Appendix G - Requirements for Chimney Heights Appendix G Requirements for Chimney Heights 1 In uncomplicated terrain without the presence of high buildings, or no other significant sources of air-borne contaminants, the height of any chimney discharging the products of combustion from conventional fuel burning equipment from the combustion of: 1.1 Coal or oil where the release of sulphur dioxide or nitrogen oxides is individually less than 2 kg/hr; the minimum chimney height shall be the higher of either 8metres above finished ground level or 3 metres above the highest substantial part of any building located within 40 metres of the chimney or any part of the building to which the chimney may be attached; 1.2 Natural gas, liquefied gas or wood, where the release of nitrogen oxides is less than 0.5 kg/hour or the heat input is less than 2 MW: the minimum chimney height shall be the higher of either 8 metres above finished ground level or 3 metres above the highest substantial part of any building located within 40 metres of the chimney or any part of the building to which the chimney may be attached; 1.3 Coal or oil where the release of sulphur dioxide is equal to or exceeds 2 kg/ hour but is less than 50 kg/hour and the maximum energy release is less than 10 MW: the height of the chimney shall be calculated in accordance with Table 1; 1.4 Natural gas, liquefied gas or wood, where the release of nitrogen oxides is equal to or exceeds 0.5 kg/hour but is less than 20 kg/hour and the maximum energy release is less than 50 MW: the minimum chimney height of the chimney of the chimney shall be calculated in accordance with Table 2. Table 1 Minimum chimney heights where coal or oil is used as fuel Sulphur Dioxide Chimney Sulphur Dioxide Chimney Emission Height Emission Height (kg/hour) (metres) (kg/hour) (metres) 2.0 8.5 14.0 20.3 2.5 9.5 15.0 20.6 3.0 10.4 16.0 20.9 4.0 12.0 17.0 21.1 5.0 13.4 18.0 21.4 6.0 14.7 19.0 21.6 7.0 15.9 20.0 21.8 8.0 17.0 25.0 22.8 9.0 18.0 30.0 23.7 10.0 19.0 35.0 24.4 11.0 19.4 40.0 25.1 12.0 19.7 45.0 25.7 13.0 20.0 50.0 26.2 App G - 1