|
The inner tubes are continuously welded and corrugated using the Uniwema (TIG welding) process. The outer surface of the inner tube is cleaned through a continuous process, while the superinsulation and the spacers are mounted around the tube. The outer tube is then formed, welded and corrugated around the inner tube in a subsequent continuous process.
The length of the continuously produced tube is theoretically unlimited. Individual lengths are cut as required in the order. Because of evacuation restrictions lengths are limited to 100 m. In the next step, the stainless steel termimations are welded to the line ends. All welding operations are done through TIG welding.
All tubes are helium leak-tested with a sensitivity of 10-9 mbar I/sec. Following the leak test, the vacuum space is pumped down to the operation vacuum level and properly sealed.
The vacuum integrity is guaranteed for two years as a result of the high degree of cleanliness observed during production and from the use of a specially selected getter material inside the vacuum space.
   
|
