Reducers are used to connect pipes of different sizes; Generally, it is divided into concentric reducer and eccentric reducer. When the projection of the two ports of the reducer is concentric, it is called concentric reducer, and the projection of the eccentric reducer is a small circle cut in the outer circle.

Principle of reducing pipe selection

1. The selection of reducing pipe refers to the reasonable determination of the temperature and pressure grade of reducing pipe and the connection form of reducing pipe according to the pipe level (class), design conditions (such as design temperature and design pressure), medium characteristics, material processing technology performance, welding performance, economy and use.

2. The selection of reducers should comply with the corresponding standards and specifications, such as "General Principles for the Selection of Petrochemical Pipeline Design Equipment" (SH3059), "Industrial Metal Pipeline Design Code" (GB50316), etc.

3. The connection forms of reduced pipe are various, and the corresponding structure is also different. There are four kinds of connection forms, such as butt welding connection, thread connection, socket welding connection and flange connection.

According to the general practice, the pipe DN50 and above adopts butt welding to connect the reduction pipe, and the pipe DN40 and below adopts simmer bending, socket welding or taper pipe thread to connect the reduction pipe. When using butt welding to connect the reduced pipe, the pipe list number of the reduced pipe should be consistent with that of the connected pipe according to the principle of equal strength.

Selection of reducers

1. Compared with the branch pipe connector, the choice of reducer is not so complicated. Also according to the principle of equal strength, the reduced pipe shall have the same pipe list number as the pipe to which it is connected.

2. The choice of concentric reducing pipe or eccentric reducing pipe should be determined according to the requirements of process flow chart or piping layout. For example, the horizontal reduction pipe placed on the pipe gallery is usually the bottom of the eccentric reducer, the pump inlet pipe usually chooses the eccentric reducer, is the top flat or the bottom flat needs to depend on the specific situation.

3. Usually, butt welding reduction pipe is used for the reduction pipe on the pipe with DN≥50mm, while socket welding reduction pipe hoop is used for the pipe with DN≤40mm. However, the reduced pipe on galvanized pipe should be connected by thread.

Cangzhou Shenlong Pipe specializes in the production of steel pipe and pipe fittings, including elbow, tee, reducer, etc., the product quality is guaranteed, can arrange SGS inspection, is the first choice for some large projects.