The task of thermal insulation construction is to assemble the primary insulation layer, reinforcing materials, and surface finish materials into a thermal insulation structure according to design specifications. Currently, there are seven commonly used construction methods for thermal insulation structures.
1.Coating insulation method
Using unshaped insulation materials (such as expanded perlite) mixed with a binder and setting accelerator, blend with cement according to specific proportions to form a plastic paste. Apply this mixture to insulated piping and equipment. The coating method represents a traditional insulation structure and process, facilitating construction at junctions, filling holes, insulating equipment and piping sections requiring maintenance, and covering all irregularly shaped insulated objects.
2.Tie-wrap insulation
Tie-up insulation involves directly wrapping insulation boards, pipe shells, pipe sleeves, or curved blocks made from porous insulation materials or mineral fiber insulation materials around equipment and pipelines. These are then secured externally using 1.2–2 mm galvanized iron wire. Tie-up insulation is a widely adopted insulation structural form.
3.Prefabricated Insulation
The primary insulation layer and the outer protective layer are both molded plastic products. On-site installation requires only positioning them according to specifications and securing them in place. Most insulation for specialized equipment employs prefabricated insulation structures.
4.Fill-in insulation method
Loose-fill insulation involves directly packing loose mineral fiber materials or porous granular materials around equipment and piping to achieve a certain degree of compaction. This method is typically used for sealing and insulating boiler wall penetrations, as well as for removable insulation structures at valve flanges and expansion joints.
5.Adhesive Insulation Method
The adhesive bonding method for thermal insulation involves applying an adhesive to bond insulating alumina-silicate fiber boards to metal or ceramic surfaces, forming an insulating structure. This method is particularly suitable for the installation of alumina-silicate fiber boards.
6.Spray-Applied Structural Insulation
Spray-applied structural insulation involves using specialized equipment to spray organic foam insulation material onto the insulation surface, forming a spray-applied insulation structure.
7.Metal Reflective Insulation
Metal reflective insulation employs multi-layer heat shields made of stainless steel heat-resistant foil, with an air gap of approximately 1.5mm between each layer. This insulation structure primarily reduces radiative and convective heat transfer, making it suitable for applications involving vibration and high-temperature conditions.
