FW-FERNWÄRME-TECHNIK GmbH is constantly developing the steel-in-steel pipeline system for more than 30 years.
Based on the double-pipe-system which was first invented in 1906 these FW-developments included for example the vacuum monitoring system in the ring space, leak proof closings under vacuum, thermal pre-stressing and latest a new Pipe-in-pipe solution for the safe transport of LNG.
The combination of knowledge and experience in steel-in-steel and the continuous research and development led to this achievement in regards of the different demands for special pipelines for the safe transport of LNG.
The presentation will show the difference regarding the thermal-flow between above- and underground pipelines which results to diverse requirements of the construction materials, insulation material and the design for components for steel-in-steel LNG transport lines. This also shows that for different projects different aspects have to be taken into account and there is not the ONLY-ONE-AND-RIGHT way of building steel-in-steel pipelines but the existing circumstances and needs have to be considered. These needs will be explained on three examples: First a short line, second siphons and finally a long line. Another major point of course is the security-aspect for certain projects. Sometimes the monitoring vacuum system and in case of incidence a well proven leak detecting system is sufficient. But there are pipelines with a much higher demand of security, for example earth-burried pipelines for the transport of LNG. For those kinds of security-demands FW-FERNWÄRME-TECHNIK GmbH developed a system with “riding chambers” on the inner pipe and will explain this latest development on steel-in-steel pipe-systems.