How often should the installation wrench be calibrated by testing in a tension calibrator when using calibrated pretensioning?

The installation wrench should be calibrated daily when using calibrated pretensioning. This frequent calibration is essential to ensure consistent accuracy and reliability in achieving the required tension in bolted connections. Since bolted connections play a critical role in the structural integrity of steel structures, maintaining the precision of the installation wrench directly influences the effectiveness of pretensioning.

Calibration allows for the identification and correction of any discrepancies that might arise from wear and tear, environmental factors, or other influences that can affect the wrench's performance. Daily checks help in maintaining the necessary standards defined by various codes and guidelines for structural steel work, ensuring both safety and structural performance.

Less frequent calibration, such as monthly or quarterly, may not adequately address potential variations in wrench performance, potentially leading to improper tensioning and compromising the stability of connections. Therefore, daily calibration is critical in high-stakes applications where precision is paramount.