SednAir had completed a manufacture and improvement project of 40,000 Nm3/H centrifugal compressor for The Linde Group last week. As the largest industrial company in Germany and the biggest air separation company around world, Linde Group expects products to be the highest level of quality and performance. SednAir had competited with the biggest compressor company and won the bid as owned professional ability on aerodynamic design and precision manufacturing, also on the basis of SednAir excellent behavior in the industrial with more than 10 years. In the almost one year, America SednAir and SednAir China conducted a great teamwork toward this project with 'Rotor dynamics design', 'Thermodynamics" and manufacturing. SednAir China engineering and quality Department performed a great success on the mapping and computation for the bull gear casing which guaranteed the follow stages of the project. The unit had been successful started up in the first time at the jobsite by SednAir Service engineers. The unit had been tested for aerodynamic performance and mechanical performance at the so site and all showed in excellent results. The complete project has been accepted by The Linde Group and the unit has been operated in the plant network.