These bellow are used in installation of glass equipment for following purpose :

• to provide safe branching of pipelines from the main glass equipment.
• to accommodate odd degrees and variation in length.

Bellows are supplied along with 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”

Line bellow
These can withstand a temperature of 200ºC under normal atmospheric conditions

Cat.Ref.	DN	D	D1	D2	L
FBN1*	25	95	41	31	60
FBN1.5*	40	105	56	43	65
FBN2*	50	120	69	55	65
FBN3*	80	155	98	82	65
FBN4*	100	200	132	111	65
FBN6*	150	275	184	162	65
FBN9*	225	350	258	230	65
FBN12	300	420	340	308	65

Vacuum bellows
For pipeline of 80DN and operating under vacuum the bellows are provided with an internal sleeve which supports the convolutions without affecting the flexibility of the bellow. These bellows can withstand a temperature of 200ºC under full vacuum.
For size upto 50DN, line bellows can be used for these applications.

Cat.Ref.	DN	D	D1	D2	L	L1	t
VB3*	80	155	98	82	70	5	3.0
VB4*	100	200	132	11	70	5	3.5
VB6*	150	275	184	162	70	5	4.0
VB9*	225	350	253	230	70	5	5.0
VB12*	300	420	338	308	70	5	5.0