Flange nominal pressure introduction

The nominal pressure of a flange is a key parameter used to indicate the maximum pressure that a flange can withstand under specified operating conditions. The following is a detailed description of the nominal pressure of the flange:

First, definition

The nominal pressure of the flange, also known as the rated pressure of the flange, refers to the maximum pressure that the flange can withstand on the basis of the specified bolt material or gasket. This pressure value is usually determined at a specific temperature (such as 20 ° C or 200 ° C) and takes into account the mechanical properties of the flange material.

Second, common value range

The common numerical range of the nominal pressure of France varies depending on the type of flange, the material, the working environment and other factors. In general, common nominal pressure values include PN10, PN16, PN25, etc., as well as other values in MPa, such as 0.1MPa, 0.25MPa, 0.6MPa, etc. In addition, in the American flange system, the nominal pressure is often expressed in psi, such as 150psi, 300psi, etc.

Third, the selection basis

The nominal pressure of flange should be selected according to the pipeline working pressure, medium properties, environmental temperature and other factors. In general, the nominal pressure of the flange should be slightly higher than the working pressure of the pipeline to ensure the safety of the pipeline system in extreme circumstances. At the same time, it is also necessary to consider the corrosion of the medium, temperature fluctuations and other factors on the sealing performance of the flange.

Fourth, the relationship with work pressure

Nominal stress is not equal to work stress, but greater than or equal to work stress. Working pressure refers to the maximum continuous operating pressure acting on the inner wall of the water supply pipeline under normal working conditions, excluding the fluctuating pressure of water. The nominal pressure is a nominal pressure that is artificially prescribed for the convenience of design, manufacture and use, which represents the maximum pressure that the flange can withstand under the specified operating conditions.

Fifth, precautions

When selecting the flange, it should be ensured that the nominal pressure of the selected flange meets the pressure demand of the pipeline system to ensure the safe and stable operation of the system.

The nominal pressure of the flange is closely related to the size of the flange, the structure type, the sealing surface type and other factors, so the comprehensive influence of these factors should be considered when selecting the flange.

In actual use, the flange should be checked and maintained regularly to ensure that its sealing performance and pressure capacity meet the requirements.

To sum up, the nominal pressure of the flange is an important parameter in the flange connection, which is related to the safe and stable operation of the pipeline system. When selecting and using the flange, the meaning of its nominal pressure and the basis for selection should be fully understood to ensure that the selected flange meets the actual needs of the system.