Q/N = 80W/m. Pipe Dia is 12″ hence radius is 6″. Radius in meters : (6″ X 25.4)/1000 = 0.1524 meters. Extra margin must be taken on insulation thickness as sometimes conducting heat transfer through insulation may become higher than convective heat transfer due to air on outside wall of insulation.
What type of insulation is used for pipes?
Polyethylene. Polyethylene is a flexible plastic foamed insulation that is widely used to prevent freezing of domestic water supply pipes and to reduce heat loss from domestic heating pipes. The fire performance of Polyethylene is typically 25/50 E84 compliant up to 1" thickness.
What is the most efficient pipe insulation?
Phenolic foam insulation is the most energy efficient insulation available for any given thickness.