ISO 6182-7:2020

Fire protection - Automatic sprinkler systems - Part 7: Requirements and test methods for early suppression fast response (ESFR) sprinklers

This document specifies performance requirements, test methods and marking requirements for pendent early suppression fast response (ESFR) sprinklers. NOTE This document currently provides requirements for K202 and K242 ESFR pendent sprinklers.

Protection contre l'incendie — Systèmes d'extinction automatiques du type sprinkler — Partie 7: Prescriptions et méthodes d'essai des sprinklers de type "extinction précoce/réaction rapide"

General Information

• Status: Withdrawn
• Publication Date: 29-Mar-2020
• ICS: 13.220.20 - Fire protection
• Technical Committee: ISO/TC 21/SC 5 - Fixed firefighting systems using water
• Drafting Committee: ISO/TC 21/SC 5/WG 9 - Sprinklers and nozzles
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 17-Feb-2023
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 13696:2022 - Optics and photonics - Test method for total scattering by optical components
• Effective Date: 06-Jun-2022
• Revises: ISO 6182-7:2004 - Fire protection - Automatic sprinkler systems - Part 7: Requirements and test methods for early suppression fast response (ESFR) sprinklers
• Effective Date: 04-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6182-7
Second edition
2020-03
Fire protection — Automatic sprinkler
systems —
Part 7:
Requirements and test methods
for early suppression fast response
(ESFR) sprinklers
Protection contre l'incendie — Systèmes d'extinction automatiques du
type sprinkler —
Partie 7: Prescriptions et méthodes d'essai des sprinklers de type
"extinction précoce/réaction rapide"
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
3.1 General . 1
3.2 Types of sprinklers according to type of heat responsive element . 3
3.3 Sprinklers classified according to position. 3
4 Product consistency . 3
4.1 Quality control program . 3
4.2 Leak resistance testing . 3
4.3 Glass bulb integrity test . 3
5 Product assembly. 4
5.1 General . 4
5.2 Dynamic O-ring seals . 4
5.3 Rated pressure . 4
6 Requirements . 4
6.1 Dimensions . 4
6.1.1 Orifice size . 4
6.1.2 Nominal thread sizes . 4
6.2 Temperature ratings and color codings. 4
6.3 Operating temperature (see 7.3) . 5
6.4 Water flow constant (see 7.4) . 5
6.5 Water distribution (see 7.5) . 5
6.6 Function (see 7.6) . 7
6.6.1 Lodgement (see 7.6.1) . . 7
6.6.2 Deflector strength (see 7.6.2) . 7
6.7 Service load and strength of sprinkler body (see 7.7) . 8
6.8 Strength of heat-responsive element (see 7.8) . 8
6.9 Leak resistance and hydrostatic strength (see 7.9) . 9
6.10 Heat exposure (see 7.10) . 9
6.10.1 Glass bulb sprinklers (see 7.10.1) . 9
6.10.2 All sprinklers (see 7.10.2) . 9
6.11 Thermal shock for glass bulb sprinklers (see 7.11) . 9
6.12 Corrosion . 9
6.12.1 Stress corrosion for copper-based alloy components (see 7.12.1) . 9
6.12.2 Sulfur-dioxide/carbon-dioxide corrosion (see 7.12.2) . 9
6.12.3 Hydrogen sulfide corrosion (see 7.12.3) . 9
6.12.4 Salt spray loading (see 7.12.4) .10
6.12.5 Moist-air exposure (see 7.12.5) .10
6.13 Water hammer (see 7.13) .10
6.14 Dynamic heating (see 7.14) .10
6.15 Resistance to heat (see 7.15) .10
6.16 Vibration (see 7.16) .10
6.17 Impact (see 7.17) .10
6.18 Rough usage (see 7.18) .11
6.19 Lateral discharge (see 7.19) .11
6.20 Thirty-day leakage resistance (see 7.20) .11
6.21 Vacuum resistance (see 7.21).11
6.22 Freezing (see 7.22) .11
6.23 Actual delivered density (ADD) (see 7.23) .11
6.24 Thrust force measurements (see 7.24) .12
6.25 Dezincification of brass components (see 7.25) .12
6.26 Stainless steel components (see 7.26) . .12
6.27 Protective covers (see 7.27) .13
7 Test methods .13
7.1 General conditions .13
7.2 Examination.13
7.2.1 Preliminary examination .13
7.2.2 Visual examination .13
7.3 Operating temperature test (see 6.3) .13
7.3.1 Test of static operation .13
7.4 Water flow constant test (see 6.4) .16
7.5 Water distribution tests (see 6.5) .17
7.6 Function test (see 6.6) .22
7.6.1 Lodgement test (see 6.6.1) .22
7.6.2 Deflector strength test (see 6.6.2) .26
7.7 Service load and strength of sprinkler body (see 6.7) .26
7.7.1 Test option 1 .26
7.7.2 Test option 2 .26
7.7.3 Test option 3 .27
7.8 Strength of heat-responsive element test (see 6.8).27
7.8.1 Glass bulbs .27
7.8.2 Fusible elements .27
7.9 Leak resistance and hydrostatic strength tests (see 6.9) .28
7.10 Heat exposure test (see 6.10) .28
7.10.1 Glass bulb sprinklers (see 6.10.1) .28
7.10.2 All sprinklers (see 6.10.2) .28
7.11 Thermal shock test for glass bulb sprinklers (see 6.11) .29
7.12 Corrosion tests .29
7.12.1 Stress corrosion for copper-based alloy components test (see 6.12.1) .29
7.12.2 Sulfur dioxide/carbon dioxide corrosion test (see 6.12.2) .29
7.12.3 Hydrogen sulfide corrosion test (see 6.12.3) .30
7.12.4 Salt spray loading test (see 6.12.4) .30
7.12.5 Moist air exposure test (see 6.12.5) .31
7.13 Water-hammer test (see 6.13) .31
7.14 Dynamic heating test (see 6.14) .31
7.14.1 Plunge test .31
7.14.2 RTI value calculation .32
7.15 Resistance to heat test (see 6.15) .32
7.16 Vibration test (see 6.16) .32
7.17 Impact test (see 6.17) .33
7.18 Rough usage test (see 6.18) .33
7.19 Lateral discharge test (see 6.19) .33
7.20 Thirty-day leakage test (see 6.20) .34
7.21 Vacuum test (see 6.21) .35
7.22 Freezing test (see 6.22) .35
7.23 Actual delivered density (ADD) test (see 6.23).35
7.24 Thrust force test (see 6.24) .36
7.25 Dezincification of brass components (see 6.25) .37
7.26 Stainless steel components (see 6.26) . .38
7.26.1 Stress corrosion — Magnesium chloride .38
7.26.2 Stress corrosion — Magnesium chloride test .38
7.27 Protective cover impact test for glass bulb sprinklers (see 6.27) .39
8 Marking of sprinklers .40
8.1 Sprinklers .40
8.2 Protective covers .41
9 Manufacturer’s installation instructions .41
iv © ISO 2020 – All rights reserved

Annex A (normative) Tolerance limit calculation methods .42
Annex B (informative) Analysis of the strength test for fusible element .44
Annex C (normative) Tolerances .45
Bibliography .46
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 of 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 www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 5, Fixed firefighting systems using water.
This second edition cancels and replaces the first edition (ISO 6182-7:2004), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— added requirements and test methods for K242 pendent ESFR sprinklers.
A list of all parts in the ISO 6182 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
vi © ISO 2020 – All rights reserved

Introduction
Early Suppression-Fast Response (ESFR) sprinklers are a unique type of sprinkler primarily intended to
provide sprinkler protection for storage facilities. Other types of sprinklers are addressed in separate
documents in the ISO 6182 series. These sprinklers are specifically designed to discharge water at a
location near the ceiling of a structure in a manner that effectively attacks a fast-growing fire that can
occur in a storage facility.
These sprinklers characteristically discharge water in a mostly downward trajectory with relatively
large water droplets and incorporate a fast-response type heat responsive element intended to allow
the discharge of water at an early stage of the fire growth. Due to the relatively quick operation
and effective nature of the sprinkler discharge, these sprinklers can be used to provide ceiling-only
sprinkler protection for taller storage facilities compared to other types of sprinklers. The performance
of ESFR sprinklers is sensitive to obstructions to the sprinkler discharge. ESFR sprinkler installation
guidelines need to account for this obstruction sensitivity by limiting the size of obstructions as well as
specifying sprinkler installation locations that minimize the impact of these obstructions.
INTERNATIONAL STANDARD ISO 6182-7:2020(E)
Fire protection — Automatic sprinkler systems —
Part 7:
Requirements and test methods for early suppression fast
response (ESFR) sprinklers
1 Scope
This document specifies performance requirements, test methods and marking requirements for
pendent early suppression fast response (ESFR) sprinklers.
NOTE This document currently provides requirements for K202 and K242 ESFR pendent sprinklers.
2 Normative reference
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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 General
3.1.1
actual delivered density
ADD
rate at which water is deposited from an operating sprinkler onto the top horizontal surface of a
simulated burning combustible array
3.1.2
assembly load
force exerted on the sprinkler body excluding hydrostatic pressure
3.1.3
average design strength
glass bulb supplier’s specified and assured lowest average axial design strength of any batch of 50 bulbs
3.1.4
design load
force exerted on the release element at the service load (3.1.10) of the sprinkler
3.1.5
early suppression fast response automatic sprinkler
ESFR
sprinkler that is intended to provide early suppression of a fire when installed on the appropriate
sprinkler piping
3.1.6
orientation A
orientation with the airflow perpendicular to both the waterway axis and the plane of the frame arms
and with the heat responsive element upstream of the frame arms
Note 1 to entry: See Figure 1.
3.1.7
orientation B
orientation with the airflow perpendicular to both the waterway axis and the plane of the frame arms
and with the heat responsive element downstream of the frame arms
Note 1 to entry: See Figure 1.
a) Orientation A
b) Orientation B
Key
1 tunnel test section (elevation view)
a
Airflow.
Figure 1 — Orientations A and B
3.1.8
protective covers
protective caps or straps intended to provide temporary protection for sprinklers during shipping,
handling and installation
3.1.9
response time index
RTI
measure of sprinkler sensitivity
RTIt= u
2 © ISO 2020 – All rights reserved

where
t is equal to the time constant, expressed in seconds, of the heat-responsive element;
u is the gas velocity, expressed in metres per second.
0,5
Note 1 to entry: The RTI is expressed in units of (m·s) .
3.1.10
service load
combined force exerted on the sprinkler body by the assembly load (3.1.2) of the sprinkler and the
equivalent force of the rated pressure on the inlet
3.1.11
sprinkler
thermosensitive device designed to react at a predetermined temperature by automatically releasing a
stream of water and distributing it in a specified pattern and quantity over a designated area
Note 1 to entry: For the purposes of this document, "sprinkler" is intended to refer to ESFR (3.1.5) sprinklers.
3.2 Types of sprinklers according to type of heat responsive element
3.2.1
fusible element sprinkler
sprinkler that opens under the influence of heat by the melting of a component
3.2.2
glass bulb sprinkler
sprinkler that opens under the influence of heat by the bursting of the glass bulb through pressure
resulting from expansion of the fluid enclosed therein
3.3 Sprinklers classified according to position
3.3.1
pendent sprinkler
sprinkler arranged in such a way that the water stream is directed downwards against the
distribution plate
4 Product consistency
4.1 Quality control program
It shall be the responsibility of the manufacturer to implement a quality control program to ensure that
production continuously meets the requirements of this document.
4.2 Leak resistance testing
Every manufactured sprinkler shall pass a leak resistance test equivalent to a hydrostatic pressure of
at least twice the rated pressure for at least 2 s.
4.3 Glass bulb integrity test
Each glass bulb sprinkler assembly shall be evaluated for glass bulb cracking, breaking, or other damage
as indicated by the loss of fluid. The test shall be conducted after the leakage test.
The bubble in each glass bulb shall be examined at room ambient temperature. The sprinkler shall then
be heated in a circulating air oven or liquid bath to 5 °C below the minimum operating temperature
range of the sprinkler. The bubble shall then be examined to determine the bubble size has been reduced
in accordance with the glass bulb manufacturer's specifications. After cooling, the bubble size shall
again be examined to determine the bubble returned to the original size within the tolerance allowed
by the glass bulb manufacturer.
5 Product assembly
5.1 General
All sprinklers shall be designed and manufactured such that they cannot be readily adjusted, dismantled
or reassembled.
5.2 Dynamic O-ring seals
The closure of the waterway shall not be achieved by the use of a dynamic O-ring or similar seal. (An
O-ring or similar seal that moves during operation or is in contact with a component that moves during
operation.)
5.3 Rated pressure
Sprinklers shall have a rated pressure of 1,2 MPa (12 bar).
6 Requirements
6.1 Dimensions
6.1.1 Orifice size
All sprinklers shall be constructed so that a sphere of diameter 8 mm can pass through the water
passage in the sprinkler.
6.1.2 Nominal thread sizes
6.1.2.1 Sprinklers shall have a nominal thread size of R ¾.
6.1.2.2 Nominal thread sizes shall be suitable for fittings threaded in accordance with ISO 7-1. The
dimensions of all threaded connections should conform to International Standards where applied.
National standards may be used if International Standards are not applicable.
6.2 Temperature ratings and color codings
The marked nominal temperature rating and color coding of sprinkler shall be in accordance with
Table 1.
Table 1 — Nominal temperature rating and color coding
Glass bulb sprinklers Fusible element sprinklers
Marked nominal Marked nominal
Liquid color code Yoke arm color code
temperature rating (°C) temperature rating (°C)
68 to 74 red 68 to 74 uncolored
93 to 104 green 93 to 104 white
4 © ISO 2020 – All rights reserved

6.3 Operating temperature (see 7.3)
Sprinklers shall be verified to operate within a temperature range of
t=x ± (0,035x + 0,62) °C
where
t is the temperature range, rounded to the nearest 0,1 °C;
x is the marked nominal temperature rating (see Table 1).
6.4 Water flow constant (see 7.4)
The flow constant, K, for sprinklers is given by the formula:
q
K=
10p
where
p is the pressure, expressed in MPa;
q is the flow rate, expressed in litres per minute (l/min).
The flow constant for ESFR sprinklers shall have values of 202 ± 10 or 242 ± 12 when determined by the
test method of 7.4
6.5 Water distribution (see 7.5)
6.5.1 When tested in accordance with 7.5 the sprinkler shall meet the requirements of Tables 2 or 3, as
applicable.
Table 2 — Sprinkler water distribution measurement K202
a,b
Number Sprinkler Pipe Ceiling Pressure Minimum Minimum Minimum Minimum Minimum
of spacing spacing clearance  16-pan flue 20-pan non-flue single
sprinklers   to water- average space average 10-pan non-flue
c c
under the   collection density (4 pans) density average pan
MPa
c c,d c
water-  pans average density density
(bar)
collection
m m m mm/min mm/min mm/min mm/min mm/min
system
0,34
1 0 0 3,04 21,2 40,8 NR NR NR
(3,4)
0,34
1 0 0 4,42 19,6 36,3 NR NR NR
(3,4)
0,51
1 0 0 4,42 NR 69,4 37,1 20,4 10,6
(5,1)
0,34
2 3,04 0 1,27 24,5 NR NR NR NR
(3,4)
0,34
2 3,04 0 3,04 22,0 NR NR NR NR
(3,4)
0,34
2 0 3,04 1,27 23,7 NR NR NR NR
(3,4)
a
All 0,34 MPa (3,4 bar) tests are performed on a system fed from both directions (double feed).
b
All 0,51 MPa (5,1 bar) tests are performed on a system fed from one direction (single feed), except for the two-sprinklers, single-pipe tests which are
performed on a double-feed system.
c
NR = No requirement (see Figures 5 to 9).
d
Average of the ten non-flue pans with the lowest water collection.
Table 2 (continued)
a,b
Number Sprinkler Pipe Ceiling Pressure Minimum Minimum Minimum Minimum Minimum
of spacing spacing clearance  16-pan flue 20-pan non-flue single
sprinklers   to water- average space average 10-pan non-flue
c c
under the   collection density (4 pans) density average pan
MPa
c c,d c
water-  pans average density density
(bar)
collection
m m m mm/min mm/min mm/min mm/min mm/min
system
0,34
2 0 3,04 3,04 23,3 NR NR NR NR
(3,4)
0,34
2 3,66 0 1,27 18,0 NR NR NR NR
(3,4)
0,34
2 0 3,66 1,27 18,4 NR NR NR NR
(3,4)
0,51
2 3,04 0 1,27 NR NR 31,4 24,5 8,2
(5,1)
0,51
2 0 3,04 1,27 NR NR 31,4 24,5 8,2
(5,1)
0,34
4 3,04 3,04 1,27 27,7 NR NR NR NR
(3,4)
0,34
4 3,04 3,04 3,04 35,1 NR NR NR NR
(3,4)
0,34
4 2,44 3,6 1,27 26,9 NR NR NR NR
(3,4)
0,51
4 3,04 3,04 1,27 NR NR 29,0 24,5 15,1
(5,1)
a
All 0,34 MPa (3,4 bar) tests are performed on a system fed from both directions (double feed).
b
All 0,51 MPa (5,1 bar) tests are performed on a system fed from one direction (single feed), except for the two-sprinklers, single-pipe tests which are
performed on a double-feed system.
c
NR = No requirement (see Figures 5 to 9).
d
Average of the ten non-flue pans with the lowest water collection.
Table 3 — Sprinkler water distribution measurement K242
a,b
Number Sprinkler Pipe Ceiling Pressure Minimum Minimum Minimum Minimum Minimum
of spacing spacing clearance  16-pan flue 20-pan non-flue single
sprinklers   to water-  average space average 10-pan non-flue
c c
under the   collection density (4 pans) density average pan
c c,d c
water-  pans average density density
MPa
collection
m m m (bar) mm/min mm/min mm/min mm/min mm/min
system
0,24
1 0 0 3,04 21,2 40,8 NR NR NR
(2,4)
0,24
1 0 0 4,42 19,6 36,3 NR NR NR
(2,4)
0,36
1 0 0 4,42 NR 69,4 37,1 20,4 10,6
(3,6)
0,24
2 3,04 0 1,27 24,5 NR NR NR NR
(2,4)
0,24
2 3,04 0 3,04 22,0 NR NR NR NR
(2,4)
0,24
2 0 3,04 1,27 23,7 NR NR NR NR
(2,4)
a
All 0,24 MPa (2,4 bar) tests are performed on a system fed from both directions (double feed).
b
All 0,36 MPa (3,6 bar) tests are performed on a system fed from one direction (single feed), except for the two-sprinklers, single-pipe tests which are
performed on a double-feed system.
c
NR = No requirement (see Figures 5 to 9).
d
Average of the ten non-flue pans with the lowest water collection.
6 © ISO 2020 – All rights reserved

Table 3 (continued)
a,b
Number Sprinkler Pipe Ceiling Pressure Minimum Minimum Minimum Minimum Minimum
of spacing spacing clearance  16-pan flue 20-pan non-flue single
sprinklers   to water-  average space average 10-pan non-flue
c c
under the   collection density (4 pans) density average pan
c c,d c
water-  pans average density density
MPa
collection
m m m (bar) mm/min mm/min mm/min mm/min mm/min
system
0,24
2 0 3,04 3,04 23,3 NR NR NR NR
(2,4)
0,24
2 3,66 0 1,27 18,0 NR NR NR NR
(2,4)
0,24
2 0 3,66 1,27 18,4 NR NR NR NR
(2,4)
0,36
2 3,04 0 1,27 NR NR 31,4 24,5 8,2
(3,6)
0,36
2 0 3,04 1,27 NR NR 31,4 24,5 8,2
(3,6)
0,36
4 3,04 3,04 1,27 27,7 NR NR NR NR
(3,6)
0,24
4 3,04 3,04 3,04 35,1 NR NR NR NR
(2,4)
0,24
4 2,44 3,6 1,27 26,9 NR NR NR NR
(2,4)
0,36
4 3,04 3,04 1,27 NR NR 29,0 24,5 15,1
(3,6)
a
All 0,24 MPa (2,4 bar) tests are performed on a system fed from both directions (double feed).
b
All 0,36 MPa (3,6 bar) tests are performed on a system fed from one direction (single feed), except for the two-sprinklers, single-pipe tests which are
performed on a double-feed system.
c
NR = No requirement (see Figures 5 to 9).
d
Average of the ten non-flue pans with the lowest water collection.
6.6 Function (see 7.6)
6.6.1 Lodgement (see 7.6.1)
When tested in accordance with 7.6.1, the sprinkler shall open and, any lodgement of released parts
shall be cleared within 10 s of release of the heat-responsive element.
6.6.2 Deflector strength (see 7.6.2)
The deflector and its supporting parts shall not sustain significant damage as a result of the deflector
strength test specified in 7.6.2.
If minor damage is noted, testing in accordance with 6.5.1 can be done to demonstrate compliance.
NOTE In most instances, visual examination of the sprinkler will be sufficient to establish conformance
with 6.5.1.
6.7 Service load and strength of sprinkler body (see 7.7)
6.7.1 The sprinkler body shall comply with the requirements of 6.7.1.1 or 6.7.1.2.
6.7.1.1 The sprinkler body shall not show permanent elongation of more than 0,2 % between the
load-bearing points of the sprinkler body after being subjected to twice the service load as measured
according to 7.7.1 or 7.7.2.
6.7.1.2 The sprinkler body shall not show permanent elongation of more than 50 % of the sprinkler
body with the design load being applied after being subjected to twice the assembly load as measured
according to 7.7.3.
6.7.2 The manufacturer shall specify the average and upper limit of the service or assembly load. These
values shall not be exceeded when tested in accordance with 7.7.1, 7.7.2, or 7.7.3 as applicable.
6.8 Strength of heat-responsive element (see 7.8)
6.8.1 When tested in accordance with 7.8.1, glass bulb elements shall have a design strength lower
tolerance limit (LTL) on the strength distribution curve of at least twice the upper tolerance limit (UTL)
of the service load distribution curve, based on calculations with a degree of confidence (γ) of 0,99 for
99 % of samples (P), based on normal or Gaussian distribution except where other distribution can be
shown to be more applicable due to manufacturing or design factors (see Figure 2).
Key
1 average service load
2 service load curve
3 UTL
4 LTL
5 average design strength
6 design strength curve
Figure 2 — Strength curve
6.8.2 A fusible heat-responsive element in the ordinary temperature range shall be designed to
a) sustain a load of 15 times its design load corresponding to the maximum service load measured
according to 7.8 for a period of 100 h when tested in accordance with 7.8.2.1, or
8 © ISO 2020 – All rights reserved

b) demonstrate the ability to sustain the design load when tested in accordance with 7.8.2.2
(see Annex B).
6.9 Leak resistance and hydrostatic strength (see 7.9)
6.9.1 A sprinkler shall not show any sign of leakage when tested according to 7.9.1.
6.9.2 A sprinkler shall not rupture, operate, or release any parts when tested according to 7.9.2.
6.10 Heat exposure (see 7.10)
6.10.1 Glass bulb sprinklers (see 7.10.1)
There shall be no damage to the glass bulb element when the sprinkler is tested according to 7.10.1.
6.10.2 All sprinklers (see 7.10.2)
Sprinklers shall withstand exposure to increased ambient temperature without evidence of weakness
or failure when tested according to 7.10.2.
6.11 Thermal shock for glass bulb sprinklers (see 7.11)
Glass bulb sprinklers shall not be damaged when tested according to 7.11. Following the thermal
shock exposure, the sprinkler shall comply with 6.6.1 (Function) when tested with an inlet pressure of
0,035 MPa (0,35 bar).
6.12 Corrosion
6.12.1 Stress corrosion for copper-based alloy components (see 7.12.1)
When tested in accordance with 7.12.1, each sprinkler shall show no cracks, delamination, or failures
which can possibly affect its ability to function as intended.
6.12.2 Sulfur-dioxide/carbon-dioxide corrosion (see 7.12.2)
NOTE In some countries this test is not mandatory.
Sprinklers shall be resistant to sulfur dioxide/carbon dioxide saturated with water vapor when
conditioned in accordance with 7.12.2.
Following exposure, glass bulb sprinkler samples shall either be
a) tested at 0,035 MPa (0,35 bar) in accordance with 6.6.1, or
b) meet the requirements of 6.14 in orientation A.
Following exposure, half of the fusible element sprinkler samples shall be functionally tested
at 0,035 MPa (0,35 bar) only in accordance with 6.6.1 and the remaining samples shall meet the
requirements of 6.14 when tested in accordance with 7.14.1.2.
6.12.3 Hydrogen sulfide corrosion (see 7.12.3)
NOTE In some countries this test is not mandatory.
Sprinklers shall be resistant to hydrogen sulfide saturated with water vapor when conditioned in
accordance with 7.12.3.
Following exposure, glass bulb sprinkler samples shall either be
a) tested at 0,035 MPa (0,35 bar) in accordance with 6.6.1, or
b) meet the requirements of 6.14 in orientation A.
Following exposure, half of the fusible element sprinkler samples shall be functionally tested
at 0,035 MPa (0,35 bar) only in accordance with 6.6.1 and the remaining samples shall meet the
requirements of 6.14 when tested in accordance with 7.14.1.2.
6.12.4 Salt spray loading (see 7.12.4)
Sprinklers shall be resistant to salt spray when conditioned in accordance with 7.12.4.
Following exposure, glass bulb sprinkler samples shall either be
a) tested at 0,035 MPa (0,35 bar) in accordance with 6.6.1, or
b) meet the requirements of 6.14 in orientation A.
Following exposure, half of the fusible element sprinkler samples shall be functionally tested
at 0,035 MPa (0,35 bar) only in accordance with 6.6.1 and the remaining samples shall meet the
requirements of 6.14 when tested in accordance with 7.14.1.2.
6.12.5 Moist-air exposure (see 7.12.5)
Sprinklers shall be resistant to moist-air exposure when tested in accordance with 7.12.5. Following
exposure, the sprinklers shall be functionally tested at 0,05 MPa (0,5 bar) in accordance with 6.6.1.
6.13 Water hammer (see 7.13)
Sprinklers shall not leak during or after the pressure surges described in 7.13. After being subjected to
the test according to 7.13, they shall show no signs of mechanical damage, shall meet the requirement of
6.6.1 and shall operate when functionally tested to the requirements of 6.6.1 at a pressure of 0,035 MPa
(0,35 bar)
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