Abstract: An air curtain doorway defining an opening between at least two zones, including an air curtain having an air supply duct and an air return duct joined by a connecting duct. A frame having spaced apart jambs connected at the top by a header is configured to fit substantially within the opening of the air curtain. At least two roll-up doors in communication with the frame are configured to selectively insulate the at least first and second zones. A method of controlling a plurality of roll-up doors of an air curtain doorway comprises the steps of monitoring the output of at least a first sensor and a second sensor to sense approach of the doorway, applying logic to the output of the sensors, and controlling at least one of the doors based upon the result of the applied logic. The method can also include closing the roll-up doors while the air curtain is blowing, or turning off the air curtain and closing the roll-up doors.

Abstract: A submerged connection assembly for connecting an end of a pipeline to a flexible hose that runs to a SPM buoy including an elastic suspension arrangement between the SPM buoy and the connection assembly.

Abstract: An air curtain providing an air stream across a doorway between areas of relatively cool and warm air masses and continuously monitoring the condition, e.g., temperature, pressure and flow rate, of one or both air masses and the air stream. The air curtain has a control system including an electronic controller operating a heater and fan and receiving air characteristic inputs from temperature, pressure and flow rate sensors. The controller monitors these inputs continuously and processes them to operate the heater and fan according to algorithms designed to minimize air cross-filtration and energy consumption while maintaining the temperature and humidity of the air stream at a point substantially along a line representing the mixing of anteroom air and the air stream that is substantially tangent to the psychrometric saturation curve.

Abstract: A submerged connection assembly for connecting an end of a pipeline to a flexible hose that runs to a SPM buoy including an elastic suspension arrangement between the SPM buoy and the connection assembly.