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Rule 6 Small internal or external combustion engines, heating appliances and electrical generation plants

http://www.gw.govt.nz/rule-6-small-internal-or-external-combustion-engines-heating-appliances-and-electrical-generation-plants

Rule 6 Small internal or external combustion engines, heating appliances and electrical generation plants

Updated 3 July 2015 12:58pm

The discharge of contaminants into air in connection with any combustion process (other than discharges to air from mobile transport sources, which are not controlled by this Plan), involving:

(1) the use of an internal or external combustion engine, heating appliance or electrical generation plant(s) with a combined generation capacity of 2 MW or less (measured by the higher heating value of the input fuel);

is a Permitted Activity, provided it complies with the conditions below.

Conditions

The person(s) responsible for the activity shall ensure that:

(i)there is no discharge of particulates of a concentration greater than 250 mg/m (at STP), measured at the point of discharge;

(ii)there is no smoke, dust, odour, gas or vapour from the discharge, which is noxious, dangerous, offensive or objectionable at or beyond the boundary of the property;

(iii)where the generation capacity is 100 kW or less (measured by the higher heating value of the input fuel) the discharge shall be made at a point which as far as practicable avoids the adverse effects, or potential adverse effects, of downwash; or

where the generation capacity is greater than 100 kW (measured by the higher heating value of the input fuel) discharges must be through a chimney(s) which should terminate at least 3 metres above the level of any adjacent area to which there is general access; and

(iv)chimneys discharging the products of combustion are designed to ensure the uninterrupted vertical discharge of vapours.

Note: The burning of materials explicitly excluded from Rule 19 is a discretionary activity. While an activity may appear to be permitted under Rule 6, it is a discretionary activity if it involves burning of one of the materials listed in Rule 19, e.g., use of untreated waste oil as a combustion fuel.

Explanation of Rules 6 and 7: Rules 6 and 7 relate to the discharge of contaminants to air from small and medium scale internal or external combustion engines, heating appliances and electrical generation plants. Both rules apply to industrial or trade premises and other premises such as apartment blocks, office buildings, hotels, electrical generation plants, and domestic premises. The rules do not cover the discharge of contaminants from mobile transport sources.

Both Rules 6 and 7 apply regardless of the fuel being used. Rule 6 permits discharges from facilities with a combined generation capacity of 2 MW or less (measured by the higher heating value of the input fuel), subject to compliance with the stated conditions. The discharge of contaminants from facilities with a generation capacity greater than 2 MW but less than 5 MW are covered by Rule 7 and are controlled activities, and again are subject to the stated conditions. Discharges of contaminants from facilities with a combined generation capacity equal to and greater than 5 MW are discretionary activities covered by Rule 23. Similarly, processes otherwise covered by Rules 6 and 7 which cannot meet the conditions, are discretionary activities and are also covered by Rule 23. The limits indicated in Rules 6 and 7 apply to the cumulative total heat released from a particular premises (based on the higher heating value of the input fuel).

Rule 7 deals with medium to large scale processes. These activities are controlled activities for which a resource consent must be obtained from the Council, because of the greater potential for adverse effects resulting from the discharges. Instead of explicit conditions relating to avoiding or minimising the adverse effects of downwash from the point of discharge, the Council has chosen to reserve its discretion about the height and design of the discharge point. The Council will establish the height and design of chimneys/discharge points based on guidelines for making such assessments, as detailed in Appendix 3. For larger discharges dispersion modelling work may be required to assess likely effects on surrounding areas.

The conditions require that discharges do not generally exceed an opacity of 20 percent, that there is no discharge of particulates of a concentration greater than 250 mg/m 3 (at STP) measured at the point of discharge, that there are no noxious, dangerous, offensive or objectionable discharges. Rule 6, relating to smaller scale processes includes two further sets of conditions (conditions iii and iv) which are aimed at ensuring against fugitive emissions and minimising the adverse effects from downwash. These conditions have the added benefit of enabling greater ease of monitoring.