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.

Actions

• 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:

• Incorrect measurement and markings on divers umbilical
• Diver’s worksite identification errors
• Unexpected movement of conductor during diver dredging operations
• Dropped object fell from crane – Poor communication/lack of awareness/control of work [a job had to be left half-finished but this was not properly communicated or handed over – a causal factor was poor communication, particularly at shift handover.]
• First aid injury: Electric shock [the injured person mistakenly accessed the wrong transformer cabinet and got an electric shock. A lesson learnt identified was the importance of clear labelling and the ability of crew to differentiate between similar sets of co-located equipment.]