A district heating tube can be built out of pre-insulated tubes without a bellow balancer or an expansion angle, in case that it has first been checked that the tubing remains without tension at temperature of +70 Celsius degrees. This kind of system is called a fixed system. However, the implementation of the system can be difficult during installation. The excavation needs to be kept open, until the district heating tube is warmed up to the ideal attaching temperature. Maintenance of the temperature causes problems particularly during winter as the temperature of the heating network has to remain on a higher level. Fiellberg Slide Tube brings an alternative and easy solution to the problem. By using the slide tube, the district heating tubing can be built, covered and deployed in the traditional way. When deployed the tube takes its optimal and final position automatically during the thermal expansion.


At the end of February 2018, we achieved a recognised quality milestone. The management system of Fiellberg Oy and Fiellberg Fluid Technologies (Dalian) Co., Ltd. was certified by DNV GL. We are happy to present our brand-new certificate according to ISO 9001:2015. This certificate highlights our excellence in quality!


The year 2017 was a great success at Fiellberg Oy. We have now operated for two years and during our second fiscal year we have managed to triple our sales while keeping good profitability. As we have expanded our cylinder manufacturing, we now have production in three countries: Finland, China and Poland. We want to thank all of our customers and partners for being part of this!