1. When polyurethane is poured, the construction environment temperature should be 10-40 C and the relative humidity should be less than 80%.

2、灌注后的硬泡聚氨酯保温层应充沛熟化后，再停止下道工序的施工。

2. The rigid foam polyurethane insulation layer after filling should be fully ripened before stopping the construction of the next process.

3、灌注后的硬泡聚氨酯保温层外表应当润滑，无明显凹陷突出。

3. The surface of rigid foam polyurethane insulation layer after filling should be lubricated without obvious depression and prominence.

钢套钢复合保温钢管保温构造根据滑动方式不同可分为两大类：

According to the different sliding modes, the thermal insulation structure of steel-jacketed composite thermal insulation steel pipe can be divided into two categories:

内滑动式：保温构造由工作钢管、硅酸铝、减阻层、微孔硅酸钙、隔热层、不锈钢紧固钢带、铝箔反射层、聚氨酯保温层、外套钢管、外防腐层组成。内滑动型保温钢管是由保送介质的钢管+复合硅酸盐或微孔硅酸钙+硬质聚氨酯泡沫塑料+外套钢管+玻璃钢壳防腐维护

Inside sliding type: thermal insulation structure consists of working steel pipe, aluminium silicate, drag reduction layer, micro-porous calcium silicate, thermal insulation layer, stainless steel fastening strip, aluminium foil reflective layer, polyurethane thermal insulation layer, coated steel pipe and external anti-corrosion layer. Inside sliding insulating steel pipe is anti-corrosion maintenance of steel pipe with delivery medium + composite silicate or micro-porous calcium silicate + rigid polyurethane foam plastic + outer sleeve steel pipe + FRP shell.

外滑动式：保温构造由工作钢管、玻璃棉保温隔热层、铝箔反射层、不锈钢紧固钢带、滑动导向支架、空气保温层、外护钢管、外防腐层组成。层构造构成。各种管件节点保温处置技术成熟，质量牢靠。

External sliding type: thermal insulation structure consists of working steel pipe, glass wool thermal insulation layer, aluminum foil reflective layer, stainless steel fastening belt, sliding guide bracket, air thermal insulation layer, external steel pipe and external anti-corrosion layer. Layer structure. All kinds of tubular joint heat preservation treatment technology is mature and the quality is reliable.

钢套钢复合保温钢管是公开直埋管道中的一种，采用没有混凝土构造的状况下也能够停止公开直埋的方式，即工作钢管的热收缩在外管内停止，从而降低了资料本钱，缩短了施工日期，并保证了供热管道的平安性，能够在不同温度环境下更平安的普遍应用，特别适用于高温蒸汽管道项目。运用温度可达好℃-450℃。管道端口普通选用聚乙烯薄膜或三层PE冷缠带密封，避免装置前或施工中进入潮气或水。保温资料多层错缝包扎，有效减少了热损失，同时在外套外表采取控制措施，避免冷桥的产生，从而使外套防腐层的温度控制得到了保证。用保温资料包扎多层铝箔反射层，有效减少了热损失，使蒸汽管道愈加经济合理。

Steel-jacketed steel composite insulation pipe is one of the open direct buried pipelines. It can stop the open direct burial without concrete structure, that is, the thermal shrinkage of the working steel pipe stops in the outer pipe, which reduces the cost of data, shortens the construction date, and ensures the safety of the heating pipeline. It can be used safely in different temperature environments, especially suitable. Used in high temperature steam pipeline project. The application temperature can reach to - 450 C. Pipeline ports are usually sealed with polyethylene film or three layers of PE cold wrapping tape to avoid entering moisture or water before installation or during construction. The multi-layer staggered seam binding of thermal insulation data effectively reduces the heat loss, and takes control measures on the outer surface of the coat to avoid the cold bridge, thus ensuring the temperature control of the coat anticorrosive layer. The multi-layer aluminum foil reflector coated with thermal insulation material can effectively reduce the heat loss and make the steam pipeline more economical and reasonable.

疏水系统采用全封锁的方式，布置灵敏，构造合理，平安牢靠。钢套管上的排潮管既能及时排出湿润气体，又可作为日常运转的报警信号管。管道的热补偿采用波纹管补偿器，并将其装设在套管内，做成直埋方式，无须设置察看井，施工操作便当、工期短。适用于保送2.5MPa、350摄氏度以下的蒸汽或其它介质，该产品用钢管做外防护层，具有强度高，不易损坏，施工检修烦琐，运用寿命长的优点。

The drainage system is completely blocked, with sensitive layout, reasonable structure and safe and reliable operation. The tidal tube on the steel sleeve can not only discharge wet gas in time, but also serve as an alarm signal tube for daily operation. High quality bellows compensator is used for heat compensation of pipeline, and it is installed in casing to make it buried directly. There is no need to install inspection wells, so the construction operation is convenient and the construction period is short. It is suitable for escorting steam or other media below 2.5 MPa and 350 degrees Celsius. The product uses steel pipe as outer protective layer. It has the advantages of high strength, not easy to damage, cumbersome construction and maintenance, and long service life.