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Public Information Booklet Flares Questions: � Will there be a flare? � Where is the flare going to be? � How many flares are required? � How high will it be? There are 3 flares required for the potential Woodside foundation development (up to 3 trains at first) these include: � An emergency flare, this will be a tall flare structure (approximately 150 metres or 500 feet high) which has three flare outlets (one outlet for very cold gas, one outlet for warm gas, and a spare which is normally disconnected). This flare will very rarely be operated and typically will only be for short amounts of time. � A marine flare for the LNG tanks and loading system which is only used occasionally (approximately 50 metres or 160 feet high); and � An operational flare, which is low, and likely to be flaring small amounts of gas on a regular basis (approximately 30 metres or 100 feet high). As the purpose of an LNG plant is to make as much LNG as possible, the idea is to minimise the amount of flaring (or gas that is burnt off) to maximise the amount of LNG sold. As a result, flaring is minimised with only the smaller operational flare be regularly used. Question - Can there be a ground flare instead of flare tower? The option of a ground flare is being looked at for the operational flare, but not for the emergency flare. This is because repair and maintenance of the emergency flare must be possible while the plant is operating. A ground flare can not be fully accessed when the plant is operating, and would require all gas, liquids and pressure to be removed from the entire plant, which would cause unacceptably long plant shutdowns. In addition a ground flare takes more land area than a flare tower and is noisier. Darwin LNG is able to use a ground flare as it only has a single train and any required flare maintenance can coincide with a shutdown of the single LNG train. For multiple LNG trains maintenance is staggered to minimise the temporary maintenance workforce which results in the flare always needing to be available. Woodside is continuing to look at where a ground flare may be possible to be used. Questions: � What light and heat comes from the flares? � How bright will it be? 5279225 53
Public Information Booklet � How far does the light go and does the heat destroy the environment? � How noisy will it be? � How long for start-up flare? Although flares are needed for the operation of the LNG facility, the normal operating case is to keep all flaring to an absolute minimum as the aim is to sell a much gas as possible as LNG and to reduce emissions wherever possible. Both the emergency flare and marine flare will only be used occasionally. The operational flare is much shorter and therefore wonít be that easy to see from a distance. Woodside is also looking at ways to reduce the number of times it is used, the amount of gas flared/burnt and how easy it is to see the operational flare. People will be able to see when the large emergency flare is used from a long distance away. However this does not happen very often and usually only lasts for a few minutes, with the flame size getting a lot smaller within 10 minutes. All of the flares are designed to deal with the largest amount of heat to be expected whether it is normal operations or the worst type of emergency possible. To protect people and the environment a series of criteria is placed on the maximum heat that can reach the ground. A relatively small exclusion zone at the base of the flare (a circle of a couple of hundred metres or around 219 yards) will be cleared. Outside of this the flare is highly unlikely to directly damage plants or animals. The environmental impacts from the light caused by the flare is expected to be fairly small due to the flaring events not happening very often. In addition, half of these events are likely to occur during the day when they will not increase the light impact. The noise of the flares will be considered as part of the Strategic Assessment. During an emergency event there will be a short period when the flare will be noisy. However this will only be for a few minutes as described previously. For the vast majority of the time, the noise of the flare is similar to the rest of the plant. Question - Can the flare be moved? The flare can be moved either north or south on the site. However, moving the emergency flare away from the coast (east/inland) has the following issues: � More land will be required. The marine flare must remain close to the LNG tanks, as the tanks operate at very low pressure and the gas can not flow large distances to reach the flare. If the marine, emergency and operational flares were moved apart, the sterile areas around each flare would no longer overlap. This will require more land to be used than the current layout. Note: the sterile area is the area in which there is too much heat from the flare to allow any people or equipment to remain, for the worst flaring situation. � The flare will be seen from further away. The slope of the land runs upwards away from the coast, if the flare is moved away from the coast the entire flare will be higher and easier to see from further away. � The piping and piperacks will be seen from further away. The slope of the land runs upwards away from the coast. The piping to all flares would normally have a 5279225 54
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