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                      Lessons learned from incorrect oxygen welding gas hose

                      by The Editorial Team
                      May 19, 2018
                      in Accidents
                      oxygen welding gas hose
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                      In its latest Safety Flashes, IMCA presents a case of a fire due to incorrectly selected oxygen welding gas hose, during a routine cutting job onboard a ship. There were no injuries or ship damage, but investigation later revealed that the hose had been recently replaced with one that did not comply with ISO 14113 specification.

                      The incident

                      The ship’s welder opened the Oxygen and Acetylene gas bottle valves in order to do a cutting job on deck. These gas bottles were attached to the vessel’s integrated welding gas system. Opening the valve on the Oxygen bottle caused an explosion to a short, high pressure hose delivering oxygen from the bottle to the oxygen gas regulator. The end of the hose caught fire and was quickly extinguished by turning off the oxygen bottle. Nobody was injured and the only damage was to the hose that completely separated.

                      Findings

                      RelatedNews

                      Suez Canal chief hints ‘mistake’ by captain could be linked to Ever Given incident

                      Lessons learned: Collision due to miscommunication

                      • The hose had been recently replaced, but the replacement hose was a hydraulic oil service hose with oxygen fittings. The replacement hose was not compliant with the ISO 14113 specification required by the manufacturer, although the pressure rating was suitable;
                      • The non-compliant hose was supplied from a non-preferred supplier (the required hose length was not available from original supplier);
                      • The onboard team did not adequately check that the hose was of the correct specification.

                      Based on detailed investigation into a similar incident, it was suggested that the cause of the incident was due to adiabatic compression heating within the hose which caused the inner lining to auto-ignite due to residual oil within the hose. Our member notes that there are numerous incidents recorded by industry due to this issue.

                      Lessons Learned

                      Welding hoses should be compliant with ISO 14113. For oxygen hoses, the material should have an auto-ignition temperature suitable for the service (typically > 400⁰), and cleaned for oxygen service.

                      • Do not assume that because a hose is sufficiently pressure rated it is fit for a specific purpose.
                      • Always ensure correct specification hoses are ordered and received.
                      • IMCA notes that in order to avoid adiabatic compression:

                      –> Use only original equipment and spares when handling/servicing oxygen equipment;
                      –> Work clean – no oil or any other hydrocarbon impurities must contaminate the parts (your hands, tools etc.);
                      –> Open oxygen cylinder top valves slowly.

                      Tags: fire onboardIMCAISOlessons learned

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