Why two-stage tightening matters

Platzhalterbild mit grauem Hintergrund, einer hellgrauen bergähnlichen Form und zwei Kreisen, die eine Sonne und einen Mond darstellen.

The numerical simulation by our flange expert Filip Wegener illustrates that the tightening sequence, in combination with gaps between the contact surfaces, can lead to a significant loss of preload. The animation clearly demonstrate that the two-stage tightening required in IEC 61400-6/AMD1 is necessary to achieve sufficient preload and that after two rounds preloading to 100% of the design preload, the losses due to this effect are negligible. Enjoy watching! 🎞️

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Platzhalterbild mit grauem Hintergrund, einer hellgrauen bergähnlichen Form und zwei Kreisen, die eine Sonne und einen Mond darstellen.

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Platzhalterbild mit grauem Hintergrund, einer hellgrauen bergähnlichen Form und zwei Kreisen, die eine Sonne und einen Mond darstellen.

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Platzhalterbild mit grauem Hintergrund, einer hellgrauen bergähnlichen Form und zwei Kreisen, die eine Sonne und einen Mond darstellen.

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Luftaufnahme von Wellen, die an die Küste schlagen und weißen Schaum vor dem tiefblauen und türkisfarbenen Wasser bilden.
Why two-stage tightening matters
Ein allgemeines Benutzerprofilsymbol mit der weißen Silhouette einer Person auf hellblauem Hintergrund.