ENTER 95403 Tel: 01295 270333
ipesearch.com/enquiry
ENTER 95404 Tel: 0121 601 6350
ipesearch.com/enquiry
ENTER 95405 Tel: 0191 491 0808
ipesearch.com/enquiry
loosening it. Its initial length was
recorded using a USM-3 meter and a
magnetic transducer placed on the
bolt end. The elongation measurement
did not seem to be stable since the
value was constantly drifting.

Norbar’s ultrasonic specialist,
Gregory Young, says: “The tower base
foundation bolt was located at a 160°
angle from the wind direction. As the
wind increased, it pushed the tower
in the direction of the bolt, the joint
was compressed slightly and the
elongation decreased. As the wind
decreased the tower rebounded and
the bolt’s elongation increased as the
compressive forces on the joint
decreased. The ability to read in real
time minute fluctuations in the bolt
tension can be of value to those
dealing with bolted joint issues.”