In the demanding marine environment, hydraulic cylinders are subjected to extreme conditions such as corrosive saltwater, high-pressure loads, dynamic wave forces, and temperature fluctuations. Ensuring the structural integrity of these critical components through rigorous strength calculations is paramount. Proper design validation prevents catastrophic failures that could endanger crew safety, disrupt operations, or cause environmental harm from oil leaks. Strength calculations verify that cylinders withstand operational stresses, including hoop stress in the barrel, buckling resistance in the piston rod, and fatigue from cyclic loads. Compliance with international standards (e.g., ISO, DNVGL) and corrosion-resistant material selection further enhance reliability and longevity. By prioritizing precise strength analysis, marine engineers mitigate risks, extend equipment lifespan, and uphold compliance with stringent maritime regulations—safeguarding both human lives and ocean ecosystems.