EN ISO 13577-2:2023

Industrial furnaces and associated processing equipment - Safety - Part 2: Combustion and fuel handling systems (ISO 13577-2:2023)

This document specifies the safety requirements for combustion and fuel handling systems that are part of industrial furnaces and associated processing equipment (TPE), including single and multiple burner systems in thermoprocessing equipment and machines.
NOTE            The general safety requirements common to TPE are provided in ISO 13577-1:2016. ISO 13577-1:2016, Annex B also includes a list of processes for which industrial furnaces and heating systems covered by the ISO 13577 series are used.
This document deals with significant hazards, hazardous situations and events relevant to combustion and fuel handling systems as listed in Annex A, when used as intended and under the conditions for use as described in the instruction handbook.
This document covers:
—     fuel pipework downstream of and including the manual isolating valve;
—     combustion air supply (including oxygen and oxygen enriched combustion air) and flue gas system;
—     burner(s), burner system and ignition device;
—     functional requirements for safety related control system.
This document applies to any oxidation of gaseous and liquid fuels with air or other gases containing free oxygen to release thermal energy in TPE. Annex B includes examples of gaseous and liquid fuels.
For thermal or catalytic post combustion and waste incineration, this document applies only to auxiliary burners designed to start-up and/or support the process.
The pressure hazard of the piping and components covered by this document is within the maximum pressure/size relationship of category I as specified in Annex C.
This document also gives the necessary requirements regarding information for use.
This document does not cover hazards from heating generated by electricity.
This document does not deal with the hazards created by the release of flammable substances from the products processed in the TPE.
This document is not applicable to combustion and fuel handling systems:
—     of gas welding and allied processes;
—     up-stream of the TPE manual isolating valve.
This document is not applicable to industrial furnaces and associated processing equipment (TPE), including single and multiple burner systems in thermoprocessing equipment and machines manufactured before the date of its publication.
This document is not applicable to blast furnaces, converters (in steel plants), boilers, fired heaters (including reformer furnaces) in the petrochemical and chemical industries.
This document is not applicable to electrical cabling and power cabling upstream of the TPE control panel/protective system.

Industrielle Thermoprozessanlagen und dazugehörige Prozesskomponenten - Sicherheitsanforderungen - Teil 2: Feuerungen und Brennstoffführungssysteme (ISO 13577-2:2023)

Dieses Dokument legt die Sicherheitsanforderungen für Verbrennungs- und Brennstoffführungssysteme fest, die Teil von Industrieöfen und zugehörigen Prozessanlagen (TPE) sind, einschließlich Einzel- und Mehrbrennersysteme in Thermoprozessanlagen und -maschinen.
ANMERKUNG   Die allgemeinen Sicherheitsanforderungen für TPE sind in ISO 13577 1:2016 enthalten. ISO 13577 1:2016, Anhang B, enthält auch eine Liste von Prozessen für die Industrieöfen und Heizsysteme, die unter die ISO 13577 Reihe fallen, verwendet werden.
Dieses Dokument befasst sich mit signifikanten Gefahren, gefährlichen Situationen und Ereignissen, die für die in Anhang A aufgeführten Verbrennungs- und Brennstoffführungssysteme relevant sind, wenn sie bestimmungsgemäß und unter den in der Betriebsanleitung beschriebenen Einsatzbedingungen verwendet werden.
Dieses Dokument gilt für:
   Brennstoffleitungssysteme in Strömungsrichtung beginnend mit dem handbetätigten Hauptabsperrventil einschließlich dieses Ventils;
   Verbrennungsluftzufuhr (einschließlich Sauerstoff und sauerstoffangereicherter Verbrennungsluft) und Abgassystem;
   Brenner, Brennersysteme und Zündvorrichtungen;
   Funktionsanforderungen an sicherheitsrelevante Steuerungssysteme.
Dieses Dokument gilt für jede Oxidation oder Verbrennung von gasförmigen und flüssigen Brennstoffen mit Luft oder anderen Gasen, die freien Sauerstoff enthalten, um thermische Energie in TPE freizusetzen. Anhang B enthält Beispiele für gasförmige und flüssige Brennstoffe.
Bei thermischen oder katalytischen Nachverbrennungsanlagen und Müllverbrennungen gilt dieses Dokument nur für Hilfsbrenner, die für die Inbetriebnahme und/oder Unterstützung des Prozesses ausgelegt sind.
Die Druckgefährdung der in diesem Dokument behandelten Rohrleitungen und Bauteile liegt innerhalb des maximalen Druck-/Größenverhältnisses der Kategorie I, wie in Anhang C angegeben.
In diesem Dokument werden auch die notwendigen Anforderungen an die Informationen zur Verwendung festgelegt.
Dieses Dokument befasst sich nicht mit den Gefahren, die von elektrischen Heizsystemen ausgehen.
Dieses Dokument befasst sich nicht mit den Gefahren, die durch die Freisetzung von brennbaren Stoffen aus den im TPE verarbeiteten Produkten entstehen.
Dieses Dokument ist nicht anwendbar auf Verbrennungs- und Brennstoffführungssysteme:
   des Gasschweißens und verwandter Verfahren;
   stromaufwärts des handbetätigten Absperrventils TPE.
Dieses Dokument ist nicht anwendbar auf Industrieöfen und zugehörige Prozessanlagen (TPE), einschließlich Einzel- und Mehrbrennersystemen in Thermoprozessanlagen und -maschinen, die vor dem Datum seiner Veröffentlichung hergestellt wurden.
Dieses Dokument ist nicht anwendbar für Hochöfen, Konverter (in Stahlwerken), Kessel, befeuerte Erhitzer (einschließlich Reformeröfen) in der petrochemischen und chemischen Industrie.
Dieses Dokument ist nicht anwendbar für die elektrische Verkabelung und die Leistungsverkabelung vor dem TPE-Schaltschrank/Schutzsystem.

Fours industriels et équipements associés - Sécurité - Partie 2: Équipement de combustion et de manutention des combustibles (ISO 13577-2:2023)

Le présent document spécifie les prescriptions de sécurité relatives aux équipements de combustion et de manutention des combustibles qui font partie des fours industriels et des équipements associés (TPE), y compris les systèmes de brûleurs simples et multiples dans les équipements et machines thermiques.
NOTE            Les prescriptions générales de sécurité communes aux TPE sont listées dans l'ISO 13577-1:2016. L'ISO 13577-1:2016, Annexe B comprend également une liste de procédés pour lesquels les fours industriels et les systèmes de chauffage couverts par la série ISO 13577 sont utilisés.
Le présent document traite des phénomènes dangereux, situations dangereuses et événements dangereux significatifs qui sont pertinents pour les équipements de combustion et de manutention des combustibles, tels qu'énumérés à l'Annexe A, lorsqu'ils sont utilisés normalement et dans les conditions d'utilisation décrites dans la notice d'instructions.
Le présent document couvre:
—     la tuyauterie de combustible en aval du robinet de barrage à commande manuelle et y compris celui-ci;
—     l'alimentation en air de combustion (y compris l'oxygène et l'air de combustion enrichi en oxygène) et le système d'évacuation des gaz de combustion;
—     le(s) brûleur(s), le système de brûleur(s) et le dispositif d'allumage;
—     les prescriptions fonctionnelles pour un système de commande relatif à la sécurité.
Le présent document s'applique à tout phénomène d'oxydation des combustibles gazeux et liquides avec l'air ou d'autres gaz contenant de l'oxygène libre de manière à dégager de la chaleur dans le TPE. L'Annexe B comprend des exemples de combustibles gazeux et liquides.
En ce qui concerne la post-combustion thermique ou catalytique et l'incinération des déchets, le présent document s'applique uniquement aux brûleurs auxiliaires conçus pour démarrer et/ou soutenir le procédé.
Le phénomène dangereux engendré par la pression dans la tuyauterie et les composants couverts par le présent document correspond à la relation pression maximale/dimensions de catégorie I spécifiée dans l'Annexe C.
Le présent document donne également les prescriptions nécessaires concernant les informations pour l'utilisation.
Le présent document ne couvre pas les phénomènes dangereux liés à la chaleur électrique.
Le présent document ne traite pas des phénomènes dangereux engendrés par le dégagement de substances inflammables par les produits traités dans le TPE.
Le présent document ne s'applique pas aux équipements de combustion et de manutention des combustibles:
—     pour le soudage au gaz et les procédés connexes;
—     en amont du robinet de barrage à commande manuelle du TPE.
Le présent document ne s’applique pas aux fours industriels et équipements de traitement associés (TPE), y compris les systèmes à brûleurs simples et multiples dans l’équipement et les machines de traitement de chaleur fabriqués avant sa date de publication.
Le présent document n'est pas applicable aux hauts-fourneaux, aux convertisseurs (des aciéries), aux chaudières, aux appareils de chauffage (y compris les fours de reformage) dans les industries pétrochimiques et chimiques.
Le présent document ne s'applique pas aux câblages électriques et d'alimentation en amont du tableau de commande/du système de protection du TPE.

Industrijske peči in pripadajoča procesna oprema - Varnost - 2. del: Sistemi zgorevanja in ravnanja z gorivom (ISO 13577-2:2023)

Ta del standarda ISO 13577 določa varnostne zahteve za sisteme zgorevanja in ravnanja z gorivom, ki so del industrijskih peči in pripadajoče procesne opreme.
OPOMBA: Splošne varnostne zahteve, ki so skupne za pripadajočo procesno opremo, so navedene v standardu ISO 13577-1 (glej Uvod), dodatek B standarda ISO 13577-1 pa vsebuje tudi seznam procesov, ki jih lahko uporabljajo industrijske peči in sistemi ogrevanja, zajeti v standardu ISO 13577.
Ta del standarda ISO 13577 obravnava najpomembnejše nevarnosti, nevarne situacije in dogodke, povezane s sistemi zgorevanja in ravnanja z gorivom, kot so navedeni v dodatku E, če se uporabljajo v skladu s predvidenim namenom in pod pogoji, ki jih je predvidel proizvajalec.
Ta del standarda ISO 13577 zajema:
– cevovod za gorivo za ročnim zapornim ventilom in vključno z njim;
– sistema dovoda zgorevalnega zraka (vključno s kisikom in zgorevalnim zrakom, obogatenim s kisikom) in dimnih plinov;
– gorilnik(e), sistem gorilnikov in vžigalno napravo;
– funkcionalne zahteve za varnostni nadzorni sistem.
Ta del standarda ISO 13577 se uporablja za vsakršno oksidacijo z zrakom ali drugimi plini, ki vsebujejo prosti kisik plinskih ali tekočih goriv, ali za njihovo zgorevanje za sproščanje toplotne energije v pripadajoči procesni opremi.
Za toplotno ali katalitično naknadno zgorevanje in sežig odpadkov se ta del standarda ISO 13577 uporablja tudi za pomožne gorilnike, ki so zasnovani za začetek in/ali podporo procesu.
Nevarnost tlaka v ceveh in komponentah, ki jih zajema ta del standarda ISO 13577, je znotraj razmerja največjega tlaka/velikosti kategorije I, kot je opisano v normativen dodatku A.
Ta del standarda ISO 13577 prav tako določa potrebne zahteve v zvezi z informacijami za uporabo.
Ta del standarda ISO 13577 ne zajema nevarnosti zaradi toplote, ki jo ustvarja elektrika.
Ta del standarda ISO 13577 ne obravnava nevarnosti, ki so rezultat sproščanja vnetljivih snovi iz produktov, obdelanih v pripadajoči procesni opremi.
Ta del standarda ISO 13577 se ne uporablja za sisteme zgorevanja in ravnanja z gorivom:
– plinskega varjenja in podobne postopke
– pred ročnim zapornim ventilom pripadajoče procesne opreme.
Ta del standarda ISO 13577 se ne uporablja za plavže, pretvornike (v jeklarnah), kotle, segrete gorilnike (vključno z reformacijskimi pečmi) v petrokemični in kemični industriji.
Ta del standarda ISO 13577 se ne uporablja za električne kable in napajalne kable pred nadzorno ploščo/zaščitnim sistemom pripadajoče procesne opreme.
Ta dokument se ne uporablja za sisteme zgorevanja in ravnanja z gorivom, ki so izdelani pred datumom njegove objave.

General Information

• Status: Published
• Publication Date: 19-Dec-2023
• ICS: 13.100 - Occupational safety. Industrial hygiene
• ICS: 25.180.01 - Industrial furnaces in general
• Technical Committee: CEN/TC 186 - Industrial thermoprocessing - Safety
• Drafting Committee: CEN/TC 186/WG 2 - Combustion and fuel handling systems - Safety requirements
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 20-Dec-2023
• Due Date: 10-Dec-2023
• Completion Date: 20-Dec-2023
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: SIST EN ISO 13577-2:2024 - Industrial furnaces and associated processing equipment - Safety - Part 2: Combustion and fuel handling systems (ISO 13577-2:2023)

Relations

• Replaces: EN 746-2:2010 - Industrial thermoprocessing equipment - Part 2: Safety requirements for combustion and fuel handling systems
• Effective Date: 19-Jan-2023

Overview

EN ISO 13577-2:2023 (ISO 13577-2:2023) specifies safety requirements for combustion and fuel handling systems that are part of industrial furnaces and associated processing equipment (TPE). It targets single and multiple burner systems in thermoprocessing equipment and machines, covering fuel pipework downstream of the manual isolating valve, combustion air and flue gas systems (including oxygen and oxygen‑enriched air), burners and ignition devices, and safety‑related control system requirements. The standard addresses significant hazards listed in Annex A, gives fuel examples in Annex B and limits piping pressure hazards to category I (Annex C). It does not cover electrical heating, hazards from processed product emissions, upstream supply piping before the isolating valve, gas welding, older equipment manufactured before publication, major steel or petrochemical furnaces/boilers, or power cabling upstream of the TPE control panel.

Key Topics and Technical Requirements

The document provides detailed prescriptive and functional measures including (excerpted from main clauses):

• Fuel pipework: connections, flexible tubing, marking, soundness/tightness, condensate drains, purge points, blow‑off/breather conduits and bypass arrangements.
• Gaseous fuel safety devices: manual isolating valves, filters/strainers, pressure regulators, low/high pressure protection, automatic shut‑off valves, valve proving, flame arrestors.
• Liquid fuel requirements: isolation valves, filters, pressure relief and regulation, temperature protection, shut‑off valves for multiple burners.
• Combustion air and fuel/air ratio: air supply systems, oxygen/enriched air considerations, air/flow and pressure sensing, mixture pipework for pre‑mixed gases.
• Burners and ignition: main burners, radiant tube burners, ignition/pilot arrangements, permanent pilots, burner capacity control, flue gas venting, purging of residual fuel.
• Automatic burner control systems: functional safety, flame supervision, controls for low‑ and high‑temperature equipment, start‑up and pre‑purging procedures.
• Information for use: required documentation and instructions to ensure safe operation and maintenance.

Practical Applications and Who Uses This Standard

ISO 13577-2 is essential for professionals involved in the design, manufacture, installation, commissioning, operation and maintenance of thermoprocessing equipment that use gaseous or liquid fuels. Typical users include:

• Furnace and burner manufacturers (OEMs)
• Plant and process safety engineers
• Maintenance and commissioning teams
• Heating system integrators and control-system designers
• Regulatory bodies and conformity assessment organizations

Use cases: heat‑treatment furnaces, industrial ovens and kilns, thermoprocessing lines where safe fuel handling, combustion control, flame supervision and purge/start‑up procedures are required.

Related Standards

• ISO 13577-1:2016 - General safety requirements for TPE (referenced for common safety principles).
• EN ISO 13577-2:2023 - CEN adoption of the ISO text (standardized across EU members).
• Supersedes EN 746-2:2010 for combustion/fuel handling aspects.

Keywords: Industrial furnaces, combustion systems, fuel handling systems, safety requirements, ISO 13577-2, EN ISO 13577-2:2023, thermoprocessing equipment, burner safety, fuel pipework.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2024
Industrijske peči in pripadajoča procesna oprema - Varnost - 2. del: Sistemi
zgorevanja in ravnanja z gorivom (ISO 13577-2:2023)
Industrial furnaces and associated processing equipment - Safety - Part 2: Combustion
and fuel handling systems (ISO 13577-2:2023)
Industrielle Thermoprozessanlagen und dazugehörige Prozesskomponenten -
Sicherheitsanforderungen - Teil 2: Feuerungen und Brennstoffführungssysteme (ISO
13577-2:2023)
Fours industriels et équipements associés - Sécurité - Partie 2: Équipement de
combustion et de manutention des combustibles (ISO 13577-2:2023)
Ta slovenski standard je istoveten z: EN ISO 13577-2:2023
ICS:
25.180.01 Industrijske peči na splošno Industrial furnaces in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13577-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 13.100; 25.180.01 Supersedes EN 746-2:2010
English Version
Industrial furnaces and associated processing equipment -
Safety - Part 2: Combustion and fuel handling systems (ISO
13577-2:2023)
Fours industriels et équipements associés - Sécurité - Industrielle Thermoprozessanlagen und dazugehörige
Partie 2: Équipement de combustion et de manutention Prozesskomponenten - Sicherheitsanforderungen - Teil
des combustibles (ISO 13577-2:2023) 2: Feuerungen und Brennstoffführungssysteme (ISO
13577-2:2023)
This European Standard was approved by CEN on 10 June 2023.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13577-2:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 13577-2:2023) has been prepared by Technical Committee ISO/TC 244
"Industrial furnaces and associated processing equipment" in collaboration with Technical Committee
CEN/TC 186 “Industrial thermoprocessing - Safety” the secretariat of which is held by DIN.
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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 746-2:2010.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 13577-2:2023 has been approved by CEN as EN ISO 13577-2:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 13577-2
Second edition
2023-12
Industrial furnaces and associated
processing equipment — Safety —
Part 2:
Combustion and fuel handling systems
Fours industriels et équipements associés — Sécurité —
Partie 2: Équipement de combustion et de manutention des
combustibles
Reference number
ISO 13577-2:2023(E)
ISO 13577-2:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 13577-2:2023(E)
Contents Page
Foreword . vi
Introduction .vii
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 2
3 Terms and definitions . 4
4 Safety requirements, measures and verification means . 4
4.1 General . 4
4.1.1 Safety objectives and basic requirements . 4
4 .1. 2 O ver-t emp er at u r e pr ot e c t ion . 5
4.1.3 Accumulation of hazardous fluids . 6
4 .1.4 S ei s m ic pr ot e c t ion . 6
4.1.5 R egional requirements . 6
4 . 2 F uel pip ework . 6
4.2.1 General . 6
4 . 2 . 2 C on ne c t ion s . 6
4 . 2 . 3 Unc on ne c t e d pip ewor k . 8
4.2.4 G alvanic cells . 8
4.2.5 F lexible tubing and couplings . 8
4 . 2 . 6 M a rk i n g . . . 8
4 . 2 .7 S ou nd ne s s/t i g ht ne s s . 8
4.2.8 C ondensate drains on gas pipework . 10
4.2.9 F uel pipe heating . 10
4 . 2 .10 P u r g e p oi nt s . 10
4.2.11 Pressure relief devices . 10
4.2.12 Blow-off and breather pipes or conduits . 10
4.2.13 Equipment supplied with different fuels . 11
4.2.14 B ypass . 11
4.2.15 Isolation of required safety devices . 11
4.3 R equired safety devices for gaseous fuels . 11
4.3.1 Manual isolating valve . 11
4 . 3 . 2 F i l t er/s t r a i ner . 11
4.3.3 Gas pressure regulator .12
4.3.4 L ow gas pressure protection .12
4.3.5 High gas pressure protection . 13
4.3.6 Automatic shut-off valves . 13
4 . 3 .7 Va l ve pr ov i n g . 14
4.3.8 Individual manual shut-off valves for burners . 15
4 . 3 .9 F l a me a r r e s t or . 15
4.4 G as pressure boosters . .15
4.5 R equired safety devices for liquid fuels . 16
4.5.1 Manual isolating valve . 16
4 . 5 . 2 F i l t er/s t r a i ner . 16
4.5.3 Pressure relief valve. 16
4.5.4 Liquid fuel pressure regulator . 16
4.5.5 Pressure regulation of auxiliary fluids . 16
4.5.6 Liquid fuel and auxiliary fluid pressure protection . 16
4.5.7 Liquid fuel temperature protection . 16
4.5.8 Automatic shut-off valves . 17
4.5.9 Automatic shut-off valves for multiple burners . 17
4.5.10 Individual manual shut-off valves for multiple burners . 17
4.6 C ombustion air and fuel/air ratio . 18
4.6.1 Combustion air system . 18
4.6.2 A ir flow and pressure sensing devices . 18
iii
ISO 13577-2:2023(E)
4 . 6 . 3 A i r/f uel r at io . 19
4.7 S upply of pre-mixed fuel gas/air . 19
4.7.1 M ixture pipework . 19
4.7.2 A ir and gas supply to the mixture circuit . 19
4.8 L iquid fuel atomisation .20
4 .9 B u r ner s . 20
4 .9.1 M a i n bu r ner s.20
4.9.2 Radiant tube burner systems . 20
4.9.3 Ignition device/pilot burner . 20
4 .9.4 P er m a nent pi lot s . 21
4.9.5 Burner capacity control . 21
4.9.6 Flue gas venting . . . 21
4.9.7 P urge of residual fuel . 21
4.10 A utomatic burner control systems . 21
4.10.1 G eneral . 21
4.10.2 Low-temperature equipment . 22
4.10.3 H igh-temperature equipment . 22
4.10.4 Automatic burner control systems for burners operating in the open air .23
4.10.5 Flame supervision for line-burners . . 23
4.11 S tart-up of the heating system and burner ignition . 23
4.11.1 P re-purging of the combustion chamber . 23
4.11.2 Start-up of the fuel supply . 25
4.11.3 Start fuel flow rate .25
4 .11.4 Ig n it ion . 25
4.11.5 M aximum safety times for gas-fired natural draught burners .25
4.11.6 M aximum safety times for forced and induced draught gas-fired burners .26
4.11.7 M aximum safety times for liquid fuel fired burners . 27
4.11.8 Flame failure on start-up .28
4.11.9 Flame failure during operation .28
4 .12 Mu lt iple f uel s . .29
4.12.1 General .29
4 .12 . 2 F uel c i r c u it .29
4.12.3 Combustion air supplies .29
4.12.4 Operation of the safety devices .29
4 .12 . 5 A i r/f uel r at io .29
4.13 O xygen or oxygen-enriched combustion air (OOECA) .29
4.13.1 General .29
4.13.2 Suitability for oxygen service .30
4 .13 . 3 P ip ework . 30
4 .13 .4 F low velo c it ie s .30
4.13.5 Connection for oxygen pipework . 31
4.13.6 Sealing materials for oxygen pipework . . 31
4 .13 .7 F it t i n g s . 31
4.13.8 Blow off and venting lines . 31
4.13.9 Flexible tubing and couplings . 31
4.13.10 S afety devices against backflow . 31
4.13.11 Material requirements . 31
5 Verification of the safety requirements and/or measures .32
Information for use .36
6.1 General .36
6 . 2 M a rk i n g . 36
6 . 3 I n s t r uc t ion h a ndb o ok. 36
6.3.1 G eneral .36
6.3.2 Description of equipment .36
6 . 3 . 3 I n s p e c t ion pr o c e du r e s . 37
6.3.4 Commissioning, start-up and operating procedures . 37
iv
ISO 13577-2:2023(E)
6 . 3 . 5 S hut dow n pr o c e du r e s . 37
6 . 3 . 6 M a i nt en a nc e pr o c e du r e s.38
6 . 3 .7 D o c u ment at ion.38
Annex A (informative) List of significant hazards .39
Annex B (informative) Examples of fuels .41
Annex C (normative) Maximum allowed pressure .42
Annex D (informative) Examples for the determination of safety integrity level (SIL) or
performance level (PL) using the risk graph method .47
Annex E (normative) Regional product standards .58
Annex F (informative) Example for manual leak check of automatic shut-off valves .63
Annex G (informative) Example of piping and components .65
Annex H (informative) Methods for burner start-up .76
Annex I (informative) Requirements specific to Japan .91
Annex J (informative) Requirements specific to the USA .95
Annex K (informative) Requirements for Europe and associated countries .99
Bibliography . 102
v
ISO 13577-2:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 244, Industrial furnaces and associated
processing equipment, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 186, Industrial thermoprocessing - Safety, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 13577-2:2014), which has been technically
revised.
The main changes are as follows:
— revised document structure with requirements consolidated for the different fuels;
— improvement and specification of the requirements for testing the fuel pipework after construction;
— addition of requirements for gas pressure boosting systems;
— integration of selected requirements from the regional annexes into the global standard text;
— requirements for solid fuels removed;
— additional informative annex listing relevant product standards for components in the different
regions.
A list of all parts in the ISO 13577 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
vi
ISO 13577-2:2023(E)
Introduction
This document is a type-C standard as defined in ISO 12100:2010.
This document is of relevance, in particular, for the following stakeholder groups representing the
market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organisations, market surveillance etc.)
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
The machinery/equipment concerned and the extent to which hazards, hazardous situations or
hazardous events are covered, is indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or -B
standards, the requirements of this type-C standard take precedence over the requirements of the
other standards, for machines that have been designed and built according to the requirements of this
type-C standard.
This document assumes that the equipment is installed in a ventilated area and does not create any
potentially explosive atmosphere. The installation of a TPE in accordance with the requirements of
this document will not by itself require a change to the classification of the TPE location according to
IEC 60079-10-1:2020.
Conformance with product standards, e.g. ISO 22967:2010 or ISO 22968:2010 is not sufficient to ensure
the minimum safety requirements for industrial furnaces and associated processing equipment (TPE).
This document always has priority for TPE.
Industrial furnaces and associated processing equipment (TPE) generally consist of the following
components:
— processing chamber (e.g. steel construction with lining and/or refractory);
— heating systems;
— protective system;
— control and instrumentation system / operator-control level.
ISO 13577-1:2016 provides the general safety requirements common to TPE. This document details in
addition specific safety requirements for combustion and fuel handling systems that are part of TPE as
listed in the Scope.
The requirements for protective systems are specified in ISO 13577-4:2022.
The requirements for reducing hazards from noise are given in ISO 13577-1:2016.
It is assumed that TPE are operated and maintained by trained personnel.
vii
INTERNATIONAL STANDARD ISO 13577-2:2023(E)
Industrial furnaces and associated processing
equipment — Safety —
Part 2:
Combustion and fuel handling systems
1 S cope
This document specifies the safety requirements for combustion and fuel handling systems that are
part of industrial furnaces and associated processing equipment (TPE), including single and multiple
burner systems in thermoprocessing equipment and machines.
NOTE The general safety requirements common to TPE are provided in ISO 13577-1:2016. ISO 13577-1:2016,
Annex B also includes a list of processes for which industrial furnaces and heating systems covered by the
ISO 13577 series are used.
This document deals with significant hazards, hazardous situations and events relevant to combustion
and fuel handling systems as listed in Annex A, when used as intended and under the conditions for use
as described in the instruction handbook.
This document covers:
— fuel pipework downstream of and including the manual isolating valve;
— combustion air supply (including oxygen and oxygen enriched combustion air) and flue gas system;
— burner(s), burner system and ignition device;
— functional requirements for safety related control system.
This document applies to any oxidation of gaseous and liquid fuels with air or other gases containing
free oxygen to release thermal energy in TPE. Annex B includes examples of gaseous and liquid fuels.
For thermal or catalytic post combustion and waste incineration, this document applies only to auxiliary
burners designed to start-up and/or support the process.
The pressure hazard of the piping and components covered by this document is within the maximum
pressure/size relationship of category I as specified in Annex C.
This document also gives the necessary requirements regarding information for use.
This document does not cover hazards from heating generated by electricity.
This document does not deal with the hazards created by the release of flammable substances from the
products processed in the TPE.
This document is not applicable to combustion and fuel handling systems:
— of gas welding and allied processes;
— up-stream of the TPE manual isolating valve.
This document is not applicable to industrial furnaces and associated processing equipment
(TPE), including single and multiple burner systems in thermoprocessing equipment and machines
manufactured before the date of its publication.
ISO 13577-2:2023(E)
This document is not applicable to blast furnaces, converters (in steel plants), boilers, fired heaters
(including reformer furnaces) in the petrochemical and chemical industries.
This document is not applicable to electrical cabling and power cabling upstream of the TPE control
panel/protective system.
2 Normat ive references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 49:1994, Malleable cast iron fittings threaded to ISO 7‑1
ISO 228-1:2000, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 5817:2014, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections
ISO 7005-1:2011, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 7005-2:1988, Metallic flanges — Part 2: Cast iron flanges
ISO 8434-1:2018, Metallic tube connections for fluid power and general use — Part 1: 24° cone connectors
ISO 8434-2:2007, Metallic tube connections for fluid power and general use — Part 2: 37 degree flared
connectors
ISO 8434-3:2005, Metallic tube connections for fluid power and general use — Part 3: O‑ring face seal
connectors
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13574:2015, Industrial furnaces and associated processing equipment — Vocabulary
ISO 13577-1:2016, Industrial furnaces and associated processing equipment — Safety — Part 1: General
requirements
ISO 13577-4:2022, Industrial furnace and associated processing equipment — Safety — Part 4: Protective
systems
ISO 16852:2016, Flame arresters — Performance requirements, test methods and limits for use
ISO 19879:2010, Metallic tube connections for fluid power and general use — Test methods for hydraulic
fluid power connections
ISO 23550:2018, Safety and control devices for gas and/or oil burners and appliances — General
requirements
ISO 23551-1:2012, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 1: Automatic and semi-automatic valves
ISO 23551-2:2018, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 2: Pressure regulators
ISO 23551-5:2014, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 5: Manual gas valves
ISO 13577-2:2023(E)
ISO 23551-6:2014, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements – Part 6: Thermoelectric flame supervision controls
ISO 23552-1:2007+AMD 1:2010, Safety and control devices for gas and/or oil burners and gas and/or oil
appliances — Particular requirements — Part 1: Fuel/air ratio controls, electronic type
ISO 23553-1:2014, Safety and control devices for oil burners and oil-burning appliances — Particular
requirements - Part 1: Automatic and semi-automatic valves
ISO 23555-2:2022, Gas pressure safety and control devices for use in gas transmission, distribution and
installations for inlet pressures up to and including 10 MPa
IEC 60204-1:2016, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60730-2-5:2013+A1:2017 , CSV, Automatic electrical controls – Part 2-5: Particular requirements for
automatic electrical burner control systems
IEC 60730-2-6:2015+A1:2019 , CSV, Automatic electrical controls – Part 2-6: Particular requirements for
automatic electrical pressure sensing controls including mechanical requirements
ASME B1.20.1-2013, Pipe Threads, General Purpose, Inch
CAN/CSA-C22.2 No.199-M89:2 004, , Combustion Safety Controls and Solid‑State Igniters for Gas‑ and Oil‑
Burning Equipment
CAN/CSA-C22.2 No.60730-2-4-14: 2019, Automatic electrical controls for household and similar use -
Part 2-5: Particular requirements for automatic electrical burner control systems
CSA/ANSI Z21.18-2019/CSA 6.3-2019, Gas appliance pressure regulators
CSA/ANSI Z21.21-19/CSA 6.5-2019, Automatic valves for gas appliances
EN 88-1:2016, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa
EN 88-2:2015, Safety and control devices for gas burners and gas burning appliances — Part 2: Pressure
regulators for inlet pressure above 50 kPa up to and including 500 kPa and associated safety devices
EN 88-2:2020, Pressure regulators and associated safety devices for gas appliances — Part 2: Pressure
regulators for inlet pressures above 500 mbar up to and including 5 bar
EN 88-3:2017, Safety and control devices for gas burners and gas burning appliances — Part 3: Pressure
and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types
EN 125:2010+A1: 2015, Flame supervision devices for gas burning appliances — Thermoelectric flame
supervision devices
EN 161:2013, Automatic shut-off valves for gas burners and gas appliances
EN 298:2012, Automatic burner control systems for burners and appliances burning gaseous or liquid fuels
EN 331:2015, Manual operated ball valves and closed bottom taper plug valves for gas installations for
buildings
EN 334:2019, Gas pressure regulators for inlet pressure up to 100 bar
EN 1854:2010, Pressure sensing devices for gas burners and gas burning appliances
EN 12067-2:2004, Safety and control devices for burners and appliances burning gaseous or liquid fuels —
Control functions in electronic systems — Part 2: Fuel/air ratio control/supervision of the electronic type
EN 14382:2019, Gas safety shut-off devices for inlet pressure up to 10 MPa (100 bar)
ISO 13577-2:2023(E)
EN 13774:2013, Valves for gas distribution systems with maximum operating pressure less than or equal to
16 bar - Performance requirements
EN 16678:2016, Safety and control devices for gas burners and gas burning appliances — Automatic shut-
off valves for operating pressure of above 500 kPa up to and including 6,300 kPa
EN 60730-2-5:2015+A1: 2019, Automatic electrical controls for household and similar use — Pa
...