Abstract: The invention relates to a method for cleaning equipment with a hollow sealed circuit and can be used in industry for cleaning equipment from salt measures, oil deposits, including asphalt paraffin, tar deposits and biological deposits. The claimed method of cleaning the inner surface of the equipment with a hollow sealed circuit consists in pumping a washing solution through an internal cavity of the said circuit with an unsteady flow regime created by local stops of the washing solution flow at the moment of oxygen or carbon dioxide gas formation, characterized by an intensity at which the pressure in the gas bubble moments of time, namely when the bubble grows, exceeds the pressure of the wash solution. The embodiment of the claimed method allows, while maintaining the cleaning efficiency, to significantly simplify its implementation and further expand the scope of use.

Abstract: A method is used for cleaning heat exchanger systems. The method is performed at a computer system having one or more processors and memory storing one or more programs configured for execution by the one or more processors. The method determines component percentages of a cleaning solution based, at least in part, on operational parameters of a heat exchanger system. The operational parameters include chemical composition of fluids passing through the heat exchanger system and operating temperatures of the fluids passing through the heat exchanger system. The component percentages of the cleaning solution include: (1) hydrogen peroxide. 2-90 wt. %: (2) a complexing agent. 3-30 wt. %: (3) water-soluble calixarene. 0.01-10 wt. %; and (4) water. The complexing agent includes a polybasic organic acid or a sodium salt thereof, or a derivative of phosphorous acid.

Abstract: Described here are multicopter systems and methods of operating multicopter systems, including those with a chassis with at least two mounted lift motors and at least four mounted control motors mounted within the chassis, wherein, the at least two mounted lift motors each having a lift propeller, the at least four mounted control motors each having a control propeller, wherein the lift propellers and the control propellers are in parallel planes or coplanar, a computer mounted on the chassis, the computer in communication with the control motors, an electric power source mounted on the chassis, the electric power source connected to the control motors, and an antennae mounted on the chassis, in communication with the computer. In some examples, the control systems are encrypted.

Abstract: Described here are multicopter systems and methods of operating multicopter systems, including those with a chassis with at least two mounted lift motors and at least four mounted control motors mounted within the chassis, wherein, the at least two mounted lift motors each having a lift propeller, the at least four mounted control motors each having a control propeller, wherein the lift propellers and the control propellers are in parallel planes or coplanar, a computer mounted on the chassis, the computer in communication with the control motors, an electric power source mounted on the chassis, the electric power source connected to the control motors, and an antennae mounted on the chassis, in communication with the computer. In some examples, the control systems are encrypted.