What are the insulation materials for heating buried pipelines?
Heating pipe insulation material should be heat-resistant, flame retardant, small thermal conductivity, low moisture absorption, no corrosion. In order to enhance the mechanical strength of the general production into a massive, commonly used rock wool pipe shell; superfine glass wool pipe shell, polyurethane foam pad pad; perlite insulation materials.
The thickness of insulation layer should be reasonable and economical. If the insulation layer is too thin, the heat loss will be increased; the insulation layer is too thick, and the surface area of the radiator will be increased, and the heat loss will also be increased. In general the design, determine the thickness of the insulation layer according to the factors of insulation material properties, heat medium temperature, often used for 40~50 mm thickness.
The heat preservation layer is composed of antirust paint, heat insulating material, moisture-proof layer (used for pipeline in the trench), protective layer, anticorrosive layer (used for trench or directly buried pipe) and top coat (or fireproof coating).The waterproof layer can be used asphalt or aluminum foil protective layer with glass cloth or galvanized steel.
