1. Threaded connection

The automatic threading machine shall be adopted for the threading, and the current national standards shall be implemented.

2. Flange connection

One-time installation method: it can measure and draw the single-line processing drawing of the pipeline on the spot, process the coating and plastic lining, and then arrive at the site for installation.

Secondary installation method: Non-coated, plastic-lined steel pipes and fittings can be used on-site, flanges are welded, pipes are assembled, then disassembled for coating and plastic-lined processing, and then shipped to the site for installation.

3. Groove connection

Finished grooved plastic-coated fittings should be used first; grooves should be grooved with special roll groovers, and the groove depth should comply with relevant standards.