Thermal insulating products for industrial installations — Determination of the coefficient of linear thermal expansion at sub-ambient temperatures

This document specifies the equipment and procedures for determining the coefficient of linear thermal expansion at sub-ambient temperatures (−196 °C to 25 °C), subject to the possible temperature limitation of the test specimens. It is not applicable to products which experience dimensional changes during the test due to the loss of hydration water or which undergo other phase changes.

Produits isolants thermiques pour les installations industrielles — Détermination du coefficient de dilatation thermique linéique à des températures inférieures à la température ambiante

General Information

Status
Published
Publication Date
13-Mar-2022
Current Stage
4060 - Close of voting
Start Date
05-Aug-2021
Completion Date
04-Aug-2021
Ref Project

Buy Standard

Standard
ISO 23766:2022 - Thermal insulating products for industrial installations — Determination of the coefficient of linear thermal expansion at sub-ambient temperatures Released:3/14/2022
English language
9 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 23766
First edition
2022-03
Thermal insulating products
for industrial installations —
Determination of the coefficient of
linear thermal expansion at sub-
ambient temperatures
Produits isolants thermiques pour les installations industrielles —
Détermination du coefficient de dilatation thermique linéique à des
températures inférieures à la température ambiante
Reference number
ISO 23766:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 23766:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 23766:2022(E)
Contents Page

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

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

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

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

4 Method A — Optical method ....................................................................................................................................................................1

4.1 Principle ....................................................................................................................................................................................................... 1

4.2 Apparatus .................................................................................................................................................................................................... 2

4.2.1 Light source system ......................................................................................................................................................... 2

4.2.2 Light detector system .................................................................................................................................................... 2

4.2.3 Test chamber and cooling system ....................................................................................................................... 2

4.2.4 Temperature-measuring instruments ............................................................................................................ 3

4.2.5 Equipment to prepare the test specimen ..................................................................................................... 3

4.3 Test specimen .......................................................................................................................................................................................... 3

4.3.1 Dimensions of test specimens ................................................................................................................................ 3

4.3.2 Preparation of test specimens ............................................................................................................................... 3

4.3.3 Number of test specimens ................................... ....................................................................................................... 3

4.4 Conditioning of test specimens ................................................................................................................................................ 3

4.5 Procedure .................................................................................................................................................................................................... 4

5 Method B — Displacement method .................................................................................................................................................. 4

5.1 Principle ....................................................................................................................................................................................................... 4

5.2 Apparatus .................................................................................................................................................................................................... 5

5.2.1 Sensor for distance ........................................................................................................................................................... 5

5.2.2 Test chamber and cooling system ....................................................................................................................... 5

5.2.3 Temperature-measuring instruments ............................................................................................................ 5

5.2.4 Equipment to prepare the test specimen ..................................................................................................... 5

5.3 Test specimen .......................................................................................................................................................................................... 5

5.3.1 Dimensions of test specimens ................................................................................................................................ 5

5.3.2 Preparation of test specimens ............................................................................................................................... 5

5.3.3 Number of test specimens ................................... ....................................................................................................... 6

5.4 Conditioning of test specimens ................................................................................................................................................ 6

5.5 Procedure .................................................................................................................................................................................................... 6

6 Calculation and expression of results ........................................................................................................................................... 6

7 Accuracy of measurement..........................................................................................................................................................................7

8 Test report .................................................................................................................................................................................................................. 7

Bibliography ................................................................................................................................................................................................................................ 9

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 23766:2022(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 163, Thermal performance and energy use

in the built environment, Subcommittee SC 1, Test and measurement methods.

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 2022 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 23766:2022(E)
Thermal insulating products for industrial installations —
Determination of the coefficient of linear thermal
expansion at sub-ambient temperatures
1 Scope

This document specifies the equipment and procedures for determining the coefficient of linear

thermal expansion at sub-ambient temperatures (−196 °C to 25 °C), subject to the possible temperature

limitation of the test specimens. It is not applicable to products which experience dimensional changes

during the test due to the loss of hydration water or which undergo other phase changes.

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 9229, Thermal insulation — Vocabulary

ISO 18099, Thermal insulating products for building equipment and industrial installations —

Determination of the coefficient of thermal expansion
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 9229, ISO 18099 and the

following 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/o bp
— IEC Electropedia: available at https:// www.e lectropedia. org/
3.1
sub-ambient temperature

temperature from −196 °C to 25 °C at which the thermal insulation product is used to reduce heat flow

4 Method A — Optical method
4.1 Principle

The changes in a product’s linear dimensions, as its temperature is changed, are measured and

characterized by the optical measurement method (See Figure 1 for an example).
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 23766:2022(E)
Key
1 light source
2 light
3 collimator lens
4 parallel light beam, wider than the test specimen
5 test specimen, with dimension of 10 mm to 30 mm
6 detector, wider than the light beam
7 test chamber
Figure 1 — Example of an apparatus for optical method
4.2 Apparatus
4.2.1 Light source system

An InGaN-based light source which can project a broad-width planar parallel light beam onto the

sample and detector. The collimator lens should be used to keep the light beam parallel within 2”

(≈ 0,009 696 mrad).
4.2.2 Light detector system

The light beam with the shadow of the sample is detected by a sensor. The signal is then evaluated

by a digital edge-detection processor which provides a sensitive and precise measurement of the

dimensions of the sample before and after expansion. It shall be calibrated over the required range to

within 2 × 10 × l for the length.
4.2.3 Test chamber and cooling system

Capable of maintaining the mean temperature of the test specimen to within ± 0,5 K of the desired test

temperature.

The test chamber shall be capable of limiting the rate of temperature change to 1 °C/min during the

change from one test temperature to another. The disk-shaped chamb
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.