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A typical electricity power plant of 500MW (both nuclear and conventional) has up to 4 kilometres of pipe work carrying superheated steam at pressures of up to 400 bars and temperatures up to 580 oC. The extreme pressures produce hoop stresses in a pipe causing the pipe welds to creep continuously in time until weld creep cracks are generated which, if undiscovered, may grow until the pipe rupture ...
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