Bolt Service Operation

Bolt service operation consists of the following phases:

  • Installation check

  • Pressurization phase

  • Nut loosening

  • Nut tightening

Aborting can be done anytime during bolt service operation.

When the system waits for the user to take action, a help text appears after a few seconds and it disappears as soon the expected action is detected.

The definition of delta nut rotation is the sum of the nuts rotation: loosening rotation + tightening rotation. For example, if the loosening rotation is −13 degrees, and the tightening rotation is 15 degrees, the total nut rotation is 2. (−13 +15=2)

Installation Check

The purpose of installation check is to create a reference point for the angle measurement.

  1. Press the pressurize button to prevent the tensioner from rotating during installation check.

    The pressure may undershoot, especially in the first runs after a long break. In that case press the pressurize button again.

    The pressure may overshoot - the system prompts the user to release pressure and try again.

    Overshooting can happen due to the parameter Angle reset force, see section Tensioning Parameters.

  2. Turn the nut clockwise to achieve the torque level set in the parameter Installation check torque(default value 20 Nm). Keep the torque for at least Installation check torque duration (default value 1 second).

    All 3 LEDs turn green.

  3. Release force on the click wrench.

  4. Turn the nut counter clockwise to achieve the torque level set in the parameter Installation check torque(default value 20 Nm). Keep the torque for at least Installation check torque duration (default value 1 second).

    All 3 LEDs turn green.

  5. Release force on the click wrench.

Pressurization Phase

  1. Press and hold the pressurize button.

    Do not try to rotate the nut before the target pressure is reached because the nut is fixed to the flange with high force.

Nut Loosening

  1. Keep the pressurize button pressed to allow the system to keep the pressure above the Min bolt tensioning pressure parameter.

    The pressure will drop slowly, the system will pressurize before it drops below the minimum pressure.

  2. Loosen the nut to Nut loosening min loosening angle.

    If the nut is stuck for some reason, such as corrosion, the system will allow Nut loosening number to attempts, (default value 3), then it prompts the user to tighten the nut again. This will be a NOK result.

    An attempt is defined as the applying torque higher than Nut loosening attempt count torque.

    All 3 LEDs on the angle row are lit when this condition is met.

    If the loosening angle is more than the Nut loosening min loosening angle and the total movement of the nut is within the range between the Min delta nut rotation and Max delta nut rotation, the result is OK.

Nut Tightening

  1. Tighten the nut to Tightening target torque and hold the torque for Tightening torque duration seconds.

    All LEDs are lit when this condition is met.

  2. Release force on the click wrench.

    • If the parameter Automatic pressure release is ON, the system will release pressure when the torque is relaxed to less than 10 Nm.

    • If the parameter Automatic pressure release is OFF, release pressure by pressing de-pressurize button.

When the pressure is released, the OK or NOK result is displayed on the hand controller. In both cases the detailed view shows the recorded pressure/force angle and torque readings.

If the loosening angle is more than Nut loosening min loosening angle and the total movement of the nut is within the range between the Min delta nut rotation and Max delta nut rotation, the result is OK.

Aborting

It is always possible to abort an ongoing task but the system pressure must be released before that.

  1. Press de-pressurize button to release pressure.

  2. Press the Back button to exit the bolt service operation.

    • When aborting bolt service operation during a batch job, the user will get two choice:

      • Cancel Bolt: if the bolt number is incorrect. The hand controller GUI goes back to screen Position tool on bolt.

      • Abort Batch: when the tensioning job needs to be paused or stopped.

When running Bolt Service job, the hand controller GUI goes back to the Tasks menu.