire prevention (e.g. steel processing
in the presence of inert gas to avoid the formation of oxide film),
inerting required during repair work on systems or equipment (e.g. welding) in order to eliminate the risk
of fire or explosion.
In addition to the conditions for the actual oxygen reduction system and its individual components this
European Standard also covers certain structural specifications for the protected area.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 54 (all parts), Fire detection and fire alarm systems
EN 12094-1, Fixed firefighting systems — Components for gas extinguishing systems — Part 1:
Requirements and test methods for electrical automatic control and delay devices
EN 50104, Electrical apparatus for the detection and measurement of oxygen — Performance requirements
and test methods
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Alarms
3.1.1
external alarm
alarm to emergency services such as fire brigade
3.1.2
local alarm
acoustic and possibly additional visual alarm in protected areas or their immediate surroundings
3.1.3
internal alarm
acoustic and visual displays at the detection panel, possibly with additional displays at other signalling
equipment
3.1.4
alarm threshold
value of a process parameter which, when reached, triggers an alarm and, where necessary, initiates
automatic protection measures
3.1.5
alarm signal
signal to warn people at risk and/or to summon help from the emergency services and/or to provide
information about automatic response measures
3.2
design concentration
ingnition threshold including a safety margin
Note 1 to entry: See also Figure 1.
Note 2 to entry: The design concentration represents the maximum oxygen concentration which shall not be exceeded
in any time.
3.3
emergency situation
deviation from normal operation, i.e. a significant deviation from the threshold value (scale of risk)
3.4
operating pressure
pressure of a system under normal operating conditions
3.5
combustible material
combustible material present in the protected area in a significant quantity
Note 1 to entry: The significant quantity is determined by means of a risk analysis as part of the fire protection design.
3.6
ignition threshold
maximum oxygen concentration in a mixture of a combustible material with air and inert gas, in which there
can be no ignition, determined under established test conditions
Note 1 to entry: This is a specific characteristic of combustible material and inert gas (see Annex A.1).
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3.7
detection and alarm installation
remote detection system for the reliable detection of risk to people and property
Note 1 to entry: It creates alarm reports from automatic or manually input information, issues these and detects any
faults. The transmission channels for information and alarms are monitored. Special measures are in place to prevent any
malfunction as far as possible, which may be powered electrically or otherwise. Detection and alarm systems cover
facilities for the input, transmission (through wires or wirelessly), processing and issuing of alarms, including the necessary
power supply. This standard applies to detection and alarm systems which detect and report the scale of the risk at an
early stage.
3.8
normal operation
situation in which the equipment, protection systems and components are able to carry out their designated
functions within their design parameters
3.9
oxygen reduced air
ambient air with an oxygen concentration lower than natural air at sea level
3.10
oxygen reduced air supply
nitrogen enriched air stream with an oxygen concentration of less than natural air ready to be introduced into a
protected volume
3.11
oxygen reduction
reduction of oxygen which increases the nitrogen concentration to prevent the ignition or spread of fire
3.12
protected volume
effective volume of the space to be protected
3.13
system
combination of components whose function and compatibility guarantees the safety of the installation
3.14
technical areas
areas where either or the control panel, nitrogen production unit and other relevant system components are
placed
3.15
control panel
electrical device for monitoring, controlling and alarm of the oxygen reduction system
4 System requirements
4.1 General
An oxygen reduction system shall consist basically of:
a) a supply of oxygen reduced air;
b) a fixed pipework system with fittings, valves, nozzles/outlets;
c) oxygen concentration sensors and control panel;
d) alarms.
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Oxygen reduced air is produced by air seperation or by injecting inert gas or gas mixture into the protected
area.
The oxygen concentration in the protected area shall be monitored by means of measuring equipment. During
operation the supply shall be controlled automatically according to demand. Where necessary additional
means shall be provided to operate the supply manually or an additional supply operated manually or
automatically.
The oxygen reduction system can be equipped with automatic equipment designed to shut down machinery
and to close fire doors and other equipment, with the aim of creating and maintaining the required oxygen
concentration.
4.2 Personnel safety
Oxygen reduced air can be dangerous for personnel.
Adherence to this European Standard does not remove the user's statutory responsibility to comply with the
relavant national bodies / law. In case no national laws exist, further information can be found in Annex B.
Personnel safety measures shall be made for the fact that neighbouring volumes can have a reduced oxygen
concentration. These areas may also need to be monitored and/or personnel safety measures may need to be
taken.
Technical or organizational measures shall be taken to prevent unauthorized people from entering protected
areas with permanently reduced oxygen levels.
The measurement system shall be designed in such a way that a loss of function or a measurement error can
in no event lead to the minimum oxygen threshold not being detected.
The spreading of the oxygen-reduced atmosphere to other areas not intended for this (e.g. through wall
openings, cable ducts, floor drainages, leaking doors, conveyor belts, etc.) shall be prevented.
4.3 Effectiveness and application
A fire risk assessment detailing the key fire protection factors shall be done. The important aspects are:
the type and quantity of material/materials requiring protection;
the area/areas requiring protection;
the right dimension of the oxygen reduced air supply to maintain the reduced oxygen concentration on its
design value;
a back-up oxygen reduced air supply, if provided;
alarm equipment.
Oxygen reduction systems provide preventative fire protection. The introduction of nitrogen reduces the
oxygen concentration of the air, thereby preventing the ignition or spread of fire.
4.4 Alarm organization and alarm plan
An alarm organization is required for the following purposes:
to alert affected and responsible persons;
to alert the fire brigade;
to initiate other necessary protective measures.
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The responsibilities for the alarm organization shall be defined.
The alarm plan should cover key words to designate the basic measures that need to be taken in case of
emergency.
5 Design
5.1 Qualification of the designer
The designer shall be sufficiently technically qualified to ensure effective protection. Where special
circumstances, such as spatial configuration, structure, installations, combustible materials, fumes or gases,
require special measures, the designer shall take these into account. In these cases the appropriate
authorities shall be consulted.
5.2 Fire protection concept
The system design shall be part of the fire safety concept of the building.
As part of the system design a fire risk assessment might lead to further fire protection measures.
NOTE Since the oxygen reduction system cannot prevent or detect smouldering or pyrolizing processes e.g.
overheated cables, suitable smoke detection systems for the protected volume e.g. high sensitive smoke detection
systems according EN 54-20 class A are recommended and should be part of the main fire alarm system of the facility.
5.3 Structural specifications for the protected area
Structural partitions shall comply with the criteria governing the protection target, as shown in Table 1.
Building regulation specifications are unaffected by these measures.
Table 1 — Structural partitions
Level Protection target Protected Specification Achieved by
volume
1 The contents of a room Room Enclosing elements (walls, floor and —
a
shall be protected from roof) shall be sufficiently air tight
internal fires. over the life time to protect from
internal fires.
2 The contents of a room Room Enclosing elements (walls, floor and The construction of
a
shall be protected from roof) shall be sufficiently air tight fire compartments
internal fires and from fires over the life time and provide according to the
spreading from an external protection against the spread of fire relevant guidelines.
source. from the surrounding area.
a
Openings shall be constantly sealed or sealable; otherwise allowances shall be made based on their dimensions.
NOTE The user should be aware of the relationship between leakage, reduced oxygen air supply and the system
duty cycle.
In the case of oxygen reduction systems all operational openings that are not included in the calculation of the
required levels of oxygen shall be provided with closing mechanisms or monitored via limit switches. These
operational openings include emergency exit doors and other doors, gates etc.
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5.4 Oxygen concentration
The following information should be used (where relevant) to determine the design concentration:
combustible material present (in normal operation and in the case of maintenance work/faults);
geometry of the combustible materials (e.g. hollow items, thin walls);
volume of gas contained in combustible materials (e.g. hollow parts, densely packed storage items);
temperatures and pressures in the protected area;
safety margin between oxygen concentrations established experimentally and the oxygen concentrations
required for the design of the oxygen reduction system.
5.5 Oxygen reduction for preventative fire protection
NOTE Ignition can only be prevented in protected areas if the oxygen concentration within the protected area does
not exceed the design concentration. If this level is exceeded, the protection objective of "fire prevention" can no longer be
guaranteed.
If different combustible materials are present in the protected area the lowest ignition threshold (i.e. the most
ignitable material in its most ignitable geometry) shall be taken as the basis for determining the design
concentration. In individual cases additional tests can be carried out to establish ignition thresholds for
combustible materials in the forms and geometry in which the materials are actually present.
Ignition thresholds for oxygen reduction using nitrogen for various applications are given in A.1. Values
obtained with mixtures of other gas components can differ from these figures. These concentrations are
determined under the specific test conditions described in A.2.
Concentrations other than those shown in Table A.1 can be achieved and allowed when validated by test
reports in accordance with A.2 from international recognized laboratories.
Materials not listed in Table A.1 should be tested in accordance with the test in A.2 by an independent,
international recognized laboratory.
If the procedures described in A.2 is not applicable the ignition threshold shall be determined by an
independent, international recognized laboratory. The design of oxygen reduction systems shall take into
account the ignition levels and the safety margins described in 5.6. This design concentration shall not be
exceeded anywhere in the protected area. In case of any fault arising action shall be taken according to the
emergency plan (see 5.7.2).
WARNING — Where stored goods may allow a large amount of oxygen to enter the warehouse, the
test structure and the test described in A.2 may not be sufficient. In such cases an appropriate design
concentration shall be agreed with the authorized body. Such cases might include e.g. warehouses
containing toilet paper or clothing in bales.
5.6 Safety margins
The safety margin for oxygen reduction systems shall be set at 0,75 % oxygen by volume.
The difference between the design concentration and the warning threshold or warning threshold and
operating range is established according to the combustible materials, operation and fault related fluctuations
in time and place of the inert gas concentration, the time needed for protection measures and emergency
action to take effect and the tolerance of the oxygen monitoring facilities.
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Action is taken as follows:
a) Ignition threshold
Safety margin, 0,75 % oxygen by vol.
b) Design concentration
Sensor tolerance: This margin covers the technical measuring errors.
c) Warning threshold for maximum oxygen concentration
Operating margin 1: this margin takes into account the operational fluctuations in time and place of the
oxygen concentration to avoid false warnings, related to the warning threshold for maximum oxygen
concentration (see Clause 4)
Operating margin 2: this margin takes into account the delay before protective measures take effect and
alarm delays of the measuring device monitoring the oxygen concentration. Operation margin 2 is
dependent on the system configuration, the emergency concept and the expected hold time.
d) Oxygen reduced air ON
Working range high: this margin ensures a sufficient cycle time for the operation of the oxygen reduced
air supply.
e) Target value for the oxygen concentration
Working range low: this margin ensures a sufficient cycle time for the operation of the oxygen reduced air
supply.
f) Oxygen reduced air OFF
Operating margin 3: this margin takes into account the delay before protective measures take effect and
alarm delays of the device monitoring the oxygen concentration. Operation margin 3 is dependent on the
system configuration and the emergency concept.
g) Pre-alarm threshold for minimum oxygen concentration
Operating margin 4: this margin determines the alarm value for the minimum oxygen concentration to
avoid false alarms.
h) Alarm threshold for minimum oxygen concentration
Figure 1 shows the above points in a control diagram.
NOTE The alarm threshold for minimum oxygen concentration is defined by national regulation / law. See also
Annex B.
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Key
X time Y O concentration
2
1 design value
...
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