New methods of oil head refurbishment and repair In order to improve work efficiency, in recent years, advanced ship repair techniques and repair methods have been widely adopted, mainly including:

① Use high-pressure water or high-pressure water sandblasting with a pressure of up to 500 kgf/cm to clean the hull and remove rust, and the rust removal speed can reach 2000 m/h;

②The hull is painted by high-pressure airless spraying method with a pressure of 200 kgf/cm, and if the weather is humid, it is dried with hot air, and the spraying speed reaches 4000 m/h;

③Using the prefabrication method of segmentation and segmentation for ship hull plate replacement, the daily plate replacement volume of a single ship reaches 30-40 tons;

④The divers use tools such as hydraulic or pneumatic brushes to clean or repair the hull underwater to solve the difficulty of repairing large ships without a large dock, and it can be carried out at the same time as loading and unloading cargo to reduce the damage caused by docking. Cause loss of suspension;

⑤Use alkaline solution to remove grease on electromechanical equipment, acid solution to remove scale, neutral solution to clean electrical appliances, the cleaning efficiency is greatly improved;

⑥ For large parts such as crankshafts, shaft systems and rudder stocks, take the method of not dismantling and transporting them to the workshop, and repairing them on the ship or in the dock;

⑦Professional repair of precision parts such as automation devices, governors, superchargers, etc.; ⑧Replacement of small and medium-sized parts in groups, and replacement of old parts according to the new standard before use.