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SAFETY4SEA

Lessons learned: Sudden and uncontrollable move of A&R head

by The Editorial Team
March 16, 2023
in Accidents
lessons learned

Credit Image: Shutterstock

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A recent IMCA Safety Flash focuses on an incident in which a vessel was preparing for pipeline abandonment, at the end of offshore pipeline installation operations, to provide lessons learned.

The pipe end clamp was in the Hand-off Module (HOM) and had been bevelled and prepared and the team were in the process of installing and aligning the Abandonment & Recovery (A&R) head for welding. Prior to installing the A&R head, the required volume of water had been removed from the flooded pipe clamped in the HOM.

The A&R head was then lifted into position using the workstation crane. With the A&R head lifted into position, an external pipe clamp was used to help with line-up and to secure the head in the required welding position. As the final adjustments were being made, the A&R head assembly was moved upwards and then ejected in an uncontrolled manner from the pipe end. It swung uncontrollably for a short period but did not drop as it was still supported by the workstation crane. This was brought under control quickly by one of the deck team.

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Crew members were nearby but no-one was injured.

lessons learned
Credit Image: IMCA Showing A&R head ejected due to pressure

What went wrong

  • There were no vent holes in the A&R head, as was specified by the client.
  • The ‘suck and blow’ effect from the residual water in the pipe had not been recognised as a risk, as this incident/event had never occurred at this magnitude before.
  • There were more people present (and hence at risk) than strictly necessary.

Lessons learned

  • A renewed focus on controls, barriers, and risk management where Line of Fire risks have been identified.
  • Can the task be done safely with fewer people present?
  • Challenge norms and specifications and assess if they introduce changes with additional risks.
  • Consider and plan for “suck and blow” effects for similar operations.
Lessons learned: Sudden and uncontrollable move of A&R headLessons learned: Sudden and uncontrollable move of A&R head
Lessons learned: Sudden and uncontrollable move of A&R headLessons learned: Sudden and uncontrollable move of A&R head
Tags: IMCAlessons learned
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