A Piping Stress Engineer is responsible for analyzing and ensuring the structural integrity of piping systems in various industries, such as oil and gas, power plants, and chemical processing. They use engineering principles and software tools like CAESAR II to evaluate stresses, flexibility, and loads caused by thermal expansion, pressure, vibrations, and external forces. Their role is crucial in preventing failures, ensuring safety, and complying with industry codes and standards like ASME B31.3. They collaborate with piping designers, structural engineers, and project managers to optimize system design and performance.