PRECISION MOULDED FLANGE GASKETS – CORRUGASKET®
Flange Gaskets – Corrugasket®: For Quality, Security and Precision Our precision moulded flange gaskets with their unique corrugated surfaces, guaranteed to give you:
- Dimensional accuracy
Each Corrugasket® is dimensionally accurate. Unlike cut or stamped gaskets, size and thickness do not vary since the gasket exactly reproduces the precise tolerances of the moulding tool.
- Concentric corrugations
The concentric corrugations across the Corrugasket’s surface act as separate sealing planes to compensate for any defects in the flange, whether through corrosion, scores or even un-machined surfaces.
- Consistent thickness (unlike stamped gaskets)
Cut or stamped gaskets are usually taken from calendared sheet material which by its very nature isn’t flat and so can lead to uneven force requirements when tightening. In its uncompressed state, the Corrugasket is 4mm thick. Optimum sealing efficiency is achieved at approximately 0.4mm compression or 3.6mm gasket thickness.
- Maximum sealing efficiency with minimum compression.
The Corrugasket’s corrugated surface not only gives exceptional sealing efficiency, it also reduces significantly the bolt-torque required to achieve an effective and long-term seal. This in turn leads to reduced compression on the gasket and to the increased life of the complete flange assembly. Our unique multi drilling design means that Corrugaskets from 50mm to 300mm are suitable for a range of pressure classes. Sizes from 350mm upwards are suitable for PN16 and the simple but effective lugs retain the gasket in position whilst the bolts are being fitted.
A – Plain edge: Sizes up to 100mm
B – Scallop edge: Sizes 125mm to 300mm
C – Locator type: Sizes 350mm and 600mm
Simply there is no better seal. The gasket design is proven in terms of faster, easier fitting, longer life and the materials used have the full acceptance of the Water and Gas authorities to the latest specifications. Corrugaskets are streets ahead of cut or stamped gaskets at every level of performance and VIP’s 100% quality control give you the ultimate guarantee.
Flange Dimensions Table:
|Nominal Pipe Bore||Gasket ID||Gasket OD||FLANGE DIMENSIONS|
|EN 1092-PN10||EN 1092-PN16||EN 1092-PN25||EN 1092-PN40|
How to install the Corrugasket®
- Align flange so that top two bolt holes are positioned evenly, one on each side of central vertical axis of flange. If using Plain edge or Scallop edge Corrugaskets, put 2-3 bolts in place at bottom of flange to act as a prop for the Corrugasket.
- Lay the Corrugasket in place with bottom edge resting bolts. On Scallop edge Corrugaskets ensure that notches on gasket fit snugly around bolt holes. Match bore of Corrugasket to bore of flange.
- On Locator type Corrugasket only, insert two bolts into holes on upper half of flange. Loop the locators on Corrugasket over the bolts to position the gasket on the flange.
- Match opposite flange face to face with gasket and insert remaining bolts. Note all bolts should be inserted from the same side. Tighten bolts as normal, using a diametrical tightening sequence, maintaining the flanges parallel at all times.
NOTE: Due to the difference in dimensions for PN25 and PN40 flanges, Corrugaskets between 125mm and 300mm are located on the bolts using the plain outer edge and not the scallops.
Manufactured from EPDM, Corrugasket® meet all EU Water specifications and when manufactured from Nitrile, meet the requirements of EN682:2002. The European Standard EN681-1 (Elastomeric seals – Material requirements for pipe joint seals used in water and drainage applications) sets the specification for elastomeric seals for joints in pipework and pipe-lines. Corrugasket® for Water applications not only meets the drainage and drinking water sections of this Standard, but in many areas exceeds the minimum requirement stipulated. For Gas applications, VIP-Polymers Nitrile compound gasket meets the requirement of BS EN682:2002 (Elastomeric seals – Materials requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids). In addition, Corrugasket® meet the following national and international standards:
BS EN 1092-1:2007 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated. Steel flanges
BS EN 681-1:1996 Elastomeric seals. Material requirements for pipe joint seals used in water and drainage applications. Vulcanized rubber
BS EN 682 Elastomeric seals – Material requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids.
ISO 3302-1:2014 Rubber – Tolerances for products — Part 1: Dimensional tolerances
BS 6920-1:2014 Suitability of non-metallic materials and products for use in contact with water intended for human consumption with regard to their effect on the quality of the water.