Dual passage pipe for cycling water to an undersea mineral aggregate gathering apparatus

摘要

A dual passage string of pipe for use in cycling fluid from a ship to an undersea mineral aggregate gathering apparatus. The string of pipe is made up of sections of concentric inner and outer pipes. The outer pipes are screwed together and the inner pipes slide telescopingly within each other. The inner pipes are suspended in the outer pipes at their upper ends by a rigid supporting ring supported by an internal shoulder in the outer pipe. The internal shoulder is located at the base of the threads and is separated from the lower end of the male threaded section. A resilient seal ring is carried between the supporting ring and the male threaded section for preventing water from entering the threads to avoid corrosion.