Refractory insulation

A furnace member comprising a generally horizontal metal pipe in a furnace and insulated by refractory sheathing consisting of metal coupling links which each rest on and fit around an upper part of the pipe, each link having substantially radially outwardly extending tile-engaging projections spaced apart around the coupling link, an inner resilient layer of refractory fibrous material covering the coupling links except for the tile-engaging projections which project through the inner layer, and an outer layer of refractory tiles which extend around and cover the inner layer, circumferentially adjacent tiles substantially meeting in abutment overlapping each coupling link and having holes engaged by said projections such that each link joins together two adjacent tiles, so that said tiles and links, with the inner layer interposed, positively interengage so as to embrace and hold in place around the pipe.