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ILEX Energy Consultancy has produced a report detailing the findings of phase on ...

ILEX Energy Consultancy has produced a report detailing the findings of phase one of a gas quality exercise initiated by the UK Government. The document is available on the DTI website at www.dti.gov.uk/energy/domestic_markets/gas_market/index.shtml Phase one examined whether there would be a gas quality problem, in particular but not exclusively in relation to the Wobbe number* of future imported gas. It explored the UK’s capability of importing gas of the expected specification, taking into consideration existing gas terminal facilities as well as known future import projects. The study confirms that the future Wobbe specification of much gas imported into the UK before processing is likely to fall outside the current upper Wobbe limit in the Gas Safety Management Regulations (GSMR). In short, the UK’s increasing dependence on imported gas does raise the question whether the current upper Wobbe limit should be increased. * The Wobbe number represents a measure of the heat release when a gas is burned at constant gas supply pressure. The Wobbe limit range in the UK’s Gas Safety Management Regulations is between 47.20 MJ/cm and 51.41 MJ/cm. The regulations can be viewed at www.hmso.gov.uk/ Higher Wobbe number gas requires more oxygen to burn efficiently. If the appliance cannot deliver sufficient oxygen, there is incomplete combustion, causing two problems - (a) production of carbon monoxide - a highly poisonous gas, bringing the risk of fatalities, and (b) production of soot - an inconvenience which leads to higher maintenance costs.
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