What is the correct procedure for setting a torque wrench?

• A. 50%, 100%, 25%, 75%
• B. 25%, 50%, 75%, 100%
• C. 100%, 75%, 50%, 25%
• D. 75%, 50%, 100%, 25%

Answer: (B)

The correct procedure for setting a torque wrench involves a systematic approach to ensure that it is calibrated accurately for achieving the desired torque specifications. By starting at a lower percentage of the target torque—specifically 25%—and progressively working up to the full value while moving in increments (to 50%, then 75%, and finally to 100%), the torque wrench is able to handle the adjustments without overshooting or causing damage to the fasteners or joints.

This method helps prevent sudden jolts that can lead to inaccurate torque settings, ensuring a more precise application of force. Additionally, this gradual approach allows for more control and consistent output, resulting in a more reliable installation that meets specified tolerances. Overall, this method is critical in pipefitting and other mechanical applications to maintain integrity and safety within the system being assembled or repaired.