METAL THERMAL INSULATION (MTI) Russian patent published in 2023 - IPC F16L59/14 

FIELD: metal thermal insulation.

SUBSTANCE: invention is related to metal thermal insulation (MTI) of equipment and pipelines of nuclear power plants (NPP). MTI is made of heat-insulating blocks. Each MTI block is filled with filtered air and contains a set of standardized coaxial self-attaching cylindrical membranes made of stainless steel sheet with a thickness of 0.07-0.1 mm. The cover and side walls of the blocks are made of stainless steel with a thickness of 0.2-0.4 mm, the bottom - with a thickness of 0.1-0.2 mm. The membranes form chambers of air layers of the block with a thickness of less than 15 mm. The surfaces of the membranes are made convexly directed through a unified movable coordinate wire grid with fixed movable hollow cylindrical gauges. This relieves the membranes as much as possible from the effects of temperature and force factors. The side walls of the covers of adjacent blocks are connected to each other using hook tips attached to the corners of the walls of the block covers. When four adjacent sectors of the hook tips are assembled, a single body of rotation is formed, self-sealing in a removable funnel-gripper. The side walls of the bottoms of four adjacent blocks are connected to each other using guide cylindrical pins attached to the bottom of the block and fit tightly into the four sockets of the centring metal socket. Proposed MTI design reduces the weight of thermal insulation in comparison with the used thermal insulation installed on nuclear power plant units. The thickness of the thermal insulation blocks was reduced from 160 to 96 mm with a simultaneous increase in radiation protection against gamma radiation.

EEFECT: efficiency and reliability of safety systems in case of accidents associated with primary circuit decompression have been increased.

1 cl, 12 dwg