In order to facilitate regular wear and tear testing of the FPSO's mooring system,reduce testing costs,and ensure operational safety,a portable underwater detection device integrated cabin was set forth.Combined with the working environment of the cabin,in order to protect the safety of operators and equipment,the combustible gas leakage simulation was carried out in the cabin,the diffusion law of combustible gas was studied,the consequences of combustible gas leakage in the work cabin were analyzed,and the maximum risk situation of combustible gas leakage into the work cabin was determine.In light of the simulation results the diffusion law of combustible gas under different conditions was summarized,which can provide reference for risk as-sessment and oil and gas leakage prevention and control design in the research process of the work cabin.
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