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SAFETY4SEA

Lessons learned: Ineffective crane stinger hook pin installation

by The Editorial Team
March 9, 2023
in Accidents
lessons learned

Credit: Shutterstock

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A recent IMCA Safety Flash focuses on a Safety Report 452, published by the United States Bureau of Safety and Environmental Enforcement (BSEE) relating to a high-potential dropped object incident on a Gulf of Mexico energy facility, to provide lessons learned.

While using the platform crane to suspend a wireline lubricator, the pin holding the hook on the crane stinger backed out, resulting in the hook and lubricator falling. The incident caused damage to a section of the lubricator.

What went wrong

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The incident investigation found that the cotter pin at the end of the hook pin had sheared (See Figure 1), which allowed the washer to fall and the pin to back out. When the pin backed out, it caused the ear on the connection to distort (See Figure 2), resulting in the hook failing. The investigation also found there was an inadequate pin configuration design. The pin installed on the hook assembly had a smooth composition (See Figure 3). The operator determined that a threaded bolt with nuts and keepers (See Figure 4) was the proper pin design for ensuring the stinger remains secure throughout lifting operations. BSEE notes that following this event, the operator inspected their other facilities and found the same improper arrangement on additional cranes.

lessons learned
Credit Image: IMCA
lessons learned
Credit Image: IMCA
lessons learned
Credit Image: IMCA
lessons learned
Credit Image: IMCA

Actions

Therefore, BSEE recommends that operators and contractors:

  • Inspect all cranes on the facility and verify that the hook assembly has a threaded pin with nuts and keepers.
  • Retro-fit any stingers equipped with an improper stinger hook pin configuration.
  • Verify all crane components are in alignment with current manufacturer recommendations.
  • Add “assessment of the pin condition” into the pre-use inspection checklist, which should be completed before conducting lifting operations.
Lessons learned: Ineffective crane stinger hook pin installationLessons learned: Ineffective crane stinger hook pin installation
Lessons learned: Ineffective crane stinger hook pin installationLessons learned: Ineffective crane stinger hook pin installation
Tags: BSEEGulf of MexicoIMCAlessons learned
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