chapter  4
32 Pages


Gas can be used for many purposes. In the home it can provide facilities for cooking, space heating, water heating and refrigeration.∗ In industry and commerce, gas is used in ovens, furnaces, baths and

as working flames for the cutting, melting and heat treatment of metals, for the production of glass and pottery, for manufacturing foods and for drying paints and enamels. Many manufacturing processes require heat and gas can easily be applied to provide it. Many different shapes and sizes of flames are required for these

different applications, each of which is produced by its own gas burner. Burners may, however, be divided into two main classes, aerated and non-aerated, perhaps better described as pre-aerated and post-aerated burners. As its name implies, the pre-aerated burner has some, or all, of the air for combustion mixed with the gas before it is burned. Pre-aerated burners may be further subdivided into those which

obtain their primary air supply directly from the atmosphere and are called ‘atmospheric’ or ‘natural draught’ burners and those whose air is supplied by an electric fan and which are called ‘forced draught’ burners or sometimes ‘air blast’ or ‘pre-mix’ burners. The following nine sections deal with the principles of natural draught pre-aerated burners.

Parts of a Burner