Project Manager
Wind Energy
Wanzek Construction, Inc.

There are many benefits to electric torque equipment including time, durability, calibration/testing capabilities, simple operation, torque & angle settings, and many more things. I will hit on a few of the advantages below.

First and probably the most important would be time savings verses using a Hydraulic pump. To torque the flanges with an E-RAD it takes a fraction of the time. Almost in half, this allows the tower climbers to fly the next section in and have the flange completed before the ground guys are ready to bring up the next section. This saves on wait time for the ground crew along with allowing the tower climbers to get to the next section and get prepped before the next section arrives. The time is also based off of the durability of the E-RAD, there is minimal if any down time with an E-RAD and hydraulic torque equipment tends to overheat leaving time where there is no torque operations being completed.

Second the calibration and testing capabilities of the E-RAD system by far exceed the capabilities of the hydraulic torque tools. The E-RAD system allows us to track digitally all of the torque testing. When testing the E-RAD the data is transferred onto a program that logs the data and can be manipulated to fit the format we need for the tower manufacturer specifications. We can create reports that are clean and neat and can be saved on the computer. The documentation can then be sent via e-mail, or printed off and kept in a file. The E-RAD is also capable of tracking the torque operations performed on that tool. We can take this information and monitor the torque operations in the tower and track if we are seeing issues with the final torque. With hydraulic tooling the testing and documentation is done by hand and can lead to errors.

The simple operation of the E-RAD helps eliminate mistakes when setting the torque value. The E-RAD has a digital display that allows you to adjust the torque value along with adjust the units to ft.lbs, NM, etc. This takes out any calculation mistakes. With hydraulic pumps there is a not a set amount and is up to interpretation of the person setting the torque amount. The E-RAD also allows us to set up to 6-8 different torque setting and lock them into place. This secures the torque amount and does not allow anyone else to adjust the amount unless they have the key.

The E-RAD is a simple tool to use. There is no changing of oil like you would have with a hydraulic pump, and the only maintenance that would occur is from the normal wear and tear. To operate an E-RAD it is as simple as hooking the torque gun to the box, plugging the box in, turning the box on, setting the torque value, and starting the torque process.

A feature that is also a huge benefit to the E-RAD equipment is the torque and angle feature that allow the gun to torque to a certain value then turn the nut a set amount of degrees. For example you would set your E-RAD to 350Nm + 120°. Once you start the torque process the gun will automatically torque the bolt to 350Nm stall for a short moment and then move the nut 120°. This is vital to some of the torque procedures we are asked to do. This process allows us to torque in a continuous motion and not have to stop and rely on someone’s eyes to get to the 120°.

Lead Project Engineer
Wind Energy
Wanzek Construction, Inc.

The margin for error is a lot less because the tools can be locked on a specific torque value. On a Hytorc you have to try and get as close to the pressure as you can, it’s not exact. Also there is a data log which lets you know how many bolts were torqued.  Also if there were any failed torques, or over torques.   If I were to guess I would say it takes 33% of the time out of torquing.

On the E-RAD 2000’s they have the torque and angle function. Basically that makes it easy on GE rotors so when you stab blades you can do the 2 flats with the E-RAD, you can set the gun to 120 degrees and go to town.