Evaluation of Operational Tightening (TBSS Method)
Bolted flanges connections - TBSS Method (Tight Between Seal and Strength)

Determining an appropriate tightening force relies on identifying an acceptable range, bounded by two fundamental values:

• the lower limit $F_{\mathrm{ME}}$ , corresponding to the minimum threshold guaranteeing the joint’s long-term seal;

• the upper limit $F_{\mathrm{MM}}$ , representing the maximum permissible limit before mechanical failure of the assembly components (flanges, bolts, gasket).

Between these two extremes lies the useful operating range, within which a target torque...