① Port construction and maintenance When a new port is built, the harbor and waterway need to be dredged to reach the designed water depth. Large-diameter dredging pipes can efficiently transport the excavated silt. For example, in the construction of large container ports, it is necessary to dig a deep enough channel for large ships to enter and exit safely. The dredging ship sucks out the silt and other debris on the seabed through a large-diameter dredging pipe and transports it to the designated filling area, creating good basic conditions for the construction of port terminals. During the use of the port, due to the siltation, regular maintenance and dredging are required. Large-diameter dredging pipes can quickly clean up the silt deposited at the bottom of the channel and harbor to ensure the normal operation of the port. In estuary ports such as the Yangtze River Estuary, due to factors such as river silt input and ocean power, silt deposition is more serious. Large-diameter dredging pipes play a key role in keeping the waterway unobstructed. Wide and deepen the waterway With the development of the shipping industry, the trend of large-scale ships is obvious. In order to meet the navigation needs of large ships, it is necessary to widen and deepen the existing waterways. Large-diameter dredging pipes can transport a large amount of dredged materials and play an important role in waterway dredging projects. For example, in the widening project of the Panama Canal, large-diameter dredging pipes were used to transport rocks, soil and other materials excavated from the bottom of the canal, ensuring that the canal can accommodate larger tonnage ships and improving the efficiency of global shipping.