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The metal product P is produced in plant C , where metal sheets are cut and pressed to form the product P . Plant B
The metal product P is produced in plant C where metal sheets are cut and pressed to form the product P Plant B produces the metal sheets, via melting and rolling of ingots. The ingots come from plant A where the mineral is extracted, turned into metal and cast into ingots. Plant B is situated km from plant C Transportation occurs by truck, consuming on average kg of diesel per km and per ton of material transported. Plant A and plant B are neighbouring plants; the distance between them is small and hence transportation is negligible. In the production of P in plant C there is also some process scrap pieces of metal clippings from the cutting of the metal sheets Three quarters of the process scrap generated by plant C is sent back to plant B where it is melted together with the new metal and then rolled into sheets.
Plant A produces tonnes of ingots per year using tonnes of raw minerals and x MJ of electricity; the plant releases kgyear of HCl to atmosphere and kgyear of Cu to freshwater. Plant B produces tonnes of metal sheets per year, consuming x MJ of electricity; emissions to air from plant B are equal to kgyear of HC generic hydrocarbons Plant C produces tonnes of product P per year using x MJ of electricity; emissions to air from plant C are equal to kgyear of HC
The Functional Unit equals pieces of P Each product P weights g To produce pieces of P m of metal sheet is needed in plant C; the thickness of the metal sheet is mm and the density of the metal is kgm
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