The crane hook and bottom block components are stressed during
each working cycle. Hooks can fail due to cumulative fatigue. The
failures often start as a fatigue crack in the hook shank. Heavy process
duty, changes in application, operation with short lifts and long travel
distances and the use of below-the-hook lifting attachments can all
contribute to premature cumulative fatigue.
The Konecranes Hook Analysis utilizes visual and NDT inspections
combined with fatigue calculations of the hook shank and forged body and
components of the bottom block. The remaining fatigue life of the hook
can be estimated by reviewing the operating history of the crane and using
that in conjunction with the characteristics of the hook itself, the bottom
block and the reeving system. Konecranes uses the most current hook
standard and analysis methods to estimate hook life.
Recommendations are provided for the continued use of the hook along
with a detailed inspection plan.