SIST EN 13565-1:2019+A1:2025

SLOVENSKI STANDARD
01-september-2025
Vgrajeni gasilni sistemi - Sistemi za gašenje s peno - 1. del: Zahteve in preskusne
metode za sestavne dele
Fixed firefighting systems - Foam systems - Part 1: Requirements and test methods for
components
Ortsfeste Brandbekämpfungsanlagen - Schaumlöschanlagen - Teil 1: Anforderungen
und Prüfverfahren für Bauteile
Installations fixes de lutte contre l'incendie - Systèmes à émulseurs - Partie 1 :
Exigences et méthodes d'essais relatives aux composants
Ta slovenski standard je istoveten z: EN 13565-1:2019+A1:2025
ICS:
13.220.10 Gašenje požara Fire-fighting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 13565-1:2019+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 13.220.20 Supersedes EN 13565-1:2019
English Version
Fixed firefighting systems - Foam systems - Part 1:
Requirements and test methods for components
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Brandbekämpfungsanlagen -
à émulseurs - Partie 1 : Exigences et méthodes d'essais Schaumlöschanlagen - Teil 1: Anforderungen und
relatives aux composants Prüfverfahren für Bauteile
This European Standard was approved by CEN on 8 February 2019 and includes Amendment 1 approved by CEN on 28 April
2025.
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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13565-1:2019+A1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 6
1 Scope. 8
2 Normative references . 8
3 Terms and definitions . 9
4 General construction requirements . 12
4.1 Connections . 12
4.1.1 Permanent connections and joints . 12
4.1.2 Bolting of pressure retaining parts . 12
4.2 Parts intended for removal during routine field maintenance . 12
4.2.1 Removal . 12
4.2.2 Re-assembly . 12
4.3 Hydrostatic strength . 12
4.3.1 Leak test . 12
4.3.2 Mechanical strength . 13
4.4 Castings . 13
4.5 Corrosion resistance of metal parts . 13
4.5.1 Salt spray corrosion resistance of metal parts . 13
4.5.2 Copper alloy components stress corrosion test . 13
4.5.3 Internal corrosion . 14
4.6 Elastomers . 14
4.7 Plastics and reinforced resin materials . 14
4.7.1 General . 14
4.7.2 Resistance to ageing . 14
4.7.3 Resistance to exposure to liquids . 14
4.8 Heat and fire resistance . 15
4.8.1 Sprayers and nozzles . 15
4.8.2 Foam generators . 15
4.9 Components for low expansion foam systems . 15
4.9.1 Foam branchpipes . 15
4.9.2 Foam sprayers . 15
4.9.3 Foam pourers and foam chambers . 15
4.9.4 Vapour seals . 16
4.9.5 Low back pressure and high back pressure foam generators . 16
4.9.6 Semi-subsurface hose units . 16
4.10 Components for medium and high expansion foam systems . 16
4.10.1 Nozzles and sprayers . 16
4.10.2 High expansion foam generators . 16
4.11 Tanks and pressure vessels for foam concentrates or solutions. 17
4.11.1 General . 17
4.11.2 Tanks at atmospheric pressure . 17
4.11.3 Pressure vessels. 17
5 Performance Characteristics of Foam Components . 17
5.1 Discharge coefficients and characteristics of branchpipes, sprayers and low and
high back pressure foam generators . 17
5.1.1 Single orifice components . 17
5.1.2 Multiple orifice components . 18
5.2 Quality of foam from aspirating components . 18
5.2.1 Low and medium expansion components . 18
5.2.2 High expansion components . 18
5.3 Accuracy of proportioning components . 18
6 Documentation . 18
6.1 Preparation and maintenance . 18
6.2 Installation and user documentation . 19
6.3 Design documentation . 19
7 Marking . 19
8 Evaluation of conformity - Initial type testing . 19
8.1 Conformity . 19
8.2 Modification . 20
8.3 Prior testing . 20
8.4 Grouping . 20
8.5 Related components . 20
8.6 Normal production . 20
8.7 Reference samples . 20
8.8 Test sequence . 20
Annex A (normative) Hydrostatic test . 22
A.1 General . 22
A.2 Leak test . 22
A.3 Mechanical strength . 22
Annex B (normative) Ageing test for plastics, thermoplastics or thermosets; and
reinforced resin materials . 23
B.1 General . 23
B.2 Tensile strength and elongation test . 23
B.3 Impact test . 23
Annex C (normative) Liquid exposure test . 24
Annex D (normative) Heat and fire resistance test for foam generators . 25
Annex E (normative) Flow tests . 26
E.1 General . 26
E.2 Discharge coefficient . 26
E.3 Discharge characteristic . 26
Annex F (normative) Quality of foam from aspirating components . 27
F.1 General . 27
F.2 Low expansion foams . 27
F.3 Medium expansion foams . 27
Annex G (normative) High expansion foam generator test . 28
Annex H (normative) Range tests for branchpipes . 29
Annex I (normative) Area coverage test for foam sprayers and nozzles . 30
Annex J (normative) Maximum flow and back pressure. 32
J.1 General . 32
J.2 Flow . 32
J.3 Back pressure . 32
J.4 Vapour seals . 32
J.4.1 Vapour seal – upstream (foam inlet side) . 32
J.4.2 Vapour seal – downstream (tank side) . 32
Annex K (normative) Insertion and deployment of semi-subsurface hose . 34
Annex L (normative) Salt spray corrosion test . 35
Annex M (normative) Stress corrosion test . 36
Annex N (normative) Internal corrosion test . 37

European foreword
This document (EN 13565-1:2019+A1:2025) 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 December 2025, and conflicting national
standards shall be withdrawn at the latest by December 2025.
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 supersedes !EN 13565-1:2019".
The start and finish of text introduced or altered by amendment is indicated in the text by tags
!".
Compared to the previous edition, the following changes have been made:
1) the foreword has been updated;
2) normative references have been updated;
3) 4.1 revised;
4) 4.4 revised;
5) 4.5 revised;
6) 4.6 revised;
7) 4.9 replaces Clause 8;
8) 4.10 replaces Clause 9;
9) 4.11 replaces Clause 10;
10) Clause 5 changed to ‘performance characteristics of foam components’;
11) Clause 6, new clause ‘documentation’;
12) Clause 7 replaces Clause 11;
13) Clause 8 replaces Clause 12;
14) Annex A revised;
15) Annex E requirements clause reference added;
16) Annex F requirements clause reference added.
17) Annex G revised;
18) Annex H revised;
19) Annex I revised;
20) Annex J revised;
21) Annexes K, L, M, N added.
EN 13565, Fixed firefighting systems — Foam systems, is currently composed with the following
parts:
— Part 1: Requirements and test methods for components;
— Part 2: Design, construction and maintenance.
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, Türkiye and the United Kingdom.

1 Scope
The requirements of this document set out the materials, construction, and performance of
components intended for use in fixed foam fire fighting systems, and using foam concentrates
conforming to EN 1568-1 to EN 1568-4. The components covered are: proportioners, sprayers,
semi-subsurface hose units, branchpipes, low/medium expansion foam generators, high
expansion foam generators, foam chambers, tanks and pressure vessels. Methods of test are
given in Annex A to Annex K.
Requirements are also given for the provision of the characteristic data needed for correct
application of components.
NOTE 1 Unless otherwise stated pressures are gauge pressures expressed in bar.
The requirements of this document do not cover, except where stated, the use of combinations
of components to form part, or the whole, of a fire fighting system.
NOTE 2 Components conforming to this document are not necessarily compatible one with another.
Requirements for pumps, motors and the functioning of mechanical components (i.e. remote
control turrets) are outside the scope of this document.
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.
EN 1568-1:2018, Fire extinguishing media — Foam concentrates — Part 1: Specification for
medium expansion foam concentrates for surface application to water-immiscible liquids
EN 1568-2:2018, Fire extinguishing media — Foam concentrates — Part 2: Specification for high
expansion foam concentrates for surface application to water-immiscible liquids
EN 1568-3:2018, Fire extinguishing media — Foam concentrates — Part 3 Specification for low
expansion foam concentrates for surface application to water-immiscible liquids
EN 1568-4:2018, Fire extinguishing media — Foam concentrates — Part 4: Specification for low
expansion foam concentrates for surface application to water-miscible liquids
EN 12259-1:1999+A1:2001, Fixed fire fighting systems — Components for sprinkler and water
spray systems — Part 1: Sprinklers
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories,
PN designated — Part 1: Steel flanges
EN 12542, LPG equipment and accessories — Static welded steel cylindrical tanks, serially
produced for the storage of Liquefied Petroleum Gas (LPG) having a volume not greater than 13
— Design and manufacture
m
!EN 13445 (all parts), Unfired pressure vessels"
EN ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols, designations and dimensions
(ISO 225)
EN ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid
chemicals (ISO 175)
EN ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented
impact test (ISO 179-1)
EN ISO 180, Plastics — Determination of Izod impact strength (ISO 180)
EN ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles (ISO
527-1)
EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1:
Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread (ISO
898-1)
EN ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2:
Nuts with specified property classes — Coarse thread and fine pitch thread (ISO 898-2)
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 888, Fasteners — Bolts, screws and studs — Nominal lengths and thread lengths
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines —
Specification for materials
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
Nordtest method NT Fire 042 Foam Concentrate Proportioner Performance Test
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
3.1
component
item or piece of equipment intended for use in a fixed foam fire extinguishing system
3.2
aspirating component
component within which air and foam solution are mixed to make foam
3.3
non-aspirating component
components which discharge a spray of foam solution so that mixing with air and formation of
foam takes place outside the component
3.4
proportioning component
component which controls the mixing of foam concentrate into a water flow, at a predetermined
ratio, to produce a foam solution
Note 1 to entry: Proportioning components are variously described as inline, bypass and round the pump
inductors, injectors, eductors, proportioners, venturis, constant and variable flow valves, orifice plates,
water powered foam pumps and displacement proportioners.
3.5
single orifice component
component in which liquid flows through a single flow controlling orifice
3.6
multiple orifice component
component in which liquid flows simultaneously through more than one flow controlling orifice
3.7
branchpipe
component which projects foam in the form of a jet or spray
3.8
foam chamber
component that incorporates a vapour seal, a foam expansion chamber, and which delivers
foam into a flammable or combustible liquid storage tank
Note 1 to entry: A foam generator can be connected to the foam chamber inlet.
3.9
foam generator
component which introduces air into the foam solution stream for delivery against a low back
pressure, i.e. discharging against atmospheric pressure
3.10
high back pressure foam generator
component which introduces air into the foam solution stream for delivery against a high back
pressure, for example, as is found in tank sub-surface injection
3.11
monitor
component consisting of a branchpipe or jet/fog nozzle and turret
Note 1 to entry: This standard is considering the mechanical properties and foam discharge performance
only. Different types of operation (electrically, hydraulically, water motor oscillating) are not subject of
this standard.
3.12
foam pourer (foam discharge outlet)
component which discharges foam gently and indirectly onto the fuel surface
Note 1 to entry: Some pourers are designed to discharge the foam tangentially in order to create a
circular motion, and thus promote foam distribution.
3.13
semi-subsurface hose unit
component which delivers foam below the surface of a flammable liquid so that it rises to the
liquid surface within a flexible hose and spreads over the liquid surface
3.14
turret
device on which a foam branchpipe is mounted to allow rotation and elevation
Note 1 to entry: The requirements for the testing of turrets are outside the scope of this standard.
3.15
vapour seal
frangible component designed to prevent tank contents vapours entering the foam pipework
system while allowing foam to flow into the tank during system operation
3.16
sprayer
open nozzle which discharges a spray of foam or foam solution
Note 1 to entry: The terms sprayer and nozzle are regarded as interchangeable.
3.17
low expansion foam
foam which has an expansion ratio not greater than 20
[SOURCE: EN 1568-4:2018, 3.3]
3.18
medium expansion foam
foam which has an expansion ratio greater than 20 but not greater than 200
[SOURCE: EN 1568-4:2018, 3.4]
3.19
high expansion foam
foam which has an expansion ratio greater than 200
[SOURCE: EN 1568-4:2018, 3.5]
3.20
working pressure
pressure at which the component is used in the system
3.21
discharge characteristic
pressure vs. flow relationship for components
3.22
discharge coefficient (K factor)
where Q is the flow rate through the component in l/min
K factor for the formula Q = K dP
and dP is the inlet pressure in bar
3.23
expansion ratio
ratio of the volume of foam to the volume of foam solution from which it is made
4 General construction requirements
4.1 Connections
4.1.1 Permanent connections and joints
Permanent joints on components for connection to pipework or other components shall
conform to ISO 7-1, or EN 1092-1. Other technical specifications valid in the place of use of the
component may be acceptable.
4.1.2 Bolting of pressure retaining parts
Bolts, nuts and/or studs used to fasten pressure retaining parts shall conform to EN ISO 898-1
and EN ISO 898-2.
The calculated load on any bolt or stud excluding the force required to compress the gasket
shall not exceed the minimum tensile strength specified in EN 225, ISO 888 or EN ISO 898-1
when the component is pressurized to four times the rated working pressure.
The area of the application of pressure shall be calculated using the following assumptions:
— If a full-face gasket is used, the assumed area of pressure application extends out to the
centre line of the bolts.
— If an 'O' ring seal or ring gasket is used, the assumed area of pressure application extends
out to the centre of the 'O' ring or gasket.
4.2 Parts intended for removal during routine field maintenance
4.2.1 Removal
Parts intended for removal during routine field maintenance shall be accessible, removable, and
replaceable without damage using appropriate tools normally used by the trade, or special tools
recommended by the component manufacturer.
4.2.2 Re-assembly
The design and construction of any part intended for removal during routine field maintenance
shall be such that it cannot be re-assembled so as to cause malfunction of the component,
without an external visible indication.
4.3 Hydrostatic strength
4.3.1 Leak test
The pressure retaining parts of components (including the connection joints), except
atmospheric storage tanks and pressure vessels, shall withstand for 10 min without leakage an
internal hydrostatic pressure of 1,5 times the working pressure specified by the manufacturer
+1
bar, when tested in accordance with Annex A.
4.3.2 Mechanical strength
The component housing shall withstand for 10 min without rupture a pressure of three times
+1
the design working pressure bar without rupture when tested in accordance with Annex A.
4.4 Castings
Castings shall not be plugged or filled.
Castings should be free from adhering sand and scale.
4.5 Corrosion resistance of metal parts
4.5.1 Salt spray corrosion resistance of metal parts
All mechanical components shall conform to the following after being tested in accordance with
Annex L:
a) shall function in accordance with the manufacturer’s performance parameters;
b) any corrosion resistant coating (such as paint) shall remain intact and shall adhere to the
surface so as not to be removable (when removal exposes a material subject to corrosion)
by such action as washing or rubbing with a fingernail;
c) dissimilar metals in contact or close proximity with one another shall show no signs of
galvanic corrosion;
d) the sample shall show no destruction of metal surfaces having no protective coating or
paint.
Equipment constructed of metallic materials other than brass, bronze or ferrous metals shall
conform to the requirements specified in 4.5.1 except that the salt spray exposure shall be 720
hrs.
4.5.2 Copper alloy components stress corrosion test
If copper alloy components are used the components shall conform to the following after being
tested in accordance with Annex M:
a) shall function in accordance with the manufacturer’s performance parameters;
b) shall show no signs of cracking when examined under 25 × magnification;
c) comply with the hydrostatic strength test under 4.3.1.
For large non-moving parts and non-pressure components the test may be carried out using
representative material samples e.g. where the large component comprises a cast and machined
component the test piece shall be similarly cast and machined. Sub-assemblies of moving parts
may be tested.
4.5.3 Internal corrosion
Other than the exception below, those parts of components which are exposed to foam
concentrate, foam solution, other specific liquids, or to unusual atmospheric conditions shall be
resistant to that exposure when tested in accordance with Annex N.
The test may be carried out either using the complete component or a sub-assembly comprising
the complete water/foam passageways.
At the conclusion of the test, check that the mechanical operation of all working parts is
unimpaired and that there are no significant corrosion effects inside or outside. Significant
corrosion defects are pits, cracks and blisters.
The foam concentrate manufacturer should always be consulted on the suitability of containers
and their linings and external paint finish, valves, fittings and pipework, for long-term storage of
concentrate or solution.
This requirement does not apply to components that are exposed to the corrosive media (i.e.
foam concentrate or foam solution) during the limited period of foam discharge.
4.6 Elastomers
Elastomeric joint rings shall conform to the requirements of Type #W of ISO 4633.
Manufacturer’s shall provide evidence that any elastomers used are compatible with the media
in which they are in contact.
4.7 Plastics and reinforced resin materials
4.7.1 General
Plastics, thermoplastics or thermosets; or reinforced resin components, which are essential to
the operation or safety of the product, shall meet the relevant requirements of 4.7.2 and 4.7.3.
4.7.2 Resistance to ageing
After ageing in accordance with Annex B, specimens of plastics and reinforced resin materials
(other than elastomeric joint rings covered in 4.6) used for components shall:
a) have a tensile strength changed by no more than 50 % of the value before exposure,
b) have an elongation at break of not less than 50 % of the value before exposure or;
c) have an impact strength not less than 50 % of the value before exposure (this method is
relevant to stiff plastics i.e. flexible plastics shall be evaluated using the tensile test),
d) show no signs of cracking.
4.7.3 Resistance to exposure to liquids
Plastics, thermoplastics or thermosets; and reinforced resin materials which come into contact
with foam concentrate, foam solution or water after exposure to the particular liquid in
accordance with Annex C shall have:
a) a tensile strength not changed by more than 50 % of the value before exposure,
b) an elongation at break of not less than 50 % of the value before exposure, or;
c) an impact strength not changed by more than 50 % of the value before exposure (this
method is relevant to stiff plastics i.e. flexible plastics shall be evaluated using the tensile
test),
d) no signs of cracking.
4.8 Heat and fire resistance
4.8.1 Sprayers and nozzles
Sprayers and nozzles, when tested in accordance with the heat resistance test in
EN 12259-1:1999+A1:2001, Annex O, shall not show significant deformation or breakage.
4.8.2 Foam generators
Foam generators intended to be located entirely within the protected (fire) area (i.e. generators
that draw air/smoke from the protected area) shall meet the requirements of 5.1 and 5.2 after
testing in accordance with Annex D.
4.9 Components for low expansion foam systems
4.9.1 Foam branchpipes
The range of discharge shall be not less than the manufacturer’s stated values when tested in
accordance with Annex H.
4.9.2 Foam sprayers
4.9.2.1 Strainers
Sprayers, which do not allow a 6,0 mm sphere to pass through the waterway, shall be protected
by a strainer. Where the sprayers are mounted on only corrosion resistant pipework (i.e.
stainless steel and cupro nickel) the strainer may be fitted at the inlet to the pipework. Where
the sprayers are mounted on steel pipework they shall each be fitted with a strainer.
The free area of the strainer shall be not less than three times the cross-sectional area of the
nozzle bore(s), the aperture size shall be no greater than 80 % of the smallest orifice.
4.9.2.2 Area coverage
The area coverage of foam sprayers when tested in accordance with the method in Annex I shall
be that area coverage in which the amount of collected water in the measuring containers (each
representing 0,25 m ) corresponds to a water density of at least 5 mm/min in average and with
no more than 10 % of containers having less than 2,5 mm. It shall be within ± 10 % of the
manufacturer’s stated limits at the stated pressures, flows and mounting heights.
4.9.3 Foam pourers and foam chambers
The passageway flow capacity shall be sufficient to pass foam at the maximum rate provided by
the largest foam maker recommended by the manufacturer for use with the pourer or chamber
when tested in accordance with Annex J.
4.9.4 Vapour seals
4.9.4.1 Upstream pressure - Non rupture
+0,1
A vapour seal shall not rupture when a positive pressure difference of 0,1 bar is applied to
the upstream (foam inlet side) face when tested in accordance with Annex J.
4.9.4.2 Upstream pressure - Rupture
+0,1
A vapour seal shall rupture when a positive pressure difference of 0,25 bar is applied to the
upstream (foam inlet side) face when tested in accordance with Annex J.
4.9.4.3 Downstream pressure - Non rupture
+0,1
A vapour seal shall not rupture when a positive pressure difference 0,1 bar is applied to the
downstream (tank side) face when tested in accordance with Annex J.
4.9.5 Low back pressure and high back pressure foam generators
These units shall generate foam within the manufacturer’s performance figures at their
minimum claimed differential pressure when tested in accordance with Annex J.
4.9.6 Semi-subsurface hose units
These units shall discharge foam within the manufacturer’s stated performance figures at their
minimum inlet pressure when tested in accordance with Annex J, and shall insert and deploy the
hose in accordance with Annex K, ready to distribute foam into a tank when tested in
accordance with Annex F.
Hoses shall be suitable for use in potentially explosive atmospheres.
4.10 Components for medium and high expansion foam systems
4.10.1 Nozzles and sprayers
Sprayers, which do not allow a 6,0 mm sphere to pass through the waterway, shall be protected
by a strainer. Where the sprayers are mounted on only corrosion resistant pipework (i.e.
stainless steel and cupro nickel) the strainer may be fitted at the inlet to the pipework. Where
the sprayers are mounted on steel pipework they shall each be fitted with a strainer.
The free area of the strainer shall be not less than three times the cross-sectional area of the
nozzle bore(s), the aperture size shall be no greater than 80 % of the smallest orifice.
4.10.2 High expansion foam generators
Nozzles of high expansion generators, which will not allow a 6,0 mm sphere to pass through the
waterway, shall be protected by a strainer. Where the high expansion generators are mounted
on only corrosion resistant pipework (i.e. stainless steel and cupro nickel) the strainer may be
fitted at the inlet to the pipework. Where the high expansion generators are mounted on steel
pipework they shall each be fitted with a strainer.
The free area of the strainer shall be not less than three times the cross-sectional area of the
nozzle bore(s), the aperture size shall be no greater than 80 % of the smallest orifice.
4.11 Tanks and pressure vessels for foam concentrates or solutions
4.11.1 General
4.11.1.1 Foam concentrate tank sediment pockets
For foam concentrate storage tanks for protein based foams and/or constructed using unlined
carbon steel the outlet from the storage tank shall be raised above the base to provide sediment
pocket. The capacities of sediment pockets shall be excluded in assessing the quantity of foam
concentrate or premix in the tank. The capacity of the sediment pocket shall be sized to contain
2 % of the tank contents.
This requirement does not apply to bladder tanks.
4.11.1.2 Storage tank connections
Storage tanks shall be provided with:
a) a means of measuring the contents;
b) outlet, filling, draining and sampling connections;
c) means of access for inspection and cleaning of internal surfaces !. This requirement does
not apply for bladder tanks."
4.11.2 Tanks at atmospheric pressure
Storage tanks at atmospheric pressure shall be provided with a means of accommodating
thermal expansion of the contents.
For storage tanks at atmospheric pressure thermal expansion may be accommodated by means
of a closed vertical riser/expansion dome with a pressure vacuum vent valve. Where storage
tanks are vented to atmosphere, the air/liquid interface should be of the minimum practicable
area in order to minimize the possibility of internal corrosion of the tank or formation of sludge.
The foam concentrate manufacturer should always be consulted to ensure that foam storage
longevity requirements are met.
4.11.3 Pressure vessels
!Pressure vessels for foam concentrate, foam solution or water shall conform to the
requirements of the EN 13445 series.
Pressure vessels construction in accordance with other technical specifications valid in the
place of use of the product are also permitted."
5 Performance Characteristics of Foam Components
5.1 Discharge coefficients and characteristics of branchpipes, sprayers and low
and high back pressure foam generators
5.1.1 Single orifice components
The discharge coefficient or pressure/flow characteristic shall be within ± 5 % of the value
stated by the manufacturer when measured in accordance with Annex E.
NOTE This effectively requires the flow rate to be within ± 5 % of that claimed by the manufacturer.
5.1.2 Multiple orifice components
The discharge coefficient or pressure/flow characteristic shall be within ± 10 % of the value
stated by the manufacturer when measured in accordance with Annex E.
NOTE This effectively requires the flow rate to be within ± 10 % of that claimed by the manufacturer.
Where such components may be used in combination with venturi type proportioning
components (i.e. injectors, eductors and inductors) the discharge coefficient or characteristic
tolerance shall be compatible with that of the proportioning component.
5.2 Quality of foam from aspirating components
5.2.1 Low and medium expansion components
The expansion and drainage time of foam produced by an aspirating component in conjunction
with any stated associated equipment, using a foam concentrate recommended by the
manufacturer and conforming to EN 1568-1 to EN 1568-4 shall conform to the manufacturer
stated values when tested in accordance with Annex F.
The expansion and drainage time of non-aspirated foam may be difficult to measure and
therefore there are no corresponding requirements for non-aspirating components.
5.2.2 High expansion components
The generator shall be of sufficient capacity to produce foam at the maximum rate specified by
the manufacturer when tested in accordance with Annex G.
Foam shall be produced by high expansion foam aspirating components in conjunction with any
associated equipment, using a foam concentrate recommended by the manufacturer and
conforming to EN 1568-2. The foam produced shall conform to manufacturer stated values for
foam production capacity and expansion when tested in accordance with Annex G.
5.3 Accuracy of proportioning components
The flow/pressure loss characteristic and foam solution concentration produced by a
proportioning component shall be within the working range as stated by the manufacturer, and
shall be within the following criteria when tested in accordance with section 2 of Nordtest
Method NT Fire 042:
a) not less than the rated concentration;
b) not more than 30 % above the rated concentration or 1 % point above the rated
concentration (whichever is less).
Other methods may be used provided correlating results can be shown.
Foam concentrate substitutes, with the equivalent viscosity characteristics, may be used when
testing proportioning components.
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