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How does the seal gasket be selected?

Update:05 Feb 2018
Summary:

(1) Determine the standard used for sealing gaskets Gen […]

(1) Determine the standard used for sealing gaskets
Generally speaking, the standard of sealing gasket is the same as that of flange. The usual standards are China National Standard (GB), mechanical industry standard (JB/T), chemical industry standard (HG), international standard (ISO) and so on.
(2) Determine the nominal diameter and nominal pressure of the sealed gasket
The nominal diameter and nominal pressure of the sealing gasket are the same as that of the flange. Such as: DN100-PN2.5.
(3) Determine the category of sealed gasket
According to the nominal pressure and the maximum temperature of the medium to determine the type of gasket used. They are mainly divided into flexible graphite, polytetrafluoroethylene, rubber, asbestos free gaskets, spiral gaskets, corrugated gaskets, elliptical mats, and octagonal pads. As asbestos gaskets are phased out for environmental and health reasons, this article is not recommended.
(4) Determine the form of sealed gasket
The form of the gasket is mainly divided into four kinds: non metal cushion sheet, winding cushion, metal composite cushion and metal pad. The form of the concrete gasket should be selected according to the flange form and the technical parameters provided by the manufacturers.
(5) Determine the material and model of the seal gasket
The material of the sealing gasket should be determined according to the temperature, pressure and corrosion performance of the medium, and then the type of the gasket should be determined according to the above content. The model of the gasket generally consists of six parts: the form of the gasket, the material, the nominal diameter, the nominal pressure, the standard number, the manufacturer or the brand.

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