Flange Fixing Technology

Mating flange with raised face or recess

The fixing of the expansion joint needs to be performed in keeping with specific rules in order to assure reliable sealing of the flange connection. Rubber expansion joints with swivel flanges maybe installed on raised-face or flat-face mating flanges.

Caution shall be taken that sealing bead sits in full width on the raised face surface to avoid cutting into the rubber bulges when torqueing.

Flange Fixing Illustrations

Backing flange construction

The swivel backing flanges can be made with or without support collars and can be used to simplify the installation of the expansion joint for misaligned flange bores. Standard sizes are offered up to a nominal diameter of NB1200. For larger dimensions, the costs associated with turning the groove into the steel flange rise sharply, but can be offered on request. Backing flanges will always be delivered in a one-piece construction.

Universal Rubber Expansion Joints

Universal expansion joints are installed in piping systems that are anchored on both sides of the joint. This construction represents the most cost-effective arrangement when used in rigid piping systems with main anchors and numerous guides at specific spacing. They come as cylindrical, single, or multiple arch expansion joints with full faced rubber flanges, swivel flanges or as slip-on sleeves.

Cylindrical, single or multiple arch wall penetration seal

 200 to 4,000 mm  6,000 x 3,000 mm
standard 150 to 250 mm

up to 2.50 bar
with external pressure stability

up to 200°C

Flange standard
DIN , EN , ANSI , AWWA , BS , JIS or customized

Rubber belt between turbine neck and condenser

up to 1.50 bar

up to 140°C

clamped fixing

Elastomer or multilayer fabric ducting expansion joints

custom face-to-face

up to 0.25 bar

up to 400°C

self-sealing flanges with single or multi-part backing flanges

Disc bellows with custom number and depth of folds

 100 to 4,000 mm

up to 200°C

sleeve ends or flanges