The specifications for connecting galvanized steel pipes depend on the type of connection method, which generally includes flange connection, clamp groove connection, and welding. In actual connection of galvanized steel pipes, welding is the most commonly used method. Although welding takes longer, it offers the best quality among the three methods. Clamp groove connection is relatively convenient; after the two steel pipes are pre-processed, the grooves align, and then clamps are used to reinforce the connection point. Flange connection involves fixing two steel pipes to flanges, and then securing the flanges together, thus passively connecting the two pipes.

The following are specific issues to be aware of and measures to be taken regarding the connection specifications for galvanized steel pipes.
First, Improper Connections of Galvanized Steel Pipes:
1. Leaks, water seepage, and dampness at the pipe ends of the galvanized steel pipe.
2. Failure to re-galvanize at the weld joint between the galvanized steel pipe and the flange.

Second, Preventive Measures for Improper Connections of Galvanized Steel Pipes:
1. Choose high-quality steel pipes. Determine the connection method based on design specifications and the dimensions of the pipe fittings. Strictly adhere to the standard procedures and processes for each connection method during construction.
2. When the DN is not greater than 100 mm, galvanized steel pipes should be connected using threaded connections.
3. Before connecting the galvanized steel pipes, manually tighten the pipes to check the tightness, leaving sufficient allowance for tightening.
4. Wrap the filler evenly in a clockwise direction.
5. When the DN is greater than 100 mm, welded flanges can be used for connection.
6. After welding the flange, a second galvanizing is required. If you are unsure about the dimensions of the relevant parts, you can pre-assemble them. If there are no problems, then proceed with secondary galvanizing.
7. When connecting two flanges, they should be parallel. Do not force non-parallel flanges together.
8. Gaskets should be placed between the two connecting flanges. Their material and thickness must meet the design and construction specifications. Gaskets should be shaped with a handle before installation and should not protrude into the flange. Additionally, their edges should be as close as possible to the bolt holes. Do not install two gaskets or install them misaligned.
9. The length and diameter of the bolts used for flange installation must meet standards. The installation direction must be consistent, meaning the nuts must be on the same side.
10. After the galvanized steel pipes are installed, a water pressure test should be conducted to check for leaks at each connection. If any leaks occur, mark them and retest after repairs are completed until the test results are completely satisfactory.