ABSTRACT The measuring and mathematical modelling of heat flow and other thermal properties can be contentious issues. This paper describes the apparatus, equipment and methodology used to determine the thermal transmittance of insulated pipe-in-pipe flowlines. Results from the trials evaluating the performance and sensitivity of the equipment are presented together with an evaluation of the thermal characteristics of pipe-in-pipe specimens, insulated with mineral wool or microporous insulation, over the temperature range 50°C to 200°C.
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