A shiplift includes a pier defining a space. The pier includes lifting apparatus. The shiplift includes a shiplift platform configured to fit within the space defined by the pier. One or more movable connectors are mechanically coupled to the shiplift platform. Each movable connector is configured to move into at least two positions, including a first position and a second position. In the first position, the movable connectors are mechanically coupled to the shiplift platform and positioned to allow the shiplift platform to enter the space defined by the pier. In the second position, the movable connectors are mechanically coupled to the shiplift platform and positioned to mechanically couple to the lifting apparatus of the pier.

A shiplift includes a pier defining a space. The pier includes lifting apparatus. The shiplift includes a shiplift platform configured to fit within the space defined by the pier. One or more movable connectors are mechanically coupled to the shiplift platform. Each movable connector is configured to move into at least two positions, including a first position and a second position. In the first position, the movable connectors are mechanically coupled to the shiplift platform and positioned to allow the shiplift platform to enter the space defined by the pier. In the second position, the movable connectors are mechanically coupled to the shiplift platform and positioned to mechanically couple to the lifting apparatus of the pier.

The present disclosure relates to methods and apparatus for launch and recovery of a remote inspection device within a liquid storage tank. In one embodiment, the tank is accessed by opening an entrance hatch and then injecting a vapor suppression foam across a surface of a stored liquid mass to form a foam layer. A launching system having a remote inspection device is attached to the entrance hatch to define a launch and recovery space sealed from an external environment and isolated from the stored liquid mass in the tank via a valve and the foam layer. The launch and recovery space is purged of hazardous vapors by injection of an inert gas prior to launch and recovery of the remote inspection device. Prior to removal of the launching system, the surface of the stored liquid mass is re-coated with vapor suppression foam.

A catamaran lifting apparatus is disclosed for lifting objects in a marine environment. The apparatus includes first and second vessels that are spaced apart during use. A first frame spans between the vessels. A second frame spans between the vessels. The frames are spaced apart and connected to the vessels in a configuration that spaces the vessels apart. The first frame connects to the first vessel with a universal joint and to the second vessel with a hinged connection. The second frame connects to the second vessel with a universal joint and to the first vessel with a hinged or pinned connection. Each of the frames extends upwardly in an inverted u-shape, providing a space under the frame and in between the barges that enables a marine vessel to be positioned in between the barges and under the frames.

A catamaran lifting apparatus is disclosed for lifting objects in a marine environment. The apparatus includes first and second vessels that are spaced apart during use. A first frame spans between the vessels. A second frame spans between the vessels. The frames are spaced apart and connected to the vessels in a configuration that spaces the vessels apart. The first frame connects to the first vessel with a universal joint and to the second vessel with a hinged connection. The second frame connects to the second vessel with a universal joint and to the first vessel with a hinged or pinned connection. Each of the frames extends upwardly in an inverted u-shape, providing a space under the frame and in between the barges that enables a marine vessel to be positioned in between the barges and under the frames.

A hydraulic ship lift, including: a mechanical synchronizing system; a stabilizing and equalizing hydraulic driving system; and a self-feedback stabilizing system. The stabilizing and equalizing hydraulic driving system includes first resistance equalizing members arranged at corners of branch water pipes or/and second resistance equalizing members arranged at bifurcated pipes, circular forced ventilating mechanisms arranged at front of water delivery valves of a water delivery main pipe, and pressure-stabilizing and vibration-reducing boxes arranged behind the water delivery valves. The self-feedback stabilizing system includes a plurality of guide wheels; each guide wheel of the self-feedback stabilizing system is fixed on a ship reception chamber through a supporting mechanism. The supporting mechanism includes a base connected to the ship reception chamber, a support articulated on the base, a flexible member fixedly arranged between the support and the base, and a limiting stopper arranged on the outer side of the flexible member.

A watercraft bunk assembly includes a lower base that is secured to a support post of a boat lift or other boat supporting structure. A separate upper base is slidably interengaged with the lower base. The upper base is configured to carry a cushion component at an angular inclination for engaging and supporting a boat or other watercraft. Various upper bases having different respective configurations may be interchangeably engaged with the lower base, which enables the bunk assembly to be used for supporting a number of different types of boats and hull configurations.

A watercraft bunk assembly includes a lower base that is secured to a support post of a boat lift or other boat supporting structure. A separate upper base is slidably interengaged with the lower base. The upper base is configured to carry a cushion component at an angular inclination for engaging and supporting a boat or other watercraft. Various upper bases having different respective configurations may be interchangeably engaged with the lower base, which enables the bunk assembly to be used for supporting a number of different types of boats and hull configurations.

A watercraft lift with rearward and forward lateral beams, left and right side longitudinal side beams, a pair of left side lifting arms, a pair of right side lifting arms supporting at their upper ends left and right side watercraft supports, and left and right side actuators pivotally attached to the left and right side rearward lifting arms. In one embodiment the left side rearward lifting arm and the left side actuator rotate about their pivotal attachments to the longitundinal left side beam in a left side plane, and the right side rearward lifting arm and the right side actuator rotate about their pivotal attachments to the longitundinal right side beam in a right side plane.

A watercraft lift with rearward and forward lateral beams, left and right side longitudinal side beams, a pair of left side lifting arms, a pair of right side lifting arms supporting at their upper ends left and right side watercraft supports, and left and right side actuators pivotally attached to the left and right side rearward lifting arms. In one embodiment the left side rearward lifting arm and the left side actuator rotate about their pivotal attachments to the longitundinal left side beam in a left side plane, and the right side rearward lifting arm and the right side actuator rotate about their pivotal attachments to the longitundinal right side beam in a right side plane.