Kammprofile Gaskets

Kammprofile gaskets are used in the most demanding environments, such as refineries, chemical and petrochemical plants, nuclear power plants, etc. The load stability of Kamprofile or Camprofile gaskets is notably superior to flat gaskets, and ensures sealing against high temperatures, pressure, and situations requiring high bolting forces.

At Comdiflex, we can manufacture gaskets from DN 10 up to a diameter of 3600 mm. For specific cases, larger meters or special fabrications according to drawings, such as oval seals or other geometric shapes.

We manufacture with a metallic core (generally stainless steel), with concentric grooves on both sides of the gasket and slightly convex profile, which allows to achieve the maximum sealing point with the contact surfaces. It adapts perfectly to the roughness of the flange face and its irregularities.

Our Kamprofile gaskets have an excellent capacity to withstand high pressures and variations, as well as temperatures up to 1000ºC depending on the type of material used for their manufacture.

Kamprofile gaskets are recommended for application in: Heat exchangers and valves, pressures above 250 bar, for damaged flanges, and are designed for oil, steam and hydrocarbon applications in aggressive environments.

*Recommended surface finish for the flange surface.
(1) A.F.: Compressed cardboard sheet with binder.

In order to avoid damage to the flanges with the metal core of grooved gaskets, they are generally used with layers of graphite, PTFE, aluminium or silver, providing total protection to the flanges and a secure seal even at low minimum surface pressures.

A triaxial stress is created in the profiling of the metallic carrier which has been filled with the layer material. The stability of this combination is therefore significantly higher than with a pure PTFE, graphite, or aluminium seal.

However, the main purpose of soft coatings is not the protection of the flange seating surface, but the reliable sealing of the flange connection with minimum surface contact pressures sV. A triaxial stress state is generated in the recesses of the toothed profile, which are filled with the lining material. The maximum permissible load sV that the gasket can withstand is up to the elastic limit of the groove profile core or the flange material. Therefore, the stability of this gasket is far superior to the classical flat gasket and the typical jacketed (metal-plastic) gaskets.

In the standard profile of the toothed joint, designed according to DIN EN 1514-6, the peaks and grooves are flush. The thickness of the coating is recommended to be 0.5 mm and in case of PTFE 0.35 mm.

The concave kammprofile seals according to profile B27A, B29A, B25A and E27A are distinguished by an improved sealing behavior compared to the standard profiles B7A, B9A.

This improvement is achieved by reducing the depth of the grooves (“notched”) towards the center of the notched profile.

Therefore, the sealing coating (soft and plastically deformable) takes on a greater consistency and density (more thickness) in the center of the profile than at both ends of the profile; as a result, the bolt load is concentrated in the center of the profile rather than at the ends, so that the penetration of the coating is particularly optimal in the inevitable unevenness and roughness of the flange surface.

Thus, the stability of the concave grooved profile, due to its high central specific pressure, is very high and superior to all other standard flat profiles.

Also the surface pressure in the center of the profile has a positive effect on the sealing behavior of the gasket against slightly misaligned flanges.

The maximum allowable stress under temperature v is sV and determines the “stability” of the gasket. This value is determined by the metallic material of the profile.

Whereas in normal gaskets, with a strong inclination of the flange (at ” 1º) a detachment of the inner diameter of the gaskets is observed, because now the flanges act with greater force on the outer diameter of the gasket.

The materials for the coatings are PTFE, graphite and in special cases, aluminum, silver.

The soft material coatings are usually supplied glued to the gasket. Therefore, the gasket in the assembled state gains some thickness.

For the coating of gaskets for pipes, apparatus elements or fittings we recommend the use of PTFE or graphite. The coatings can be added without gluing or a low chloride glue can be used.

For metal coatings, in narrow joints, bD < sqrt(d1), the toothed joint can be partially coated on the inside (see graph below), with good results.

For wide joints, bD > sqrt(d1), the joint can be fully surfaced (in two parts), as shown in the figure below.

Preferred use of Kammprofile gaskets according to profile:

• B27A without centering ring, especially suitable for tongue and groove flange connections.
• B29A with centering ring that helps to correctly position the gasket between the bolts, for flanges with shoulder or smooth flanges.
• B25A with removable and retrievable centering ring for another gasket. Reduces the replacement costs of these gaskets, especially suitable for larger dimensions.

WE ARE MANUFACTURERS OF KAMMPROFILE GASKETS

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