Qualified welders follow approved procedures. Thermocouples monitor preheat and PWHT. All data logged automatically.
Document as-found condition. Photograph the rotor. Measure vibration history if available. Api 687 Rotor Repair Pdf Download--------
Perform in accordance with ISO 21940-11. Residual unbalance typically U per plane ≤ 4 W/N (W=weight in kg, N=service speed in RPM). Qualified welders follow approved procedures