Refractory application process and method

摘要

A refractory insulation on boiler tubes using studs circular in cross-section and having shoulders intermediate their ends with washers frictionally engaged on the studs sandwiching a mesh therebetween. The shoulder restrains movement of the first washer and mesh toward the substrate and the second washer retains the mesh from movement away from the substrate. A first insulation is applied to the substrate through the mesh and a second insulation layer is applied over the mesh to a predetermined thickness determined by the height of the studs above the shoulders. Pins can be welded to the tops of the studs and used to impale fibrous insulation.