ISO 11601:2017
(Main)Fire fighting — Wheeled fire extinguishers — Performance and construction
Fire fighting — Wheeled fire extinguishers — Performance and construction
ISO 11601:2017 specifies the principal requirements intended to ensure the safety, reliability and performance of wheeled fire extinguishers.
Lutte contre l'incendie — Extincteurs sur roues — Performances et construction
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 11601
Third edition
2017-07
Fire fighting — Wheeled fire
extinguishers — Performance and
construction
Lutte contre l’incendie — Extincteurs sur roues — Performances et
construction
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types of wheeled fire extinguishers . 3
5 Extinguishing media, propellants and fill densities . 4
5.1 Extinguishing media . 4
5.1.1 Carbon dioxide . 4
5.1.2 Clean agents . 4
5.1.3 Powder . . 4
5.1.4 Foam concentrates . 4
5.2 Propellants . 4
5.3 Fill density. 4
5.4 Filling tolerance . 4
5.5 Charges . 5
5.5.1 Nominal charge . 5
5.5.2 Gross weight . 5
6 Performance . 5
6.1 Operating temperatures . 5
6.2 Effective discharge time and bulk range of discharge . 5
6.2.1 Effective discharge time . . . 5
6.2.2 Bulk range . 5
6.3 Resistance to temperature changes . 6
6.3.1 Requirements . 6
6.3.2 Test procedure . 6
6.4 Retention of charge . 7
6.4.1 Checking . 7
6.5 Intermittent discharge test . . 7
6.6 Resistance to corrosion . 7
6.6.1 External corrosion test . 7
6.6.2 Internal corrosion test for water and foam extinguishers . 8
6.7 Durability test . 8
6.8 Electrical conductivity of extinguisher discharge . 9
6.8.1 Requirement . 9
6.8.2 Procedure used to test for electrical conductivity . 9
7 Fire performance tests . 9
7.1 Suitability for the various classes of fire . 9
7.2 Class A fire tests .10
7.3 Class B fire tests .10
7.4 Class D fire tests .10
8 Construction requirements .10
8.1 General requirements .10
8.2 High-pressure cylinders .11
8.3 Low-pressure cylinders .11
8.3.1 General.11
8.4 Steel cylinders .11
8.4.1 Welded low-carbon steel .11
8.4.2 Stainless steel cylinders .12
8.5 Aluminium cylinders.12
8.6 Minimum wall thickness .12
8.7 Caps, valves and closures .12
8.8 Safety and anti-overfill devices .13
8.8.1 Safety devices .13
8.8.2 Anti-overfill devices .13
8.9 Manufacturing tests .13
8.9.1 Low-pressure cylinders .13
8.9.2 Leakage tests .13
8.10 Requirements for plastic components .14
8.10.1 General requirements .14
8.10.2 Requirements for normally pressurized components .14
8.10.3 Ultraviolet light exposure .14
8.10.4 Normally non-pressurized components .15
8.10.5 Exposure to extinguishing agent test .15
8.11 Discharge assembly .15
8.12 Control valve .16
8.13 Horn for carbon dioxide extinguisher .16
8.14 Method of operation .17
8.15 Safety locking devices .17
8.16 Pressure gauges for low-pressure extinguishers .17
8.16.1 General.17
8.16.2 Pressure gauge calibration test .18
8.16.3 Pressure gauge burst strength test .18
8.16.4 Pressure gauge overpressure test .19
8.16.5 Pressure gauge impulse test .19
8.16.6 Pressure gauge relief test .19
8.16.7 Pressure gauge water resistance test .19
8.16.8 Pressure gauge leakage test .19
8.16.9 Pressure gauge plastics components .20
8.17 Siphon tubes and filters for water-based extinguishers .20
8.18 Carriage assembly .20
8.18.1 Carriage . .20
8.18.2 Mobility .20
8.18.3 Hose retaining unit .20
8.19 Gasket and O-rings .21
8.19.1 Tensile strength, elongation, maximum set and hardness.21
8.19.2 Compression set .21
9 Colour and marking.21
9.1 Colour .21
9.2 Marking .21
9.3 Operating instructions .22
9.4 Warning markings .23
9.5 Use-code symbols .23
9.6 Recharging instructions .23
9.7 Inspection instructions .24
10 Manuals .24
10.1 User manual .24
10.2 Service manual .25
Annex A (normative) Clean agent FK-5-1-12 — Extinguishing agent physical properties .26
Annex B (normative) Clean agent HCFC Blend B — Extinguishing agent physical properties .29
Annex C (normative) Clean agent HFC-227ea — Extinguishing agent physical properties.32
Annex D (normative) Clean agent HFC-236fa — Extinguishing agent physical properties .35
Bibliography .38
iv © ISO 2017 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 2, Manually transportable fire extinguishers.
This third edition cancels and replaces the second edition (ISO 11601:2008), which has been technically
revised.
The main changes compared to the previous editions are as follows:
— new requirements for four clean agents have been added;
— marking requirements for water-based extinguishers found suitable for use on polar solvents has
been added.
INTERNATIONAL STANDARD ISO 11601:2017(E)
Fire fighting — Wheeled fire extinguishers — Performance
and construction
1 Scope
This document specifies the principal requirements intended to ensure the safety, reliability and
performance of wheeled fire extinguishers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 5923, Equipment for fire protection and fire fighting — Fire extinguishing media — Carbon dioxide
ISO 7165:2017, Fire fighting — Portable fire extinguishers — Performance and construction
ISO 7202, Fire protection — Fire extinguishing media — Powder
ISO 7203-1, Fire extinguishing media — Foam concentrates — Part 1: Specification for low-expansion foam
concentrates for top application to water-immiscible liquids
ISO 7203-2, Fire extinguishing media — Foam concentrates — Part 2: Specification for medium- and high-
expansion foam concentrates for top application to water-immiscible liquids
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 http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
batch
group of the same products made on the same production line using the same lot of materials during
one production shift
3.2
body
metal shell of an extinguisher designed to contain the extinguishing media including any skirt
3.3
bulk range
range of the extinguisher when 50 % of its media has been expelled
3.4
burst pressure
P
b
pressure at which the extinguisher cylinder ruptures
3.5
charge of extinguisher
mass or volume of extinguishing medium contained in the extinguisher expressed in volume (litres) for
water-based extinguishers and in mass (kilograms) for other extinguishers
3.6
classification of fires
Class A fires involving solid materials, usually of an organic nature, in which combustion normally
takes place with the formation of glowing embers
Class B fires involving liquids or liquefiable solids
Class C fires involving gases
Class D fires involving metals
Class F fires involving cooking media (vegetable or animal oils and fats) in cooking appliances
Note 1 to entry: Class definitions are in accordance with ISO 3941.
3.7
clean agent
electrically non-conducting gaseous or vapourizing liquid fire extinguishant that does not leave residue
upon evaporation
Note 1 to entry: For conductive properties and amount of residue, see Annexes A, B, C and D.
3.8
closure
component, other than a safety device or pressure indicator, subject to internal pressure and used to
close off and seal the body
3.9
complete discharge
point in the discharge of an extinguisher when the internal pressure has equalized with the external
pressure with the control valve being kept fully open
3.10
effective discharge time
time from the commencement of discharge of the extinguishing medium at the nozzle to the gas point of
the discharge stream with the control valve fully open
3.11
extinguisher
appliance containing an extinguishing medium which may be discharged and directed onto a fire by the
action of internal pressure
Note 1 to entry: Discharge may be achieved by
a) stored pressure (constant pressurization of the extinguishing media container), or
b) cartridge or cylinder operated device (pressurization at the time of use by the release of a pressurizing gas
stored in a separate high-pressure cartridge or container).
3.12
extinguishing medium
substance contained in the extinguisher which causes extinguishment
3.13
fill density
mass in kilograms of extinguishing medium per litre of container volume as fitted for use, complete
with valve and internal fittings
2 © ISO 2017 – All rights reserved
3.14
gas point
point where the medium discharge changes from predominately medium to predominately expellant gas
3.15
lowest observable adverse effect level
LOAEL
lowest concentration at which an adverse physiological or toxicological effect has been observed
3.16
maximum service pressure
P
ms
equilibrium pressure developed in a normally charged and pressurized extinguisher which is
conditioned at 60 °C for at least 18 h
3.17
propellant
non-flammable compressed gas used to expel the extinguishing medium
3.18
rechargeable extinguisher
extinguisher designed and intended to be recharged after use
3.19
service pressure
P
s
equilibrium pressure developed in a normally charged and pressurized extinguisher conditioned at
20 °C for at least 18 h
3.20
test pressure
P
t
the higher of 1,43 × P , 2,5 × P or 2,0 MPa
ms s
3.21
wheeled fire extinguisher
appliance on wheels having a total mass more than 20 kg but not greater than 450 kg, which is designed
to be operated and transported to the fire by one person
4 Types of wheeled fire extinguishers
4.1 Wheeled fire extinguishers are described by the type of extinguishing medium which they contain.
At present, the types of wheeled fire extinguishers are
— water-based,
— powder,
— carbon dioxide, and
— clean agent.
NOTE In some countries, the manufacture and use of clean agents is regulated by the Montreal Protocol or
by national regulations.
4.2 Water-based wheeled fire extinguishers may contain plain water or water with additives such as
wetting agents, viscosity-increasing agents or flame-retardant, or foaming agents.
NOTE Currently there are no International Standards covering additives added to water to produce
antifreeze, wetting or other special characteristics.
4.3 Powders may be of the “BC” or “ABC” types, or may be specially prepared for Class D fires.
4.4 Wheeled fire extinguishers may have two extinguisher bodies per axle. Each extinguisher body
may contain the same or a different extinguishing medium provided they are compatible with each other.
5 Extinguishing media, propellants and fill densities
5.1 Extinguishing media
5.1.1 Carbon dioxide
Carbon dioxide used in wheeled fire extinguishers shall comply with ISO 5923.
5.1.2 Clean agents
Clean agents used in wheeled fire extinguishers shall comply with Annex A for FK-5-1-12, Annex B for
HCFC Blend B, Annex C for HFC-227ea or Annex D for HFC 236fa as appropriate or shall be regulated by
the national environmental regulatory body of a country.
NOTE In some countries, the manufacture and use of clean agents is regulated by the Montreal Protocol or
by national regulations.
5.1.3 Powder
Powder used in wheeled fire extinguishers shall comply with ISO 7202.
IMPORTANT — Exception: powders for use on Class D fires.
5.1.4 Foam concentrates
Foam concentrates used in wheeled fire extinguishers shall comply with ISO 7203-1 (alternatively,
ISO 7203-2).
5.2 Propellants
The propellant for stored pressure and cartridge-operated wheeled fire extinguishers shall be air, argon,
carbon dioxide, helium, nitrogen or mixtures of these gases having a maximum dewpoint of −60 °C.
IMPORTANT — Exception: propellant for stored pressure water-based wheeled fire extinguishers
need not meet the dewpoint requirement.
5.3 Fill density
The fill density for carbon dioxide wheeled fire extinguishers shall not exceed 0,75 kg/l.
The fill density for clean agent wheeled fire extinguishers shall not exceed the values given in Annex A,
Annex B, Annex C or Annex D, as appropriate.
These fill densities may be modified subject to national pressure vessel regulations.
5.4 Filling tolerance
The actual charge of a wheeled fire extinguisher shall be the nominal charge within the following limits:
a) water-based extinguishers: +0, −5 % by volume;
b) powder-based extinguishers: ±2 % by mass;
4 © ISO 2017 – All rights reserved
c) carbon dioxide and clean agent extinguishers: +0, −5 % by mass.
5.5 Charges
5.5.1 Nominal charge
The following are the recommended charges for wheeled fire extinguishers:
a) water-based extinguishers: 20 l, 45 l, 60 l and 125 l;
b) powder-based extinguishers: 20 kg, 50 kg, 100 kg and 150 kg;
c) carbon dioxide and clean agent extinguishers: 10 kg, 20 kg, 30 kg, 50 kg and 70 kg
NOTE Other nominal capacities are allowed.
5.5.2 Gross weight
The gross weight of a wheeled fire extinguisher shall not exceed 450 kg.
6 Performance
6.1 Operating temperatures
Wheeled fire extinguishers shall be capable of operating reliably within one of the following
temperature ranges:
a) +5 °C to +60 °C;
b) −5 °C to +60 °C;
c) −10 °C to +60 °C;
d) −20 °C to +60 °C;
e) −30 °C to +60 °C;
f) −40 °C to +60 °C;
g) −55 °C to +60 °C.
The temperature range selected from the above ranges shall be marked on the extinguisher (see 9.2.5).
6.2 Effective discharge time and bulk range of discharge
6.2.1 Effective discharge time
6.2.1.1 The effective discharge time of water-based type wheeled fire extinguishers shall be not less
than 40 s or more than 210 s.
6.2.1.2 The effective discharge time of wheeled fire extinguishers other than water-based types shall
be not less than 20 s.
6.2.2 Bulk range
6.2.2.1 The bulk range of wheeled fire extinguishers with a Class A rating shall be not less than 6 m
when tested in accordance with 6.2.2.2.
IMPORTANT — Exception: for water-based type wheeled fire extinguishers fitted with a spray
nozzle, the bulk range maybe reduced to 3 m.
6.2.2.2 Condition the extinguisher for not less than 18 h at a temperature of (20 ± 3) °C and place it in
its normal operating position with the discharge nozzle held horizontally at a height of 1 m.
Fully discharge the extinguisher with the control valve fully open within 5 min of conditioning.
Record the bulk range at the time corresponding to 50 % of the effective discharge time.
If the range of effective discharge is difficult to determine visually, supplementary means, such as
collection boxes for water, foam or powder extinguishers or condensing plates for carbon dioxide and
clean agent extinguishers may be used.
6.3 Resistance to temperature changes
6.3.1 Requirements
Wheeled fire extinguishers shall be able to operate at temperatures between the minimum marked on
the extinguisher (see 6.1) and +60 °C. After the test described in 6.3.2, they shall satisfy the following
requirements:
a) the extinguisher shall operate as intended;
b) the extinguisher shall commence discharge within 5 s of the control valve being opened;
c) not more than 10 % of the initial charge of media shall remain within the extinguisher after
complete discharge.
6.3.2 Test procedure
Subject four extinguishers to the temperature cycles defined in Table 1, two extinguishers to each cycle.
Table 1 — Temperature cycles
a
Duration Cycle No. 1 Cycle No. 2
h
a
24 ± 1 Store at minimum storage and use tem- Store at (60 ± 2) °C
perature
(+0, −2) °C
24 ± 1 Store at (20 ± 5) °C Store at (20 ± 5) °C
24 ± 1 Store at (60 ± 2) °C Store at minimum storage and use tem-
perature
(+0, −2) °C
a
The storage temperatures refer to the ambient temperature within the conditioning chamber.
Operate the extinguisher with the control valve fully open within 5 min of its removal from the
conditioning chamber.
If it is not possible to operate the extinguisher within 5 min after its removal from the conditioning
chamber, suitable means, such as insulation shall be used to maintain the extinguisher at the
conditioning temperature until discharge.
6 © ISO 2017 – All rights reserved
6.4 Retention of charge
6.4.1 Checking
6.4.1.1 Wheeled fire extinguishers and gas cartridges or cylinders shall be designed so as to permit
their charge to be checked at regular intervals when they are installed.
6.4.1.2 The charge of the following types of wheeled fire extinguishers shall be measured by weighing:
a) all types of gas cartridges for wheeled fire extinguishers;
b) carbon dioxide wheeled fire extinguishers;
c) stored pressure wheeled fire extinguishers of various types including some clean agents in which
a loss of 1 % of total charged extinguisher mass is accompanied by a pressure loss of not more than
10 % of the service pressure at (20 ± 2) °C.
6.4.1.3 The charge of stored pressure wheeled fire extinguishers of types not covered by 6.4.1.2 b) and
6.4.1.2 c) and non-liquefied gas containers fitted with a gauge shall be checked by direct measurement of
internal pressure at (20 ± 2) °C. For this purpose, the extinguisher shall be fitted with a pressure gauge
ported into the extinguisher body.
NOTE If a connection is provided to which an independent pressure measuring appliance can be attached for
checking the pressure gauge, the connection is equipped with a pressure retaining cap.
6.5 Intermittent discharge test
6.5.1 A wheeled fire extinguisher conditioned at (20 ± 5) °C and at (60 ± 2) °C shall operate in such a
manner that not more than 1 s elapses from the time the control valve is operated until the extinguishing
medium starts to discharge and shall cease the discharge of medium within 1 s after closing the control
valve. Not more than 10 % of the initial charge remains within the extinguisher after complete discharge.
6.5.2 The test shall be conducted following conditioning at each of the temperatures specified in 6.5.1
for at least 18 h. The extinguisher shall be operated intermittently by opening and closing the control
valve in cycles of 5 s open and 5 s closed until the end of discharge.
6.6 Resistance to corrosion
6.6.1 External corrosion test
Wheeled fire extinguishers shall be subjected to a salt spray test as defined in ISO 9227 for a period
of 480 h and then shall be washed carefully to remove any salt deposits. Two samples shall be tested,
either two of the same size or one sample each of two different sizes from the same family.
The operating forces, or energy if applicable, shall comply with the method of operation specified in 8.14.
The pressure gauge on stored pressure extinguishers shall remain watertight and functional. See 8.16.7.
There shall be no corrosion of the metal of the extinguisher likely to impair its operation or safety.
Discolouration or superficial corrosion of non-ferrous materials is acceptable but galvanic corrosion
between dissimilar metals is not permitted.
Test samples employing smaller extinguisher bodies are permitted to be used for this test provided
they are fabricated using the same material and processes and have the same protective coatings or
corrosion protection system.
The length of the discharge hose assembly is permitted to be reduced to 1,4 m for this test.
6.6.2 Internal corrosion test for water and foam extinguishers
Wheeled fire extinguishers, charged in accordance with the manufacturer’s instructions, shall be
subjected eight times to the temperature cycle defined in Table 2.
Table 2 — Temperature cycles
Stage Duration Conditioning chamber tempera-
h ture
°C
1 (24 ± 1) a
2 (>24) (20 ± 5)
3 (24 ± 1) (60 ± 5)
4 (>24) (20 ± 5)
a
Lowest temperature marked on extinguisher, (±5) °C. See 6.1.
Test samples employing smaller extinguisher bodies are permitted to be used for this test provided
they are fabricated using the same material and processes and have the same protective coatings or
corrosion protection system.
A liquid bath shall not be used.
The duration of any one complete cycle shall not exceed 120 h.
On completion of the eight temperature cycles, the body shall be cut into two sections in a manner
sufficient to permit internal examination. Detachment of any protective coating local to the plane of
section shall be disregarded. There shall be no visible signs of corrosion of the metal or detachment,
cracking, or bubbling of any protective coating. There shall be no visible change in the colour of the
extinguishing media other than that resulting from the thermal cycling.
In order to establish reference samples for a change of colour that occurs naturally due to the
temperature changes, two samples of the extinguishing medium shall be stored in closed glass
containers and subjected to the same cycles as the extinguishers.
6.7 Durability test
6.7.1 After being subjected to the series of tests described in 6.7.2 through 6.7.4, a fully charged
wheeled fire extinguisher shall comply with the following:
— not less than 85 % (by weight) of the rated capacity of the extinguishing medium shall be discharged
as intended;
— the wheels, axles and carriage assembly shall not be damaged to the extent of impairing mobility by
one person;
— no weld shall be broken;
— the dip tube shall not become dislodged.
6.7.2 Durability shall be evaluated by:
— being pushed or pulled for 8 km at the rate of 8 km/h to 13 km/h over a rough surface;
NOTE A surface of crushed stone, nominal size of 18 mm or equivalent, is considered a rough surface.
— being dropped three times onto a concrete surface from a 300 mm high platform so as to land on
the wheels;
8 © ISO 2017 – All rights reserved
— being pulled at a speed of 8 km/h and allowing one wheel to strike a vertical wall of concrete, steel
or brick;
— being pushed over so as to land on the bumper or towing handle.
6.7.3 Drop the nozzle of a wheeled extinguisher, as attached to the hose, three times onto a concrete
surface from a height of 900 mm. The assembly is to be dropped in a random manner so that no effort is
made to cause any part of the nozzle, such as the tip or handle, to initially strike the concrete surface.
6.7.4 A wheeled fire extinguisher, when placed in its intended storage position on a flat concrete
surface, shall be self-supporting, stable, able to return to the storage position when displaced from its
vertical position by 10° and operable.
6.8 Electrical conductivity of extinguisher discharge
6.8.1 Requirement
Water-based wheeled fire extinguishers that are marked as being suitable for use on fires involving
energized electrical equipment shall not pass a current of more than 0,5 mA when tested as described
in 6.8.2.
6.8.2 Procedure used to test for electrical conductivity
Hang a metal plate, of dimensions (1 m × 1 m) ± 25 mm, vertically from insulating supports. Connect
the plate to a transformer so that an alternating voltage of (36 ± 3,6) kV is established between the
plate and earth. The impedance of the circuit should be such that when a voltage equal to 10 % of the
normal primary voltage is applied to the primary and the secondary is short circuited, the current in
the secondary is not less than 0,1 mA.
Mount the extinguisher on an insulating support with the nozzle fixed 1 m from the centre of the
plate at right angles to it and directed towards it. Connect the extinguisher to earth. In the case of an
extinguisher with a hose, connect it to earth by connection at the nozzle or in the case of an extinguisher
not fitted with a hose, by connection at the handle.
Measure any current flowing between the extinguisher and earth when the plate is live and the
extinguisher discharging.
7 Fire performance tests
7.1 Suitability for the various classes of fire
7.1.1 Class A. The rating of wheeled fire extinguishers recommended as suitable for Class A fires shall
be determined using the method of 7.2. The rating shall be that of the maximum fire size extinguished
under the conditions of the test.
7.1.2 Class B. The rating of extinguishers recommended as suitable for Class B fires shall be
determined using the method of 7.3. The rating shall be that of the maximum fire size extinguished under
the conditions of the test.
7.1.3 Class C. There are no test requirements for the performance of extinguishers against Class C
fires included in this document. Suitability for use against Class C fires may be claimed for Class AB or B
powder-based extinguishers only.
7.1.4 Class D. Wheeled extinguishers recommended as suitable for Class D fires shall comply with 7.4.
NOTE Extinguishers suitable for Class D fires are not usually suitable for use on fires of other classes.
Specialized media and applicators are typically used.
7.2 Class A fire tests
Wheeled fire extinguisher intended for use on Class A fires shall be tested for a Class A fire rating using
the Class A rating system specified in ISO 7165.
7.3 Class B fire tests
Wheeled fire extinguishers intended for use on Class B fires shall be tested for a Class B fire rating
using the Class B rating system specified in ISO 7165.
Class B fire tests to determine suitability for polar solvent capability are specified in ISO 7165:2017,
Annex B.
7.4 Class D fire tests
The extinguishment of fires should be carried out using a portable extinguisher in accordance with
ISO 7165.
There are no numerical components for Class D ratings. The type of combustible metal for which
the extinguisher is applicable and the area, depth and other characteristics of the fire which may be
controlled and extinguished are to be summarized on the extinguisher nameplate and described in the
manufacturer’s installation instructions.
Since wheeled fire extinguishers have a greater charge, they may be classified for use on a proportionally
larger quantity and/or surface area of Class D combustible metals without repeating the Class D fire tests.
8 Construction requirements
8.1 General requirements
8.1.1 The following tests to determine P shall be carried out on a minimum of three extinguisher
ms
bodi
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