Abstract: A liquefaction system for removing heat from a process fluid to condense the process fluid, the liquefaction system including a primary heat exchanger configured to remove heat from the process fluid via heat exchange with one or more refrigerants, a compressor configured to compress the one or more refrigerants, a first secondary heat exchanger configured to remove heat from the one or more refrigerants via heat exchange with ambient air, and a second secondary heat exchanger configured to remove heat from the one or more refrigerants via heat exchange with ambient water.

Abstract: There is disclosed at least one embodiment for a system for use in performing maintenance work on an unmanned offshore platform, comprising a sea-going support craft for transporting a maintenance crew to the platform for performing maintenance work on the platform, a power generator on the craft, and at least one operating device on the platform, where the platform has a line for supplying power from the power generator to the operating device.

Abstract: A system for use in performing maintenance work on an unmanned offshore platform, comprising a sea-going support craft (22) for transporting a maintenance crew to the platform (23) for performing maintenance work on the platform, a power generator (73) on the craft, at least one operating device (1, 72) on the platform, a line (18) connected to said operating device, and connector means (21) for connecting the line to the power generator (73) such that the latter can supply power to said operating device. Preferably, the or one of the operating devices is a hoisting apparatus (1) for raising the support craft to an elevated position, enabling the crew to transfer from the craft to the platform superstructure to carry out maintenance work.