Installing the connecting flange is a crucial link in the pipeline system. Here are some things that need special attention:
First, before installation, be sure to conduct a comprehensive inspection of the connecting flange and its supporting pipes. Make sure that there are no scratches, rust, cracks or other defects on the flange surface, and that the pipe end is flat and vertical. At the same time, verify whether the flange specifications, models, pressure levels and other parameters are consistent with the design requirements of the pipeline system.
Second, it is crucial to choose the right sealing gasket. The material of the sealing gasket should be determined according to the nature, temperature and pressure of the medium in the pipeline. For example, for high temperature, high pressure and highly corrosive media, metal spiral wound gaskets may be required; for general working conditions, rubber gaskets or asbestos gaskets may be sufficient. When installing the gasket, ensure that it is accurately positioned without distortion or damage.
The selection and tightening of bolts are also key steps. The material and strength grade of the bolts should match the flange, and the number and specifications of the bolts should meet the design requirements. When tightening the bolts, the method of diagonal uniform tightening should be adopted, and the torque should be gradually increased to avoid unilateral tightening or over-tightening to avoid flange deformation or sealing failure. The tightening torque value should refer to the relevant standards or technical data provided by the manufacturer.
The installation environment will also affect the installation quality. It should be installed in a clean and dry environment to prevent dust and impurities from entering the flange sealing surface and affecting the sealing effect. If installed outdoors or in harsh environments, protective measures must be taken to prevent corrosion and damage.
In addition, when connecting flanges, ensure that the center line of the pipe is aligned with the center line of the flange to avoid eccentric connection, which will cause uneven force on the pipe and affect the normal operation of the system. For flanges that need to be welded, the welding process must meet the requirements of the specifications, and non-destructive testing must be performed after welding to ensure the quality of the weld.
For example, in a chemical project, because the installers did not follow the method of diagonal uniform tightening when tightening the bolts, the flange was unevenly stressed, and leakage occurred during the operation of the system, and the system had to be shut down for maintenance, causing great economic losses.
For example, in an electric power project, the material of the sealing gasket selected did not meet the medium requirements. After a period of operation, the gasket aged and failed, causing a leakage accident and affecting the stability of the power supply.
In summary, when installing the connecting flange, it is necessary to carefully consider and operate from multiple aspects and strictly follow the relevant standards and specifications to ensure the safe and reliable operation of the pipeline system.
