Patent Number: 
Section: claims

1. Heat exchanger tube spacing device consisting of at least one supporting spacer grid consisting of a cylindrical shell and at least two tiers of plates spaced apart at a preset gap, while the width of each plate lies within the plane which is parallel to the shell axis; ends of all plates are fixed to the shell in such a way that plates of any tier are located at the preset gap being parallel to each other; plates of different tiers are criss-crossed at an angle of 60 degrees when observing along the shell axis, and are fastened together at the crossing points; wherein the sum of the preset gap between plates and the thickness of each plate is equal to the spacing of heat exchanger tubes. 2. The device according to claim 1, wherein the preset gap between plates is less than heat exchanger tube diameter by a corresponding drilling or reaming allowance of each cell formed by criss-crossed plates of both tiers when observing along the shell axis. 3. The device according to claim 1, wherein each supporting spacer grid is designed for independent use, and the width of plates in both tiers is the same. 4. The device according to claim 1, wherein two supporting spacer grids are designed to be used in combination, while the width of plates in one tier of each supporting spacer grid is less than that of plates of the other tier which are turned clockwise against narrower plates when observing along the shell axis, and both supporting spacer grids are coupled in such a way as to align ends of narrower plates in corresponding sections. 5. A heat exchanger tube spacing device consisting of at least one supporting spacer grid consisting of a round-shaped cylindrical shell and at least two tiers of plates spaced apart at a preset gap and include three dividers running through the cylinder axis; ends of these dividers are connected to the shell with the shift which makes an angle of 60 degrees; moreover, the width of each plate lies within the plane which is parallel to the shell axis; ends of plates of one section in each tier are connected either to the shell and one of the dividers, or to the adjacent dividers in such a way that plates of any section in each tier are spaced apart at a preset gap being parallel to each other and to the divider which they are not connected to; plates in both tiers are criss-crossed at an angle of 60 degrees when observing along the shell axis, and are fastened together at crossing points. 6. The device according to claim 5, wherein the sum of the preset gap between plates in any section and the thickness of each plate is equal to the spacing of heat exchanger tubes. 7. The device according to claim 6, wherein the preset gap between plates in any section is less than heat exchanger tube diameter by a corresponding drilling or reaming allowance of each cell formed by criss-crossed plates of both tiers when observing along the shell axis. 8. The device according to claim 5, wherein each supporting spacer grid is designed for independent use, and the width of plates in both tiers is the same. 9. The device according to claim 5, wherein two supporting spacer grids are designed to be used in combination, while the width of plates in one tier of each supporting spacer grid is less than that of plates of the other tier which are turned clockwise against narrower plates when observing along the shell axis, and both supporting spacer grids are coupled in such a way as to align ends of narrower plates in corresponding sections. 10. The device according to claim 5, wherein dividers in both tiers are integral.