SIST-TS CEN/TS 993-11:2004

Dense shaped refractory products - Part 11: Determination of resistance to thermal shock

This Technical Specification specifies two alternative methods for determining the resistance to thermal shock of dense shaped refractory materials by the air quenching method which proved to give the most reliable results as compared with the behaviour of the refractories placed in furnace linings. Method B can be applied to unshaped refractory materials too.

Prüfverfahen für dichte geformte feuerfeste Erzeugnisse - Teil 11: Bestimmung der Temperaturwechselbeständigkeit

Diese Technische Spezifikation legt zwei alternative Verfahren zur Bestimmung der Temperaturwechsel-beständigkeit von dichten geformten feuerfesten Erzeugnissen durch Abschrecken an Luft fest, für die nach-gewiesen wurde, dass sie, verglichen mit dem Verhalten von feuerfesten Erzeugnissen in Ofenauskleidungen, die zuverlässigsten Ergebnisse liefern. Verfahren B ist auch auf ungeformte feuerfeste Werkstoffe anwendbar.

Méthodes d'essai des produits réfractaires façonnés denses - Partie 11: Détermination de la résistance au choc thermique

La présente Spécification technique européenne définit une méthode de détermination de la résistance aux chocs thermiques des produits réfractaires façonnés denses par la méthode de trempe a l'air ; il a été prouvé que, par comparaison avec le comportement des réfractaires placés dans les revetements de fours, cette méthode donnait les résultats les plus fiables.

Gosti oblikovani ognjevzdržni izdelki - 11. del: Ugotavljanje odpornosti proti hitrim temperaturnim spremembam

General Information

• Status: Withdrawn
• Publication Date: 30-Apr-2004
• Withdrawal Date: 21-Jan-2008
• ICS: 81.080 - Refractories
• Technical Committee: IKER - Ceramics
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 18-Jan-2008
• Due Date: 10-Feb-2008
• Completion Date: 22-Jan-2008
• Ref Project: CEN/TS 993-11:2003 - Dense shaped refractory products - Part 11: Determination of resistance to thermal shock

Relations

• Replaces: SIST ENV 993-11:1998 - Dense shaped refractory products - Part 11: Determination of resistance to thermal shock
• Effective Date: 01-May-2004
• Replaced By: SIST EN 993-11:2008 - Methods of test for dense shaped refractory products - Part 11: Determination of resistance to thermal shock
• Effective Date: 01-Mar-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TS CEN/TS 993-11:2004
01-maj-2004
1DGRPHãþD
SIST ENV 993-11:1998
Gosti oblikovani ognjevzdržni izdelki - 11. del: Ugotavljanje odpornosti proti hitrim
temperaturnim spremembam
Dense shaped refractory products - Part 11: Determination of resistance to thermal
shock
Prüfverfahen für dichte geformte feuerfeste Erzeugnisse - Teil 11: Bestimmung der
Temperaturwechselbeständigkeit
Méthodes d'essai des produits réfractaires façonnés denses - Partie 11: Détermination
de la résistance au choc thermique
Ta slovenski standard je istoveten z: CEN/TS 993-11:2003
ICS:
81.080
SIST-TS CEN/TS 993-11:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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TECHNICAL SPECIFICATION
CEN/TS 933-11
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
August 2003
ICS 81.080 Supersedes ENV 993-11:1997
English version
Dense shaped refractory products — Part 11: Determination of
resistance to thermal shock
Prüfverfahen für dichte geformte feuerfeste Erzeugnisse –
Teil 11: Bestimmung der Temperaturwechselbeständigkeit
This Technical Specification (CEN/TS) was approved by CEN on 23 January 2003 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available. It
is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible
conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 993-11:2003 E
worldwide for CEN national Members.

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CEN/TS 993-11:2003 (E)
Contents
Foreword.3
Introduction .4
1 Scope .4
2 Normative references .5
3 Terms and definitions.5
4 Principle.5
4.1 Method A.5
4.2 Method B.5
5 Apparatus .5
6 Test pieces.6
6.1 Number of test pieces .6
6.1.1 Method A.6
6.1.2 Method B.6
6.2 Preparation of test pieces.6
6.2.1 Shape .6
6.2.2 Drying of the test pieces .6
7 Procedure .7
7.1 Heating.7
7.2 Cooling.7
7.3 Measurement.7
7.3.1 Method A.7
7.3.2 Method B.7
8 Expression of results .8
8.1 Method A.8
8.2 Method B.8
9 Test report .8
2

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CEN/TS 993-11:2003 (E)
Foreword
This document CEN/TS 993-11:2003 has been prepared by Technical Committee CEN /TC 187, "Refractory
products and materials", the secretariat of which is held by BSI.
This document supersedes ENV 993-11:1997.
Reproducibility and repeatability data are not available at present but will perhaps be included in a subsequent
edition.
EN 993 'Methods of test for dense shaped refractory products' consists of 20 Parts:
Part 1 : Determination of bulk density, apparent porosity and true porosity
Part 2 : Determination of true density
Part 3 : Test methods for carbon-containing refractories
Part 4 : Determination of permeability to gases
Part 5 : Determination of cold crushing strength
Part 6 : Determination of modulus of rupture at ambient temperature
Part 7 : Determination of modulus of rupture at elevated temperatures
Part 8 : Determination of refractoriness-under-load
Part 9 : Determination of creep in compression
Part 10 : Determination of permanent change in dimensions on heating
Part 11 : Determination of resistance to thermal shock
Part 12 : Determination of pyrometric cone equivalent (refractoriness)
Part 13 : Specification for pyrometric reference cones for laboratory use
Part 14 : Determination of thermal conductivity by the hot-wire (cross-array) method
Part 15 : Determination of thermal conductivity by the hot-wire (parallel) method
Part 16 : Determination of resistance to sulphuric acid
Part 17 : Determination of bulk density of granular materials by the mercury method with vacuum
Part 18 : Determination of bulk density of granular materials by the water method with vacuum
Part 19 : Determination of thermal expansion
Part 20 : Determination of resistance to abrasion at ambient temperature
3

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CEN/TS 993-11:2003 (E)
Introduction
Thermal shock of refractory materials placed in furnaces is influenced by three items:
 brick dimensions;
 heating/cooling conditions;
 material properties
Thermal shock tests usually intend to test material properties. This is done by standardizing brick dimensions and
heating conditions. In this way, a relative order of the quality of different types of bricks can be established.
However, in case of thermal shock, this can lead to complications in the field of engineering.
The major complication is that, depending on the type of heating conditions, various material properties are
involved. This can be best illustrated on the basis of thermal stress parameters which are a measure for critical
crack initiation.
Table 1 — Type of heating condition
Hot face condition Stress parameter Example
sudden temperature jump filling of metallurgical vesselse /a
constant heat flow into brick Furnace preheatingl .e /a
constant heating rate Controlled preheatingl /(r. c ) .e /ap
Where:
e maximum allowable deformation
a coefficient of expansion
l thermal conductivity
r bulk d
...