AS 1375:2023 Industrial fuel-fired appliances
Standards Australia
Supersedes: AS 1375-2013 Industrial fuel-fired appliances
Draft Designation: DR AS 1375:2022The objective of this document is to specify requirements and safety principles for the design, installation and operation of industrial appliances that involve the combustion of gas or liquid fuel and the controlled generation of combustible vapours or combustible dusts.
The major changes in this edition are as follows:
(a) Revision of risk assessment and the requirement to conduct a HAZOP to align with other fuel-fired appliance standards.
(b) Inclusion of pre-purge to align with international standards and trends in appliance and burner design that do not require a pre-purge under specific circumstances.
(c) Clarification of the incineration process in Clause 4.2.
(d) Addition of guidance on the use of valves for liquid LP gas burner applications.
(e) Revision of Appendix D to achieve a higher level of accuracy when calculating critical time for burner systems. Background information on the research underpinning the methods used for calculating critical time and its application to burner systems will enable appliances, which do not strictly conform to the critical time calculations provided, to be assessed for safe operation during start up.
(f) Inclusion of worked examples for the use of formula in Appendix E, referencing NFPA 68 or similar standards where the limits of the given equations for explosion relief are exceeded.
(g) Revision of Appendix F to reflect changes to EN 1539 and similar standards.
(h) Expansion of Appendix G to include additional commentary relating to the use of LEL and LFL data and the application of LOC data. Where the use of LOC data relates to purging systems, NFPA 69 is now referenced as the Standard to be used.
(i) Review of the typical layout of liquid fuel supply and control systems in Appendix H.
(j) Inclusion of guidance on risk assessment in Appendix N to be consistent with other fuel-fired appliance standards such as AS 3814.
(k) Addition of Appendix O which summarizes potential hazards.
(l) Addition of Appendix P which contains guidelines for assessing the fitness for purpose of legacy appliances, unusual applications, novel designs or the application of new technologies that do not conform to this document.
(m) Addition of Appendix Q which covers the use and maintenance of flexible hoses for conveying fuels to burners and appliances. It also contains information on hose and connection failures that have led to serious incidents, how to visually inspect flexible hoses, typical faults in installations, and the suitability of hose components.
(n) Addition of Appendix R which provides guidance on waste gas flares and where ISO 23251 and ISO 25457 are not applied. In the case of biogas flares, it provides guidance on many aspects of flare safety and may be used in conjunction with ISO 22580.
(o) Addition of Appendix S which lists apparatus for the use and application of LEL devices that monitor flammable vapours and gases for appliances and that need to conform to specific allowable concentration conditions. This aligns with NFPA 86 and EN 1539.
(p) Addition of Appendix T which provides guidance on hydrogen combustion safety.
The terms “normative” and “informative” are used in standards to define the application of the
appendices to which they apply. A “normative” appendix is an integral part of a standard, whereas an “informative” appendix is only for information and guidance.
Originated as AS 1375-1973 and part of AS 1853-1976. Previous edition AS 1375-2013. Fourth edition AS 1375:2023.
Contents:
Preface
Introduction
Section 1: Scope And General
Section 2: Appliance Design And Construction
Section 3: Combustion System
Section 4: Control Of Non-Fuel Combustible Atmospheres
Section 5: Installation, Commissioning, And Operation
Section 6: Flues (Chimneys), Exhaust Systems And Ducts
Section 7: Additional Requirements For Liquid Fuel-Firing Systems
Appendix A: (Informative) Operating Data, Special Purpose Ovens
Appendix B: (Informative) Maintenance And Checks Of Safety Devices
Appendix C: (Informative) Ignition Procedures
Appendix D :(Normative) Critical Energy And Critical Time
Appendix E: (Informative) Explosion Relief
Appendix F: (Normative) Dilution
Appendix G: (Informative) Characteristic Data For Flammable Gases And Combustible Dusts
Appendix H: (Informative) Typical Commissioning Procedure
Appendix I: (Informative) Hazard And Operability Study (HAZOP)
Appendix J: (Informative) Suitability Of Materials For Liquid Fuel Firing Systems
Appendix K: (Informative) Filtration Of Liquid Fuels
Appendix L: (Informative) Typical Liquid Fuel Burner Firing Sequence
Appendix M: (Informative) Typical Layout Of Liquid Fuel Supply And Control Systems
Appendix N: (Informative) Risk Assessment For The Operation And Installation Of An Industrial Fuel-Fired Appliance
Appendix O: (Informative) List Of Significant Hazards
Appendix P: (Informative) Fitness-For-Purpose Assessment
Appendix Q: (Informative) Maintenance Of Flexible Connections And Hoses
Appendix R: (Informative) Waste Gas Flare Systems
Appendix S: (Informative) Apparatus Used To Measure The Concentration Of Flammable Vapours In Dryers
Appendix T: (Informative) Hydrogen Combustion Safety — A Brief Introduction
AG-011 Industrial and Commercial Gas-Fired Appliances.
AG-011
Australian Gas Association; Australian Petroleum Production and Exploration Association; Engineers Australia; Gas Appliance Manufacturers Association of Australia; Gas Technical Regulators Committee.
