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Public Information Booklet Question ñ The proposed Gorgon development on Barrow Island is to be located on approximately 300 hectares of land ñ why does the Precinct require 1,000 hectares? The Gorgon development is based on a 15 million tonnes per annum development within 300 hectares. If this was scaled up to the 50 million tonnes per annum that forms the basis of the proposed Precinct an area of 1,166 hectares would be required. It is also important to note that the general public is not allowed to access Barrow Island so the safety distances to the plant fence is very different and can be reduced. In addition Barrow Island has existing infrastructure that isnít included in the 300 hectares. Question ñ Can the proposed size of the trains be confirmed as well as the reasoning for this. As the capacity of the LNG processing train increases, the area required for each train also increases (in the context of a 4 to 7.5 million tonnes per annum LNG train). This occurs due to the increased size of the components in the LNG train and the increase in safety distances within and between the trains due to increases in the hydrocarbon inventory (amount of gas) in each train. This is represented in the below diagram. As a result, a higher number of trains for the same ultimate capacity doesnít increase land area required. Medium Trains Larger trains 450m 706m = 31.8 hectares The preference to use small LNG trains has been driven by a number of different reasons. These include: � smaller hydrocarbon inventory (less gas) in each train leading to a safer design; � proven technology with many examples around the world; � less land needs to be used; 3 3 3 � increased certainty for cost and schedule (time to build); and � no significant cost difference to larger trains. 632 630m = 39.8 hectares 5279225 49 432 432
Public Information Booklet Questions: � Will the plant be air or water cooled and what impact does this have on plant layout? � What is air cooling and how is this used in LNG processing facilities? The main purpose of an LNG plant is to chill natural gas down to minus 161 degrees Celsius. To achieve this, the heat taken from the LNG needs to be managed. This can be done by either using water or air. This is similar to a carís engine needing to be cooled by an electric fan and a radiator. Water Cooled Plants Due to the large volume of water required to cool an LNG plant, it is usually done with sea water (although fresh water is an alternative). The use of water cooling means the LNG train can be slightly smaller compared to an air cooled one, however this is a relatively small decrease (and wonít change other areas needed for utilities, power generation, separation distances, laydown etc). The large volume of water used for cooling is extracted from the ocean and then put back at a higher temperature. Air Cooled Plant Air cooled plants use large radiators (like a car radiator) to cool the plant. This is how all existing LNG plants in Australia are operated. This removes the need to release warm water into the sea. Visual Impact Questions: � Can the plant be sunk into the ground? � Can the LNG tanks be sunk into the ground? Sinking of the entire plant is not possible, due to safety, environmental and cost issues. The safety issues are: � Any gas leaks could stay in the areas below ground; potentially injuring people when the gas is inhaled, or causing fire or explosion. � High rainfall from cyclones and rain from the wet season would collect in the areas below ground requiring collection and pumping out. Electrical equipment being under water is a high risk for the safety of the plant and people working in it. The cost issue is: � Significant additional cost would occur due to the extra earthworks to remove soil and create retaining walls around the plant equipment. 5279225 50
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