The calculation of economic thickness is complex and in. The pipe diameter plus two times the insulation thickness m k is the insulation thermal conductivity w m 1 k 1 δt is the temperature difference between the insulation surface and ambient air t s t a k h s is the insulation to air heat surface heat transfer coefficient w m 2 k 1. It is suggested that bs 5970 code of practice for thermal insulation of pipe work and equipment in the temperature range 100 c to 870 c be consulted.
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