Grooved pipe fitting is a new type of steel pipe connection pipe fitting, also called clamp connection, which has many advantages. Grooved pipe fitting connection, as an advanced pipeline connection method, can be either exposed or buried, that is, there are steel joints and some Flexible joints, so it has a wide range of applications. The mechanical tee has the same function as the ordinary tee. The mechanical tee is divided into a grooved mechanical tee and a threaded mechanical tee. A hole is drilled on the steel pipe, and then the mechanical tee is inserted into the hole, and the surrounding of the hole is sealed by a sealing ring along the pipe wall.

"Technical Specifications for Fire Water Supply and Hydrant Systems" GB 50974 12.3.12-6 stipulates that the connection between the water distribution main pipe (standpipe) and the water distribution pipe (horizontal pipe) should be grooved pipe fittings, and mechanical tee should not be used. However, the mechanical tee can be used to directly connect the branch pipe on the steel pipe. It has many applications in the installation of fire pipelines and sprinkler pipes. When it is necessary to divide or merge, the mechanical tee can be used.

Our country successfully developed grooved pipe fittings in 1998, which were soon adopted in engineering. At present, the technology is mature and has been widely used in production, domestic water supply and fire hydrant systems. Its advantages are convenient construction and maintenance, and good strength and sealing performance. , occupies small space, beautiful and so on. During the construction of grooved pipe fittings, the grooves and openings of the pipeline should be processed by a special rolling groove machine and a hole opening machine.

The application of grooved pipe connection technology makes the complex pipeline connection process simple, fast and convenient, making the pipeline connection technology a big step forward. The mechanical tee is opened on the straight pipe and can be stuck with the mechanical tee steel card. The main pipe is the whole section, the branch pipe is a single root, and the engineering quantity is one tee (mechanical thread tee), or one tee +1 steel clip (mechanical clamp tee); ordinary grooved tee, three pipe sections are connected by grooved tee; the engineering quantity is 1 tee and 3 steel clips.