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目前我公司生产大口径管中管,其外径为φ520mm聚乙烯护管,内层为φ426mm螺纹钢管,两管之间浇注聚氨酯硬质泡沫塑料保温层。管中管的质量达到了设计要求。这种管线和其它管线相比,具有保温性能好,使用寿命长等优点。管中管在工厂预制时要保证质量,在现场补口施工的质量也需严格要求,达到设计质量标准是比较棘手的问题。所以,我们针对多个
At present, our company produces large diameter tube in the tube, its outer diameter is φ520mm polyethylene protective tube, the inner layer is φ426mm threaded steel tube, pouring polyurethane rigid foam insulation layer between two tubes. The quality of the tube in the tube meets the design requirements. Compared with other pipelines, this pipe has the advantages of good thermal insulation performance and long service life. Tube in the factory prefabricated to ensure quality, fill in the site construction quality also need to be strict with the requirements, to meet the design quality standards is a more difficult issue. So, we are targeting more than one