ISO 7076-2:2012

Fire protection - Foam fire extinguishing systems — Part 2: Low expansion foam equipment

This International Standard specifies requirements and test methods for low expansion foam equipment of fixed-foam extinguishing systems for indoor or outdoor use or both. This International Standard is applicable to sprayers, branchpipes, monitors, low expansion foam generators, foam chambers, etc.

Protection contre l'incendie — Systèmes d'extinction d'incendie à mousse — Partie 2: Équipement pour mousse à faible foisonnement

General Information

• Status: Published
• Publication Date: 03-May-2012
• ICS: 13.220.10 - Fire-fighting
• Technical Committee: ISO/TC 21/SC 6 - Foam and powder media and firefighting systems using foam and powder
• Drafting Committee: ISO/TC 21/SC 6 - Foam and powder media and firefighting systems using foam and powder
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 14-Mar-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7076-2
First edition
2012-05-15
Fire protection — Foam fire
extinguishing systems —
Part 2:
Low expansion foam equipment
Protection contre l’incendie — Systèmes d’extinction d’incendie à
mousse —
Partie 2: Équipement pour mousse à faible foisonnement
Reference number
ISO 7076-2:2012(E)
©
ISO 2012

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ISO 7076-2:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
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Published in Switzerland
ii © ISO 2012 – All rights reserved

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ISO 7076-2:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements . 3
4.1 Connections . 3
4.2 Parts for removal during routine field maintenance . 3
4.3 Corrosion resistance of metal parts . 3
4.4 Elastomeric joint rings . 3
4.5 Plastics and reinforced resin materials . 3
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 Range of discharge . 5
4.12 Vapour seal . 5
4.13 Operation reliability . 5
4.14 Stress corrosion . 5
4.15 Salt-spray corrosion . 5
4.16 Light and water exposure . 5
4.17 Heat and fire resistance . 6
5 Test methods . 6
5.1 General . 6
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 . 7
5.8 Water flow test . 7
5.9 Range tests for branchpipe and monitor . 7
5.10 Vapour sealing test . 7
5.11 Operation reliability test . 7
5.12 Stress corrosion test . 8
5.13 Salt-spray corrosion test . 8
5.14 Light and water exposure test . 9
5.15 Heat and fire resistance . 9
6 Marking . 9
7 Manufacturer’s installation and operation instructions . 9
Annex A (normative) Tolerances .10
Bibliography . 11
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ISO 7076-2:2012(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 7076-2 was prepared by Technical Committee 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
1)
— Part 5: Compressed air foam equipment
1) To be published.
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INTERNATIONAL STANDARD ISO 7076-2:2012(E)
Fire protection — Foam fire extinguishing systems —
Part 2:
Low expansion foam equipment
1 Scope
This International Standard specifies requirements and test methods for low expansion foam equipment of
fixed-foam extinguishing systems for indoor or outdoor use or both.
This International Standard is applicable to sprayers, branchpipes, monitors, low expansion foam generators,
foam chambers, etc.
2 Normative references
The following referenced documents are indispensable for the application 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
ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 180, Plastics — Determination of Izod impact strength
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 — Part 2: Nuts with specified proof load values — Coarse 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 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification
for materials
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 7203-1, Fire extinguishing media — Foam concentrates — Part 1: Specification for low-expansion foam
concentrates for top application to water-immiscible liquids
ISO 7203-3, Fire extinguishing media — Foam concentrates — Part 3: Specification for low-expansion foam
concentrates for top application to water-miscible liquids
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ISO 7076-2:2012(E)
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
branchpipe
component which projects foam in the form of a jet or spray
3.2
discharge coefficient (K factor)
Q
“k” factor for the equation K =
10×P
NOTE Q is the flow rate through the component in l/min and P is the inlet pressure in MPa.
3.3
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 A foam generator may be connected to the foam chamber inlet.
3.4
foam expansion ratio
ratio of the volume of foam to the volume of the foam solution from which it was made
3.5
foam generator
component which introduces air into the foam solution stream for delivery against a low back pressure, i.e.
discharge against atmospheric pressure
3.6
low expansion foam
foam which has an expansion ratio not greater than 20
3.7
monitor
component consisting of a branchpipe and turret
3.8
sprayer
open nozzle which discharges a spray of foam or foam solution
3.9
25 % drainage time
time for 25 % of the liquid content of a foam to drain out
3.10
vapour seal
frangible component designed to prevent tank content vapours from entering the foam pipeline system while
allowing foam to flow into the tank during system operation
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ISO 7076-2:2012(E)
3.11
high back pressure foam generator
component which introduces air into the foam solution stream for delivery against a high back pressure
NOTE For example, as is found in tank sub-surface injection.
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
Those parts of components that are exposed to foam concentrate or foam solution shall be resistant to corrosion
from that exposure.
Those 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
Elastomeric joint rings shall conform to the requirements of Type W of ISO 4633.
4.5 Plastics and reinforced resin materials
4.5.1 General
Plastic or reinforced resin components, which are essential to the operation or safety of the product, shall meet
the relevant requirements of 4.5.2 and 4.5.3.
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ISO 7076-2:2012(E)
4.5.2 Resistance to ageing
After ageing in accordance with 5.2 and the appropriate sections of ISO 527-1, ISO 179-1 and ISO 180,
specimens of plastics and reinforced resin materials used for components shall:
a) have a tensile strength of no less than 50 % of the value before exposure;
b) have an elongation at break of no less than 50 % of the value before exposure; or
c) have an impact strength of no 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.
4.5.3 Resistance to exposure to liquids
Plastics and reinforced resin materials which come into contact with foam concentrate, foam solution or
water after exposure to the particular liquid in accordance with 5.3 and the appropriate sections of ISO 527-1,
ISO 179-1 and ISO 180, shall
a) have a tensile strength of no less than 50 % of the value before exposure;
b) have an elongation at break of no less than 50 % of the value before exposure; or
c) have an impact strength of no less than 50 % of the value before exposure (this method is relevant to stiff
plastics, i.e. flexib
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