During the capacity expansion renovation of the 6MD32-215/146 carbon dioxide compressor, the cylinder diameter of the fifth stage was expanded from Φ170mm to Φ180mm. After the cylinder expansion, the piston rods of the fifth stage of the compressor frequently broke, and the current of the compressor motor was too high.

A synchronous motor is an alternating current motor, while an asynchronous motor is also known as an induction motor.

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To assist industry professionals and technical personnel in enhancing their theoretical knowledge and technical skills, accurately grasping the development trends of the industry, and at the same time promoting the implementation and transformation of research and development achievements by academic institutions and scholars, as well as expanding the promotion channels for teaching outcomes, the editorial department of "Compressor Technology" actively plays the role of a bridge and liaison, coordinating and organizing industry enterprises and academic institution editorial boards to carry out in-depth cooperation and exchange activities between industry, academia and research. 

The spare parts referred to in this article are the same as those commonly known as spare parts and materials. In Germany, they are managed together. The goal of the economic management of spare parts is to ensure equipment maintenance while also adhering to the cost target. The key points include the consumption volume, reserve quantity, quality and storage cost of the spare parts.