Determination of the resistance to gas explosions of passive fire protection materials

This document aims to simulate the mechanical loads that could be imparted to passive fire protection (PFP) materials and systems by explosions resulting from releases of flammable gas, pressurised liquefied gas or flashing liquid fuels that may precede a fire. This document can also be applicable to dust explosions. Gas explosions can give rise to pressure and drag forces. Damage to PFP materials in a gas explosion can be caused by the direct effects of pressure and drag loadings and by the deflection of the substrate supporting the PFP material. Other parts of the ISOÂ 23693 series will deal with a range of common types of specimen that could be tested against the mechanical loads generated.

Détermination de la résistance aux explosions de gaz des matériaux de protection passive contre l’incendie

General Information

Status
Published
Publication Date
09-Dec-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
10-Nov-2021
Completion Date
10-Nov-2021
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ISO 23693-1:2021 - Determination of the resistance to gas explosions of passive fire protection materials
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INTERNATIONAL ISO
STANDARD 23693-1
First edition
2021-12
Determination of the resistance to gas
explosions of passive fire protection
materials —
Part 1:
General requirements
Détermination de la résistance aux explosions de gaz des matériaux
de protection passive contre l’incendie —
Partie 1: Exigences générales
Reference number
ISO 23693-1:2021(E)
© ISO 2021
---------------------- Page: 1 ----------------------
ISO 23693-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

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Published in Switzerland
© ISO 2021 – All rights reserved
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ISO 23693-1:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Explosion loading ................................................................................................................................................................................................1

4.1 Overpressure loading ....................................................................................................................................................................... 1

4.1.1 Finite rise time ..................................................................................................................................................................... 2

4.1.2 Instantaneous rise time ............................................................................................................................................... 2

4.2 Drag loading .............................................................................................................................................................................................. 3

4.3 Means of generating loads ............................................................................................................................................................ 3

4.3.1 General ........................................................................................................................................................................................ 3

4.3.2 Confined gas explosion ................................................................................................................................................. 3

4.3.3 Unconfined gas explosion ........................................................................................................................................... 3

4.3.4 Shock tube ................................................................................................................................................................................ 4

4.3.5 Solid explosive detonations ...................................................................................................................................... 4

5 Test specimens ....................................................................................................................................................................................................... 4

6 Environmental conditions ......................................................................................................................................................................... 4

7 Instrumentation ................................................................................................................................................................................................... 4

7.1 General ........................................................................................................................................................................................................... 4

7.2 Pressure transducers ....................................................................................................................................................................... 4

7.3 Temperature ............................................................................................................................................................................................. 5

7.4 Deflection .................................................................................................................................................................................................... 5

7.5 Strain ............................................................................................................................................................................................................... 5

7.6 Data acquisition ..................................................................................................................................................................................... 5

7.7 Photography .............................................................................................................................................................................................. 5

7.8 Video ................................................................................................................................................................................................................ 5

8 Test specification ................................................................................................................................................................................................ 5

9 Data analysis ............................................................................................................................................................................................................ 6

10 Test acceptability criteria .......................................................................................................................................................................... 7

11 Test report .................................................................................................................................................................................................................. 7

iii
© ISO 2021 – All rights reserved
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ISO 23693-1:2021(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.

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 92, Fire safety, Subcommittee SC 2, Fire

containment.
A list of all parts in the ISO 23693 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.
© ISO 2021 – All rights reserved
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INTERNATIONAL STANDARD ISO 23693-1:2021(E)
Determination of the resistance to gas explosions of
passive fire protection materials —
Part 1:
General requirements
1 Scope

This document aims to simulate the mechanical loads that could be imparted to passive fire protection

(PFP) materials and systems by explosions resulting from releases of flammable gas, pressurised

liquefied gas or flashing liquid fuels that may precede a fire. This document can also be applicable to

dust explosions. Gas explosions can give rise to pressure and drag forces. Damage to PFP materials in a

gas explosion can be caused by the direct effects of pressure and drag loadings and by the deflection of

the substrate supporting the PFP material. Other parts of the ISO 23693 series will deal with a range of

common types of specimen that could be tested against the mechanical loads generated.

2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
drag load

load on items resulting from the flow of gas generated by a venting gas explosion

3.2
impulse
area under a pressure-time history curve
3.3
overpressure
difference between actual pressure and ambient pressure
3.4
rise time
time for the pressure in a blast wave to rise to the peak overpressure
4 Explosion loading
4.1 Overpressure loading

Overpressure loadings shall be characterised as one of two idealised overpressure-time histories that

can occur.
© ISO 2021 – All rights reserved
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ISO 23693-1:2021(E)
4.1.1 Finite rise time

The type of loading that would occur to items close to or inside a gas cloud has a finite rise time. Its

characteristics are defined by a peak overpressure, minimum rise time and impulse, as shown in

Figure 1.
Key
X time
Y overpressure
Peak overpressure.
Impulse.
Duration.
Rise time.
Figure 1 — Example of overpressure-time plot for a finite rise time
4.1.2 Instantaneous rise time

Shock loading that can occur in the far field of a gas explosion has an instantaneous rise time. Its

characteristics are defined by peak overpressure and impulse, see Figure 2.
© ISO 2021 – All rights reserved
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ISO 23693-1:20
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