ISO 7076-3:2016

INTERNATIONAL ISO
STANDARD 7076-3
First edition
2016-07-01
Fire protection — Foam fire
extinguishing systems —
Part 3:
Medium expansion foam equipment
Protection contre l’incendie — Systèmes d’extinction d’incendie à
mousse —
Partie 3: Équipement pour mousse à moyen foisonnement
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements . 2
4.1 Connections . 2
4.1.1 Permanent connections and joints . 2
4.1.2 Bolting of pressure-retaining parts . 2
4.2 Parts for removal during routine field maintenance . 2
4.2.1 Removal . 2
4.2.2 Re-assembly . 2
4.3 Corrosion resistance of metal parts . 2
4.4 Elastomeric joint rings . 3
4.4.1 General. 3
4.4.2 Resistance to aging . . 3
4.4.3 Resistance to exposure to liquids . 3
4.5 Plastics and reinforced resin materials . 3
4.5.1 General. 3
4.5.2 Resistance to ageing . 3
4.5.3 Resistance to exposure to liquids . 4
4.6 Strength . 4
4.7 Leak resistance . 4
4.8 Discharge coefficient (K factor) . 4
4.9 Foam quality . 4
4.10 Water flow . 5
4.11 Operation reliability . 5
4.12 Stress corrosion. 5
4.13 Salt-spray corrosion . 5
4.14 Light and water exposure . 5
4.15 Heat and fire resistance . 5
5 Test methods . 5
5.1 General . 5
5.2 Ageing test for plastics and reinforced resin materials . 6
5.3 Liquid exposure test . 6
5.4 Equipment pressurization test . 6
5.5 Leak resistance test . 6
5.6 Flow coefficient measurement . 6
5.7 Measurement of expansion ratio and drainage time . 6
5.8 Water flow test . 7
5.9 Operation reliability test . 7
5.10 Stress corrosion test . 7
5.11 Salt-spray corrosion test . 8
5.12 Light and water exposure test . 8
5.13 Heat and fire resistance test . 8
6 Marking . 8
7 Manufacturer’s installation and operation instructions . 9
Annex A (normative) Tolerances .10
Bibliography .11
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
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electrotechnical standardization.
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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).
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on the ISO list of patent declarations received (see www.iso.org/patents).
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For an explanation on 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: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 6, Foam and powder media and firefighting systems using foam and powder.
ISO 7076 consists of the following parts, under the general title Fire protection — Foam fire extinguishing
systems:
— Part 1: Foam proportioning equipment
— Part 2: Low expansion foam equipment
— Part 3: Medium expansion foam equipment
— Part 4: High expansion foam equipment
— Part 5: Fixed compressed air foam equipment
— Part 6: Vehicle mounted compressed air foam systems
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 7076-3:2016(E)
Fire protection — Foam fire extinguishing systems —
Part 3:
Medium expansion foam equipment
1 Scope
This part of ISO 7076 specifies requirements and test methods for medium expansion foam equipment
of fixed-foam extinguishing systems for indoor or outdoor use or both.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 180, Plastics — Determination of Izod impact strength
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 272, Fasteners — Hexagon products — Widths across flats
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 885, General purpose bolts and screws — Metric series — Radii under the head
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 898-2, 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 1179-1, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with
elastomeric or metal-to-metal sealing — Part 1: Threaded ports
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 4759-1, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C
ISO 7005-1, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
ISO 7203-2:2011, Fire extinguishing media — Foam concentrates — Part 2: Specification for medium- and
high-expansion foam concentrates for top application to water-immiscible liquids
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ASTM D638, Standard test method for tensile properties of plastics
ASTM G155, Standard practice for operating xenon arc light apparatus for exposure of non-metallic
materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
medium expansion foam
foam with 21 to 200 expansion ratio range
4 Requirements
4.1 Connections
4.1.1 Permanent connections and joints
Permanent joints shall conform to ISO 7-1, ISO 228-1, ISO 1179-1, ISO 7005-1 or ISO 7005-2, as applicable,
or shall conform to other technical specifications valid in the place of use where International Standards
are not applicable.
4.1.2 Bolting of pressure-retaining parts
Bolts, nuts or studs or both used to fasten pressure-retaining parts shall conform to ISO 272, ISO 885
and ISO 4759-1 or shall conform to other technical specifications valid in the place of use where
International Standards are not applicable.
4.2 Parts 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 in a manner other than as intended.
4.3 Corrosion resistance of metal parts
Parts of components that are exposed to foam concentrate or foam solution shall be resistant to
corrosion from that exposure.
2 © ISO 2016 – All rights reserved

Parts of components that are intended to freely move during operation or bear against, rotate within,
or slide on stationary parts shall be of a corrosion-resistant material.
NOTE Bronze is a typical material that has corrosion-resistant properties when exposed to foam concentrate
or foam solution.
4.4 Elastomeric joint rings
4.4.1 General
Elastomeric joint rings shall have the following properties when tested in accordance with ISO 37
and ISO 48.
a) For as-received silicone rubber with basic constituent of poly-organo-siloxane, a minimum tensile
strength of 3,4 MPa, a minimum ultimate elongation of 100 %, and a hardness within ±5 units of
the manufacturer’s specification.
b) For as-received fluoroelastomers, a minimum tensile of 6,9 MPa, a minimum ultimate elongation of
150 %, and a hardness within ±5 units of the manufacturer’s specification.
c) For as-received natural rubber and as-received synthetic rubber other than silicone or
fluoroelastomers, a minimum tensile of 8,3 MPa, a minimum ultimate elongation of 150 % and a
hardness within ±5 units of the manufacturer’s specification.
4.4.2 Resistance to aging
When tested in acco
...