widos 8000 WM SPA, Working Instructions Translation

Page: 66 / 114

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09.06.15 Working Instructions WIDOS 8000 WM SPA page 66 of 108
7. Welding log and tables
The values in the following welding tables are meant for pipes that are welded to each other on the face side.
When you weld a T-piece you must add the values with the factors (chapter: 6.5 and 6.6).
7.1. Formulas for the welding of pipes with different diameters
The aligning pressure = welding pressure can be calculated for all pipes with special measures by the
following formula.
Pipes out of PE:
(DA
2
- DI
2
) * 3,141592654 / 4 * 0,15 / 232+1
(for welding without additional cylinder)
(DA
2
- DI
2
) * 3,141592654 / 4 * 0,15 / 348+1
(for welding with additional cylinder)
Pipes out of PP:
(DA
2
- DI
2
) * 3,141592654 / 4 * 0,10 / 232+1 (
for welding without additional cylinder)
(DA
2
- DI
2
) * 3,141592654 / 4 * 0,10 / 348+1
(for welding with additional cylinder)