SIST EN 12259-14:2020+A1:2022
(Main)Fixed firefighting systems - Components for sprinkler and water spray systems - Part 14: Sprinklers for residential applications
Fixed firefighting systems - Components for sprinkler and water spray systems - Part 14: Sprinklers for residential applications
This document specifies requirements for the construction and performance of residential sprinklers as well as test methods for their type approval, which are operated by a change of state of an element or bursting of a glass bulb under the influence of heat, for use only in automatic sprinkler systems for domestic and residential applications as defined in EN 16925:− .
This standard does not cover representative fire and other tests for special sprinklers that are intended to provide for specific fire hazards, nor does it cover fire and other tests for sprinklers for commercial and industrial sprinkler systems as in EN 12845. Those test requirements are covered by EN 12259-1.
NOTE 1 All pressure data in this European Standard are given as gauge pressures in bar.
NOTE 2 Sprinklers according to EN12259-1 can also be used in residential and domestic applications if the system is designed according to EN 12845.
Ortsfeste Brandbekämpfungsanlagen - Bauteile für Sprinkler- und Sprühwasseranlagen - Teil 14: Sprinkler für die Anwendung im Wohnbereich
Dieses Dokument legt Anforderungen an die Konstruktion und Leistung von Wohnraumsprinklern für die ausschließliche Verwendung in automatischen Sprinkleranlagen für den Wohn- und Hausgebrauch, wie in EN 16925 festgelegt, die dadurch öffnen, dass sich bei Erwärmung der Zustand eines Elements ändert oder ein Glasfass zerspringt, sowie Prüfverfahren für deren Bauartzulassung fest.
Dieses Dokument deckt weder repräsentative Brand- und andere Prüfungen für spezielle Sprinkler, die für besondere Brandgefahren vorgesehen sind, noch Brand- und andere Prüfungen für Sprinkler für handelsübliche und industrielle Sprinkleranlagen nach EN 12845 ab. Diese Prüfanforderungen sind durch EN 12259 1 abgedeckt.
ANMERKUNG 1 Alle Drücke in diesem Dokument werden als Überdrücke in Bar angegeben.
ANMERKUNG 2 Sprinkler nach EN 12259 1 können auch für den Wohn- und Hausgebrauch eingesetzt werden, wenn die Anlage nach EN 12845 ausgelegt ist.
Installations fixes de lutte contre l'incendie - Composants des systèmes d'extinction du type sprinkleur et à pulvérisation d'eau - Partie 14: Sprinkleurs pour applications résidentielles
Le présent document spécifie les exigences relatives à la construction et aux performances des sprinkleurs résidentiels, ainsi que les méthodes d’essai en vue de leur homologation de type, ces sprinkleurs étant déclenchés par un changement d’état d’un élément ou l’éclatement d’une ampoule de verre sous l’effet de la chaleur. Ces exigences et méthodes d’essai s’appliquent uniquement aux systèmes d’extinction automatique de type sprinkleurs à usage domestique et résidentiel, tels que définis dans l’EN 16925 ).
La présente norme ne couvre ni les essais au feu et autres essais représentatifs des sprinkleurs spéciaux destinés à prévenir des risques d’incendie particuliers, ni les essais au feu et autres essais des sprinkleurs des systèmes d’extinction de type sprinkleurs à usages commerciaux et industriels spécifiés dans l’EN 12845. Ces exigences d’essai sont traitées dans l’EN 12259-1.
NOTE 1 Toutes les valeurs de pression manométrique figurant dans la présente Norme européenne sont exprimées en bar.
NOTE 2 Les sprinkleurs conformes à l’EN 12259-1 peuvent également être utilisés dans les applications résidentielles et domestiques, à condition que le système soit conçu conformément à l’EN 12845.
Vgrajene naprave za gašenje - Sestavni deli sprinklerskih sistemov in sistemov s pršečo vodo - 14. del: Sprinklerji za uporabo v stanovanjih (vključno z dopolnilom A1)
Ta dokument določa zahteve za konstrukcijo in izvedbo ter preskusne metode za tipsko odobritev sprinklerjev za uporabo v stanovanjih, ki delujejo po načelu spremembe stanja elementa oziroma razbitja steklenega mehurčka pod vplivom toplote. Sprinklerji so namenjeni za uporabo samo v avtomatskih sprinklerskih sistemih za bivalne površine, kot je opredeljeno v standardu EN 16925.
Standard ne zajema reprezentativnih protipožarnih in drugih preskusov za posebne sprinklerje, namenjene preprečevanju določenih nevarnosti požara, niti požarnih in drugih preskusov za sprinklerje za uporabo v komercialnih oziroma industrijskih sprinklerskih sistemih, kot je opredeljeno v standardu EN 12845. Ti preskusi so zajeti v standardu EN 12259-1.
OPOMBA 1: Vsi podatki o tlaku v tem evropskem standardu so podani kot tlačne vrednosti merilnika v barih.
OPOMBA 2: Sprinklerje, skladne s standardom EN 12259-1, je mogoče za bivalne površine uporabljati tudi, če je sistem zasnovan v skladu s standardom EN 12845.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12259-14:2020+A1:2022
01-julij-2022
Vgrajene naprave za gašenje - Sestavni deli sprinklerskih sistemov in sistemov s
pršečo vodo - 14. del: Sprinklerji za uporabo v stanovanjih (vključno z dopolnilom
A1)
Fixed firefighting systems - Components for sprinkler and water spray systems - Part 14:
Sprinklers for residential applications
Ortsfeste Brandbekämpfungsanlagen - Bauteile für Sprinkler- und Sprühwasseranlagen -
Teil 14: Sprinkler für die Anwendung im Wohnbereich
Installations fixes de lutte contre l'incendie - Composants des systèmes d'extinction du
type sprinkleur et à pulvérisation d'eau - Partie 14: Sprinkleurs pour applications
résidentielles
Ta slovenski standard je istoveten z: EN 12259-14:2020+A1:2022
ICS:
13.220.10 Gašenje požara Fire-fighting
SIST EN 12259-14:2020+A1:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 12259-14:2020+A1:2022
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SIST EN 12259-14:2020+A1:2022
EN 12259-14:2020+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 13.220.20 Supersedes EN 12259-14:2020
English Version
Fixed firefighting systems - Components for sprinkler and
water spray systems - Part 14: Sprinklers for residential
applications
Installations fixes de lutte contre l'incendie - Ortsfeste Brandbekämpfungsanlagen - Bauteile für
Composants des systèmes d'extinction du type Sprinkler- und Sprühwasseranlagen - Teil 14: Sprinkler
sprinkleur et à pulvérisation d'eau - Partie 14: für die Anwendung im Wohnbereich
Sprinkleurs pour applications résidentielles
This European Standard was approved by CEN on 4 November 2019 and includes Amendment 1 approved by CEN on 13 March
2022.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12259-14:2020+A1:2022 E
worldwide for CEN national Members.
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SIST EN 12259-14:2020+A1:2022
EN 12259-14:2020+A1:2022 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Construction and performance . 8
4.1 General . 8
4.2 Dimensions and pressure rating . 8
4.3 Nominal operating temperature . 8
4.4 Operating temperatures . 9
4.5 Water flow and distribution . 9
4.6 Function . 10
4.7 Fire Test . 10
4.8 Strength of sprinkler body and deflector . 11
4.9 Strength of release element. 11
4.10 Leak resistance and hydrostatic strength . 12
4.11 Heat exposure . 12
4.12 Corrosion . 13
4.13 Water hammer . 13
4.14 Thermal response . 14
4.15 Resistance to vibration . 14
4.16 Resistance to impact . 14
4.17 Resistance to low temperature . 14
4.18 Resistance to heat . 14
4.19 Test conditions . 14
5 Marking . 14
5.1 General . 14
5.2 Identification number . 14
5.3 Nominal operating temperature and year of manufacture . 15
5.4 Manufacturing location . 15
5.5 Heat sensitive element supplier . 15
5.6 Protective covers . 15
5.7 Sidewall sprinklers . 15
5.8 Concealed sprinklers . 15
5.9 Removable recessed housing . 16
6 Instruction charts. 16
6.1 General . 16
6.2 Installation Instructions . 16
Annex A (normative) Conditions for tests . 18
Annex B (normative) Water flow test . 19
Annex C (normative) Water distribution test . 21
Annex D (normative) Fire test . 27
Annex E (normative) Function test . 37
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Annex F (normative) Strength of sprinkler body and deflector . 39
Annex G (normative) Strength of release elements test . 41
Annex H (normative) Leak resistance tests . 44
Annex I (normative) Heat exposure . 45
Annex J (normative) Glass bulb sprinkler thermal shock test . 46
Annex K (normative) Exposure and corrosion tests . 47
Annex L (normative) Water hammer test . 51
Annex M (normative) Thermal response test. 52
Annex N (normative) Vibration test . 57
Annex O (normative) Impact test . 58
Annex P (normative) Resistance to low temperature test . 59
Annex Q (normative) Resistance to high temperature test . 60
Bibliography . 61
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SIST EN 12259-14:2020+A1:2022
EN 12259-14:2020+A1:2022 (E)
European foreword
This document (EN 12259-14:2020+A1:2022) 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 November 2022, and conflicting national standards
shall be withdrawn at the latest by November 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document includes Amendment 1 approved by CEN on 13 March 2022.
This document supersedes !EN 12259-14:2020".
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!In comparison with EN 12259-14:2020, technical modifications have been made to clarify the types
of sprinkler seal that are covered by this document."
It is included in a series of European Standards planned to cover:
— automatic sprinkler systems (EN 12259 and EN 12845);
— gas extinguishing systems (EN 12094);
— powder systems (EN 12416);
— foam systems (EN 13565);
— hydrant and hose reel systems (EN 671);
— smoke and heat control systems (EN 12101).
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
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EN 12259-14:2020+A1:2022 (E)
1 Scope
!This document specifies requirements for the construction and performance of residential
sprinklers as well as test methods for their type approval, which are operated by a change of state of an
element or bursting of a glass bulb under the influence of heat and incorporating the following types of
water seals:
— conical metal spring with a PTFE gasket or coating;
— metal cap or disc with PTFE gasket or coating;
— copper gasket, with or without a PTFE coating.
Sprinklers in accordance with this document are only used in automatic sprinkler systems for domestic
and residential applications as defined in EN 16925."
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.
1
!EN 12259-1:1999+A1:2001 ", Fixed firefighting systems — Components for sprinkler and water
spray systems — Part 1: Sprinklers
EN 13501-1, Fire classification of construction products and building elements - Part 1: Classification
using data from reaction to fire tests
EN 16925, Fixed firefighting systems - Automatic residential sprinkler systems - Design, installation and
maintenance
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 49, Malleable cast iron fittings threaded to ISO 7-1
ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1
ISO 5658-2:2006, Reaction to fire tests — Spread of flame — Part 2: Lateral spread on building and
transport products in vertical configuration
ISO 5660-1:2015, Reaction-to-fire tests — Heat release, smoke production and mass loss rate — Part 1:
Heat release rate (cone calorimeter method) and smoke production rate (dynamic measurement)
UL 723, Standard for test for surface burning characteristics of building materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
1
!As impacted by EN 12259-1:1999+A1:2001/A2:2004 and EN 12259-1:1999+A1:2001/A3:2006."
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3.1
concealed sprinkler
unit (pre-assembled or assembled on site) consisting of a nozzle with a thermally sensitive sealing
device, a housing and a cover plate, that ensures that the sprinkler will be installed with all or part of
the thermally sensitive element behind the plane of the ceiling
3.2
recessed sprinkler
unit (pre-assembled or assembled on site) consisting of a nozzle with a thermally sensitive sealing
device and a housing, that ensures that the sprinkler will be installed with all or part of the thermally
sensitive element above the plane of the ceiling
3.3
discharge coefficient
known as K-factor
coefficient of discharge in the formula,
Q = K √ p (1)
where
Q is the flow in litres per minute, and
p is the pressure in bar
3.4
dry-type sprinkler
nozzle with a thermally sensitive sealing device secured in an extension nipple that has a seal at the
inlet end to prevent water from entering the nipple until the sprinkler operates
3.5
flush sprinkler
unit consisting of a nozzle with a thermally sensitive sealing device and housing, that ensures that the
sprinkler will be installed partly behind, but with the temperature sensitive element before, the finished
plane of the ceiling or wall
3.6
heat responsive element
portion of a sprinkler that breaks, melts, or otherwise functions to initiate the automatic operation of
the sprinkler when exposed to sufficient heat
3.7
heptane
commercial grade heptane having the following characteristics:
a) minimum Initial Boiling Point of 88 °C;
b) maximum Dry Point of 100 °C; and
c) specific Gravity (15,6 °C/15,6 °C) of 0,68 - 0,73.
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3.8
orifice
opening that controls the amount of water discharged from a sprinkler at a given pressure
3.9
pendent sprinkler
nozzle with a thermally sensitive sealing device intended to be installed so that its deflector is located
below the orifice and the water flows downward through the orifice
3.10
residential sprinkler
nozzle with a thermally sensitive sealing device intended to be installed only in residential occupancies
as defined in EN 16925
3.11
sidewall sprinkler
nozzle with a thermally sensitive sealing device intended for installation on or near the wall
3.12
upright sprinkler
nozzle with a thermally sensitive sealing device intended to be installed so that its deflector is located
above the orifice
3.13
response time index
RTI
½ ½
measure of the thermal sensitivity of the sprinkler expressed in (meters.seconds) (m×s)
Note 1 to entry: Unlike in EN12259–1, the RTI value is calculated without considering the conductivity factor
3.14
design lower tolerance limit
DLTL
glass bulb supplier’s specified and assured lowest lower tolerance limit
3.15
design upper tolerance limit
DUTL
sprinkler supplier’s specified and assured highest upper tolerance limit
3.16
fusible link sprinkler
nozzle with a thermally sensitive sealing device which opens when an element provided for that
purpose melts
3.17
glass bulb sprinkler
nozzle with a thermally sensitive sealing device which opens when a liquid-filled glass bulb bursts
3.18
mean design service load
sprinkler supplier’s specified and assured highest mean service load for any batch of 10 or more
sprinklers
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3.19
mean design strength
glass bulb supplier’s specified and assured lowest mean bulb strength for any batch of 55 or more bulbs
3.20
horizontal sprinkler
nozzle with a thermally sensitive sealing device in which the nozzle directs the water horizontally
3.21
lower tolerance limit
LTL
glass bulb lowest strength determined by test and statistical analysis of a batch of 55 or more bulbs
3.22
supplier
company responsible for the design, manufacture and quality assurance of a product
3.23
upper tolerance limit
UTL
highest service load determined by test and statistical analysis of a batch of 20 or more sprinklers
3.24
frame arms
part of a sprinkler that maintains the thermally sensitive element in load bearing contact with the
sprinkler head valve
4 Construction and performance
4.1 General
Sprinklers shall only be assembled in such a way that adjustment or dismantling will result in
destruction of an element of construction.
It shall be possible to remove the cover of a concealed sprinkler without having to use special tools, e.g.
for visual inspections.
4.2 Dimensions and pressure rating
4.2.1 Dimensions
Nominal thread sizes shall be suitable for fittings threaded in accordance with ISO 7-1.
It shall be possible for a sphere of (5,0 +0,01/-0) mm diameter to pass through the orifice of the
sprinkler.
4.2.2 Pressure ratings
A residential sprinkler shall have a maximum operating pressure of at least 12 bar.
4.3 Nominal operating temperature
When tested in accordance with “Test to determine operating temperatures of fusible link sprinklers
and glass bulb sprinklers” of !EN 12259-1:1999+A1:2001", sprinklers shall operate at a
temperature within the range:
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EN 12259-14:2020+A1:2022 (E)
o
T = [t ± (0,035 t +0,62)] C
test
where
t is the nominal operating temperature.
When cover plates are tested in accordance with the “Test to determine operating temperatures of
fusible link sprinklers and glass bulb sprinklers” of !EN 12259-1:1999+A1:2001", cover plates
shall operate at a temperature within the range:
o
T = [t ± (0,035 t +0,62)] C
test cover
where
t is the nominal operating temperature of the cover.
cover
This temperature t shall be 8 °C to 20 °C lower than the nominal operating temperature of its
cover
sprinkler head.
4.4 Operating temperatures
The temperature classification, temperature rating, and colour coding of a residential sprinkler shall be
as specified in Table 1.
Table 1 — Nominal operating temperatures and colour codes
Glass bulb sprinklers Fusible link sprinklers
Nominal operating Liquid Nominal operating Frame arms
temperature colour code temperature within colour code
°C range
°C
57 Orange 57 to 77 uncoloured
68 Red 80 to 107 white
79 Yellow
93 Green
100 Green
4.5 Water flow and distribution
4.5.1 K-factor
The nominal K-factor shall be specified by the supplier. The K-factor of the sprinklers shall be within the
nominal value ± 5 % for other than dry sprinklers and ± 8 % for dry sprinklers, when determined in
accordance with Annex B.
4.5.2 Water distribution
4.5.2.1 Water distribution test – Horizontal surface
When installed in accordance with the installation instructions and tested as described in C.1 a
residential sprinkler shall distribute water over a horizontal surface so that the discharge density for
any pan within the design area (the maximum area the sprinkler is intended to protect) shall be at least
0,8 mm/min except that:
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a) no more than 2 pans (0,5 m × 0,5 m) or not more than 4 pans (0,3m × 0,3m) for each quadrant shall
be allowed to be at least 0,6 mm/min for upright and pendant sprinklers; and
b) no more than 8 pans (0,3 m × 0,3 m) or 3 pans (0,5 m × 0,5 m) shall be allowed to be at least
0,6 mm/min for each half (split along the sprinkler centreline) of the maximum area a sidewall
sprinkler is intended to protect
4.5.2.2 Water distribution test – Vertical surface
When installed in accordance with the installation instructions and tested as described in C.2, a
residential sprinkler shall distribute water in a uniform manner over vertical surfaces as follows:
a) walls within the coverage area shall be completely wetted to at least within 711 mm of the ceiling
with one sprinkler discharging water at the specified design flow rate;
b) for square coverage areas, each wall within the coverage area shall be wetted with at least 5 % of
the sprinkler flow; for rectangular coverage areas, each wall within the coverage area shall be
wetted with a proportional water amount based on 20 % of the total sprinkler discharge in
accordance with the following formula
WW – 20 % (D / P) (2)
where
WW is required amount of water collected on a wall, in %;
D is wall length, in m;
P is total perimeter of coverage area, in m.
4.5.3 Water Impingement Test
When tested in accordance with Annex C and while discharging water at a service pressure of 5,2 bar
less than the maximum operating pressure, a residential sprinkler shall not prevent the operation of an
adjacent residential sprinkler.
4.6 Function
When tested in accordance with Annex E each of the residential sprinklers shall operate at service
pressures of 0,5 bar to the maximum operating pressure. The sprinkler shall open and within 5 s of
release of the thermally sensitive element shall operate satisfactorily. Any lodgement of released parts
shall be cleared within 60 s of the release of the thermally sensitive element. After testing in accordance
with Annex E the sprinkler shall conform to the requirements of 4.5.2.
NOTE In most instances visual examination of the equipment will be sufficient to establish conformity with the
requirements of 4.5.2.
4.7 Fire Test
When fire tested as described in Annex D a residential sprinkler shall limit temperatures as specified
below when tested at each spacing referenced in the installation instructions. Additionally, a maximum
of two residential sprinklers shall operate and the third sprinkler, located near the 1 000 mm wide
doorway, shall not operate. The sprinklers shall limit temperatures as follows:
a) The maximum temperature measured 76 mm below the ceiling at locations 4 and 5 as illustrated in
Figure D.1, Figure D.2 and Figure D.3 shall not exceed 316 °C.
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b) The maximum temperature measured 1,6 m above the floor at location 4 shall not exceed 93 °C.
c) The temperature at the location described in (b) shall not exceed 54 °C for more than any
continuous 2 min period.
d) The maximum ceiling material temperature measured 6 mm behind the finished ceiling surface
shall not exceed 260 °C.
NOTE The thermocouple 76 mm below the ceiling, located above the fire source, is for reference purposes
only.
See Figure D.1, (pendant, upright, flush, recessed pendant, and concealed sprinklers) or Figure D.2 and
Figure D.3 (sidewall sprinklers) for temperature measuring locations.
4.8 Strength of sprinkler body and deflector
4.8.1 Strength of frame
The sprinkler body shall not show permanent elongation of more than 0,2 % between the load-bearing
parts when subjected to twice the average service load when tested in accordance with F.1.
4.8.2 Flow endurance
A residential sprinkler shall withstand for 30 min, without evidence of cracking, deformation, or
separation of any part when tested in accordance with F.2.
4.8.3 Strength of deflector
The sprinkler deflector and its supporting parts shall withstand an applied force of 70 N without
permanent deformation when tested in accordance with F.3.
4.9 Strength of release element
4.9.1 Glass bulb sprinklers
When evaluated and tested in accordance with Annex G, glass bulb sprinklers shall have:
a) a mean design bulb strength of at least six times the mean design service load;
b) a mean bulb strength not less than the mean design bulb strength;
c) a mean service load not more than the mean design service load;
d) a design lower tolerance limit (DLTL) on the distribution curve of at least two times the design
upper tolerance limit (DUTL) of the service load distribution curve;
e) an upper tolerance limit (UTL) less than or equal to the design upper tolerance limit (DUTL);
f) a lower tolerance limit (LTL) greater than or equal to the design lower tolerance limit (DLTL) see
Figure 1.
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EN 12259-14:2020+A1:2022 (E)
Key
1 service load distribution curve
2 bulb strength distribution curve
3 mean service load
4 mean bulb strength
5 upper tolerance limit (UTL)
6 lower tolerance limit (LTL)
A number of samples
B strength (N)
Figure 1 — Graph of service load and bulb strength distribution curves
4.9.2 Fusible link sprinklers
It shall be determined that:
a) the temperature sensitive elements withstand a load of 15 times the maximum design load for a
period of 100 h, without failure; or
b) the estimated time to failure of temperature sensitive elements is not less than 876 600 h at the
design load, when tested in accordance with Annex G.
4.10 Leak resistance and hydros
...
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