SE2350875A1 - Method for producing spiral heat exchangers of various lengths - Google Patents

Method for producing spiral heat exchangers of various lengths

Info

Publication number
SE2350875A1
SE2350875A1 SE2350875A SE2350875A SE2350875A1 SE 2350875 A1 SE2350875 A1 SE 2350875A1 SE 2350875 A SE2350875 A SE 2350875A SE 2350875 A SE2350875 A SE 2350875A SE 2350875 A1 SE2350875 A1 SE 2350875A1
Authority
SE
Sweden
Prior art keywords
tube
length
tubing
lengths
spiral
Prior art date
Application number
SE2350875A
Other languages
Swedish (sv)
Inventor
Thor Frölich Braathen
Original Assignee
Braathen Thor F
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Braathen Thor F filed Critical Braathen Thor F
Publication of SE2350875A1 publication Critical patent/SE2350875A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0818—Manufacture of tubes by drawing of strip material through dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0472—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Wire Processing (AREA)

Abstract

Abstract A method for producing spiral heat exchangers of various lengths, wherein tube elements (1) are profile rolled and weided to seam weided tube lengths (21) of stainless steel, the tube lengths (27) are conveyed from the tube rolling mill (2- 9) to a rolling path (11, 11b), that each tube length is cut (10) to a predetermined length and is displaced in a sideways manner to a tubing collector (12b), that a collection of tube lengths (27) with equal length are lifted with the assistance of at least an overhead crane (21, 22, 23) with a lifting yoke (24, 25, 26) and is transported to a tubing storage, wherein tubing of various lengths are stored separately from each other, that a tube length is collected out of the tubing storage, that the tube length is coiled to a helical spiral and any excess length is cut, wherein the tube length is selected on the condition that it has the shortest excess length in comparison to the length of the spiral, or the sum av the length of a number of spirals, to be produced from the tube length.

Description

METHOD FOR PRODUCING SPIRAL HEAT EXCHANGERS OF VÅRIOUS LENGTHS Technical Field id="p-1" id="p-1" id="p-1" id="p-1" id="p-1" id="p-1" id="p-1" id="p-1" id="p-1"
[0001] exchangers for hot water tanks in a tube profile mill that is adapted to produce The present invention relates to production of spiral heat seam welded stainless tube Iengths with various Iengths, i.e., between 3 and 60 meters. More specifically the invention relates to a method for producing stainless seam welded tubes of various Iengths for applications in spiral heat exchangers. Background Art id="p-2" id="p-2" id="p-2" id="p-2" id="p-2" id="p-2" id="p-2" id="p-2" id="p-2"
[0002] arranged to produce tubes with standard Iengths at e.g., up to 12.5 meters.
Current tube rolling mill for seam welded stainless tubing are Very few rolling mills produce tubing Iengths with length beyond that. The tube Iengths are usually transported in containers with the Iengths of 40 feet, in other words 12.19 meters. Already at the transportation of 12.50 meters there will be problems to fit the tube Iengths in a 40-foot container, and tube Iengths beyond that will not be possible to transport in similar fashion. id="p-3" id="p-3" id="p-3" id="p-3" id="p-3" id="p-3" id="p-3" id="p-3" id="p-3"
[0003] provided in standard Iengths, it would most likely occur that excessive Iengths Another problem is that since the tube Iengths are already from the Iengths that are required, will have to be cut off. E.g., if the client requires a tube length of 9 meters, over 3 three meters of the original length will be disposed of. lf the client requires longer Iengths, one will often have to join Iengths by welding. ln addition to that it is time consuming to make a circular weld, the weld forms a weakened area in a tube and the weld is more exposed to i.e., corrosion, and such welded tubing must therefore be monitored closely. However, this is not possible when the tube is located in a hot water tank. id="p-4" id="p-4" id="p-4" id="p-4" id="p-4" id="p-4" id="p-4" id="p-4" id="p-4"
[0004] should not be bent and later be straightened out. Internal stress will occur in the Stainless steel that are used for the production of heating spirals material which may lead to stress corrosion. lt is therefore not appropriate to bend the tubes for transport. id="p-5" id="p-5" id="p-5" id="p-5" id="p-5" id="p-5" id="p-5" id="p-5" id="p-5"
[0005] spirals in one continuous process. This is currently not possible, since the seam ldeally one should produce the tubes and coi| them to heating welded tubes must undergo a heat treatment with a following controlled cooling to remove the stresses after welding. lf the tubes are subjected to bending before the stresses are removed, the weld will be weakened. id="p-6" id="p-6" id="p-6" id="p-6" id="p-6" id="p-6" id="p-6" id="p-6" id="p-6"
[0006] Specific prior art will hereby be mentioned: id="p-7" id="p-7" id="p-7" id="p-7" id="p-7" id="p-7" id="p-7" id="p-7" id="p-7"
[0007] aluminum tubes. lt comprise an extruding machine, a pulling machine and rails CN111922115, which describes a production facility for extruding for handling of the finished tubes. The publication does not specify the lengths of the tubes, but the figures show tubes where all are of the same lengths. Such extruded aluminum tubes are not suitable for use in spiral heat exchangers. id="p-8" id="p-8" id="p-8" id="p-8" id="p-8" id="p-8" id="p-8" id="p-8" id="p-8"
[0008] US2015/0307328, which describes a lifting yoke used together with a crane. The yoke is intended to lift extended objects, the Yoke is equipped with sensors and can be adjusted to keep the object in balance. The objects are lifted only at two points, and the yoke is therefore only suitable to lift solid and rigid objects. [0009] wind generator. The yoke is designed to counteract deformation during the CN112125122, which describes a lifting yoke for lifting parts of a lifting. However, the yoke only lifts the object in to points, and hence the objects to be lifted must have a certain stiffness. id="p-10" id="p-10" id="p-10" id="p-10" id="p-10" id="p-10" id="p-10" id="p-10" id="p-10"
[0010] seamless stainless steel tube with a length of 50 meters. Since the tube is not CN107377666, which describes a method for producing a coiled seam welded it is possible to coi| it straight after profile rolling and pulling. id="p-11" id="p-11" id="p-11" id="p-11" id="p-11" id="p-11" id="p-11" id="p-11" id="p-11"
[0011] CN101797602, which describes the production of a coiled stainless seam welded steel tube with a length of between 15 and 133 meters. Here the coiling of the tube is done immediately after the profile milling and seam welding. This will introduce additional stress in the tube. When the tube is later used for production of products it has to be uncoiled and coiled again. This will introduce even more stress in the tube. The tube will then not be suitable for use as a heating spiral in a hot water tank. The only way to reduce stress is to provide heat treatment of the tube. The tube could still have acquired microscopic cracks at in the weld and will therefore be permanently structurally weakened.
Summary of invention id="p-12" id="p-12" id="p-12" id="p-12" id="p-12" id="p-12" id="p-12" id="p-12" id="p-12"
[0012] the production excessive tube cuttings when tubings are adapted to a preferred The object of the present invention is to solve the challenges of length, and remove or significantly reduce the need of joining tubing, also when there is need for long tubing lengths of e.g. up to 60 meters. id="p-13" id="p-13" id="p-13" id="p-13" id="p-13" id="p-13" id="p-13" id="p-13" id="p-13"
[0013] appropriate handling of long tubing from the metalworks to the bending machine The object of the present invention is to also provide an and the latter transportation. [0014] Said objects are achieved in the following description and claims. Brief description of drawings id="p-15" id="p-15" id="p-15" id="p-15" id="p-15" id="p-15" id="p-15" id="p-15" id="p-15"
[0015] path, wherein Figures 1a - d shows a tube rolling mill with accompanying rolling id="p-16" id="p-16" id="p-16" id="p-16" id="p-16" id="p-16" id="p-16" id="p-16" id="p-16"
[0016] Figure 1a shows the tube rolling mill and a part of the rolling path in view, id="p-17" id="p-17" id="p-17" id="p-17" id="p-17" id="p-17" id="p-17" id="p-17" id="p-17"
[0017] Figure 1b shows the same as in figure 1a but in planar view, [0018] Figure 1c shows the rest of the rolling path in view and figure 1d shows the same as in figure 1c but in planar view, [0019] Figure 2 shows several lifting yokes about to lift a bundle of tubing. Detailed description of the invention id="p-20" id="p-20" id="p-20" id="p-20" id="p-20" id="p-20" id="p-20" id="p-20" id="p-20"
[0020] of tubes. Such a standard tube rolling mill is capable of producing tubes with a Figures 1a and 1b shows a standard tube rolling mill for production length of up to 12 meters. id="p-21" id="p-21" id="p-21" id="p-21" id="p-21" id="p-21" id="p-21" id="p-21" id="p-21"
[0021] mill shown: a roll of metal sheets, so called strips 1, rolling mill stations 2, and 3 From left to right are the following components in the tube rolling which in sequences shapes the sheet to a tube, a laser welding station 5, that welds the tube together along a longitudinal weld, a straightening station that straightens the tube after the welding, a heating station that heats the tube at a temperature at i.e. 860 °C, so that the material becomes homogenous, straightening stations 8, 9 that straightens the tube after heating, and sequentially a cutting station 10 that cuts the tube at a predetermined length. After the cutting station the tube is transported out to a ro||ing path 11. When the tube is transported on the ro||ing path it will be transported in a sideway manner, in such a manner that more tube lengths can fit next to each other. [oozz] as described above, which is a conventional and well known way of producing ln a specific embodiment the invention comprise a tube ro||ing mill seam welded tube lengths of stain|ess steel from tubing. The tubes are intended for use in heating spirals in a hot water tank, similar to a boiler for heating up water for domestic use or water for heating up buildings. id="p-23" id="p-23" id="p-23" id="p-23" id="p-23" id="p-23" id="p-23" id="p-23" id="p-23"
[0023] ro||ing path 11, that is extended with an additional ro||ing path 11b, as shown in The tube lengths are transported from the tube ro||ing will to a figures 1c and 1d. This combined ro||ing path 11, 11b is capable of to receive a continuous tube length up to 60 meters. The cutting station 10, that is arranged in connection to the ro||ing path 11, 11b, can cut the tube lengths at selectable lengths between 3 and 60 meters. id="p-24" id="p-24" id="p-24" id="p-24" id="p-24" id="p-24" id="p-24" id="p-24" id="p-24"
[0024] manner to a tubing collector 12b.
After the cutting the cut tubes 2 are transported in a sideways id="p-25" id="p-25" id="p-25" id="p-25" id="p-25" id="p-25" id="p-25" id="p-25" id="p-25"
[0025] or more overhead cranes 21, 22, 23 to a tubing storage. Each overhead crane From the tubing collector 12b the tubes 2 are transported by one 21, 22, 23 is moveable on a rail (not shown) which extends transversely in relation to tubing collector"s 12b longitudinal direction. The rails are moveable in the tube"s longitudinal direction. From each overhead crane 21, 22, 23 is a lifting yoke 24, 25, 26. The lifting yoke is attached to a hook that is connected to a winch (not shown) on the overhead crane 21, 22, 23. The hook can preferably be moved above a height of 7 meters. The hook is attached in the middle of the lifting yoke 24, 25, 26, in such a manner that the lifting yoke is in balance and is kept horizontally. An array of hooks is attached beneath the lifting yoke to fasten straps which can be led around one or several tubes 27. The distance between the hooks can be e.g., 5 meters. [ooze] jointly with a joint control in order to move in a synchronous manner.
The overhead cranes 21, 22, 23 can be controlled individually or [oo27] that is suitable for lifting by the overhead cranes 21, 22, 23, the overhead When the tubing collector 12b have received a number of tubes cranes are positioned above the tubes 27. Here one can use one, two or several overhead cranes depending on the length of the tubes 27. By moving the rails in the tube"s 27 longitudinal direction the positioning of the yokes can be adapted in such a way that they are centered above the tubes 27. ln this way the load is balanced when it is lifted. The yoke or yokes 24, 25, 26 are lowered towards the tubes 27, and the straps are led around the tubes 27. Aften/vards the tubes are lifted hanging in the yokes 24, 25, 26. With a distance of 4 meters in between the straps, the bundle of tubes will not bend in any significant manner during the lift. The tubes can have a wall thickness as little 0.8 millimeters. lt is therefore essential to a certain extent to avoid bending of the tubes during lifting. [oozs] tube's 27 longitudinal direction and the winch transversely positioned in the The bundle of tubes 27 are transported by moving the rails in the tube's longitudinal direction to a tubing storage (not shown). ln the tubing storage the tubes 27 are sorted by length, so that tubes of same length are placed together. id="p-29" id="p-29" id="p-29" id="p-29" id="p-29" id="p-29" id="p-29" id="p-29" id="p-29"
[0029] tubing spirals for spiral heat exchangers. The tube first receives a heat From the tubing storage tubes are retrieved for the production of treatment to remove or reduce stress that occurred during the milling and the seam welding. id="p-30" id="p-30" id="p-30" id="p-30" id="p-30" id="p-30" id="p-30" id="p-30" id="p-30"
[0030] at each end of the tube. These are welded to tube"s straight end. The welding of The spiral heat exchangers are produced mounting a connection the end connection happens after coiling and subsequent cutting are completed. A completed spiral can e.g., have a length of 28 meters. At the ends, wherein the couplings are attached, the tube has straight section. After the coiling the tube undergoes a controlled cooling. id="p-31" id="p-31" id="p-31" id="p-31" id="p-31" id="p-31" id="p-31" id="p-31" id="p-31"
[0031] intended for producing a spiral heat exchanger can therefore vary depending on Such spiral can have different dimensions and tube lengths the type of spiral. When one knows which spiral heat exchanger that shall be produced, one can select a tube of a suitable length and according to the number of heat exchangers of the similar type to be produced. lf, in a specific use case shall produce only one spiral heat exchanger, one intentionally selects the tube in the tubing storage that has a length that is at least as large as one need to produce the spiral. lf one shall produce several spirals, one can select a longer tube that has a length that is at least similar to the sum of the length of several of such spirals, but with the least amount of excessive length. The tube length are cut prior the installation of the end couplings. The cutting happed preferably in the coiling machine straight after the tube has been coiled to a spiral. id="p-32" id="p-32" id="p-32" id="p-32" id="p-32" id="p-32" id="p-32" id="p-32" id="p-32"
[0032] lengths without being forced to weld tubes together in order to achieve sufficient ln this way one can produce spiral heat exchangers of various length. This can also be done with a minimum of cuts. When the tubes are coiled to spirals, they can be transported to a point of destination. The spirals have a length that can without a problem fit in a standard container.

Claims (1)

Claims
1.A method for producing spiral heat exchangers of various lengths, characterized in that tube elements (1) are profile rolled and weided to seam weided tube lengths (21) of stainless steel, the tube lengths (27) are conveyed from the tube rolling mill (2-9) to a rolling path (11, 11b), that each tube length is cut (10) to a predetermined length and is displaced in a sideways manner to a tubing collector (12b), that a collection of tube lengths (27) with equal length are lifted with the assistance of at least an overhead crane (21, 22, 23) with a lifting yoke (24, 25, 26) and is transported to a tubing storage, wherein tubing of various lengths are stored separately from each other, that a tube length is collected out of the tubing storage, that the tube length is coiled to a helical spiral and any excess length is cut, wherein the tube length is selected on the condition that it has the shortest excess length in comparison to the length of the spiral, or the sum of the length of a number of spirals, to be produced from the tube length. _ l\/lethod according to claim 1, characterized in that the rolling path has a length of at least 60 meters. l\/lethod according to claim 1 or 2, characterized in that two or more overhead cranes with respective lifting yokes are arranged to cooperate in lifting and displacing bundles of tubing that have a length beyond the length that can be lifted with a single overhead crane. l\/lethod according to any of the previous claims, characterized in that the lifting yoke is equipped with hooks and lifting straps with a maximum distance from each other of 4 meters. l\/lethod according to any of the previous claims, characterized in that the tube length undergoes a heat treatment for removing or reducing internal stress prior coiling. l\/lethod according to any of the previous claims, characterized in that after the coiling of the tubing end couplings are mounted to the tubing.
SE2350875A 2021-01-08 2022-01-06 Method for producing spiral heat exchangers of various lengths SE2350875A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20210047 2021-01-08
PCT/NO2022/050002 WO2022149984A1 (en) 2021-01-08 2022-01-06 Method for producing spiral heat exchangers of various lengths

Publications (1)

Publication Number Publication Date
SE2350875A1 true SE2350875A1 (en) 2023-07-07

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SE (1) SE2350875A1 (en)
WO (1) WO2022149984A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9284161B2 (en) * 2014-04-29 2016-03-15 National Oilwell Varco, L.P. Self-balancing spreader beam
WO2016197226A1 (en) * 2015-06-09 2016-12-15 Groupe Fimiro Inc. Method and apparatus for preforming a tube and for the manufacturing of coil-on-tube heat-exchangers therefrom
WO2018092492A1 (en) * 2016-11-15 2018-05-24 新日鐵住金株式会社 Operation monitoring device, method and program for high-frequency resistance welding and induction heated welding of electric resistance welded steel pipe
CN107377666A (en) * 2017-04-21 2017-11-24 苏州贝思特金属制品有限公司 A kind of manufacture method of super austenitic 904L stainless-steel seamless pipe coil pipes
CN111922115B (en) * 2020-07-23 2022-04-08 临海市金源工艺品有限公司 Aluminum pipe drawing production line

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WO2022149984A1 (en) 2022-07-14

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