PWHT Tripped !

[Parth Mandalaywala]

I had 8 joint in PWHT process. 3 joints were Soaking stage while rest were in heating stage. Suddenly, the machine tripped. The technician was dumb & almost half hour passed by. My Concern is, do I start the whole process again or what? Pls, give answer with reference to code. I searched Sec 8, but found nothing. Any logical & practical solution will be appreciated.