Steel-clad steel steam-insulated pipelines have a wide range of market applications, expanding with the vigorous development of urban centralized heating and combined heat and power generation. The technology for thermal pipeline applications has gained widespread use domestically. The direct-burial method, with its excellent insulation performance, high energy-saving efficiency; minimal land use without affecting urban planning; easy installation, short construction period; long service life, and low maintenance costs, has been universally favored since its introduction. The types of outer protective sleeves for the direct-buried steam-insulated pipes mainly used in our country are "plastic-clad steel" and "steel-clad steel." The technical route for steel-clad steel burial is based on traditional trench burial, replacing brick or concrete trenches with steel sleeves. The sliding interface of the pipeline is the interface between the pipeline support and the inner wall of the steel sleeve. Direct-buried steam pipelines; direct burial; external fixation; internal fixation. In recent years, many trials have been conducted in northern cities with direct-buried steam pipelines. When steam pipelines cross urban main roads or involve environmental beautification issues, the direct-burial method can effectively solve these problems, and it is increasingly widely used due to its fast construction progress, good insulation performance, low construction cost, and material savings. Since direct-buried steam pipelines are a new phenomenon, the national construction department has not yet formulated formal standards for detailed regulations on direct-buried steam pipelines.

Steel casing steel insulated pipeline manufacturers' prices, the characteristics of directly buried steam pipelines, as a new material in the heating industry, have gained increasingly widespread application due to their fast construction progress, excellent insulation performance, low construction cost, and material savings. Since there is no design specification for high-temperature steam pipelines, the insulation structure and fixation methods vary among different manufacturers. This article discusses the characteristics of several commonly seen directly buried steam pipelines on the market.