Ductile Iron Pipe And Steel Pipe Docking Method

The ductile iron pipe is connected by the socket, and the steel pipe is generally welded, and the outer diameter and the inner diameter of the pipe are inconsistent, so a special method is required for the connection operation. As a DI Flanged Pipes Manufacturer, there are two main methods we currently use:

1) Flange connection

This method is a universal connection method. The principle of this method is that the ductile iron pipe and the steel pipe are both converted into a flange interface, thereby realizing standard docking.

Ductile iron pipes have two types of standard pipe fittings, which are respectively a short bearing tube and a short tube.

The socket or socket of the pipe fitting can be connected to the normal Yajie pipe, so that the pipe can be converted into a flange interface, and only need to be connected with the corresponding steel flange.

The characteristic of this method is that the connection method is relatively common, and the flange is made as a standard part to ensure the stability of the connection. It should be noted that the flanges of both sides need not only the same nominal value, but also the PN value should be consistent.

The disadvantage of flange connection is that if it is directly buried, the risk of bolt corrosion is high, and problems such as water leakage at the interface may occur in the future. Some design specifications also require that the bolt cannot be buried directly. In addition, the flange connection ensures the sealing effect by bolt fastening, and the influence of manual operation is large.

2) Socket connection

The socket connection method is to ensure that the connection position is the socket for the ductile iron pipe (if not, the double socket is used, so that the socket end is converted into the socket end), and the steel pipe end is welded with an additional layer at the outer diameter of the socket. The steel plate makes the outer diameter of the steel pipe the same as the outer diameter of the ductile iron pipe. The steel pipe is then inserted into the socket of the ductile iron pipe for installation.

The advantage of socket connections is that there is no risk of corrosion of the bolts buried. However, for a large-diameter pipe, the wall thickness of the steel pipe is thin, and at the same time, the steel pipe protrudes from the well chamber, and the radial deformation of the steel pipe may be excessive due to the settlement of the well chamber, thereby having the risk of water leakage at the interface.

Our company also offers PUR Coating Ductile Iron Pipe. Welcome to contact us.