These bellows are used in installation of glass equipment for following purposes :
1. to provide safe branching of pipelines from the main glass equipment.
2. to accommodate odd degrees and variation in length.
Bellows are supplied alongwith required bellow flanges and nut-bolts. Distance-locking bolts are provided to avoid excessive compression or contraction of the bellow. Gaskets are not required where bellows are used. For drilling details, refer "Bellow flanges".