Odorant is required to be added to fuel gas under the Petroleum and Gas (Production and Safety) Act 2004. This ensures the
presence of gas is readily detectable by untrained persons, without the use of gas detectors.
Prescribed concentrations of odorant are added to provide a distinctive and unpleasant odour, so that the presence of gas in air at concentrations below the Lower Explosive Limit (LEL) is readily detectable. Adding the odorant does change the physical or chemical property of the fuel gas.
Where unodourised gas is present, there is an elevated level of risk, and alternative or additional controls may be required. This level of risk is further elevated where people are required to access confined spaces or ‘enclosed’ industrial equipment supplied with unodourised gas.