1、内钢管
1. Inner steel pipe
2、富锌底漆
2. Zinc rich primer
3、滑动导向支架
3. Slide guide bracket
4、耐高温玻璃棉
4. High temperature resistant glass wool
5、铝箔反射层
5. Aluminum foil reflector
6、空气保温层
6. Air insulation layer
7、外套钢管
7. Outer steel pipe
8、外套钢管防腐层
8. Anticorrosive coating of outer steel pipe
高温直埋式预制蒸汽保温管(外滑动)
High temperature directly buried prefabricated steam insulation pipe (external sliding)
直埋式高温蒸汽用预制保温管是地下直埋中的一种管道，采用没有混凝土结构的情况下也可以进行地下直埋的方式，即工作钢管的热膨胀在外管内进行，从而降低了材料成本，缩短了施工日期，并保障了供热管道的性，可以在不同温度环境下更的广泛应用，尤其适用于高温蒸汽管道项目。使用温度可达150℃-450℃。
The prefabricated insulation pipe for directly buried high-temperature steam is a kind of pipe directly buried underground. It can also be directly buried without concrete structure, that is, the thermal expansion of the working steel pipe is carried out in the outer pipe, so as to reduce the material cost, shorten the construction date, and ensure the safety of the heat supply pipeline. It can be widely used in different temperature environments more safely It is especially suitable for high temperature steam pipeline project. The operating temperature can reach 150 ℃ - 450 ℃.
内钢管选用二度无机富锌底漆（耐温≥400℃）防腐涂层，管道端口选用聚乙烯薄膜或三层PE冷缠带密封，防止安装前进入潮气或施工中进入水。保温材料多层错缝包扎，有效减少了热损失，同时控制外套表面措施，防止了冷桥的产生，从而使外套防腐层的温度控制得到了保证。用保温材料包扎多层铝箔反射层，有效减少了热损失，使蒸汽管道更加经济合理。
The inner steel pipe shall be coated with two-layer inorganic zinc rich primer (temperature resistance ≥ 400 ℃), and the pipe end shall be sealed with polyethylene film or three-layer PE cold wrapping tape to prevent moisture entering before installation or water entering during construction. The heat loss is effectively reduced by multi-layer staggered seam wrapping of thermal insulation material. At the same time, the measures to control the surface of the jacket prevent the generation of cold bridge, thus ensuring the temperature control of the coating. The multi-layer aluminum foil reflective layer wrapped with thermal insulation material can effectively reduce the heat loss and make the steam pipeline more economical and reasonable.
外套钢管防腐采用防腐涂层与阴极保护联合防护，使防腐寿命可大大增加。疏水系统采用全封闭的形式，布置灵活，结构合理，可靠。钢套管上的排潮管既能及时排出潮湿气体，又可作为日常运行的报警信号管。管道的热补偿采用波纹管补偿器，并将其装设在套管内，做成直埋形式，无须设置观察井，施工操作方便、工期短。
The anticorrosive coating and cathodic protection are combined to protect the outer steel pipe from corrosion, which can greatly increase the anticorrosion life. The drainage system adopts fully enclosed form, flexible layout, reasonable structure, safety and reliability. The moisture discharge pipe on the steel sleeve can not only discharge the wet gas in time, but also be used as the alarm signal pipe for daily operation. High quality bellows compensator is used for thermal compensation of pipeline, which is installed in casing and directly buried without observation well.
高温直埋式预制蒸汽保温管常用规格/单位：mm
Common specification / unit: mm for high temperature directly buried prefabricated steam insulation pipe
