Collector for injection or drainage of gas from apparatus for air- based cooling of gas

FIELD: power engineering, in particular, heat exchange devices, primarily, air-based gas cooling apparatuses.

SUBSTANCE: device is made in form of reservoir working under pressure, including cylindrical body with end portions of two-side curvature, central branch pipe for connection to gas main and branch pipes for connecting to chambers for inlet or outlet of gas of heat-exchange sections of air gas cooling apparatus, while cylindrical body is made of technological sections, central one of which is made primarily in form of unified technological element with central branch pipe, and branch pipes for connection to chambers for inlet and outlet of gas of heat exchange sections of air gas cooling apparatus are mainly symmetrically positioned on both sides from central technological section and number of these branch pipes on each side ranges from 2 to 8, while the area of cross-section in light of central branch pipe is 0,7-1,0 of area of cross-section in light of cylindrical portion of body of collector fro injection or drainage of gas, and total area of cross section in light of branch pipes for connection to chamber for inlet or outlet of gas of each heat-exchange section of air-based gas cooling apparatus is 0,37-0,62 of area of cross-section in light of cylindrical portion of body of collector for injection or drainage of gas.

EFFECT: decreased metal cost of gas injection or drainage collector and higher manufacturability of its construction, and also decreased hydraulic losses in collector for injection or drainage of gas.

3 dwg, 7 cl

 

The invention relates to the field of energy, namely the heat-exchange apparatus, particularly apparatus for air cooling of the gas.

The closest analogue of the invention is the collector inlet or gas outlet of the air cooling of the gas (see Fundamentals of calculation and design of heat exchanger for air cooling. edit Webcounter, Anelssono, St. Petersburg: Nedra - 1996, p.84, RIS), made in the form of a vessel operating under pressure and comprising a cylindrical body with end sections, the Central inlet or outlet pipe for connection respectively with the feed or discharge gas line and fittings for connection respectively with the chambers of the inlet or outlet of the heat exchange sections of the air cooling of the gas.

The present invention is to reduce the metal consumption and labor, improving the manufacturability of the collector inlet or gas outlet, and also the reduction of hydraulic losses.

The problem is solved due to the fact that the collector inlet or gas outlet of the air cooling gas according to the invention is made in the form of a vessel operating under pressure, comprising a cylindrical housing with end sections of double curvature, a Central pipe for the connection with the pipeline and the pipe is to connect with cameras inlet or gas outlet of the heat exchange sections of the air cooling of the gas, moreover, the cylindrical body is made of technological sections, the Central one of which is made mainly in the form of a single process element with a Central pipe, and a pipe for connection to the camera input or output gas heat exchange sections of the air cooling gas mainly symmetrically located on both sides of the Central processing section and the number of nozzles on each side is from 2 to 8, while the cross-sectional area in the light of the Central pipe is 0.7 to 1.0 cross-sectional area in the light of the cylindrical part of the body of the manifold inlet or gas outlet, and the total cross-sectional area in the light sockets for the connection with the camera inlet or gas outlet of each heat exchange section air cooler gas is from 0.37 to 0.62 cross-sectional area in the light of the cylindrical part of the body of the manifold inlet or gas outlet.

The Central processing section of the cylindrical casing and the Central tube can be designed as a seamless element.

Each nipple for connection with cameras inlet or gas outlet of the heat exchange section air cooler gas can be made consisting of the cylindrical part and the adjacent flange of the advantages of the military collar, in the zone of adjacency to the cylindrical part of the nozzle internal diameter of the Central hole of the flange coincides with the inner diameter of the cylindrical part of the pipe, and the outer diameter of the cylindrical part of the socket is a 0.27-0,59 from the outer diameter of the cylindrical part of the casing of the collector inlet or gas outlet.

The Central hole of the collar flange in the area of joining of joined with the element chamber inlet or gas outlet of the heat exchange section can be performed with a conical extension angle of the generatrix of contact of the plane of the flange constituting 72-87°.

The length of the Central processing section of the housing of the collector inlet or gas outlet is 0.45-0.74 and the distance between the axes closest to her nipples for connection to the camera input or output gas heat exchange sections of the air cooling of the gas.

Most remote from the Central processing section of the housing of the collector inlet or gas outlet pipe for connection with the corresponding camera input or output gas heat exchange section air cooler gas is located at a distance of its axis from the nearest end of the process section, in which he posted a smaller diameter cylindrical part of the socket.

The distance between the axes of the extreme the x pipes, intended for connection with the chamber inlet or outlet gas of the first heat exchange section air cooler gas does not exceed 0,81 width of the heat exchange section air cooler gas.

The technical result provided by the present set of essential features, is to reduce the metal collector supply or exhaust gas and improving the manufacturability of its design, as well as in the reduction of hydraulic losses in the collector inlet or gas outlet.

The invention is illustrated by drawings, where:

figure 1 shows the collector inlet or gas outlet, side view;

figure 2 - manifold inlet or gas outlet, end view;

figure 3 is a view along a-a in figure 1, fragment.

The collector inlet or gas outlet of the air cooling of the gas made in the form of a vessel operating under pressure, comprising a cylindrical housing 1 with end areas 2 double curvature, the Central pipe 3 for connection with the gas pipeline and the branch pipes 4 for connection respectively with the chambers of the inlet or gas outlet (not shown) of the heat exchange sections (not shown) of the air cooling of the gas.

Cylindrical body 1 formed of interconnected technological sections 5, 6, 7. The Central processing section 5, the issue is Lana mainly in the form of a single process element (in one piece) with the Central pipe 3.

The nozzles 4 for connection with the camera input or output gas heat exchange sections of the air cooler gas are predominantly located symmetrically on either side of the center section. The number of nozzles 4 on each side of the Central section is from 2 to 8.

The cross-sectional area in the light of the Central pipe 3 is 0.7 to 1.0 cross-sectional area in the light of the cylindrical part of the housing 1 collector inlet or gas outlet.

The total cross-sectional area in the light of nozzles 4 for connection with cameras inlet or gas outlet of each heat exchange section air cooler gas is from 0.37 to 0.62 cross-sectional area in the light of the cylindrical part of the housing 1 collector inlet or gas outlet.

The Central processing section 5 of the cylindrical body 1 and the Central pipe 3 can be designed as a seamless element.

Each branch pipe 4 for connection with the chamber inlet or gas outlet of the heat exchange section air cooler gas can be made consisting of a cylindrical part 8, which adjoins the flange 9 predominantly collar. The inner diameter of the Central hole of the flange 9 in the zone of adjacency to the cylindrical part of the nozzle coincides with the inner diameter of the cylindrical h the STI 8 of the socket 4. The outer diameter of the cylindrical part 8 of the socket 4 is a 0.27-0,59 from the outer diameter of the cylindrical part of the housing 1 collector inlet or gas outlet.

The Central hole of the collar flange 9 in the area of joining of joined with the element chamber inlet or gas outlet of the heat exchange section air cooler gas (abutting element not shown) may have a tapered extension 10 with angle α the inclination of the generatrix of contact of the plane of the flange 9, components α=72-87°.

The length of the Central processing section 5 case collector inlet or gas outlet may be of 0.45-0.74 and the distance between the axes of the nearest branch pipes 4 for connection with the camera input or output gas heat exchange sections of the air cooling of the gas.

Most remote from the Central processing section of the housing of the collector inlet or gas outlet pipe 4 for connection with the corresponding camera input or output gas heat exchange section air cooler gas can be located at a distance of its axis from the nearest edge technological sections, for example section 6 or 7, in which it posted a smaller diameter cylindrical portion 8 of the socket.

The distance between the axes of the extreme of the branch pipes 4, intended for connection by Scamaroni inlet or outlet gas of the first heat exchange section air cooler gas, preferably does not exceed 0,81 width of the heat exchange section air cooler gas.

The collector inlet or gas outlet of the air cooling of the gas works in the following way. When submitting requiring cooling of the main gas through the Central pipe at the manifold inlet gas air cooler gas is a redistribution of gas in the reservoir, and the gas flows through tubes to connect with chambers gas inlet of the heat exchange sections of the air cooling gas into the appropriate chamber of the gas inlet. Next, the gas is cooled in a bundle of heat exchange tubes and getting into a chamber gas outlet of the heat exchange sections of the air cooling, is collected in a collector gas outlet, where through the Central pipe enters cooled in the main pipeline.

When the flow of cooling fluid (air) as a bundle of finned heat exchange tubes, which transport natural gas, is flowing around the tube bundle air and contact heat exchange. Thus by optimizing the parameters of the collector inlet or gas outlet of the air cooling gas increases the uniformity of gas flow in pipes, which generally affects the reduction of pressure loss for gas in the designed mode of operation of the air cooler to 0.02 MPa.

p> 1. The collector inlet or gas outlet of the air cooling of the gas, characterized in that it is made in the form of a vessel operating under pressure, comprising a cylindrical housing with end sections of double curvature, a Central pipe for connection to a gas line and fittings to connect to the camera input or output gas heat exchange sections of the air cooling of the gas, and the cylindrical body is made of technological sections, the Central one of which is made mainly in the form of a single process element with a Central pipe, and pipes for connecting with cameras inlet or gas outlet of the heat exchange section air cooler gas mainly symmetrically located on both sides of the from the Central processing section and the number of nozzles on each side is from 2 to 8, while the cross-sectional area in the light of the Central pipe is 0.7 to 1.0 cross-sectional area in the light of the cylindrical part of the body of the manifold inlet or gas outlet, and the total cross-sectional area in the light sockets for connection with the chamber inlet or gas outlet of each heat exchange section air cooler gas is from 0.37 to 0.62 cross-sectional area in the light of the cylindrical part of the body you call the Torah inlet or gas outlet.

2. Collector according to claim 1, characterized in that the Central processing section of the cylindrical casing and the Central tube is designed as a seamless element.

3. Collector according to claim 1, characterized in that each nozzle for connection with cameras inlet or gas outlet of the heat exchange section air cooler gas is made consisting of the cylindrical part and the adjacent flange, primarily collar, in the zone of adjacency to the cylindrical part of the socket inner diameter of the flange coincides with the inner diameter of the cylindrical part of the pipe, and the outer diameter of the cylindrical part of the socket is a 0.27-0.59 is the outer diameter of the cylindrical part of the casing of the collector inlet or gas outlet.

4. Collector according to claim 3, characterized in that the Central hole of the collar flange in the area of joining of joined with the element chamber inlet or outlet gas heat transfer section is made with a conical extension angle of the generatrix of contact of the plane of the flange constituting 72-87°.

5. Collector according to claim 1, characterized in that the length of the Central processing section of the housing of the collector inlet or gas outlet is 0.45-0.74 and the distance between the axes closest to her nipples for connection to the camera input or output gas heat e is constant section of the air cooling of the gas.

6. Collector according to claim 1, characterized in that the most remote from the Central processing section of the housing of the collector inlet or gas outlet pipe for connection with the corresponding camera input or output gas heat exchange section air cooler gas is located at a distance of its axis from the nearest end of the process section, in which he posted a smaller diameter cylindrical part of the socket.

7. Collector according to claim 1, characterized in that the distance between the axes of the outermost nozzles intended for connection with the chamber inlet or outlet gas of the first heat exchange section air cooler gas does not exceed 0,81 width of the heat exchange section air cooler gas.



 

Same patents:

FIELD: power engineering, in particular, engineering of collectors for devices for utilization of gases exhausted by apparatuses primarily used for heating air by combustion products, coming from compressor of gas-turbine plant of gas flow apparatus at compressor stations of main gas pipelines.

SUBSTANCE: air injection or drainage collector of heat exchange block of heat-exchange apparatus like regenerative air heater is made in form of cylindrical ring with opening, in which additional pipe board is welded, while projection on end of pipe board of curvilinear portion of ring, forming an end of opening, is positioned within limits of thickness of pipe board, connection of ring to pipe board in plane of ring cross-section is made within angular range γ=28°-75°, and relation of projection area on aforementioned plane of curvilinear ring portion, forming an end of opening, to projection area on this plane of appropriate end of pipe board, is 0,048-0,172.

EFFECT: decreased mass of construction, high manufacturability of same, possibly lower laboriousness of manufacture, high durability of injection and drainage collector and reliability of its operation due to higher rigidity of construction.

5 cl, 4 dwg

FIELD: heat exchange apparatus; chemical industry and power engineering.

SUBSTANCE: proposed manifold has body with distributor secured on it. Secured to non-magnetic body are magnetic coils; distributor consists of movable and rigidly secured screens made from magnetic material with porous medium placed in between them. Porous medium may be made from foamed plastic and at least 5 rows of elastic balls whose diameter exceeds pitch of screen; it may include at least four layers of ferrite particles at effective diameter equal to diameter of elastic balls.

EFFECT: possibility of performing control of flows in wide temperature range.

4 cl, 9 dwg

FIELD: heat power engineering.

SUBSTANCE: the inventions are intended for heating water and-or steam and may be used in heat power engineering. The boiler plant contains a cylindrical boiler having one course of gases and an internal cylindrical shielded furnace chamber, an air heater, controlled circuits of heating of a heat carrier and fuels, one and more rows of heat exchange pipes, a ring-shaped cylindrical sectional header and a contact economizer. The finned heat exchange pipes are made U-shaped or coiled and form in the end part of the furnace chamber a radiation-convective beam. At that the gas-tightness of the furnace chamber may be ensured either by heat exchange diaphragms connecting the heat exchange pipes or by a heat exchange cylindrical surface. The heat exchange diaphragms, as well as the heat exchange cylindrical surface, which is sealing the furnace chamber and the convective part of the boiler, are spread to the frontal collector. On the collector there are outlet branch-pipes for withdrawal of the heat carrier, from which it is simultaneously possible to take the heat-carrier of several parameters. The boiler plant is countercurrent in respect to a temperature pressure of the furnace chamber and has one and more supporting devices. The back butt of the furnace chamber serves a part of a heating surface of the air-heater together with a branch-pipe of the outlet of the combustion products. The boiler and its heat-exchange pipes are made with in an series heating of the heat-carrier at the speed of its movement in the heat-exchange pipes of 2.15 m\s. The ring-shaped finned boiler header has sections, which are formed by partitions both blank and perforated, one and more frontal covers, one and more pipe plates, on which the heat-exchange pipes of the boiler are fixed. A part of the partitions is made flat and a part of the partitions is made as a ring or a part of a ring. The external finned frontal side of a collector is a part of the heating surface of the air heater. Inventions ensure increased efficiency of the boiler gross load and expansion of its functionalities.

EFFECT: the inventions ensure increased efficiency of the boiler gross load and expansion of its functionalities.

20 cl, 27 dwg

FIELD: heat-power engineering; power engineering; chemical and oil industries.

SUBSTANCE: proposed chamber is provided with rods having section in form of rectangle; rods are mounted over entire perimeter of tube bank in parallel with tubes; vertices of adjacent faces directed towards each other form diffuser and contraction passages. Vertices of faces of adjacent rods directed towards each other may be rounded-off.

EFFECT: reduced hydraulic resistance and enhanced reliability.

2 cl, 3 dwg

FIELD: heat-power engineering; heat exchangers with mixing of heat-transfer agent flows at different temperatures.

SUBSTANCE: circular partition is provided with circular V-shaped box smoothly perforated over perimeter and located above holes of heat-transfer agent inlet branch pipes; vertex of V-shaped box is rigidly connected with circular partition and end faces of box are tightly connected with inner surface of body and outer surface of casing.

EFFECT: reduced hydraulic resistance at simultaneous reduction of usage of metal.

5 cl, 4 dwg

FIELD: heat-exchange apparatus; liquid-to-liquid heat exchangers.

SUBSTANCE: collector chamber of shell-and-tube heat exchanger adjoining the tube sheet of tube bank includes partitions dividing it into supply and discharge compartments; they have U-shaped profile with strip located between its runs; it is made from elastic material; one end of strip is secured on tube sheet and second end is bent at 180 deg. on side of supply compartment.

EFFECT: enhanced operational reliability.

Regenerative cooler // 2142608
The invention relates to refrigeration, and more particularly to regenerative coolers, and in the particular case of the coolers used in such systems in which the refrigerant is air, and the cooled medium - oil

FIELD: heat-exchange apparatus; liquid-to-liquid heat exchangers.

SUBSTANCE: collector chamber of shell-and-tube heat exchanger adjoining the tube sheet of tube bank includes partitions dividing it into supply and discharge compartments; they have U-shaped profile with strip located between its runs; it is made from elastic material; one end of strip is secured on tube sheet and second end is bent at 180 deg. on side of supply compartment.

EFFECT: enhanced operational reliability.

FIELD: heat-power engineering; heat exchangers with mixing of heat-transfer agent flows at different temperatures.

SUBSTANCE: circular partition is provided with circular V-shaped box smoothly perforated over perimeter and located above holes of heat-transfer agent inlet branch pipes; vertex of V-shaped box is rigidly connected with circular partition and end faces of box are tightly connected with inner surface of body and outer surface of casing.

EFFECT: reduced hydraulic resistance at simultaneous reduction of usage of metal.

5 cl, 4 dwg

FIELD: heat-power engineering; power engineering; chemical and oil industries.

SUBSTANCE: proposed chamber is provided with rods having section in form of rectangle; rods are mounted over entire perimeter of tube bank in parallel with tubes; vertices of adjacent faces directed towards each other form diffuser and contraction passages. Vertices of faces of adjacent rods directed towards each other may be rounded-off.

EFFECT: reduced hydraulic resistance and enhanced reliability.

2 cl, 3 dwg

FIELD: heat power engineering.

SUBSTANCE: the inventions are intended for heating water and-or steam and may be used in heat power engineering. The boiler plant contains a cylindrical boiler having one course of gases and an internal cylindrical shielded furnace chamber, an air heater, controlled circuits of heating of a heat carrier and fuels, one and more rows of heat exchange pipes, a ring-shaped cylindrical sectional header and a contact economizer. The finned heat exchange pipes are made U-shaped or coiled and form in the end part of the furnace chamber a radiation-convective beam. At that the gas-tightness of the furnace chamber may be ensured either by heat exchange diaphragms connecting the heat exchange pipes or by a heat exchange cylindrical surface. The heat exchange diaphragms, as well as the heat exchange cylindrical surface, which is sealing the furnace chamber and the convective part of the boiler, are spread to the frontal collector. On the collector there are outlet branch-pipes for withdrawal of the heat carrier, from which it is simultaneously possible to take the heat-carrier of several parameters. The boiler plant is countercurrent in respect to a temperature pressure of the furnace chamber and has one and more supporting devices. The back butt of the furnace chamber serves a part of a heating surface of the air-heater together with a branch-pipe of the outlet of the combustion products. The boiler and its heat-exchange pipes are made with in an series heating of the heat-carrier at the speed of its movement in the heat-exchange pipes of 2.15 m\s. The ring-shaped finned boiler header has sections, which are formed by partitions both blank and perforated, one and more frontal covers, one and more pipe plates, on which the heat-exchange pipes of the boiler are fixed. A part of the partitions is made flat and a part of the partitions is made as a ring or a part of a ring. The external finned frontal side of a collector is a part of the heating surface of the air heater. Inventions ensure increased efficiency of the boiler gross load and expansion of its functionalities.

EFFECT: the inventions ensure increased efficiency of the boiler gross load and expansion of its functionalities.

20 cl, 27 dwg

FIELD: heat exchange apparatus; chemical industry and power engineering.

SUBSTANCE: proposed manifold has body with distributor secured on it. Secured to non-magnetic body are magnetic coils; distributor consists of movable and rigidly secured screens made from magnetic material with porous medium placed in between them. Porous medium may be made from foamed plastic and at least 5 rows of elastic balls whose diameter exceeds pitch of screen; it may include at least four layers of ferrite particles at effective diameter equal to diameter of elastic balls.

EFFECT: possibility of performing control of flows in wide temperature range.

4 cl, 9 dwg

FIELD: power engineering, in particular, engineering of collectors for devices for utilization of gases exhausted by apparatuses primarily used for heating air by combustion products, coming from compressor of gas-turbine plant of gas flow apparatus at compressor stations of main gas pipelines.

SUBSTANCE: air injection or drainage collector of heat exchange block of heat-exchange apparatus like regenerative air heater is made in form of cylindrical ring with opening, in which additional pipe board is welded, while projection on end of pipe board of curvilinear portion of ring, forming an end of opening, is positioned within limits of thickness of pipe board, connection of ring to pipe board in plane of ring cross-section is made within angular range γ=28°-75°, and relation of projection area on aforementioned plane of curvilinear ring portion, forming an end of opening, to projection area on this plane of appropriate end of pipe board, is 0,048-0,172.

EFFECT: decreased mass of construction, high manufacturability of same, possibly lower laboriousness of manufacture, high durability of injection and drainage collector and reliability of its operation due to higher rigidity of construction.

5 cl, 4 dwg

FIELD: power engineering, in particular, heat exchange devices, primarily, air-based gas cooling apparatuses.

SUBSTANCE: device is made in form of reservoir working under pressure, including cylindrical body with end portions of two-side curvature, central branch pipe for connection to gas main and branch pipes for connecting to chambers for inlet or outlet of gas of heat-exchange sections of air gas cooling apparatus, while cylindrical body is made of technological sections, central one of which is made primarily in form of unified technological element with central branch pipe, and branch pipes for connection to chambers for inlet and outlet of gas of heat exchange sections of air gas cooling apparatus are mainly symmetrically positioned on both sides from central technological section and number of these branch pipes on each side ranges from 2 to 8, while the area of cross-section in light of central branch pipe is 0,7-1,0 of area of cross-section in light of cylindrical portion of body of collector fro injection or drainage of gas, and total area of cross section in light of branch pipes for connection to chamber for inlet or outlet of gas of each heat-exchange section of air-based gas cooling apparatus is 0,37-0,62 of area of cross-section in light of cylindrical portion of body of collector for injection or drainage of gas.

EFFECT: decreased metal cost of gas injection or drainage collector and higher manufacturability of its construction, and also decreased hydraulic losses in collector for injection or drainage of gas.

3 dwg, 7 cl

FIELD: power engineering, particularly gas cooling plant components.

SUBSTANCE: gas inlet or outlet chamber is made as a high-pressure tank and comprises side, upper, lower and end walls. Gas inlet or outlet chamber also comprises not less than two load-bearing partitions arranged between side walls and provided with through orifices. One chamber wall is made as tube plate with orifices defining grid structure and adapted to receive heat-exchanging tube ends. One chamber wall has orifices to receive pies to connect thereof with gas inlet or outlet manifold, which supplies gas to or discharges gas from the chamber. Orifices for connection pipe receiving, load-bearing partition orifices and tube plate orifices define communication system to connect gas air cooling plant with gas pipeline. The communication system has several stages with orifices formed so that orifice number at each stage successively changes in gas flow direction. For gas inlet chamber above number increases, for gas outlet chamber the number decreases.

EFFECT: possibility to equalize velocity field, reduced hydraulic hammer, which results in reduced power losses in pipeline conveying gas to be cooled and in increased thermal performance of air cooling plant as a whole or air cooling plant section, increased economy of plant production and operation.

3 dwg, 13 cl

FIELD: engineering of collectors for injection or drainage of gas for apparatuses for air-based gas cooling.

SUBSTANCE: device has bearing frame, on which not less than three cradle supports are mounted for supporting body of collector for injection or drainage of gas and for abutment of branch pipe connected thereto for connection to gas main, and no less than four portal supports for temporary technological holding by plane, rotation angle and position along collector for injection or drainage of gas of branch pipes with flanges for connection to chambers for inlet or outlet of gas of heat-exchange sections of air-based gas cooling apparatus adequately to position of contact surfaces of response flanges and mounting apertures in them in chamber for inlet or outlet of gas. At least two cradle supports are positioned with possible abutment of body of collector for injection or drainage of gas against them in accordance to suspension scheme, each one primarily between additional pair of portal supports, mounted below outmost and adjacent flanges of branch pipes for connection to chambers for inlet or outlet of gas. Each portal support is made with detachable beam, which is provided with device for temporary holding by plane and rotation angle of flange of appropriate branch pipe and for connection of it to body of collector for injection or drainage of gas in planned position.

EFFECT: simplified construction of building berth while providing for high precision of manufacturing of collector for drainage or injection of gas.

4 cl, 4 dwg

FIELD: heat and power engineering, namely tube walls of inlet or outlet chambers of apparatus for air cooling of gas or section of such apparatus.

SUBSTANCE: tube plate of chamber of gas inlet or gas outlet of heat exchange section of apparatus for air cooling of gas includes plate in the form of parallelepiped, mainly right-angled one. Said plate includes system of through openings for ends of heat exchange tubes of tube bundle. Said openings are arranged by rows along height of wall at pitch of their axes in row being in range (1.7 - 3.4) d; at pitch of rows along height of wall being in range (1.6 - 3.4)d where d - diameter of openings. Said openings are shifted in adjacent rows by value 0.35 -0.65 of pitch in row. Projection of surface area of wall carcass onto mean plane of tube wall exceeds by 4 - 12.5 times projection of total surface area of voids of wall on the same plane. Portion of continuous cross section is arranged along perimeter of tube wall for forming rigidity band of tube wall. Surface area of rigidity band consists 16.0 - 45.0% of tube wall surface area.

EFFECT: enhanced strength, lowered metal consumption of construction due to optimal parameters of tube wall.

10 cl, 3 dwg

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