Steam Turbine Inlet Flange

Problem: The main problem with this application was time for installation and removal. Each installation required about 24 man-hours utilizing heating rods and a 1-1/2" impact. Removal required about 24-40 man-hours.

Two workers at 180º apart tighten the flange in a star pattern. Impacts are used to tighten close to the target torque.

Superbolt Solution: The application shown utilized (12) 2-3/4" Torquenuts® with Flexnuts®. Installation of the studs, tensioners, and Flexnuts required only 3 man-hours. Only two workers were required for the job. Total tightening time after the Flexnuts and tensioners were seated was about 35 minutes. Eight jackbolts were tightened to 156 ft-lbs for a prestress of 45,000 psi.

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  Tightening completed in35 minutes!