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Gaskets: Types and Features [980]

For years, many different types of gasket have been used to seal bolted connections. It can be defined as a device for sealing two surfaces, by storing energy between them. Therefore the gasket has to react to the forces generated by the bolts, and hence the work and energy imparted to the bolted joint becomes ‘stored’ within the gasket itself.

 

Gaskets should essentially fulfill the following criteria:

  • Limited relaxation
  • Good face adaptability and compressibility
  • Good recovery
  • Strength
  • Chemical resistance
  • Temperature resistance

 

Features:

  • Excellent corrosion resistance,
  • High and low temperature resistance,
  • Good compression resilience and

 

Gaskets can broadly be classified into three main categories:

 

  • Metallic & Semi-Metallic Gaskets
    Metallic or semi-metallic gaskets consist of metal or a combination of metal parts and non-metal parts. These gaskets are suitable for high and medium pressure applications. Metallic gaskets require a much greater quality of the sealing surface than non-metallic gaskets.
    • Corrugated metal gaskets: high sealing pressure at the metal corrugation, high blow out resistance, in case of metal to metal, a perfect flange surface is required.
    • Metal jacketed gaskets: good shelve life, robust, can be handled and installed without special care, requires a good flange surface because of metal to metal sealing, wide range of shapes.
    • Ring joints: very safe and reliable sealing system; will be always applied, when unreceptive media or explosive gases are involved; risk in the choice of ring joint material: the ring joint material must be softer than the flange material but the hardness of the flange material is normally not indicated metal to metal sealing; requires therefore good flange surface
    • Spiral wound gaskets: multipurpose gasket, can be easily removed, requires no special care during handling and installation, good resilience because of the V-shaped metal strips and has a good shelve life.

 

  • Non-Metallic Gaskets
    Non-metallic materials are used in low to medium pressure applications usually up to nominal pressures of 40 or 63 bars on the raised face and up to 200 bars in tongue grooved flanges.
    • Fibre reinforced gaskets: cheap and good availability, easy to cut/punch to size, limited in temperature resistance due to the rubber binder F
    • graphite gaskets: can follow easy any flange irregularity, no creeping, no resistance in oxidizing environments
    • PTFE gaskets: very dense sealing material, adapts perfect to the flange, very good chemical resistance, limited temperature resistance, creeping
    • Rubber gaskets: Rubber is a soft gasket material. Rubber gaskets are used in a varied range of applications such as pipe gaskets, heat exchangers etc.

 

About Author
Author represents this article on the behalf of Venus Gaskets, one of the leading Plate Heat Exchanger PartsManufacturers in Gujarat, Offers a wide range of industrial products like Industrial Gaskets, Plate Heat Exchanger Gaskets, Rubber O Rings Suppliers etc.

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