The expansion joint with code P51913-01 is a critical component in the MAN L21/31 engine’s piping and exhaust systems, designed to compensate for thermal expansion and mechanical movement during operation. By absorbing axial, lateral, and angular displacements, the expansion joint protects rigid pipes and connected equipment from excessive stress, fatigue, and cracking caused by temperature fluctuations and vibration. Its robust, flexible construction ensures long-term reliability, reduces structural loads, and supports safe and efficient engine operation in demanding marine and power generation environments.