Abstract: To address the application problems existing in the hydraulic systems for offshore platform cranes,an integrated solution is proposed for hydraulic oil heating or cooling,filtering,and quality monitoring during the external circulation. A skid-mounted equipment is developed by integrating various links of the hydraulic oil independent external circulation system for the crane. The electronic control and communication system of the skid-mounted equipment is designed,and the system monitoring software is developed. The various functions of the equipment are verified through experiments.

Key words: hydraulic crane, oil external circulation, skid-mounted equipment, electrical control and communication, monitoring system