According to DIN 1986, part 1, section 6.1.2, the changes of the direction of main pipelines and sewers may be fulfilled only with using prefabricated pipe bend, and each individual bend can have a maximum angle of 45˚. In some cases, for these purposes can be used two pipe bends 45˚. Due to the double knee one connecting element is saved and the installation becomes easier. In addition, this fitting provides a good opportunity to place the fastening element in its middle. The bend is also intended for use as a transition from the riser to a horizontal pipe, and vice versa.
| Nominal internal diameter | X1 | X2 | X3 | Weight | Code number |
|---|---|---|---|---|---|
| DN | mm | mm | mm | kg | |
| 50 | 50 | 100 | 121 | 1,0 | 155754 |
| 70* | 60 | 120 | 145 | 1,4 | 155783 |
| 80 | 60 | 120 | 145 | 1,5 | 176707 |
| 100 | 70 | 140 | 170 | 3,1 | 155819 |
| 125 | 80 | 160 | 195 | 4,2 | 155872 |
| 150 | 90 | 180 | 219 | 7,0 | 155905 |
*Diameter 80 gradually replace diameter 70
