The main precautions for flange installation are as follows:
1) Before installing the flange, the sealing surface and gasket of the flange should be inspected and confirmed to ensure that there are no defects that affect the sealing performance, and the protective grease on the flange sealing surface should be removed;
2) The bolts connecting the flange should be able to freely penetrate;
3) The installation direction and exposed length of flange bolts should be consistent;
4) Tighten the nut by hand to ensure smooth rotation on the screw;
5) The flange installation cannot be skewed, and the parallelism of the flange sealing surface must meet the specification requirements.