INTEGRATED ELECTRO FUSION JOINT

 

A complete pipe system is always just as secure as its weakest component. The weakest component is the joint. Therefore it is important to choose the most suitable and permanent one. The welding of small diameter plastic pipes and fittings with the help of electro fusion has been a common method in the market for years. Above all this jointing technique is very favorable, simple and secure. Those are the reasons that have caused Krah to develop this technique also for big pipes. The method has been developed in conformation with to DVS 2207-1.

A fusion wire is included into the socket of the pipe. After putting the socket and spigot of the two pipes, that shall be connected, together, the wire is heated with the help of a special fusion device whereby the two pipe ends (the socket and the spigot) are welded together.

This jointing technique allows pipes to be installed in such a short period of time never achieved before. With only one welding device it is possible to install a pipeline of 72 m with a diameter of 1200 mm in between 8 hours. The installation speed is now depending on the trench works.

 

 

Fusion parameters for Krah pipes for manual input and tightening torques for pulling chain.
Send an enquiry for the parameters for bigger diameter.

 

DN/ID (mm)

Voltage (V)

Time (sec)

No. of fusion equipment

Tightening torque at the
beginning of fusion
Tightening torque for
over-tightening after 2/3 of
fusion period

500

20

900

1

50 Nm 60 Nm

600

24

1020

1

50 Nm 60 Nm

800

33

1020

1

55 Nm 65 Nm

1000

40

1080

1

55 Nm 70 Nm

1200

43

1260

1

60 Nm 70 Nm

1400

28

1020

2

60 Nm 70 Nm

1500

32

1020

2

65 Nm 75 Nm

1600

32

1080

2

65 Nm 78 Nm

1800

40

880

2

75 Nm 90 Nm

2000

39

1200

2

80 Nm 90 Nm

2200

41

1260

2

85 Nm 95 Nm