Always take preventive measures during diving operations

IMCA has reported an incident in which a diver received a hand injury during diving operations. The event occurred during joint rectification activities on a riser flange at 169 msw, following a report of a leak during commissioning.

The divers were de-tensioning the flanges, and once the flanges were separated, the ring joint became free and fell off the middle of the flange to the seabed. A diver went to recover the ring joint from mud unaware that it was damaged.

The damaged part of the ring joint punctured the divers’ soft neoprene glove and caused two small penetration wounds to his right hand, between the thumb and index finger. The injured diver returned to the diving bell and received first aid (the wounds were washed with fresh water and cleaned).

The bell run was terminated.Once the bell was locked on, the injured diver returned to the Sat chamber and received further treatment by the Diver Medic Technician (advised by on-board doctor and company Hyperbaric Doctor) including:

• Further thorough cleaning of the wounds with antiseptic solution, an application of antibacterial cream and the dressing of the wound;
• Tetanus vaccination and oral antibiotics as preventive measures.

Findings

• The ring joint had been installed on a previous diving project by another diving subcontractor;
• The ring joint came free and fell down into the mud as soon as the flanges were separated;
• There was no chance for the diver to ascertain the ring joint conditions;
• This occurrence was unlikely – it was the first occurrence in over twenty years of a similarly damaged ring joint;
• The direct causes of the incident were found to be:

1. improper installation of the ring joint during a previous diving campaign with consequent deformation and damage of the latter
2. ring joint falling to the seabed
3. mud on the seabed;

Other causal factors identified were:

• great difficulty in ascertaining the condition of the ring joint before recovery from the mud
• the diver’s gloves (fit for diving purpose) were not designed to protect against cut and perforation.

Source: IMCA