A pier mounted shipside oil barrier seal structure floating on the water surface for use between a generally fixed connection point floating on the water surface and a ship having a side surface. The structure comprises a floating shipside oil seal member vertically extended above and below the water level, having at its ship-contacting end a flexible elastic rubber-like vertically extended sealing element for contacting the ship side surface. It is mounted on the pier by a pair of transversely spaced supports slideably supporting it for transverse movement, the supports being arranged for free vertical movement of the floating oil seal member with the water level as it changes with respect to the pier and the ship side. Springs are connected between the oil seal member and the supports for urging the oil seal element into contact with the ship's side. It may also have a bendably collapsible portion collapsible upon horizontal movement of the ship side toward the fixed connection point.
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