The scale of wind power installation units and the calculated equipment number are gradually increasing with the development of large-scale wind turbines, resulting in a very large size and weight of the selected temporary anchor equipment. This not only imposes difficulties to the arrangement of temporary anchor equipment on the ship, but also affects the strengthening of the hull structure and the operation ability of the self-elevating installation units. In order to accurately calculate the Equipment Number (EN) of the self-elevating wind turbine installation unit and reasonably configure the temporary anchor equipment, it studies the EN calculation formula and its requirements in the classification rules for the offshore unit from the classification societies. It also compares the calculation results from the rules of several classification societies. Finally, the safety factor of the anchor chain is checked by using the direct calculation method. A more reasonable EN calculation method is proposed to provide references for EN calculation of similar offshore units.

Marine crane can be used in all kinds of ships as it has various types, large lifting capacity, excellent performance and wide application. As one of the indispensable supporting equipment for modern ships, it plays an important role in the shipping industry. The principles, procedures and precautions of the selection and layout of marine cranes have been comprehensively and systematically analyzed. The simplified modelling of the crane is established to clarify the principle and the procedure of the selection and layout of the crane, as well as summarize the review points of the three-dimensional (3D) layout of the crane. The technicians can be instructed to quickly determine the location of the crane based on the layout method described in this paper, and also to quickly check the interference of the crane in 3D environment by using the 3D design software CATIA to verify the rationality of the crane location.