Electrical resistance trace heating systems for industrial and commercial applications - Part 2: Application guide for system design, installation and maintenance (IEC/TS 62395-2:2008)

This part of IEC 62395 provides detailed recommendations for the system design, installation, maintenance and repair of electrical resistance trace heating systems in industrial and commercial applications. This technical specification does not include or provide for any applications in potentially explosive atmospheres. This specification pertains to trace heating systems that may comprise either factory constructed or field (work-site) assembled units, and which may be series heater cables, parallel heater cables, heater pads or heater panels that have been assembled and/or terminated in accordance with the manufacturer’s instructions for connection to voltage supplies up to and including 450 V/750 V. This Technical specification does not cover induction, impedance or skin effect heating. Trace heating systems can be grouped into different types of installations. These are characterized by different requirements for testing and are usually certified for a specific type of installation or application. Typical applications for the different types of installation are as follows:
a) Installations of trace heating on pipes, vessels and associated equipment. Applications
include:
– freeze protection and temperature maintenance;
– hot water lines;
– oil and chemical lines;
– sprinkler systems.
b) Outdoor exposed area installations of trace heating. Applications include:
– roof de-icing;
– gutter and downspout de-icing;
– catch basins and drains;
– rail heating.
c) Installation with embedded trace heating. Applications include:
– snow melting;
– floor warming;
– frost heave prevention;
– underground thermal energy storage systems;
– door frames.
d) Installations with trace heating inside conduit or piping. Applications include:
– snow melting – in conduit;
– floor warming – in conduit;
– frost heave prevention – in conduit;
– underground thermal energy storage systems – in conduit;
– internal trace heating of potable water lines;
– enclosed drains and culverts.

Elektrische Begleitheizungen (Trace- Widerstandsheizungen) für industrielle und gewerbliche Zwecke - Teil 2: Anwendungsleitfaden für Systementwurf, Installation und Wartung (IEC/TS 62395-2:2008)

Systèmes de traçage par résistance électrique pour applications industrielles et commerciales - Partie 2: Guide d'application pour la conception, l'installation et la maintenance du système (CEI/TS 62395-2:2008)

Industrijski in komercialni sistemi električnih uporovnih grelnih trakov - 2. del: Vodilo za načrtovanje sistema, namestitev in vzdrževanje (IEC/TS 62395-2:2008)

Ta del IEC 62395 določa podrobna priporočila za načrtovanje, namestitev, vzdrževanje in popravila industrijskih in komercialnih sistemov električnih uporovnih grelnih trakov. Ta tehnična specifikacija ne vključuje ali zagotavlja kakršne koli uporabe v potencialno eksplozivnih atmosferah. Ta specifikacija se nanaša na sledenje grelnim sistemom, ki so sestavljeni bodisi iz v tovarni sestavljenih ali na terenu (lokaciji dela) montiranih enot, ki so lahko serijski kabli za grelce, paralelni kabli za grelce, ploskve ali plošče grelcev, ki so bili montirani in/ali zaključeni v skladu z navodili proizvajalca za povezavo z napetostjo napajanja do in vključno 450 V/750 V. Ta tehnična specifikacija ne zajema indukcijskega gretja in impedančnega gretja ali gretja z učinkom na kožo. Sistemi za sledenje gretju so lahko razvrščeni v skupine različnih tipov namestitev. Te določajo različne zahteve za preskušanje ter so običajno certificirane za določen tip namestitve ali uporabe. Tipične uporabe za različne tipe namestitev so, kot sledi:
a) namestitve cevi, posod in povezane opreme za sledenje ogrevanju. Uporabe
vključujejo:
- varovanje pred zamrzovanjem in vzdrževanje temperature;
- vode za toplo vodo;
- vode za olje in kemične vode;
- sisteme za škropljenje.
b) Namestitve sledenja ogrevanju na področjih, ki so podvržena zunanjim vplivom. Uporabe vključujejo:
- razledenitev streh;
- razledenitev žlebov in odtočnih cevi;
- lovilne bazene in drenažne cevi;
- ogrevanje tračnic.
c) Namestitev z vdelanim sledenjem ogrevanju. Uporabe vključujejo:
- topljenje snega;
- ogrevanje tal;
- preprečevanje širjenja zmrzali;
- podzemne sisteme shranjevanja termalne energije;
- vratne okvirje.
d) Namestitve s sledenjem ogrevanju znotraj napeljave cevi. Uporabe vključujejo:
- topljenje snega - v napeljavi;
- ogrevanje tal – v napeljavi;
- preprečevanje širjenja zmrzali – v napeljavi;
- podzemni sistemi shranjevanja termalne energije – v napeljavi;
- notranje sledenje ogrevanju cevi za pitno vodo;
- zaprte drenažne cevi in prepusti.

General Information

Status
Withdrawn
Publication Date
22-Nov-2010
Withdrawal Date
07-Nov-2016
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
08-Nov-2016
Due Date
01-Dec-2016
Completion Date
08-Nov-2016

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Standards Content (sample)

SLOVENSKI STANDARD
SIST-TS CLC/TS 62395-2:2011
01-januar-2011

,QGXVWULMVNLLQNRPHUFLDOQLVLVWHPLHOHNWULþQLKXSRURYQLKJUHOQLKWUDNRYGHO

9RGLOR]DQDþUWRYDQMHVLVWHPDQDPHVWLWHYLQY]GUåHYDQMH ,(&76

Electrical resistance trace heating systems for industrial and commercial applications -

Part 2: Application guide for system design, installation and maintenance (IEC/TS 62395-

2:2008)
Elektrische Begleitheizungen (Trace- Widerstandsheizungen) für industrielle und

gewerbliche Zwecke - Teil 2: Anwendungsleitfaden für Systementwurf, Installation und

Wartung (IEC/TS 62395-2:2008)
Systèmes de traçage par résistance électrique pour applications industrielles et

commerciales - Partie 2: Guide d'application pour la conception, l'installation et la

maintenance du système (CEI/TS 62395-2:2008)
Ta slovenski standard je istoveten z: CLC/TS 62395-2:2010
ICS:
25.180.10 (OHNWULþQHSHþL Electric furnaces
SIST-TS CLC/TS 62395-2:2011 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST-TS CLC/TS 62395-2:2011
---------------------- Page: 2 ----------------------
SIST-TS CLC/TS 62395-2:2011
TECHNICAL SPECIFICATION
CLC/TS 62395-2
SPÉCIFICATION TECHNIQUE
November 2010
TECHNISCHE SPEZIFIKATION
ICS 25.180.10
English version
Electrical resistance trace heating systems for industrial and commercial
applications -
Part 2: Application guide for system design, installation and maintenance
(IEC/TS 62395-2:2008)
Systèmes de traçage par résistance Elektrische Begleitheizungen (Trace-

électrique pour applications industrielles et Widerstandsheizungen) für industrielle

commerciales - und gewerbliche Zwecke -
Partie 2: Guide d'application pour la Teil 2: Anwendungsleitfaden für

conception, l'installation et la maintenance Systementwurf, Installation und Wartung

du système (IEC/TS 62395-2:2008)
(CEI/TS 62395-2:2008)
This Technical Specification was approved by CENELEC on 2010-10-25.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to

make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting

national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia,

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.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. CLC/TS 62395-2:2010 E
---------------------- Page: 3 ----------------------
SIST-TS CLC/TS 62395-2:2011
CLC/TS 62395-2:2010 - 2 -
Foreword

This Technical Specification consists of the text of the Technical Specification IEC/TS 62395-2:2008

prepared by IEC TC 27, Industrial electroheating.

It was circulated for voting in accordance with the Internal Regulations, Part 2, Subclause 11.3.3.3 and was

accepted as a CENELEC Technical Specification on 2010-10-25.
The following date was fixed:
– latest date by which the existence of the CLC/TS
has to be announced at national level (doa) 2011-04-25
Annex ZA has been added by CENELEC.
__________
---------------------- Page: 4 ----------------------
SIST-TS CLC/TS 62395-2:2011
- 3 - CLC/TS 62395-2:2010
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 60050-841 - International Electrotechnical Vocabulary (IEV) - - -
Part 841: Industrial electroheat
IEC 60519-1 - Safety in electroheat installations - EN 60519-1 -
Part 1: General requirements
IEC 62395-1 2006 Electrical resistance trace heating systems for EN 62395-1 2006
industrial and commercial applications -
Part 1: General and testing requirements
---------------------- Page: 5 ----------------------
SIST-TS CLC/TS 62395-2:2011
---------------------- Page: 6 ----------------------
SIST-TS CLC/TS 62395-2:2011
IEC/TS 62395-2
Edition 1.0 2008-06
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Electrical resistance trace heating systems for industrial and commercial
applications –
Part 2: Application guide for system design, installation and maintenance
Systèmes de traçage par résistance électrique pour applications industrielles et
commerciales –

Partie 2: Guide d’application pour la conception, l’installation et la maintenance

du système
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 25.180.10 ISBN 2-8318-9776-9
---------------------- Page: 7 ----------------------
SIST-TS CLC/TS 62395-2:2011
– 2 – TS 62395-2 © IEC:2008
CONTENTS

FOREWORD...........................................................................................................................7

INTRODUCTION.....................................................................................................................9

1 Scope and object............................................................................................................10

2 Normative references .....................................................................................................11

3 Terms and definitions .....................................................................................................11

4 Surface heating of vessels and piping systems...............................................................11

4.1 Application description ..........................................................................................11

4.1.1 General .....................................................................................................11

4.1.2 Environmental conditions...........................................................................11

4.1.3 Trace heating systems considerations .......................................................12

4.2 Design information – General ................................................................................12

4.2.1 General .....................................................................................................12

4.2.2 Electrical system design ............................................................................12

4.2.3 Control and monitoring ..............................................................................12

4.2.4 Trace heating system design .....................................................................13

4.2.5 Design information documentation.............................................................14

4.3 Thermal system design..........................................................................................14

4.3.1 General .....................................................................................................14

4.3.2 Design conditions ......................................................................................14

4.3.3 Thermal insulation .....................................................................................15

4.3.4 Heat loss determination .............................................................................20

4.3.5 Design safety factor...................................................................................21

4.3.6 Heat-up considerations..............................................................................21

4.3.7 Selection of trace heater............................................................................22

4.3.8 Design calculations ...................................................................................25

4.3.9 Theoretical sheath temperature calculations – Metallic pipe

applications ...............................................................................................25

4.3.10 Theoretical sheath temperature calculations – Non-metallic pipe

applications ...............................................................................................26

4.3.11 Design documentation ...............................................................................27

4.3.12 Start-up at low ambient temperatures ........................................................28

4.3.13 Long trace heater circuits ..........................................................................28

4.3.14 Chimney effect ..........................................................................................28

4.4 Electrical design....................................................................................................29

4.5 Control and monitoring system design ...................................................................29

4.5.1 General .....................................................................................................29

4.5.2 Mechanical controllers...............................................................................29

4.5.3 Electronic controllers .................................................................................30

4.5.4 Application suitability.................................................................................30

4.5.5 Location of controllers ...............................................................................31

4.5.6 Location of sensors ...................................................................................31

4.5.7 Alarm considerations .................................................................................32

4.5.8 Integrated control ......................................................................................33

4.5.9 Flow pattern analysis.................................................................................33

4.5.10 Dead-leg control technique ........................................................................35

4.6 Special design considerations ...............................................................................35

4.6.1 General .....................................................................................................35

---------------------- Page: 8 ----------------------
SIST-TS CLC/TS 62395-2:2011
TS 62395-2 © IEC:2008 – 3 –

4.6.2 Freeze protection systems.........................................................................35

4.6.3 Sprinkler systems, fire suppression ...........................................................36

4.6.4 Hot water services/tempered water............................................................36

4.6.5 Specialty lines ...........................................................................................37

4.7 Installation ............................................................................................................39

4.7.1 General .....................................................................................................39

4.7.2 Personnel aspects .....................................................................................39

4.7.3 Preparatory work .......................................................................................40

4.7.4 Preliminary installation of trace heating circuits .........................................40

4.7.5 Insulation resistance test ...........................................................................40

4.7.6 Installation of trace heater systems ...........................................................41

4.7.7 Installation of control and monitoring equipment ........................................43

4.7.8 Necessary modifications............................................................................44

4.7.9 Installation of the thermal insulation system ..............................................44

4.7.10 Installation of electrical power ...................................................................46

4.7.11 Commissioning ..........................................................................................46

4.8 Maintenance..........................................................................................................47

4.8.1 General .....................................................................................................47

4.8.2 Training of maintenance personnel ............................................................47

4.8.3 Frequency of inspection.............................................................................48

4.8.4 Maintenance program documentation ........................................................48

4.8.5 Visual evaluation .......................................................................................48

4.8.6 Electrical evaluation ..................................................................................48

4.8.7 Review of the electrical protection system .................................................49

4.9 Repair ...................................................................................................................49

4.9.1 General .....................................................................................................49

4.9.2 Fault location.............................................................................................49

4.9.3 Practicability of repair to electric trace heaters ..........................................49

4.9.4 Repair techniques for electrical trace heaters ............................................50

5 Roof and gutter de-icing .................................................................................................50

5.1 Application description ..........................................................................................50

5.2 Design information – General ................................................................................51

5.3 Thermal design .....................................................................................................52

5.4 Electrical design....................................................................................................52

5.5 Control and monitoring system design ...................................................................52

5.6 Special design considerations ...............................................................................53

5.7 Installation ............................................................................................................53

5.7.1 General .....................................................................................................53

5.7.2 Trace heaters and component mounting ....................................................53

5.8 Maintenance..........................................................................................................56

5.9 Repair ...................................................................................................................56

6 Rail heating ....................................................................................................................57

6.1 Application description ..........................................................................................57

6.1.1 Point heating .............................................................................................57

6.1.2 Contact/live rail heating .............................................................................57

6.1.3 Track heating ............................................................................................57

6.1.4 Catenary/pantograph shoe heating ............................................................57

6.2 Design information ................................................................................................58

6.2.1 General .....................................................................................................58

---------------------- Page: 9 ----------------------
SIST-TS CLC/TS 62395-2:2011
– 4 – TS 62395-2 © IEC:2008

6.2.2 Weather data.............................................................................................58

6.2.3 Surface description....................................................................................58

6.2.4 System design...........................................................................................58

6.2.5 Performance level classification.................................................................58

6.3 Thermal design .....................................................................................................58

6.3.1 General .....................................................................................................58

6.3.2 Typical heating load ..................................................................................59

6.4 Electrical design....................................................................................................59

6.5 Control and monitoring system design ...................................................................59

6.6 Special design considerations ...............................................................................60

6.6.1 Electrical considerations............................................................................60

6.6.2 Finite element analysis ..............................................................................60

6.7 Installation ............................................................................................................60

6.8 Maintenance..........................................................................................................63

6.9 Repair ...................................................................................................................63

7 Snow melting..................................................................................................................63

7.1 Application description ..........................................................................................63

7.2 Design information ................................................................................................64

7.2.1 General .....................................................................................................64

7.2.2 Weather data.............................................................................................64

7.2.3 Construction details of workpiece ..............................................................64

7.2.4 Electrical considerations............................................................................64

7.2.5 System performance level .........................................................................64

7.2.6 Trace heater layout and component mounting ...........................................65

7.3 Thermal design – Power output (heat load) determination .....................................69

7.4 Electrical design....................................................................................................69

7.5 Control and monitoring system design ...................................................................69

7.6 Special design considerations ...............................................................................69

7.7 Installation ............................................................................................................70

7.8 Maintenance..........................................................................................................70

7.9 Repair ...................................................................................................................71

8 Floor warming ................................................................................................................71

8.1 Application description ..........................................................................................71

8.2 Design information ................................................................................................71

8.2.1 General .....................................................................................................71

8.2.2 Environmental data....................................................................................71

8.2.3 Construction details of workpiece ..............................................................71

8.2.4 Electrical considerations............................................................................71

8.2.5 Trace heater layout and component mounting ...........................................72

8.3 Thermal design – Heat load determination.............................................................73

8.4 Electrical design....................................................................................................74

8.5 Control and monitoring system design ...................................................................74

8.6 Special design consideration .................................................................................74

8.7 Installation ............................................................................................................74

8.8 Maintenance..........................................................................................................75

8.9 Repair ...................................................................................................................75

9 Frost heave prevention...................................................................................................75

9.1 Application description ..........................................................................................75

9.2 Design information ................................................................................................76

---------------------- Page: 10 ----------------------
SIST-TS CLC/TS 62395-2:2011
TS 62395-2 © IEC:2008 – 5 –

9.2.1 General .....................................................................................................76

9.2.2 Construction details of the floor .................................................................76

9.2.3 Electrical considerations............................................................................76

9.3 Heat load determination ........................................................................................76

9.3.1 General .....................................................................................................76

9.3.2 Trace heater layout and component mounting ...........................................77

9.4 Electrical design....................................................................................................78

9.5 Control and monitoring system design ...................................................................78

9.5.1 Control options ..........................................................................................78

9.5.2 Monitoring .................................................................................................78

9.6 Special design considerations ...............................................................................78

9.7 Installation ............................................................................................................79

9.8 Maintenance..........................................................................................................79

9.9 Repair ...................................................................................................................79

10 Underground thermal energy storage systems................................................................79

10.1 Application description ..........................................................................................79

10.2 Design information ................................................................................................79

10.2.1 General .....................................................................................................79

10.2.2 Environmental data....................................................................................80

10.2.3 Construction details of building..................................................................80

10.2.4 Electrical considerations............................................................................80

10.2.5 Trace heater layout and component mounting ...........................................80

10.3 Thermal design – Heat-loss determination.............................................................81

10.4 Electrical design....................................................................................................81

10.5 Control and monitoring system design ...................................................................82

10.6 Special design considerations when trace heaters are located in sand layer .........82

10.7 Installation ............................................................................................................82

10.7.1 General .....................................................................................................82

10.7.2 Installation in sand ....................................................................................82

10.7.3 Installation in concrete...............................................................................82

10.8 Maintenance..........................................................................................................83

10.9 Repair ...................................................................................................................83

Annex A (informative) Pre-installation checks ......................................................................84

Annex B (informative) Trace heater commissioning record...................................................85

Annex C (informative) Maintenance schedule and log record ...............................................86

Bibliography..........................................................................................................................87

Figure 1 – Thermal insulation – Weather-barrier installation..................................................17

Figure 2 – Typical temperature profile...................................................................................19

Figure 3 – Equilibrium conditions for workpiece maintenance................................................24

Figure 4 – Equilibrium conditions for upper limit evaluation...................................................24

Figure 5 – Heated tank example ...........................................................................................34

Figure 6 – Bypass example...................................................................................................35

Figure 7 – Double containment system .................................................................................38

Figure 8 – Gravity flow piping systems..................................................................................39

Figure 9 – Ice dam formation ................................................................................................51

Figure 10 – Downspout to underground drain........................................................................52

---------------------- Page: 11 ----------------------
SIST-TS CLC/TS 62395-2:2011
– 6 – TS 62395-2 © IEC:2008

Figure 11 – Roof and gutter trace heater arrangement..........................................................54

Figure 12 – Gutter detail .......................................................................................................54

Figure 13 – Typical roof mounting methods...........................................................................55

Figure 14 – Drain detail for flat roof ......................................................................................56

Figure 15 – Typical positioning of point trace heater on stock rail and switch rail ..................61

Figure 16 – Typical positioning of trace heater on swing nose crossing.................................61

Figure 17 – Typical clamp lock trace heater ..........................................................................62

Figure 18 – Typical positioning of trace heater on steel and aluminium clad contact

rails ......................................................................................................................................62

Figure 19 – Typical positioning of trace heater in pantograph shoe .......................................63

Figure 20 – Snow melting trace heater embedded in concrete ..............................................66

Figure 21 – Snow melting trace heater located in conduit .....................................................67

Figure 22 – Expansion joint detail .........................................................................................68

Figure 23 – Snow melting junction box location.....................................................................68

Figure 24 – Typical floor warming trace heat
...

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