Spiral wound gaskets

Reliable sealing at medium and high pressure

Definition and basic characteristics of spiral wound gaskets

The spiral wound gaskets are sealing elements designed for high pressure and temperature services, They are particularly effective in demanding working conditions. They consist of a metal strip with a V-shaped central rib which is wound in a spiral, leaving between its spires a filling material providing the sealing.

This spiral design combines the mechanical strength of metal with the sealing capability of the flexible material, The basic configuration can be added to the basic configuration to achieve effective sealing even in extreme conditions. To the basic configuration can be added inner and/or outer rings which protect the filler material, center the gasket on the flange and limit its compression.

At Epidor, In addition, we can manufacture spiral wound gaskets to order, We adapt to special geometries as well as to specific technical requirements of pressure, temperature and type of fluid.

High-performance metal sealing for demanding environments

At Epidor, we offer a wide range of spiral wound gaskets, specially designed for applications of medium and high pressure, where a combination of mechanical strength, leak tightness and tolerance to extreme temperature and fluid conditions is required.

These seals are manufactured using the spiral winding of a metal strip in a V-shape, which incorporates between its coils a filling material. This design ensures that the filler provides sealing and that the metal strapping provides structural rigidity.

They can reach temperatures in excess of 500 °C, and even more in specific configurations, and work with high pressures, making them a versatile solution for harsh environments.

Structure and materials available

The choice of material for the backfill and of the metal strapping allows the spiral wound seal to be adapted to different process conditions:

Typical filler materials

Graphite
PTFE (polytetrafluoroethylene)
Mica
Other asbestos-free materials, depending on application

The graphite, is one of the most widely used for high temperatures due to its thermal resistance.

Metal strapping materials

Stainless steel (various grades such as 304, 316L, 321, etc.)
Carbon steel
Special alloys (Hastelloy, Inconel, Monel and Titanium, among others)

Depending on the fluid, pressure or service conditions, these may include inner and/or outer metal rings to improve performance.

The metal rings also act as compression limiters of the filler material, as well as providing stability and facilitating flange mounting. In particularly sensitive applications, the The inner ring is made of the same material as the strap., The system is designed to ensure chemical compatibility with the process fluid and to minimize internal stresses.

Types of spiral wound gaskets

At Epidor, We have different models of circular geometry, according to the requirements of the application:

R: Spiral-metal core without additional accessories. Compact and simple.
RI: With inner ring, acts as a compression stop and protects the backfill from erosion and process fluid attack.
CC: With outer ring, The flange is centered on the flange and the compression is limited.
CCR: With inner and outer ring, for maximum protection, centering and tightening control.

We also supply other designs and special geometries on request, as gaskets elliptical, oval, rectangular or diamond-shaped, manufactured to drawing.

How to select the most suitable type of spiral wound gasket?

The choice of spiral wound gasket type depends on several factors such as process pressure and temperature, chemical compatibility with the fluid, flange surface condition and ease of installation.

For example, if self-centering and compression limiting are required, an outer ring seal (CC) is recommended. For corrosive media or high temperatures, an inner ring seal (RI or CCR) will provide greater safety and durability.

At Epidor, Our technical team can help you define the best configuration for your application.

Compatibility with international standards

Our spiral wound gaskets are available from stock for standard flanges according to:

EN 1092-1 / EN 1759-1
DIN 2632 ... DIN 2638 / DIN 2627... DIN 2629
ANSI / ASME B16.5 / ASME B16.47 Series A / ASME B16.47 Series B
API 605
BS 1560

And they comply with the following regulations:

EN 1514-2
ASME B16.20
BS 3381
API 601

This allows rapid adaptation to existing systems in different industries, such as petrochemical, power generation, chemical or refineries.

Typical thicknesses

Spiral wound gasket thicknesses are not standardized, being the most common:

3.2 mm
4.5 mm
6.5 mm

Other thicknesses available upon request.

Spiral wound gaskets FAQ's

When is it recommended to use an inner or outer ring?

The inner ring is used for protect the filler against erosion. The outer ring acts as a centering device and compression stop, ensuring proper installation. Both are recommended in critical applications.

Which materials are suitable for aggressive environments?

For aggressive or corrosive media, we recommend materials such as graphite for backfilling and nickel or titanium alloys for the metal strap. The use of compatible materials between the inner ring and the strap can improve internal corrosion resistance.

Are there spiral wound gaskets with non-circular shapes?

Yes, in Epidor we manufacture custom gaskets with special geometries such as elliptical, rectangular or diamond-shaped, adjusted to the customer's needs.

Do you need spiral wound gaskets for your project?

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