GB766693A - Improvements in or relating to the thermal insulation of curved surfaces - Google Patents

Abstract

766,693. Heat-insulation coverings for pipes. NADIN, Ltd., J. June 20, 1955 [June 19, 1954], No. 18072/54. Class 99(2) [Also in Group X] Thermal insulation for a pipe or drum is built up in two or more sections A each comprising a layer of mineral wool D or like loose and flexible material, confined between inner and outer reticulated or perforated metallic sheets B. C of a relatively rigid nature, such sheets having been pre-shaped to the required curvature and being maintained at a constant distance apart by means of tie-wires or distance pieces, or both As shown, in Fig. 1, the material D is retained between the sheets B, C by lacing together the edges of the sheets with wire E. or by separate tie-wires. Mutual concentricity of the sheets is ensured by radially-disposed wire staples F, Fig. 5. To prevent gravitation of the material D towards the lateral part of the section A when the latter is stored or applied convex side uppermost the edges of the outer sheet C are connected by wire ties G stretched over the convex surface of the inner sheet B as shown in Fig. 6, the ties being preferably positioned by staples F; alternatively, or in addition, rigid distance peces of heat-resisting material are inserted between the medial parts of the sheets (Fig. 7, not shown). The sheets B, C may be part-spherical or otherwise curved in accordance with the surface to be covered, and the lateral edges thereof need not be rectilinear or parallel. The apparatus for making the sections comprises a rectangular box 12, Fig. 2, the sides of which are covered with panels 11 of perforated sheet metal lined on the inside with sheets 13 of canvas or other permeable fabric. Secured around the open end of the box is a muff 23 of a permeable fabric embracing a nozzle 21 connected to a canvas hose 22. Precurved sheets B, C of wire mesh or expanded metal are positioned in the box so that one end of the sheets is in contact with the closed end of the box and the nozzle projects into the space between the sheets. The material D is blown through the nozzle 21 by air pressure until the space between the sheets is filled to the required density, the flexibility of the muff 23 allowing the nozzle to be traversed in a semi-circular path; the box is provided with grooved rollers 24 engaging rails 25 and is moved relatively to the nozzle. An inspection window is provided in the top of the box.