A configuration of tightening operations designed for circular bolted joints containing thirty-six fasteners. This method ensures even distribution of clamping force across the connected surfaces. An example would be tightening the bolts on a large flange in a circular sequence, typically in multiple passes at incrementally increasing torque values, to achieve a specific pre-load on each bolt.
The application of a defined sequence for tightening fasteners offers substantial advantages in structural integrity and operational lifespan. Consistent tensioning reduces the likelihood of leaks, prevents distortion of joined components, and mitigates the risk of premature failure due to uneven stress. Historically, these methods evolved from empirical observation and have been refined through engineering analysis to optimize joint performance.