Huaiyu group is also engaged in the maintenance of new units in addition to the installation. It has successively participated in the maintenance work of more than ten domestic refineries and overseas refineries of CNPC, and completed the maintenance tasks with high standards, which has been unanimously praised by the owner. At the same time, it has also cooperated with Bluestar Cleaning, the leader of cleaning industry in China, to carry out the high-pressure water and chemical cleaning business of device maintenance, device maintenance and cleaning process operation, seamless docking, using the international advanced automatic cleaning equipment, greatly reducing the coordination workload of Party A in device maintenance, improving work efficiency and maintenance quality.