FprEN 13938-5

SLOVENSKI STANDARD
01-april-2021
Eksplozivi za civilno uporabo - Smodniki in raketna goriva - 5. del: Ugotavljanje
praznin in razpok
Explosives for civil uses - Propellants and rocket propellants - Part 5: Determination of
voids and fissures
Explosivstoffe für zivile Zwecke - Treibladungspulver und Raketentreibstoffe - Teil 5:
Bestimmung von Lunkern und Rissen
Explosifs à usage civil - Poudres propulsives et propergols pour fusées - Partie 5:
Détermination des creux et des crevasses
Ta slovenski standard je istoveten z: prEN 13938-5
ICS:
71.100.30 Eksplozivi. Pirotehnika in Explosives. Pyrotechnics and
ognjemeti fireworks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 13938-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 71.100.30 Will supersede EN 13938-5:2004
English Version
Explosives for civil uses - Propellants and rocket
propellants - Part 5: Determination of voids and fissures
Explosifs à usage civil - Poudres propulsives et Explosivstoffe für zivile Zwecke - Treibladungspulver
propergols pour fusées - Partie 5: Détermination des und Raketentreibstoffe - Teil 5: Bestimmung von
vides et des fissures Lunkern und Rissen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 321.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13938-5:2021 E
worldwide for CEN national Members.

prEN 13938-5:2021 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 5
5 NDT methods . 5
6 Destructive testing of small rocket motors . 6
6.1 Test pieces . 6
6.2 Apparatus . 6
6.3 Procedure . 8
6.4 Evaluation of test results . 8
7 Test report . 9
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/28/EU relating to the making available on the
market and supervision of explosives for civil uses aimed to be covered . 11
Bibliography . 12

prEN 13938-5:2021 (E)
European foreword
This document (prEN 13938-5:2021) has been prepared by Technical Committee CEN/TC 321
“Explosives for civil uses”, the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13938-5:2004.
In comparison with the previous edition, the following technical modifications have been made:
a) the normative references have been updated;
b) Clause 4, Principle, has been added;
c) technical revision of the method for clarification purposes;
d) Annex ZA has been updated.
This document has been prepared under a Standardization Request (M/562) annexed to the Commission
Implementing Decision C(2019)6634 final as regards Explosives for civil uses given to CEN by the
European Commission and the European Free Trade Association, and supports Essential Safety
requirements of Directive 2014/28/EU.
For relationship with Directive 2014/28/EU, see informative Annex ZA, which is an integral part of this
document.
EN 13938, Explosives for civil uses — Propellants and rocket propellants, is currently composed of the
following parts:
— Part 1: Requirements
— Part 2: Determination of resistance to electrostatic discharge
— Part 3: Determination of deflagration to detonation transition
— Part 4: Determination of burning rate under ambient conditions
— Part 5: Determination of voids and fissures
— Part 6: Solid rocket propellants — Guide for the determination of integrity of inhibitor coatings
— Part 7: Determination of safe and reliable ignition and complete deflagration of black powder
prEN 13938-5:2021 (E)
1 Scope
This document specifies a method for checking small rocket motors for voids and fissures and provides
a list of non-destructive testing (NDT) methods for detecting voids and fissures in other solid rocket
propellants.
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.
prEN 13857-1:2021, Explosives for civil uses — Part 1: Terminology
prEN 13938-1:2021, Explosives for civil uses — Propellants and rocket propellants — Part 1: Requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in prEN 13857-1:2021 and
prEN 13938-1:2021 and the following apply.
3.1
small rocket motor
rocket motor which does contain no more than 100 g of solid rocket propellant(s)
3.2
NDT method
discipline applying a physical principle in non-destructive testing
3.3
NDT technique
specific way of utilising an NDT method
3.4
NDT procedure
orderly sequence of rules, which describes step by step how and in which sequence a NDT technique
should be applied to a specific field
3.5
void
unintended inclusion of a gas bubble
3.6
fissure
unintended longitudinal discontinuity in the propellant material
3.7
solid rocket propellant
propellant consisting of one or more blocks, usually with a central hole, designed to burn in a controlled
manner
prEN 13938-5:2021 (E)
3.8
X- ray radiography
NDT method consisting in high-energy photons passing through the block of the propellant
Note 1 to entry: The difference in molecule size and material density has an influence on the absorption of the
photons. The photons that do pass through the matter end up being dark spots on the film and parts of the film that
do not catch photons result in light parts. Voids and fissures are visible as a dark spots in the material.
3.9
X- ray tomography
NDT method consisting in the gaining of the slide images in the different planes or instants o
...