EN 62086-2:2005

Electrical apparatus for explosive gas atmospheres - Electrical resistance trace heating - Part 2: Application guide for design, installation and maintenance

Pprovides guidance for the application of electrical resistance trace-heating systems in areas where explosive gas atmospheres may be present. It provides recommendations for the design, installation and maintenance of trace-heating equipment and associated control and monitoring equipment. This part supplements the requirements specified in EN 62086-1.

Elektrische Betriebsmittel für gasexplosionsgefährdete Bereiche - Elektrische Widerstands-Begleitheizungen - Teil 2: Anwendungsleitfaden für Entwurf, Installation und Instandhaltung

Matériel électrique pour atmosphères explosives gazeuses - Traçage par résistance électrique - Partie 2: Guide d'application pour la conception, l'installation et la maintenance

Fournit des lignes directrices quant à l'application des systèmes de traçage par résistance électrique dans les emplacements où l'on peut rencontrer des atmosphères explosives. Elle fournit des recommandations pour la conception, l'installation et la maintenance du matériel de traçage et du matériel associé de commande et de surveillance. La présente partie représente un complément des prescriptions spécifiées dans la EN 62086-1.

Električne naprave za eksplozivne plinske atmosfere - Električni uporovni grelni trakovi - 2. del: Vodila za zasnovo, vgraditev in vzdrževanje (IEC 62086-2:2001)

General Information

• Status: Withdrawn
• Publication Date: 05-Oct-2005
• Withdrawal Date: 31-Jan-2008
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: CLC/TC 31 - Electrical apparatus for explosive atmospheres - General requirements
• Drafting Committee: IEC/TC 31 - Electrical apparatus for potentially explosive atmospheres
• Parallel Committee: IEC/TC 31 - Electrical apparatus for potentially explosive atmospheres
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 01-Mar-2010
• Completion Date: 01-Mar-2010
• Ref Project: SIST EN 62086-2:2005 - Electrical apparatus for explosive gas atmospheres - Electrical resistance trace heating -- Part 2: Application guide for design, installation and maintenance

Relations

• Replaced By: EN 60079-30-2:2007 - Explosive atmospheres - Part 30-2: Electrical resistance trace heating - Application guide for design, installation and maintenance
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI SIST EN 62086-2:2005

STANDARD
december 2005
Električne naprave za eksplozivne plinske atmosfere - Električni uporovni
grelni trakovi - 2. del: Vodila za zasnovo, vgraditev in vzdrževanje (IEC 62086-
2:2001)
Electrical apparatus for explosive gas atmospheres - Electrical resistance trace
heating - Part 2: Application guide for design, installation and maintenance (IEC
62086-2:2001)
ICS 29.260.20 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 62086-2
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2005

ICS 29.260.20
English version
Electrical apparatus for explosive gas atmospheres –
Electrical resistance trace heating
Part 2: Application guide for design,
installation and maintenance
(IEC 62086-2:2001)
Matériel électrique pour atmosphères Elektrische Betriebsmittel für
explosives gazeuses – gasexplosionsgefährdete Bereiche –
Traçage par résistance électrique Elektrische Widerstands-Begleitheizungen
Partie 2: Guide d'application Teil 2: Anwendungsleitfaden
pour la conception, l'installation für Entwurf, Installation und
et la maintenance Instandhaltung
(CEI 62086-2:2001) (IEC 62086-2:2001)

This European Standard was approved by CENELEC on 2005-02-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62086-2:2005 E
Foreword
The text of the International Standard IEC 62086-2:2001, prepared by IEC TC 31, Electrical apparatus
for explosive atmospheres, was submitted to the CENELEC Unique Acceptance Procedure and was
approved by CENELEC as EN 62086-2 on 2005-02-01 without any modification.
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) 2006-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62086-2:2001 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62086-2:2005
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60079-0 1998 Electrical apparatus for explosive gas -
-
atmospheres
Part 0: General requirements
IEC 60079-10 Part 10: Classification of hazardous areas EN 60079-10 2)
1995 1996
IEC 60079-14 Part 14: Electrical installations in hazardous EN 60079-14 3)
1996 1997
areas (other than mines)
IEC 60079-17 Part 17: Inspection and maintenance of EN 60079-17 4)
1996 1997
electrical installations in hazardous areas
(other than mines)
IEC 62086-1 Electrical apparatus for explosive gas EN 62086-1 2005
atmospheres - Electrical resistance trace
heating
Part 1: General and testing requirements

1)
IEC 60079-0:1998 is superseded by IEC 60079-0:2004, which is harmonized as EN 60079-0:2005 (mod).
2)
EN 60079-10:1996 is superseded by EN 60079-10:2003, which is based on IEC 60079-10:2002.
3)
EN 60079-14:1997 is superseded by EN 60079-14:2003, which is based on IEC 60079-14:2002.
4)
EN 60079-17:1997 is superseded by EN 60079-17:2003, which is based on IEC 60079-17:2002.

NORME CEI
INTERNATIONALE IEC
62086-2
INTERNATIONAL
Première édition
STANDARD
First edition
2001-03
Matériel électrique pour atmosphères
explosives gazeuses –
Traçage par résistance électrique –
Partie 2:
Guide d'application pour la conception,
l'installation et la maintenance
Electrical apparatus for explosive
gas atmospheres –
Electrical resistance trace heating –
Part 2:
Application guide for design,
installation and maintenance
 IEC 2001 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
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62086-2 © IEC:2001 – 3 –
CONTENTS
Page
FOREWORD.7
Clause
1 Scope.9
2 Normative references.9
3 Definitions .9
4 Application considerations .11
4.1 General .11
4.2 Corrosive areas .11
4.3 Installation considerations.11
4.4 Process temperature accuracy.13
5 Thermal insulation .13
5.1 General .13
5.2 Selection of insulating material .15
5.3 Selection of weather barrier (cladding) .15
5.4 Selection of economical thickness.19
5.5 Double insulation .19
6 System design .23
6.1 Introduction .23
6.2 Purpose of, and major requirement for, trace heating .23
6.3 Heat loss calculations .23
6.4 Heat-up considerations .25
6.5 Heat-loss design safety factor.29
6.6 Selection of trace heater.29
6.7 Maximum temperature determination .31
6.8 Design information.35
6.9 Power system .37
6.10 Start-up at low ambient temperatures.39
6.11 Long cable runs .39
6.12 Flow pattern analysis .39
6.13 Dead-leg control technique .43
6.14 Chimney effect .43
7 Control and monitoring equipment.43
7.1 General .43
7.2 Mechanical controllers .43
7.3 Electronic controllers .45
7.4 Application suitability .45
7.5 Location of controllers .45
7.6 Location of sensors .45
7.7 Alarm considerations .47

62086-2 © IEC:2001 – 5 –
Clause Page
8 Recommendations for installation, testing and maintenance .49
8.1 Introduction .49
8.2 Application.49
8.3 Preparatory work .49
8.4 Installation of trace-heating systems .55
8.5 Installation of trace heaters.59
8.6 Installation of control and monitoring equipment.63
8.7 Installation of thermal insulation system (see also clause 5) .65
8.8 Commissioning.67
8.9 Maintenance.67
8.10 Repairs.69
Figure 1 – Thermal insulation – Weather-barrier installation.17
Figure 2 – Typical temperature profile .21
Figure 3 – Heated tank example.41
Figure 4 – Bypass example .41
Table 1 – Process types .11
Table 2 – Pre-installation checks.53
Table 3 – Pre-commissioning checks and heater installation record .73
Table 4 – Heater commissioning record.75
Table 5 – Maintenance schedule and log record .77

62086-2 © IEC:2001 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES –
ELECTRICAL RESISTANCE TRACE HEATING –
Part 2: Application guide for design,
installation and maintenance
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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
...