d1
It is extremely important to re-round the pipe prior to the welding process.
In order to do so, measure the pipe diameter with a tape measure, find the maximum and minimum diameter points and calculate the difference between these diameters. Pipe ovality (out of round) = d1-d2
d2
d1= max OD of pipe d2= min OD of pipe
Do not perform an ElectroFusion weld if the pipe does not meet the criteria defined below at the section where the EF fitting is to be welded. Use a pipe re-rounder if necessary to correct pipe ovality.
For pipe DN < 315 d1 – d2 < 1.5% DN or <3 mm (whichever is the smallest value.)
For pipe DN ≥ 315 d1 – d2 < 1% DN or < 5 mm (whichever is the smallest value.)
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