Market applications of steel-clad steel steam-insulated pipes are expanding with the vigorous development of urban centralized heating and cogeneration. The technology for heat pipelines has been widely adopted domestically. The buried installation method is favored for its excellent insulation effect, high energy-saving efficiency, minimal land use, non-impact on municipal planning, easy installation, short construction period, long service life, and low maintenance costs. Currently, the two types of outer sheath for buried steam-insulated pipes mainly used in China are "plastic-clad steel" and "steel-clad steel." The technical route for steel-clad steel burial involves replacing brick or concrete ditches with steel sleeves on the traditional trench laying basis. The sliding interface of the pipeline is between the pipeline support and the inner wall of the steel sleeve. Buried steam pipelines; buried; external fixation; internal fixation. In recent years, there have been many attempts to use buried steam pipelines in northern cities. When steam pipelines cross city main roads and involve environmental beautification issues, the buried installation method can effectively solve these problems. Moreover, its fast construction progress, good insulation performance, low construction cost, and material savings have led to its increasingly widespread application. As steam buried pipelines are a new phenomenon, the national construction department has not yet formulated formal standards for detailed provisions on steam buried pipelines.
Several characteristics of steel-clad steel-insulated steam pipes from manufacturers, such as fast construction progress, excellent insulation performance, low construction cost, and material savings, have led to their increasing application in the heating industry. As there is no design specification for high-temperature steam pipes, the insulation structures and fixing methods vary among different manufacturers. This article discusses several common characteristics of buried steam pipes available on the market.
