Steel-sleeved direct-buried prefabricated steam insulation pipes (Manager Wang
) The production technology company uses the imported high-pressure complete set of polyurethane foaming equipment to produce the trinity direct-buried thermal insulation pipes with excellent overall performance, and strictly implements shot blasting and rust removal on the outer surface of the steel pipes. And corona treatment process on the inner surface of the outer protective pipe to further improve the bonding performance of the insulation pipe. The insulation layer material is rigid polyurethane foam with a density of / to /, which fully fills the gap between the steel pipe and the casing, and has a certain bonding strength, forming a strong bond between the steel pipe, the outer casing and the insulation layer. overall.
The company only uses heat shrinkable tape products approved by the European Heating Association. The existing suppliers of heat shrinkable tape products are American companies or Canadian companies. The adhesive layer and hot melt temperature of the heat shrinkable tape used for joints of prefabricated insulated pipes for district central heating are specially designed for this purpose. This welding method of electrofusion sleeve uses a sleeve with pre-embedded resistance wire. The hot fusion sleeve is tightly tied to the outer sleeve with a binding tape and then the power is turned on to start welding. The welding time is preset and the welding is completed after automatic power off. , remove the straps after the casing has completely cooled. Using this method of jointing is easy to construct and the welding joint is firm. Installation methods This piping system can be applied to all known installation methods of direct buried piping systems. In addition to the usual compensated laying methods, the following three non-compensated laying methods can show its advantages. The pipe temperature when the pipeline is integrally welded in the cold installation method is equal to the ambient temperature during backfilling. Cold installation is the most economical and fastest installation method. The pipeline can be backfilled in time during construction, which minimizes or even eliminates the need for compensators and fixed brackets, thus saving a lot of money. Because the axial stress of the pipe increases, it is sometimes necessary to strengthen the tee or increase the burial depth.
Steam pipe insulation