EN 60079-19:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosive atmospheres - Part 19: Equipment repair, overhaul and reclamationEksplozivne atmosfere - 19. del: Popravilo, obnova in remont opreme (IEC 60079-19:2006)Atmospheres explosives - Partie 19: Réparation, révision et remise en état du matérielExplosionsfähige Atmosphäre - Teil 19: Gerätereparatur, Überholung und Regenerierung29.260.20Electrical apparatus for explosive atmospheresICS:SIST EN 60079-19:2008en,fr,deTa slovenski standard je istoveten z:EN 60079-19:200701-januar-2008SIST EN 60079-19:2008SLOVENSKI
STANDARD
EUROPEAN STANDARD EN 60079-19 NORME EUROPÉENNE
EUROPÄISCHE NORM July 2007
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2007 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-19:2007 E
ICS 29.260.20
English version
Explosive atmospheres -
Part 19: Equipment repair, overhaul and reclamation (IEC 60079-19:2006)
Atmosphères explosives -
Partie 19: Réparation, révision
et remise en état du matériel (CEI 60079-19:2006)
Explosionsfähige Atmosphäre -
Teil 19: Gerätereparatur, Überholung
und Regenerierung (IEC 60079-19:2006)
This European Standard was approved by CENELEC on 2007-04-11. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

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Foreword The text of document 31J/124/FDIS, future edition 2 of IEC 60079-19, prepared by SC 31J, Classification of hazardous areas and installation requirements, of IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60079-19 on 2007-04-11. The following dates were fixed: – latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2008-02-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2010-05-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60079-19:2006 was approved by CENELEC as a European Standard without any modification. __________

- 3 - EN 60079-19:2007 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
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.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60079 Series Explosive atmospheres
EN 60079 Series
IEC 60085 -1) Electrical insulation - Thermal classification EN 60085 20042)
IEC 60529 -1) Degrees of protection provided by enclosures (IP Code) EN 60529 + corr. May
19912) 1993
IEC 61241-0 (mod)
-1) Electrical apparatus for use in the presence
of combustible dust -
Part 0: General requirements EN 61241-0 20062)
IEC 61241-2 Series Electrical apparatus for use in the presence
of combustible dust -
Part 2: Test methods - -
ISO 4526 -1) Metallic coatings - Electroplated coatings of nickel for engineering purposes EN ISO 4526 20042)
ISO 6158 -1) Metallic coatings - Electrodeposited coatings of chromium for engineering purposes EN ISO 6158 20042)
ISO 9000 -1) Quality management systems - Fundamentals and vocabulary EN ISO 9000 20052)
1) Undated reference. 2) Valid edition at date of issue.

IEC 60079-19Edition 2.0 2006-10INTERNATIONAL STANDARD NORME INTERNATIONALEExplosive atmospheres – Part 19: Equipment repair, overhaul and reclamation
Atmosphères explosives –
Partie 19: Réparation, révision et remise en état du matériel
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XAICS 29.260.20 PRICE CODECODE PRIXISBN 2-8318-8858-1

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CONTENTS FOREWORD.7 INTRODUCTION.11
1 Scope.13 2 Normative references.13 3 Terms and definitions.15 4 General.19 4.1 General principles.19 4.2 Statutory requirements.19 4.3 Instructions for the user.21 4.4 Instructions for the repair facility.21 5 Additional requirements for the repair and overhaul of equipment with type of protection "d" (flameproof).37 5.1 Application.37 5.2 Repair and overhaul.37 5.3 Reclamation.45 5.4 Modifications.47 6 Additional requirements for the repair and overhaul of equipment with type of protection "i" (intrinsic safety).49 6.1 Application.49 6.2 Repair and overhaul.51 6.3 Reclamation.55 6.4 Modifications.55 7 Additional requirements for the repair and overhaul of equipment with type of protection "p" (pressurized).55 7.1 Application.55 7.2 Repair and overhaul.55 7.3 Reclamation.61 7.4 Modifications.63 8 Additional requirements for the repair and overhaul of equipment
with type of protection "e" (increased safety).65 8.1 Application.65 8.2 Repair and overhaul.65 8.3 Reclamation.73 8.4 Modifications.75 9 Additional requirements for the repair and overhaul of equipment with type of protection "n" (non-sparking).75 9.1 Application.75 9.2 Repair and overhaul.75 9.3 Reclamation.83 9.4 Modifications.85 10 Additional requirements for the repair and overhaul of equipment covered by IEC 60079-26.85 60079-19 © IEC:2006– 2 –

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11 Additional requirements for the repair and overhaul of equipment
with type of protection ‘tD’.85 11.1 Application.85 11.2 Repair and overhaul.87 11.3 Reclamation.91 11.4 Modifications.93 12 Additional requirements for the repair and overhaul of equipment with type of protection pressurization “pD”.95 12.1 Application.95 12.2 Repair and overhaul.95 12.3 Reclamation.95 12.4 Modifications.95
Annex A (normative)
Identification of repaired equipment by marking.97 Annex B (normative)
Knowledge, skills and competencies of
“Responsible Persons” and “Operatives”.101 Annex C (normative)
Requirements for measurements in flameproof equipment during overhaul, repair and reclamation (including guidance on tolerances).105
Figure C.1 – Determination of maximum gap of reclaimed parts.109
Table C.1 – Determination of maximum gap of reclaimed parts.107
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INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
EXPLOSIVE ATMOSPHERES –
Part 19: Equipment repair, overhaul and reclamation
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-19 has been prepared by subcommittee 31J: Classification of hazardous areas and installation requirements, of IEC technical committee 31: Equipment for explosive atmospheres. This second edition cancels and replaces the first edition published in 1993 and constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows:
• additional requirements for repair and overhaul of equipment covered by IEC 60079-26 are included; • additional requirements for repair and overhaul of equipment with type of protection 'tD' and 'pD' for combustible dusts are included; 60079-19 © IEC:2006– 4 –

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• knowlege, skills and competencies of "Responsible Persons" and "Operatives" are explained; • requirements for measurements in flameproof equipment during overhaul, repair and reclamation (including guidance on tolerances) are added. The text of this standard is based on the following documents: FDIS Report on voting 31J/124/FDIS 31J/135/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60079 series, under the general title Explosive atmospheres, can be found on the the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
• reconfirmed; • withdrawn; • replaced by a revised edition, or • amended.
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INTRODUCTION When electrical equipment is installed in areas where dangerous concentrations and quantities of flammable gases, vapours, mists or dusts may be present in the atmosphere, protective measures are to be applied to reduce the likelihood of explosion due to ignition by arcs, sparks or hot surfaces produced either in normal operation or under specified fault conditions. This part of IEC 60079 is supplementary to other relevant IEC standards, for example IEC 60364, as regards installation requirements, and also refers to IEC 60079 and its appropriate parts for the design requirements of suitable electrical equipment. Clause 4 of this part of IEC 60079 contains general requirements for the repair and overhaul of equipment and should be read in conjunction with the other relevant clauses of this standard dealing with the detailed requirements for individual types of protection. In cases where protected equipment incorporates more than one type of protection, reference should be made to all clauses involved.
This part not only gives guidance on the practical means of maintaining the electrical safety and performance requirements of repaired equipment, but also defines procedures for maintaining, after repair, overhaul or reclamation, compliance of the equipment with the provisions of the certificate of conformity or with the provisions of the appropriate explosion protection standard where a certificate is not available. The nature of the explosion protection offered by each type of protection varies according to its unique features. Reference should be made to the appropriate standard(s) for details. Users will utilize the most appropriate repair facilities for any particular item of equipment, whether they be the facilities of the manufacturer or a suitably competent and equipped repairer (see note). This part recognizes the necessity of a required level of competence for the repair, overhaul and reclamation of the equipment. Some manufacturers may recommend that the equipment be repaired only by them. In the case of the repair, overhaul or reclamation of equipment which has been the subject of design certification, it may be necessary to clarify the position of the continued conformity of the equipment with the certificate. NOTE Whilst some manufacturers recommend that certain equipment be returned to them for repair or reclamation, there are also competent independent repair organizations who have the facilities to carry out repair work on equipment employing some or all of the types of protection covered by IEC 60079. For repaired equipment to retain the integrity of the type(s) of protection employed in its design and construction, detailed knowledge of the original manufacturer’s design (which may only be obtainable from design and manufacturing drawings) and any certification documentation may be necessary. Where equipment is not being returned to the original manufacturer for repair or reclamation, the use of repair organizations that are recommended by the original manufacturer should be considered.
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EXPLOSIVE ATMOSPHERES –
Part 19: Equipment repair, overhaul and reclamation
1 Scope This part of IEC 60079 – gives instructions, principally of a technical nature, on the repair, overhaul, reclamation and modification of a certified equipment designed for use in explosive atmospheres;
– is not applicable to maintenance, other than when repair and overhaul cannot be disassociated from maintenance, neither does it give advice on cable entry systems which may require renewal when the equipment is re-installed; – is not applicable to type of protection 'm'; – assumes that good engineering practices are adopted throughout. NOTE Much of the content of this standard is concerned with the repair and overhaul of electrical rotating machines. This is not because they are the most important items of explosion-protected equipment but rather because they are often major items of repairable capital equipment in which, whatever type of protection is involved, sufficient commonality of construction exists as to make possible more detailed instructions for their repair, overhaul, reclamation or modification. 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. IEC 60079 (all parts), Explosive atmospheres IEC 60085, Electrical insulation – Thermal classification IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 61241-0, Electrical apparatus for use in the presence of combustible dust – Part 0: General requirements IEC 61241-2, Electrical apparatus for use in the presence of combustible dust – Part 2: Test methods ISO 4526, Metallic coatings – Electroplated coatings of nickel for engineering purposes ISO 6158, Metallic coatings – Electrodeposited coatings of chromium for engineering purposes ISO 9000, Quality management and systems
– Fundamentals and vocabulary – 7 –60079-19 © IEC:2006

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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1
serviceable condition condition which permits a replacement or reclaimed component part to be used without prejudice to the performance or explosion protection aspects of the equipment, with due regard to the certification requirements as applicable, in which such a component part is used 3.2
repair action to restore faulty equipment to its fully serviceable condition and in compliance with the relevant standard NOTE The relevant standard means the standard to which the equipment was originally designed. 3.3
overhaul action to restore to a fully serviceable condition equipment which has been in use or in storage for a period of time but which is not faulty 3.4
maintenance routine actions taken to preserve the fully serviceable condition of the installed equipment (see Clause 1) 3.5 component part an indivisible item NOTE The assembly of such items may form equipment. 3.6
reclamation means of repair involving, for example, the removal or addition of material to reclaim component parts which have sustained damage, in order to restore such parts to a serviceable condition in accordance with the relevant standard NOTE The relevant standard means the standard to which the individual parts were originally manufactured. 3.7
modification change to the design of the equipment which affects material, fit, form or function 3.8 manufacturer maker of the equipment (who may also be the supplier, the importer or the agent) in whose name usually the certification, where appropriate, of the equipment was originally registered 3.9 user user of the equipment 60079-19 © IEC:2006– 8 –

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3.10 repair facility facility providing a service that consists of repairs, overhauls, or reclamations of explosion- protected equipment who may be the manufacturer, the user or a third party (repair agency) 3.11 certification certification leading to the issue of a certificate of conformity which refers primarily to assessments of equipment carried out by a recognized testing authority. This standard may also apply to equipment certified by other certification authorities, or to equipment which has been self-certified by manufacturers or users as complying with recognized standards. 3.12 certificate references a certificate reference number may refer to a single design or a range of equipment of similar design 3.13 symbol "X" the symbol "X" is used to denote special conditions of safe use. The certification documents need to be studied before such equipment is installed, repaired, overhauled, reclaimed or modified. 3.14
copy winding process by which a winding is totally or partially replaced by another, the characteristics and properties of which are at least as good as those of the original 3.15 type of protection "d" type of protection in which parts which can ignite an explosive atmosphere are placed in an enclosure which can withstand the pressure developed during an explosion of an explosive mixture and which prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure 3.16 type of protection "i" circuit in which no spark or any thermal effect produced in the test conditions prescribed in the relevant standard(s) (which include normal operation and specific fault condition) is capable of causing ignition of a given explosive atmosphere. 3.17 type of protection "p" type of protection by which the entry of a surrounding atmosphere into the enclosure of the electrical equipment is prevented by maintaining, inside the said enclosure, a protective gas at a higher pressure than that of the surrounding atmosphere. The overpressure is maintained either with or without a continuous flow of the protective gas. 3.18 type of protection "e" type of protection by which measures are applied so as to prevent, with a higher degree of security, the possibility of excessive temperatures and the occurrence of arcs or sparks in the interior and on the external parts of the electrical equipment which would not produce them in normal service – 9 –60079-19 © IEC:2006

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3.19 type of protection "n" type of protection applied to the electrical equipment such that, in normal operation, it is not capable of igniting the surrounding explosive atmosphere and that a fault capable of causing ignition is not likely to occur 3.20 type of protection “tD” type of protection for explosive dust atmospheres where electrical equipment is provided with an enclosure providing dust ingress protection and a means to limit surface temperatures
3.21 type of protection “pD” type of protection
reliant upon the enclosure being subjected to a continuous pressure, according to IEC 61241-2, from a supply of uncontaminated air or other non-flammable gas while electricity is connected to the enclosure 4 General 4.1 General principles This clause covers those aspects of repair, overhaul, reclamation and modification which are common to all explosion-protected equipment. Subsequent clauses provide instructions for the additional requirements relevant to specific types of protection. When equipment incorporates more than one type of protection, reference shall be made to the appropriate clauses. NOTE 1 Additional requirements for types of protection "o" and "q" have not been defined. Assuming that repairs and overhauls are carried out using good engineering practices, then a) if manufacturers' specified parts or parts as specified in the certification documentation are used in a repair or overhaul, the equipment is presumed to be in conformity with the certificate; b) if repairs or modifications are carried out on the equipment specifically as detailed in the certification documents, the equipment should still conform with the certificate. In circumstances where the certification documents are not available, then the repair or overhaul shall be carried out on the equipment in accordance with this standard and other relevant standard(s). The steps taken to obtain the certification documents shall be recorded in the repair facility records (see 4.4.1.5.3).
If other repair or modification techniques are used which are not in accordance with this standard, then it will be necessary to ascertain, from the manufacturers, and/or the certification authority, the suitability of the equipment for continued use in an explosive atmosphere. NOTE 2 Repair of equipment which has no marking plate should be avoided. 4.2 Statutory requirements 4.2.1 Repair facility The repair facility shall be aware of any specific requirements in relevant national legislation which may govern the repair or overhaul operation. 60079-19 © IEC:2006– 10 –

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4.2.2 User The equipment user should be aware of any relevant legislation should he wish to undertake the repair or overhaul of equipment himself. In addition, he should be aware of any changes in responsibility for health and safety, should refurbishment and/or re-installation be carried out by a third party. 4.3 Instructions for the user 4.3.1 Certificates and documents The equipment design certificate and other related documents (see 4.4.1.5.1) should be obtained as part of the original purchase contract. 4.3.2 Records and work instructions All relevant documentation that is available shall be obtained as part of the original purchase contract. Records of any previous repairs, overhauls or modifications shall be kept by the user and made available to the repairer. NOTE It will be in the interests of the user that the repairer is notified, whenever possible, of the fault and/or nature of the work to be done. Special requirements stipulated in the user's specifications, and which are supplementary to the various standards, e.g. enhanced ingress protection, shall be brought to the attention of the repairer. The user shall inform the repairer of any statutory requirement for compliance with certification (see note in the introduction). 4.3.3 Re-installation of repaired equipment Before the repaired equipment is re-commissioned, cable/conduit entry systems shall be checked to ensure that they are undamaged and are appropriate to the equipment type of protection. Recommendations may be found in the wiring systems clause of IEC 60079-14. 4.3.4 Repair facilities The user shall ascertain that the repair facility concerned can demonstrate compliance with the relevant stipulations of this standard.
4.4 Instructions for the repair facility 4.4.1 Repair and overhaul 4.4.1.1 General Repair facilities shall operate a Quality Management System that meets with the requirements of the ISO 9000 series of standards. The repair facility shall appoint a person ('Responsible Person') with the required competency (see Annex B), within the management organization, to accept responsibility and authority for ensuring that the overhauled/repaired equipment complies with the certification status agreed with the user. The person so appointed shall have a working knowledge of the appropriate explosion protection standards and an understanding of this standard.
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The repair facility must have adequate repair and overhaul facilities as well as the appropriate equipment necessary and trained Operatives with the required competency (see Annex B) and authority to carry out the activities, taking into account the specific type of protection. The repair facility shall conduct an assessment of the status of the equipment to be repaired, agree with the user the expected certification status of the equipment after repair and the scope of work to be done. This should include the omission of any tests mentioned within this document that the user could reasonably assume to be included. The assessment shall be documented and shall address the relevant clauses of the appropriate equipment standard and this standard and be included in the job report to the user. Such assessments shall be conducted by the Responsible Person (supported by appropriate Operatives). The Responsible Person shall only conduct assessments with the explosion protection techniques for which he has demonstrated his competence. The repair facility shall include procedures and systems to carry out overhaul/repair work at sites external to the repair facility, where appropriate. 4.4.1.2 Certification and standards The repairer’s attention is directed to the need to be informed of, and to comply with, the relevant explosion-protection standards and certification requirements applicable to the equipment to be repaired or overhauled. 4.4.1.3 Competency The repairer of the equipment shall ensure that those operatives directly concerned with the repair and/or overhaul of the certified equipment are trained, experienced, skilled, knowledgeable and/or supervised on this type of work. Training and competency assessments are specified in Annex B. Appropriate training and assessment shall be undertaken from time to time at intervals depending on the frequency of utilization of the technique or skill and change of standards or regulations. The interval should normally not exceed three years. 4.4.1.4 Testing Should it prove impracticable to carry out certain tests, e.g., a component of a complete equipment taken off site for repair such as a rotor of a rotating machine, the repairer shall, before putting the repaired equipment back into service, ascertain from the user or manufacturer the consequences of omitting such tests. NOTE In some countries, legal consequences may depend upon the extent to which the carrying out or not of certain actions or tests is practicable. 4.4.1.5 Documentation 4.4.1.5.1 General The repair facility should seek to obtain all necessary information/data from the manufacturer or user for the repair and/or overhaul of the equipment. This may include information relating to previous repairs, overhauls or modifications. He should also have available and refer to the relevant explosion-protection standard. 60079-19 © IEC:2006– 12 –

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The data available for the repair and/or overhaul should include but need not be limited to, details of the – technical specification; – drawings; – explosion protection performance and conditions of use; – dismantling and assembly instructions; – certificate limitations (special conditions for safe use), where specified; – marking (including certification marking); – recommended methods of repair/overhaul for the equipment; – list of spare parts. The information may be subject to amendments including those relative to certification. NOTE 1 It is not reasonably practicable to assume that adequate information is, or can be, so widely circulated that it is always available where and when it is needed. Sources of adequate information are users, manufacturers or certifying authorities. NOTE 2 As from IEC 60079-0 (Edition 4), manufacturers are required to give instructions including repair.
The repair facility shall maintain controlled copies of any relevant explosion protection standards with which repaired/overhauled equipment is claimed to comply. 4.4.1.5.2 Job report to the user At the completion of the work, job reports shall be submitted to the user (see 4.3.2) containing, at least, the following: – details of fault detected; – full details of repair and overhaul; – list of replaced or reclaimed parts; – results of all checks and tests (in sufficient detail to be useful if required by the next repairer, see 4.3.2);
– summary of previous history of the repaired product including information as gathered under 4.3.2; – copy of the user contract or order. The job reports of repairs/overhauls shall be retained for a period of time as agreed with the user. Retained information shall be adequately controlled to ensure correct retrieval. 4.4.1.5.3 Repair facility records The following records shall be retained by the repair facility: – current and past copies of relevant Technical Standards; – certification of Facility Quality Standard including: 1) details of Repair provider's Quality Assessment Scheme; 2)
test instrument calibration; 3)
competency and training records of personnel; 4)
purchasing control system; 5)
customer complaints system; – 13 –60079-19 © IEC:2006

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6)
internal and, where appropriate, external audit documentation; 7)
management review; 8)
process control procedures; 9)
register of manufacturer’s drawings; – job records including: 1) the steps taken to obtain the certification documents; 2) mechanical inspection record for compliance with relevant standards; 3) defect identification; 4) electrical test records before and after repair including traceability of instruments used and pass/fail criteria; 5) certificates of conformity for replacement components; 6) recovery procedure for repaired components; 7) record of mechanical inspection during assembly and upon completion; 8) record of work undertaken by the repair facility. The record of the recovery procedure for repaired components should, at least, identify the following: a) a detailed justification for the work carried out; b) various options considered (e.g., welding, metal spraying); c) technical parameters, e.g., bond strength; d) the reasons for selecting the chosen technique; e) consumables used and method of storage; f) base material; g) manufacturers’ instructions considered; h) procedure utilized; i) identity and competency of the operator; j) inspection procedure used, e.g., ultra-sonic, dye-penetration, X-ray; k) maintenance and calibration details of automatic systems. These records shall be retained for a period of at least ten years or as agreed with the user. 4.4.1.6 Spare parts 4.4.1.6.1 General It is preferable to obtain new parts from the manufacturer, and the repairer shall ensure that only appropriate spare parts are used in the repair or overhaul of certified equipment. Depending on the nature of the equipment, these spare parts may be identified by the manufacturer, the equipment standard or the relevant certification documentation. 4.4.1.6.2 Sealed parts Parts, which are required by the equipment specification and certificate documents to be sealed, shall be replaced only by the particular spare part(s) detailed in the parts list. 60079-19 © IEC:2006– 14 –

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NOTE Devices incorporated in equipment to indicate interference by third parties (e.g., security seals) as distinct from those required in the certification documents, are not intended to fall within the scope of this subclause. 4.4.1.7 Identification of repaired equipment The equipment shall be marked to identify the repair or overhaul and the repairer's identity. The marking for the repaired equipment is given in Annex A. Marking may be provided on a separate label. It may be necessary to amend or remove or supplement the label in certain circumstances as follows. a) If after repair, overhaul or modification, an equipment is changed such that it no longer conforms with the standard and certificate (see 3.11), the certification label shall be removed unless a supplementary certificate has been obtained. b) If the equipment is changed during repair or overhaul so that it still complies with the restrictions imposed by this standard and the explosion protection standards to which it was manufactured, but does not necessarily comply with the certificate, the certification label should not normally be removed and the repair symbol "R" shall be written within an inverted triangle (see Annex A). c) Where the standards to which the previously certified equipment was manufactured are not known, the requirements of this standard and the current edition of the relevant explosion protection standards shall apply. An assessment, by a person competent in assessing explosion protected equipment, shall be conducted to verify compliance with the relevant level of safety prior to release of the equipment by the repairer. 4.4.2 Reclamations 4.4.2.1 General Reclamations not affecting the explosion protection are not the subject of this subclause. Such parts should be reclaimed using good engineering practices. Where the repair process involves reclamation work, then, in addition to the requirements of 4.4.1 for repairs and overhauls, the requirements of 4.4.2 also apply. 4.4.2.2 Exclusions Some component parts are considered not to be reclaimable and are therefore excluded from the scope of this standard, such as: – component parts made from the following materials: glass, plastics, or any material that is not dimensionally stable; – fasteners; – component parts, e.g., some encapsulated assemblies, which have been stated by the manufacturer to be not subject to repair. 4.4.2.3 Requirements 4.4.2.3.1 General Any reclamation shall be carried out by competent personnel, skilled in the process to be employed and using good engineering practices (see Annex B). Operators of reclamation techniques, e.g. welding, metal spraying, shall be required to undertake a practical skill test in the technique before being permitted to utilize the technique for the first time and every three years thereafter. If the operator has not used the technique in the previous six months, he shall undertake a re-test.
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If any proprietary process is used, the instructions of the originator of such a process should be followed. All reclamation shall be properly documented and records retained. Such records include: – identification of the component part; – method of reclamation; – detail of any dimensions which differ from those in relevant certification documents or the original dimensions of the component part; – drawing showing reclamation details including material removed and replaced; – date; – name of the organization carrying out the reclamation. If the reclamation is carried out other than by the user, the user shall be provided with a copy of the record. A reclamation procedure which would result in dimensions affecting explosion-protection integrity being different from those given in relevant certification documents may be permissible if such changed dimensions still meet the requirements of the restrictions imposed by this standard and the explosion protection standards to which it was manufactured. The certification label should not be removed and the repair symbol "R" shall be written within an inverted triangle. Where the standards to which the previously certified equipment was manufactured are not known, the requirements of this standard and the current edition of the relevant explosion protection standard shall apply. An assessment, by a person competent in assessing explosion protected equipment shall be conducted to verify compliance with the relevant level of safety prior to release of the equipment by the repairer. In the event of any uncertainty regarding the permissibility, from an explosion-protection safety point of view, of an intended reclamation procedure, the advice of the manufacturer or certifying authority should be sought. It may also be necessary to carry out tests to verify that the reclamation procedure is acceptable. 4.4.2.3.2 Responsibilities If reclamations are contracted out by the repair facility to a specialized industry, such recla-mations shall be the responsibility of the repair facility. 4.4.2.4 Reclamation procedures 4.4.2.4.1 General The following outlines some of the reclamation procedures which may be applicable to explosion-protected equipment. It should be recognized that not all procedures are applicable to all types of protection. Detailed instructions are given in the appropriate clauses of this standard. 60079-19 © IEC:2006– 16 –

60079-19 © IEC:2006 – 33 –
Metal removal shall be minimized and be just sufficient to remove the defect requiring repair and provide the minimum coating thickness recommended for the technique used. Industry guidance would suggest that the removal of up to 2 % of metal thickness for metal spraying and up to 20 % for welding will not be significantly detrimental to the strength of the component. Removal of a greater thickness of material shall only be carried out after due consultation with the manufacturer or by calculation where the manufacturer is no longer available. On completion of the reclamation, the repairer shal
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