FprEN ISO 3821

SLOVENSKI STANDARD
oSIST prEN ISO 3821:2016
01-oktober-2016
Oprema za plamensko varjenje - Gumene cevi za varjenje, rezanje in sorodne
postopke (ISO/DIS 3821:2016)
Gas welding equipment - Rubber hoses for welding, cutting and allied processes
(ISO/DIS 3821:2016)
Gasschweißgeräte - Gummischläuche für Schweißen, Schneiden und verwandte
Prozesse (ISO/DIS 3821:2016)
Matériel de soudage aux gaz - Tuyaux souples en caoutchouc pour le soudage, le
coupage et les techniques connexes (ISO/DIS 3821:2016)
Ta slovenski standard je istoveten z: prEN ISO 3821
ICS:
25.160.30 Varilna oprema Welding equipment
83.140.40 Gumene cevi Hoses
oSIST prEN ISO 3821:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 3821:2016
oSIST prEN ISO 3821:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 3821
ISO/TC 44/SC 8 Secretariat: DIN
Voting begins on: Voting terminates on:
2016-08-25 2016-11-16
Gas welding equipment — Rubber hoses for welding,
cutting and allied processes
Matériel de soudage aux gaz — Tuyaux souples en caoutchouc pour le soudage, le coupage et les
techniques connexes
ICS: 83.140.40; 25.160.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 3821:2016(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
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©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2016

oSIST prEN ISO 3821:2016
ISO/DIS 3821:2016(E)
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

oSIST prEN ISO 3821:2016
ISO/DIS 3821:2016(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 2
5 Application . 2
6 Hose designation . 2
7 Materials . 3
7.1 Construction . 3
7.1.1 Light and normal duty hoses . 3
7.1.2 Flux fuel gas hose . 3
7.1.3 Twin hose . 3
7.2 Manufacture . 3
8 Dimensions and tolerances . 3
8.1 Inside diameter . 3
8.2 Concentricity (total indicator reading) . 3
8.3 Cut lengths and tolerances . 4
9 Requirements and type tests . 4
9.1 General . 4
9.2 Basic requirements . 4
9.2.1 Tensile strength and elongation at break . 4
9.2.2 Accelerating ageing . . 5
9.2.3 Adhesion . 5
9.2.4 Hydrostatic requirements . 5
9.2.5 Flexibility at ambient temperature . 5
9.2.6 Low-temperature flexibility . 5
9.2.7 Protection against incandescent particles and hot surfaces . 5
9.2.8 Ozone resistance . 5
9.3 Special requirements . 6
9.3.1 Non-ignition requirement for oxygen hoses . 6
9.3.2 Resistance to acetone and dimethylformamide for acetylene hoses . 6
9.3.3 Resistance to n-pentane . 6
9.3.4 Resistance to azeotrope of trimethylborate with methanol for flux fuel gas hoses 6
9.3.5 Flexibility of flux fuel gas hoses . 7
9.3.6 Permeability to LPG, MPS, and natural gas of methane hoses, universal
fuel gas hoses, and flux fuel gas hoses . 7
9.3.7 Requirements for twin hoses . 7
9.3.8 Requirements for universal fuel gas hose . 7
10 Hose colour and gas identification . 7
10.1 General . 7
10.2 Gas identification . 7
10.3 Marking . 8
Annex A (normative) Method of test for non-ignition . 9
Annex B (normative) Method of test for resistance to acetone and dimethylformamid (DMF) .11
Annex C (normative) Method of test for resistance to n-pentane .12
Annex D (normative) Method of test for resistance to incandescent particles and hot surfaces .13
Annex E (normative) Summary of requirements and type tests .15
Annex F (normative) Alternative oxygen gas colour codes .16
oSIST prEN ISO 3821:2016
ISO/DIS 3821:2016(E)
Bibliography .17
iv © ISO 2016 – All rights reserved

oSIST prEN ISO 3821:2016
ISO/DIS 3821:2016(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 on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 44/SC 8.
This fifth edition cancels and replaces the fourth edition which has been technically revised.
The main changes from ISO 3821:2008, 10 are:
a) Definition of maximum working pressure added;
b) Title of 7.1.1 changed from “General” to “Light and normal duty hose”
c) Table 1 “Wall thickness, inside diameter, tolerances and concentricity” revised;
d) 9.3.2 “Resistance to acetone and DMF revised;
e) 9.3.4.1 “Adhesion after conditioning in trimethylborate-methanol azeotrope” revised;
f) Requirements for marking revised;
g) New Annex B “Method of test for resistance to acetone and dimethylformamid (DMF)” added;
h) Standard editorially revised.
oSIST prEN ISO 3821:2016
oSIST prEN ISO 3821:2016
DRAFT INTERNATIONAL STANDARD ISO/DIS 3821:2016(E)
Gas welding equipment — Rubber hoses for welding,
cutting and allied processes
1 Scope
This International Standard specifies requirements for rubber hoses (including twin hoses) for welding,
cutting and al
...