The PL Flange connection should be kept on the same axis, the bolt hole center deviation should not exceed 5% of the hole diameter, and the bolt should penetrate freely. The connecting bolts of PL Flange should have the same specifications, the installation direction should be the same, and the bolts should be tightened symmetrically and evenly.

Angled washers of different thickness should not be used to compensate for the non-parallelism of the PL Flange. Do not use double washers. When the large-diameter gasket needs to be spliced, it should not be butted with the flat port, but should be in the form of a diagonal lap or a labyrinth.

In order to facilitate the installation and disassembly of PL Flange, the fastening bolt and PL Flange surface shall not be less than 200 mm.

When tightening the bolts, they should be symmetrical and intersected to ensure that the gasket is evenly stressed.

Direct burial of PL Flange connections is not permitted. The PL Flange connection of the buried pipeline should have an inspection well. If it must be buried, anti-corrosion measures should be taken.