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Incorrect as-built drawing configuration

What happened

During leak investigations at a subsea manifold, divers carried out intervention on the system in accordance with approved procedures based on information provided by the client.

It subsequently became apparent during fault-finding that the subsea asset’s actual jumper configuration differed from the data received from the client.

What went wrong

Divers carried out intervention on a system which actually only had a single unproven barrier in place.

What was the cause?

Incorrect information was provided by the client.


  • Work was stopped until it could be ascertained that the system was safe for further intervention;
  • The client was alerted and conducted a thorough internal investigation. They could not pinpoint how the error occurred. The drawings were redone with the amendments in place and formally approved.

Members may wish to refer to:

Safety Event

Published: 28 January 2022
Download: IMCA SF 03/22

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