1, carefully check the quality of flanges, bolts, nuts and gaskets before installation, carefully check the flange or interface installation, with or without bias, wrong mouth, open mouth, wrong holes and other defects.
2, the surface of the flange or sealing part must be cleaned, the surface of the gasket and the bolt, the mechanical impurities are not allowed to adhere to the thread.
3, the gasket can not be biased, should ensure uniform pressure.
4. When the nut is tightened, the applied force is uniform, and the bolt should be symmetrically evenly divided into 2~3 times to make the gasket evenly pressed.