The influence of the sealing surface of the flange seal

The influence of the sealing surface of the flange seal

The shape and roughness of the flange sealing surface should match the gasket. The flatness of the sealing surface and the perpendicularity between the sealing surface and the flange axis are the prerequisites to ensure the uniform compression of the gasket. Therefore, the reasoning or the influence of eccentric force caused by the thermal expansion of the pipeline must be considered during the design and installation. Otherwise, it will easily cause the flange to be tightly sealed and cause leakage.

Influence of gasket performance of flange seal

The gasket deformation includes elastic deformation and plastic deformation. The gasket material is the main factor affecting the performance of the gasket, so the quality of the gasket will affect the sealing of the flange.

Influence of bolt pre-tightening force of flange seal

Increasing the pre-tightening force of the bolts can increase the sealing performance of the gasket, but if the bolts and spirits are too large, the gasket will lose its elasticity, and even crush the gasket or the foundation, which cannot guarantee sufficient elasticity under working conditions. .

The influence of the coefficient of flange sealing and compression ratio

The influence of gasket coefficient and compression ratio in design parameters. China currently chooses the two parameters through the look-up table "Steel Pressure Vessel", but the gasket coefficient and compression ratio, even if it is the same material, the two coefficients are also related to the gasket width, pre-tightening pressure, medium performance, flange The width of the sealing surface is related to the roughness and other factors. Therefore, there is no authoritative specification to choose how much the two coefficients should be.

The influence of the operating conditions of the flange seal

Operating conditions are pressure, temperature, and physical and chemical properties of the medium. In petrochemical plants, there are many low-pressure flanges, and the influence of simple pressure or medium factors on flange leakage is often not the main one. Only when combined with temperature does the problem become serious. When the temperature changes repeatedly, the possibility of seal failure is greater.

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