Initial tension of the mooring rope is the mast without a working mooring rope taut in advance. Initial tension of work force include 15%-20%, or by operating rules to take a number, usually 3~5T. 2. the tension of the mooring rope tension refers to the mast crane at work, load borne by mooring rope. In assigning the correct mooring rope techniques, there is a mooring rope in lifting vertical axis and mast of the decision in the vertical plane, the mooring rope called "rope for main cable." 3. mooring rope selection basic principle: all the mooring rope rope for main cable select. Mooring rope when choosing rope for main cable tension and the initial tension is based on.