Abstract: An enclosed storage tank for the simultaneous addition and removal, and storage, or two liquid layers of different density comprising a tank shell having a bottom, a side wall extending upwardly from the bottom, a roof supported at least in part by the side wall and at least one vertical tubular column extending upwardly from the shell bottom to at least close to the roof; a substantially horizontal first distributor plate above which the column extends and with the plate spaced above but adjacent to the shell bottom; first openings in the column between the first distributor plate and the shell bottom; a high density liquid conduit extending from outside the shell to the column interior whereby high density liquid can be fed to the column interior and then flow out the first openings into the lower portion of the tank beneath the first distributor plate and the high density liquid can be withdrawn from the tank through the first openings and then through the high density liquid conduit; a substantially horiz

Abstract: A "quick-disconnect" rigid mooring system for attaching a ship to a buoyant tower comprises two rigid yoke structures, one of which is attached to the buoyant tower and the other of which is attached to the ship. Each yoke contains one element of a two-element "quick-disconnect" system, which when locked, achieves a rigid interconnection between the vessel and the buoyant tower. The yoke structures are provided with means which permit the structures to be properly aigned during the connect and disconnect procedures. The locking element of one of the yokes comprises an arm which projects from the end thereof, and a pair of transversely extending pins situated below the outwardly projecting arm. The locking element of the other yoke comprises a pair of spaced, parallel outwardly projecting arms provided with longitudinal slots that accept the outwardly projecting pins on the other yoke and guide the two yokes into aligned proximity, permitting the lock to be effected.