Hydrogen Gas Accumulation in Subsea Umbilical Cable Splitter Boxes: Evaluating HSE Risk, Overcoming Challenges & Deploying Mitigation Measures

Abstract This paper presents a comprehensive analysis of potential sources of hydrogen (H2) gas, its propagation, and accumulation within subsea umbilical cable splitter boxes, leading to deformation of the splitter box. With a focus on addressing challenges and proposing effective mitigation strategies, this paper provides actionable insights for practicing engineers. The meticulous exploration of health, safety, and environmental (HSE) risks enhances the understanding of subsea cables & umbilical, making this paper a valuable resource for managing risks and safety protocols in the upstream oil and gas industry. An integrated approach has been developed through discussions with key stakeholders, including the original equipment manufacturers (OEMs) of the umbilical cable, topside umbilical termination unit (TUTU) & splitter box teams, and consultants. This collaborative effort led to root cause analyses and the identification of the most efficient and cost-effective methods for mitigating hydrogen accumulation in splitter boxes. The insights gained from this study can be applied to similar installations, helping to enhance the safety and reliability of subsea electrical systems in the oil and gas industry. Future work will focus on monitoring the effectiveness of the implemented measures and exploring additional strategies for further risk reduction.