With the vigorous development of China's offshore oil and gas and offshore wind power resources, the long-term safety and reliability of submarine cables is particularly critical. In the face of various complex marine environments faced by submarine cables. Compared with rigid risers, flexible risers have better compliance, can be used in worse environments and have a wide range of applications.

Product characteristics of polyurethane submarine cable bending limiter: bending resistance, folding resistance, water resistance, oil resistance, cold resistance, ultraviolet resistance, wear resistance and flame retardant, with bending life of more than 8 million times.

Polyurethane submarine cable bending limiter has the characteristics of high flexibility and is widely used as control connecting line. In the control unit with bending requirements, it is specially designed to meet the requirements of the situation where the cable can move flexibly without tension and forced movement in the drag chain system with continuous bending and free movement. The buoyancy module installed outside the marine riser column comprises a semi-annular female end, a semi-annular male end, a snap ring, a snap groove, an auxiliary pipeline channel and a riser column channel. The semi-annular female end is connected with the semi-annular male end through the snap ring and the snap groove. The snap groove is arranged on the left and right sides of the semi-annular female end and is an integrated structure with the semi-annular female end, The snap ring is installed on the half ring male end, the snap ring is matched with the snap groove, and the snap ring corresponds to the position of the snap groove. The utility model relates to a buoyancy module installed outside the marine riser column. The design of the buoyancy module can reduce the underwater weight of the marine riser column, and has the advantages of simple structure, convenient installation, high pressure resistance grade and large applicable water depth range.