EN ISO 15012-2:2008

SLOVENSKI STANDARD
01-september-2008
9DUQRVWLQ]GUDYMHSULYDUMHQMXLQVRURGQLKSRVWRSNLK=DKWHYHSUHVNXãDQMHLQ
R]QDþHYDQMHRSUHPH]DILOWULUDQMHGHO'RORþDQMHQDMPDQMãHJDYROXPVNHJD
SUHWRND]UDNDVNR]LRGVHVRYDOQHRGSUWLQH,62
Health and safety in welding and allied processes - Requirements, testing and marking of
equipment for air filtration - Part 2: Determination of the minimum air volume flow rate of
captor hoods and nozzles (ISO 15012-2:2008)
Sicherheit und Gesundheitsschutz beim Schweißen und bei verwandten Verfahren -
Anforderungen, Prüfung und Kennzeichnung von Luftreinigungssystemen - Teil 2:
Bestimmen des Mindestluftvolumenstroms von Absaughauben und Flanschplatten (ISO
15012-2:2008)
Hygiène et sécurité en soudage et techniques connexes - Exigences, essais et
marquage des équipements de filtration d'air - Partie 2: Détermination du débit
volumique minimal d'air des bouches de captage (ISO 15012-2:2008)
Ta slovenski standard je istoveten z: EN ISO 15012-2:2008
ICS:
13.040.40 (PLVLMHQHSUHPLþQLKYLURY Stationary source emissions
13.100 Varnost pri delu. Industrijska Occupational safety.
higiena Industrial hygiene
25.160.10 Varilni postopki in varjenje Welding processes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15012-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 25.160.30
English Version
Health and safety in welding and allied processes -
Requirements, testing and marking of equipment for air filtration
- Part 2: Determination of the minimum air volume flow rate of
captor hoods and nozzles (ISO 15012-2:2008)
Hygiène et sécurité en soudage et techniques connexes - Sicherheit und Gesundheitsschutz beim Schweißen und bei
Exigences, essais et marquage des équipements de verwandten Verfahren - Anforderungen, Prüfung und
filtration d'air - Partie 2: Détermination du débit volumique Kennzeichnung von Luftreinigungssystemen - Teil 2:
minimal d'air des bouches de captage (ISO 15012-2:2008) Bestimmen des Mindestluftvolumenstroms von
Absaughauben und Flanschplatten (ISO 15012-2:2008)
This European Standard was approved by CEN on 21 March 2008.
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. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15012-2:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Foreword
This document (EN ISO 15012-2:2008) has been prepared by Technical Committee CEN/TC 121 "Welding",
the secretariat of which is held by DIN, in collaboration with Technical Committee ISO/TC 44 "Welding and
allied processes".
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2008, and conflicting national standards shall be withdrawn at
the latest by October 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
INTERNATIONAL ISO
STANDARD 15012-2
First edition
2008-04-01
Health and safety in welding and allied
processes — Requirements, testing and
marking of equipment for air filtration —
Part 2:
Determination of the minimum air volume
flow rate of captor hoods and nozzles
Hygiène et sécurité en soudage et techniques connexes — Exigences,
essais et marquage des équipements de filtration d'air —
Partie 2: Détermination du débit volumique minimal d'air des bouches
de captage
Reference number
ISO 15012-2:2008(E)
©
ISO 2008
ISO 15012-2:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2008 – All rights reserved

ISO 15012-2:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 15012-2 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 121, Welding, in collaboration with Technical Committee ISO/TC 44, Welding and allied processes,
Subcommittee SC 9, Health and safety, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
ISO 15012 consists of the following parts, under the general title Health and safety in welding and allied
processes — Requirements, testing and marking of equipment for air filtration:
⎯ Part 1: Testing of the separation efficiency for welding fume
⎯ Part 2: Determination of the minimum air volume flow rate of captor hoods and nozzles
The following part is under preparation:
⎯ Part 3: Determination of the capture efficiency of welding fume extraction devices using tracer gas
Requests for official interpretations of any aspect of this part of ISO 15012 should be directed to the
Secretariat of ISO/TC 44/SC 9 via your national standards body. A complete listing of these bodies can be
found at www.iso.org.
ISO 15012-2:2008(E)
Introduction
Welding and allied processes generate fume and gases, which, if inhaled, can be harmful to human health.
Control is often required to maintain exposure at acceptable levels and this can be achieved by capturing the
fume and gases using local exhaust ventilation (LEV), which consists of a capture device, such as a captor
hood or nozzle, connected, via ducting, to an exhaust system.
The plume of welding fume rises at a velocity of about 0,3 m/s and the air draughts commonly encountered in
workshops are of the same order and can be higher. Effective capture of welding fume and gases can only be
achieved when the extracted air velocity at the emission point exceeds the resulting velocity of the draught
and the plume, so a velocity of 0,4 m/s has been selected for testing. For a particular capture device, this
capture velocity can only be achieved by applying a minimum air volume flow rate, which is dependent upon
the aspect ratio, the cross-sectional area of the device and its distance from the emission point. Consequently,
capture devices need to be used with exhaust systems that provide, at least, the minimum air volume flow rate.
The design of capture devices can be very different. Aspect ratios range from those applicable to circular
hoods to those of slots, so the size and shape of the area (capture zone) where fume and gases are captured,
while using the minimum air volume flow rate, also varies considerably. Therefore, this part of ISO 15012
requires manufacturers of capture devices to measure the minimum air volume flow rate at measurement
points selected to give an estimate of the size and shape of the capture zone.

iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 15012-2:2008(E)

Health and safety in welding and allied processes —
Requirements, testing and marking of equipment for air
filtration —
Part 2:
Determination of the minimum air volume flow rate of captor
hoods and nozzles
1 Scope
This part of ISO 15012 specifies a method for establishing the minimum air volume flow rate required for
captor hoods and nozzles to effectively capture fume and gases from welding and allied processes. The
method can be used with capture devices of any aspect ratio and cross-sectional area, but it is not applicable
to on-gun extraction systems and down draught tables.
This part of ISO 15012 also specifies the test data to be marked on the capture devices.
2 Normative references
The following referenced documents are indispensable for the application 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 12100-1, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
terminology, methodology
ISO 12100-2, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical
principles
ISO 15012-2:2008(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100-1 and ISO 12100-2 and the
following apply.
3.1
capture device
equipment for capturing welding fume at source
See Figure 1.
Key
1 entry plane (cross-sectional area for capture devices without flange)
2 nozzle
3 duct
4 nozzle with flange
5 cross-sectional area of a flanged capture device (β W 30°)
6 hood
7 hood with flange
α angle between entry plane and nozzle/hood
β angle between entry plane and flange
Figure 1 — Entry plane and cross-sectional area of different designs of capture device
3.2
capture zone
three-dimensional space in front of the entry plane of a capture device in which the air velocity is greater than
or equal to the minimum air velocity required for effective capture of welding fume
3.3
entry plan
outermost area of a capture device
3.4
cross-sectional area
area of the opening of a capture device in the entry plane (for a nozzle or hood without a flange), or, area of a
capture device in the plane in which the flange is attached, excluding the area of any obstructions in the entry
plane (for a nozzle or hood with a flange)
See Figure 1.
3.5
aspect ratio
ratio of the lengths, x and y, in the entry plane, with x W y
1 1
See Figure 2.
NOTE The aspect ratio is 1 for a circular device and greater than 1 for other shapes.
2 © ISO 2008 – All rights reserved

ISO 15012-2:2008(E)
Key
x , y , z centre point of the entry plane and origin for the meas
...