Annular space insulation shall be expanded perlite ore, except for nozzle transitions.At nozzle transitions the insulation shall be mineral wool (ceramic fiber).The manufacturer and grade of insulation (perlite and mineral wool) to be used shall be specified by the supplier.The insulation materials manufacturer, grade, and density are subject to approval by Air Products.Perlite ore’s minimum density shall be 56 kg/m3.Fiberglass mineral wool’s minimum density shall be 96 kg/m3.