Cladding, economics

The chamber is externally insulated and clad. Combustion equipment for solid fuel may be spreader or traveling-grate stokers or by pulverized fuel or fluid bed. Oil and gas burners may be fitted either as main or auxiliary firing equipment. The boilers will incorporate superheaters, economizers and, where necessary, air preheaters, grit arresters, and gas-cleaning equipment to meet clean air legislation. 

Explosively clad metals, of which Deta-Clad4 is an example, are used mostly for small items such as tube sheets and heads for small heat exchangers or vessels. It is usually not economical for large surfaces or complex shapes. Nickel-chromium-molybdenum alloys and some other expensive metals can be applied to carbon steel by explosive bonding. 

Boiler cost estimates include fittings, refractory, insulation and cladding for outdoor installation, internal piping, platforms and stairs, burner and flame safety equipment, economizer, force-draft fan plus drive and soot blowers. 

The data presented in Fig. 4-1 give a criteria for economic selection of stainless-steel-clad construction. Similar data for other metals can be obtained from cladding manufacturers. 

Resistance to radiation damage so that physical properties are not degraded Chemical stability with respect to coolant in case of cladding failure Physical and mechanical properties that permit economical fabrication... 

On account of their insensitivity to solar radiation, some polyester resins are particularly suitable for weather-resistant topcoats (e.g.. facade claddings, blades of shutters and Venetian blinds, vehicle claddings, metal signs). Melamine-formulated paints are economical and have a well-balanced property profile. Polyurethane-formulated paints have an even better processability and weather resistance (colorfastness, chalking resistance) [2.92],... 

---