The different sections of the stinger construction are joined by steel shafts in bronze bushings,
locked by keeper plates bolted to the shaft and the construction.
Although this should be a static application it appeared that the shafts tended to rotate.
Bolts on several keeper plates had sheared off and one shaft had worked itself sideways by almost 50mm.
Static friction between shafts and bronze bushings appeared to be so high that the forces and torques caused
by the micro motions were far higher than anticipated. When this was discovered the concerned bronze
bushings were replaced by D-Glide FS bushings (D-glide FS is a high load, high stiffness variety of the D-glide F).
Average bearing pressures in this application can go up to as much as 180 MPA.
Advantages of the D-Glide solution
- Low torques because of low friction
- No corrosion
- Easy installation