Introduction to common faults of flanges

Flanges play an important role in connecting pipes, but due to various factors, flanges may also have some common faults. The following are some common flange faults and their possible causes:

Poor flange sealing:

Phenomenon: Leakage at the flange connection.

Possible causes: Uneven flange surface, aging or damage of the gasket, loose flange bolts, etc.

Solution: Check and clean the flange surface, replace the gasket, and tighten the bolts.

Oil leakage around the flange:

Phenomenon: Oil stains appear around the flange.

Possible causes: Same as poor flange sealing, including uneven flange surface, aging or damage of the gasket, loose flange bolts, etc.

Solution: It is also necessary to check and clean the flange surface, replace the gasket, and tighten the bolts.

Flange bolts broken:

Phenomenon: The bolts at the flange connection are broken.

Possible causes: Poor quality of bolt material, insufficient bolt preload, and uneven flange surface.

Solution: Replace good quality bolts, correctly preload the bolt force, check and clean the flange surface.

Rusty at the flange connection:

Phenomenon: Rust appears at the flange connection.

Possible causes: humid environment, moisture contamination, poor material quality, etc.

Solution: Check and clean the flange regularly, use good quality flange materials, and take appropriate anti-rust measures.

Weld defects:

Phenomenon: There are defects in the weld of the stainless steel flange, such as cracks, pores, etc.

Possible causes: improper welding process, poor material quality, etc.

Solution: Improve the welding process, use good quality welding materials, and conduct strict weld inspection.

Flange sealing surface damage:

Phenomenon: Scratches, pits and other damages appear on the flange sealing surface.

Possible causes: improper operation during installation, medium corrosion, etc.

Solution: Repair the damaged sealing surface or replace the new flange.

Eccentric installation of flange gasket:

Phenomenon: The gasket is not concentric with the flange, resulting in poor sealing.

Possible causes: improper operation during installation.

Solution: Reinstall the gasket to ensure that it is concentric and coaxial with the flange.

Flange connection bolts do not meet the requirements:

Phenomenon: The bolt specifications for tightening the flange do not match or are improperly installed.

Possible causes: improper bolt selection or negligence during installation.

Solution: Select bolts that meet the requirements and tighten them according to the correct installation method.

In addition, there are some other possible faults, such as flange connection dislocation, flange deformation, etc. The occurrence of these faults may be related to various factors such as material quality, installation process, and use environment. In order to prevent the occurrence of these faults, strict quality control measures, correct installation methods, and proper maintenance are required.