Connection methods of galvanized steel pipes and issues that need attention

First, what are the connection methods of galvanized steel pipes
When using galvanized steel pipes, usually not only one galvanized steel pipe is used. Sometimes two or more galvanized steel pipes need to be connected for use. This requires the correct connection method. So how many connection methods are there for galvanized steel pipes?
1. Welding connection
It is common to connect two galvanized steel pipes by welding. This method is time-consuming, but the overall quality is relatively good, and it is not easy to leak after welding.
2. Clamp groove connection
Clamp groove connection is a popular connection method with convenient construction. You only need to process the grooves of the two steel pipes and then connect them with clamps. However, this connection method has high requirements for the quality of the clamps.
3. Flange connection
This method is to fix two galvanized steel pipes on a flange respectively, and then fix the two flanges. A flange connection is generally used at the connection valve. In addition, when the DN is greater than 100 mm, the galvanized steel pipe can be connected with a welded flange.

Second, what issues should be paid attention to when connecting galvanized steel pipes?
There are many issues to pay attention to when connecting galvanized steel pipes, such as:
1. Choose the appropriate connection method according to the design specification requirements and the size of the galvanized steel pipe fittings. For example, when the DN is not greater than 100 mm, you can use the clamp groove connection.
2. Before connecting the galvanized steel pipe, you must first screw the galvanized steel pipe by hand to check its tightness, and keep enough margin to tighten the pipe fittings.
3. After the galvanized steel pipe is connected, a water pressure test should be carried out to check whether there will be leakage at each connection. If there is leakage, it is necessary to mark it and re-test it after the repair is completed until the test results are qualified.
4. When welding galvanized steel pipes, it is recommended to cut off a small section of the steel pipe head before processing to avoid problems such as loose butt joints of the two steel pipes after the butt joint.