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High CO2 in Diver Breathing Gas.
Country: UK - Europe
Location: OFFSHORE : Specialist vessel eg diving, construction, survey
Incident Date: 23 October 2016 Time: ---
Type of Activity: Diving, subsea, ROV
Type of Injury: Other
Divers experienced breathing difficulties, symptoms of agitation, restricted breathing and headaches indicated high levels of CO2.
What Went Wrong?:
Produced CO2 was not removed by diver reclaim soda sorb towers. Divers gas reclaim towers had been allowed to saturate permitting the CO2 levels to build up in the closed circuit reclaim
loop as the scrubbing agent (soda sorb) had not been replaced at an appropriate point. Replacement of soda sorb in the divers gas reclaim is based upon monitoring of reactive alarms, this is currently accepted Industry Practice. The first and last point Reclaim
Analyser alarms did not sound at the expected threshold as they had been incorrectly set up and calibrated. The divers did not initially notify the diving Supervisor of breathing difficulties when they were first apparent, the symptoms experienced at the time
were not prevalent enough to raise alarm. Ineffective management of Dive manuals to ensure they align with manufacturers guidelines and provide sufficient detail regarding management of analysers.
Corrective Actions and Recommendations:
Competency: Highlight safety critical roles within Contractors Assurance/Competency schemes and assess status of completion against safety critical roles.
Safety Alert number: 280
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