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.

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 group of devices that are permanently installed on a watercraft lift device that are used to create a temporary, yet secure, connection between the bunk system of a watercraft lift and the lift support pilings to prevent the bunk system and watercraft from moving excessively during wind events. The devices allow the bunk system to be quickly secured and released to watercraft lift support pilings as required to prevent motion during watercraft storage periods and allow for normal operation of the watercraft lift when desired. The group of devices also serve as an attachment point for watercraft tie down straps as are sometimes installed during wind events. The devices are meant to stay attached to the watercraft lift in a permanent manner such they are readily accessible at any time the operator wishes to create a temporary connection between the bunk system and the lift support pilings.

A group of devices that are permanently installed on a watercraft lift device that are used to create a temporary, yet secure, connection between the bunk system of a watercraft lift and the lift support pilings to prevent the bunk system and watercraft from moving excessively during wind events. The devices allow the bunk system to be quickly secured and released to watercraft lift support pilings as required to prevent motion during watercraft storage periods and allow for normal operation of the watercraft lift when desired. The group of devices also serve as an attachment point for watercraft tie down straps as are sometimes installed during wind events. The devices are meant to stay attached to the watercraft lift in a permanent manner such they are readily accessible at any time the operator wishes to create a temporary connection between the bunk system and the lift support pilings.

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 boat lift drive for connection to a winch having a winch shaft. The boat lift drive includes a power unit, a drive train engaged to and being driven by the power unit, and a drive shaft engaged to and being driven by the drive train. The drive shaft in turn is engaged to and drives the winch shaft. The drive train includes a seat with a frustoconical section and the drive shaft includes a head with a frustoconical section. The frustoconical sections are press fit into each other. This frustoconical engagement provides a great amount of torque for lifting boats.

A boat lift has a transverse flotation tank that joins a first flotation tank construct and a second flotation tank construct. The transverse flotation tank has one or more pumps that evacuate water from the first flotation tank construct, the second flotation tank construct and the transverse flotation tank and create flotation of the boat lift. Modular boat lifts may be constructed according to the invention that have substantial size but are transportable by truck for construction on site.

A lift assembly comprises a frame work extending between a first lift side and a second lift side and a frame support system wherein a portion of the frame support system includes a ski system that extends under the frame work in the direction of travel such that a continuous sliding surface is presented to slide the frame over obstacles.

A lift assembly comprises a frame work extending between a first lift side and a second lift side and a frame support system wherein a portion of the frame support system includes a ski system that extends under the frame work in the direction of travel such that a continuous sliding surface is presented to slide the frame over obstacles.