How to connect galvanized steel pipes?

If the thread type method is used, the thread buckle cannot be in complete contact with the pipe hoop of the steel pipe, otherwise it is likely to become loose. Before connecting, it is necessary to measure whether the wall thickness of the steel pipe can reach the standard thickness of the thread. If the thread of the steel pipe does not match the thread of the pipe hoop and cannot be connected, the pipe hoop should be replaced or the equipment should be adjusted to re-thread the thread.
To connect threaded galvanized pipe, cover all the threads with pipe dope, or wrap the threads with PTFE plumber's tape. This helps in establishing a leak-proof connection. Once the connection is hand-tight, use one pipe wrench to keep the pipe steady and another to tighten the fitting