ISO 22968:2010

INTERNATIONAL ISO
STANDARD 22968
First edition
2010-11-01
Forced draught oil burners
Brûleurs à air soufflé pour combustibles liquides

Reference number
©
ISO 2010
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ii © ISO 2010 – All rights reserved

Contents Page
Foreword .v
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
3.1 General .2
3.2 Fuel mass flow rate and performance.3
3.3 Test rig and combustion chamber.4
3.4 Composition of the gaseous combustion products .5
3.5 Adjustment, control and safety devices .6
3.6 Sequencing times.7
3.7 Diagrams .9
4 Classification of oil burners .9
4.1 General .9
4.2 Types of atomization.9
4.3 Automatic oil burner control methods.9
4.4 Means of ignition.10
5 Constructional and operational requirement .10
5.1 Construction and operation .10
5.2 Safety devices.20
5.3 Spurious light signals.22
5.4 Combustion.22
5.5 Combustion product quality.23
5.6 Combustion quality of the combustion products for other liquid fuels .24
5.7 Excess air ratio.24
5.8 Operational requirements.24
6 Test methods .26
6.1 General .26
6.2 Ambient test conditions.26
6.3 Combustion test chamber .26
6.4 Measuring equipment .34
6.5 Measuring accuracies.34
6.6 Test conditions .35
6.7 Test programme .36
6.8 Replacement of individual parts and equivalent components .43
6.9 Electrical safety .43
7 Conformity evaluation.44
8 Marking, labelling and packaging.44
8.1 General .44
8.2 Data plate .44
8.3 Other markings .44
8.4 Instructions for application, installation, commissioning, adjustment, maintenance and
operation .45
8.5 Marking on the packaging .46
Annex A (normative) Smoke number.47
Annex B (normative) Emission measurements and corrections.48
Annex C (informative) Conversion factors . 50
Annex D (normative) FID measuring method for recording the unburnt hydrocarbons. 52
Annex E (informative) Conformity evaluation . 53
Annex F (informative) Examples of equipping of burners . 56
Annex G (informative) Additional recommendations for specific applications. 60
Annex H (informative) Air-proving device check . 62
Annex I (normative) Regional requirements specific to European countries. 63
Annex J (normative) Requirements specific to Japan . 64
Annex K (normative) Requirements specific to Australia. 66
Annex L (normative) Requirements specific to Korea . 67
Annex M (normative) Requirements specific to the USA. 69
Annex N (informative) Electrical interfaces for burners. 71
Bibliography. 75

iv © ISO 2010 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 22968 was prepared by Technical Committee ISO/TC 109, Oil and gas burners.
Introduction
This International Standard is primarily intended for application to automatic forced draught oil burners having
a combustion air fan, operated with liquid fuels and intended to be marketed as a complete assembly.
Many burners are designed to operate using a wide range of fuel oils with little or no modification other than
adjustment of the air supply.
When applying the requirements specific to a country or region, which are given in the various annexes, it is
essential that a level of safety be ensured that is at least equivalent to that provided for by the requirements of
the main body of this International Standard.

vi © ISO 2010 – All rights reserved

INTERNATIONAL STANDARD ISO 22968:2010(E)

Forced draught oil burners
1 Scope
This International Standard specifies the terminology, test procedures and general requirements for the
construction and operation of automatic forced draught oil burners supplied with a fuel having a viscosity at
2 2
the burner inlet of 1,6 mm /s (cSt) to 6 mm /s (cSt) at 20 °C or higher, boiling petroleum in accordance with
ISO 8217-based first raffinates, and the provision of related control and safety devices.
It is applicable to the following:
a) automatic oil burners (hereinafter called “burners”) fitted with a combustion air fan and equipped as
described in Clause 5, intended for use in appliances of different types and operated with fuel oils;
b) single burners with a single combustion chamber, for which, where such burners are fitted to a single
appliance, the requirements of the relevant appliance standard also apply;
c) single-fuel and dual-fuel burners when operating only on oil;
d) the oil function of dual-fuel burners designed to operate simultaneously on gaseous and liquid fuels,
which, for the former, the requirements of ISO 22967 also apply.
It is not applicable to burners used in direct fired processes either with defined combustion chamber
applications or where the combustion chamber wall surface temperature is greater than 750 °C or the
heat-transfer medium temperature is greater than 500 °C.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references only the edition cited applies. For undated references the latest edition of the referenced document
(including any amendments) applies.
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 1129, Steel tubes for boilers, superheaters and heat exchangers — Dimensions, tolerances and
conventional masses per unit length
ISO 3183, Petroleum and natural
...