CA2443421C - Double-skinned tube for the fluid transport of abrasive solids - Google Patents
Double-skinned tube for the fluid transport of abrasive solids Download PDFInfo
- Publication number
- CA2443421C CA2443421C CA002443421A CA2443421A CA2443421C CA 2443421 C CA2443421 C CA 2443421C CA 002443421 A CA002443421 A CA 002443421A CA 2443421 A CA2443421 A CA 2443421A CA 2443421 C CA2443421 C CA 2443421C
- Authority
- CA
- Canada
- Prior art keywords
- tube
- double
- skinned
- inner tube
- outer tube
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The double-skinned tube for the fluid transport of abrasive solids, in particular, of concrete, comprises a hardened inner tube (2), an outer tube (3), made from a steel which can be welded, terminal coupling collars (4), made from a steel which can be welded and a thermal insulation layer (7) between the inner tube (2) and the outer tube (3). The thermal insulation layer (7) can be formed by a coating of a combustible, non-metallic material, such as for example a rust-proofing agent, applied to the external surface (11) of the inner tube (2) and/or the internal surface of the external tube (3).
Description
.y . ' Double-Skinned Tube for the Fluid Transport of Abrasive Solids The invention relates to a double-skinned tube for the fluid transport of -abrasive solids, in particular, of concrete.
A double-skinned tube of this type comprises a hardened inner tube so as to counteract the solid matter to be transported with as long a wear resistance as possible. The thickness of the hardness layer proceeding from the inner surface essentially depends on the site where a double-skinned tube is to be used.
With comparatively thin-walled double-skinned tubes as they are primarily used for transporting concrete, the approximately 2 mm thick wall is usually completely hardened.
The inner tube is encased by an outer tube which is impact resistant and thus also weldable. The impact resistance is particularly important with respect to the transport of a double-skinned tube from the manufacturing plant to the installation site, since a transport of this type is usually subjected to rough handling.
Coupling collars which are connected with adjacent double-skinned tubes by means of clamping rings or screw bolts with nuts to form a pipeline are fastened in most cases to the ends of a double-skinned tube.
Due to the fact that the tubes to be used for the manufacture of a double-skinned tube have comparatively large manufacturing tolerances, in most cases, the inner tubes only adjoin the outer tubes at certain points. The heat applied to the inner tubes after the inner tubes have been joined with the outer tubes in order to harden them then has clearly better heat-transfer conditions at the contact points in comparison to the areas where _ 2 _ there are air gaps. In other words, the heat flows off outward.
The result of this is that some areas of the inner tube can be brought to the temperature of 830 C required for a hardening process and other areas can not. If the inner tube is then quenched for the hardening, areas of the inner tube are hardened and other areas are not hardened or at least not to a sufficient degree due to an insufficient heating temperature. The wear resistance of a double-skinned tube is therefore not identical in all inner surface areas. Consequently, this results in coarseness e.g. due to overheating, cracks due to increased tensions between differently heated areas and, in particular, also an unpeeling of the inner tube if the concrete to be transported flanges the worn inner tubes inward, so that this would result in plug formations with an interruption of the transport flow.
Proceeding from the prior art, the object of the invention is to create a double-skinned tube in which a uniform heating of the inner tube is assured, seen both over the length and over the periphery, and with which a more uniform hardness of the inner tube can also be obtained.
The thermal insulation layer between the inner tube and the outer tube forms a barrier during heating of the inner tube, said barrier preventing heat from flowing off to a significant extent from the inner tube to the outer tube. Rather, the applied heat remains in the inner tube with the result that the inner tube, in particular with thin tubular walls, can be uniformly heated within a very narrow temperature range. If the inner tube is subsequently quenched, then an extremely uniform hardness is present over the entire periphery and length of an inner tube.
The service life of a double-skinned tube is clearly improved in this manner.
A further advantage of the invention can be seen if the coupling collar provided on the end of a double-skinned tube, no matter what the configuration, is to also always be welded to the outer tube. In particular in thin-walled outer tubes, the welding heat can then no longer act on the inner tube to a still relevant degree via the separating layer between the outer tube and the inner tube and thus counteract the hardness there. Optionally, when welding the coupling collar, in particular in a thin-walled inner tube, it is only necessary to also perform a slight cooling step on the inside.
Thus, in addition to the longer life of a double-skinned tube, the essential advantage of the invention is that, due to the thermal insulating layer, clearly less thermal energy must be applied to obtain the advantageous hardening temperature above the AC3 point and that great cooling energy is also no longer required on the other side to prevent the previously produced hardened layer from being counteracted in an inner tube during welding of the coupling collar.
Accordingly, the thermal insulating layer between the inner tube and the outer tube is formed by a coating consisting of combustible, non-metallic material applied to the outer surface of the inner tube and/or to the inner surface of the outer tube. In practical tests, it was shown to be advantageous if a rust-proofing agent is applied to the outer surface of an inner tube which then combusts due to the thermal effect during hardening and produces a clear separating layer on the periphery of the inner tube.
In accordance with this invention, there is provided a double-skinned tube for the fluid transport of - 3a -abrasive solids, which has a hardened inner tube of steel, an outer tube consisting of a weldable steel, terminal coupling collars consisting of a weldable steel and a thermal insulating layer between the inner tube and the outer tube.
The invention will be described in greater detail in the following with reference to an embodiment shown in the drawing, which is Figure 1.
., = =
_ 4 _ The drawing shows, in a vertical longitudinal section, one half of an end section of a double-skinned tube 1 for the fluid transport of abrasive solids, in particular of concrete.
The double-skinned tube 1 comprises a hardened inner tube 2, an unhardened outer tube 3 as well as coupling collars 4 on the ends for connection with adjacent double-skinned tubes 1. Since only one end of a double-skinned tube 1 is shown, only one coupling collar 4 is also shown. The coupling collar 4 is welded together with the outer surface 6 of the outer tube 3 by means of a fillet weld 5.
A thermal insulating layer 7 is found between the inner tube 2 and the outer tube 3. This layer 7 is formed from a combustible, non-metallic material, such as e.g. a rust-proofing agent, which is applied to the outer surface 11 of the inner tube 2 prior to joining with the outer tube 3..
The inner tube 2 is secured in the outer tube 3 by at least one hardening process.
In the embodiment, the front ends 8-10 of the inner tube 2, of the outer tube 3 and of each coupling collar 4 lie in the same lateral plane QE.
A peripherally extending coupling groove 12 which is trapezoidal in cross section is found in each coupling member 4.
.~ , List of Reference Numbers 1 - Double-skinned tube 2 - Inner tube of 1 3 - Outer tube of 1 4 - Coupling collar of 1 - Fillet weld 6 - Outer surface of 3 7 - Layer between 2 and 3 8 - Front end of 2 9 - Front end of 3 - Front end of 4 11 - Outer surface of 2 12 - Coupling groove in 4 QE - Lateral plane
A double-skinned tube of this type comprises a hardened inner tube so as to counteract the solid matter to be transported with as long a wear resistance as possible. The thickness of the hardness layer proceeding from the inner surface essentially depends on the site where a double-skinned tube is to be used.
With comparatively thin-walled double-skinned tubes as they are primarily used for transporting concrete, the approximately 2 mm thick wall is usually completely hardened.
The inner tube is encased by an outer tube which is impact resistant and thus also weldable. The impact resistance is particularly important with respect to the transport of a double-skinned tube from the manufacturing plant to the installation site, since a transport of this type is usually subjected to rough handling.
Coupling collars which are connected with adjacent double-skinned tubes by means of clamping rings or screw bolts with nuts to form a pipeline are fastened in most cases to the ends of a double-skinned tube.
Due to the fact that the tubes to be used for the manufacture of a double-skinned tube have comparatively large manufacturing tolerances, in most cases, the inner tubes only adjoin the outer tubes at certain points. The heat applied to the inner tubes after the inner tubes have been joined with the outer tubes in order to harden them then has clearly better heat-transfer conditions at the contact points in comparison to the areas where _ 2 _ there are air gaps. In other words, the heat flows off outward.
The result of this is that some areas of the inner tube can be brought to the temperature of 830 C required for a hardening process and other areas can not. If the inner tube is then quenched for the hardening, areas of the inner tube are hardened and other areas are not hardened or at least not to a sufficient degree due to an insufficient heating temperature. The wear resistance of a double-skinned tube is therefore not identical in all inner surface areas. Consequently, this results in coarseness e.g. due to overheating, cracks due to increased tensions between differently heated areas and, in particular, also an unpeeling of the inner tube if the concrete to be transported flanges the worn inner tubes inward, so that this would result in plug formations with an interruption of the transport flow.
Proceeding from the prior art, the object of the invention is to create a double-skinned tube in which a uniform heating of the inner tube is assured, seen both over the length and over the periphery, and with which a more uniform hardness of the inner tube can also be obtained.
The thermal insulation layer between the inner tube and the outer tube forms a barrier during heating of the inner tube, said barrier preventing heat from flowing off to a significant extent from the inner tube to the outer tube. Rather, the applied heat remains in the inner tube with the result that the inner tube, in particular with thin tubular walls, can be uniformly heated within a very narrow temperature range. If the inner tube is subsequently quenched, then an extremely uniform hardness is present over the entire periphery and length of an inner tube.
The service life of a double-skinned tube is clearly improved in this manner.
A further advantage of the invention can be seen if the coupling collar provided on the end of a double-skinned tube, no matter what the configuration, is to also always be welded to the outer tube. In particular in thin-walled outer tubes, the welding heat can then no longer act on the inner tube to a still relevant degree via the separating layer between the outer tube and the inner tube and thus counteract the hardness there. Optionally, when welding the coupling collar, in particular in a thin-walled inner tube, it is only necessary to also perform a slight cooling step on the inside.
Thus, in addition to the longer life of a double-skinned tube, the essential advantage of the invention is that, due to the thermal insulating layer, clearly less thermal energy must be applied to obtain the advantageous hardening temperature above the AC3 point and that great cooling energy is also no longer required on the other side to prevent the previously produced hardened layer from being counteracted in an inner tube during welding of the coupling collar.
Accordingly, the thermal insulating layer between the inner tube and the outer tube is formed by a coating consisting of combustible, non-metallic material applied to the outer surface of the inner tube and/or to the inner surface of the outer tube. In practical tests, it was shown to be advantageous if a rust-proofing agent is applied to the outer surface of an inner tube which then combusts due to the thermal effect during hardening and produces a clear separating layer on the periphery of the inner tube.
In accordance with this invention, there is provided a double-skinned tube for the fluid transport of - 3a -abrasive solids, which has a hardened inner tube of steel, an outer tube consisting of a weldable steel, terminal coupling collars consisting of a weldable steel and a thermal insulating layer between the inner tube and the outer tube.
The invention will be described in greater detail in the following with reference to an embodiment shown in the drawing, which is Figure 1.
., = =
_ 4 _ The drawing shows, in a vertical longitudinal section, one half of an end section of a double-skinned tube 1 for the fluid transport of abrasive solids, in particular of concrete.
The double-skinned tube 1 comprises a hardened inner tube 2, an unhardened outer tube 3 as well as coupling collars 4 on the ends for connection with adjacent double-skinned tubes 1. Since only one end of a double-skinned tube 1 is shown, only one coupling collar 4 is also shown. The coupling collar 4 is welded together with the outer surface 6 of the outer tube 3 by means of a fillet weld 5.
A thermal insulating layer 7 is found between the inner tube 2 and the outer tube 3. This layer 7 is formed from a combustible, non-metallic material, such as e.g. a rust-proofing agent, which is applied to the outer surface 11 of the inner tube 2 prior to joining with the outer tube 3..
The inner tube 2 is secured in the outer tube 3 by at least one hardening process.
In the embodiment, the front ends 8-10 of the inner tube 2, of the outer tube 3 and of each coupling collar 4 lie in the same lateral plane QE.
A peripherally extending coupling groove 12 which is trapezoidal in cross section is found in each coupling member 4.
.~ , List of Reference Numbers 1 - Double-skinned tube 2 - Inner tube of 1 3 - Outer tube of 1 4 - Coupling collar of 1 - Fillet weld 6 - Outer surface of 3 7 - Layer between 2 and 3 8 - Front end of 2 9 - Front end of 3 - Front end of 4 11 - Outer surface of 2 12 - Coupling groove in 4 QE - Lateral plane
Claims (4)
1. Double-skinned tube for the fluid transport of abrasive solids, which has a hardened inner tube of steel (2), an outer tube (3) consisting of a weldable steel, terminal coupling collars (4) consisting of a weldable steel and a thermal insulating layer (7) between the inner tube (2) and the outer tube (3).
2. Double-skinned tube according to claim 1, wherein the thermal insulating layer (7) between the inner tube (2) and the outer tube (3) is formed by a coating of a combustible non-metallic material applied to the outer surface (11) of the inner tube (2) and to the inner surface of the outer tube (3).
3. Double-skinned tube according to claim 1, wherein the thermal insulating layer (7) between the inner tube (2) and the outer tube (3) is formed by a coating of a combustible non-metallic material applied to the outer surface (11) of the inner tube (2) or to the inner surface of the outer tube (3).
4. Double-skinned tube according to any one of claims 1 to 3, wherein the abrasive solids comprise concrete.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10143187.2 | 2001-09-04 | ||
| DE2001143187 DE10143187C1 (en) | 2001-09-04 | 2001-09-04 | Double-layer pipe for the fluid transport of abrasive substances |
| PCT/DE2001/003526 WO2003027564A1 (en) | 2001-09-04 | 2001-09-14 | Double-skinned tube for the fluid transport of abrasive solids |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2443421A1 CA2443421A1 (en) | 2003-04-03 |
| CA2443421C true CA2443421C (en) | 2008-07-22 |
Family
ID=7697590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002443421A Expired - Fee Related CA2443421C (en) | 2001-09-04 | 2001-09-14 | Double-skinned tube for the fluid transport of abrasive solids |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1444460B1 (en) |
| CA (1) | CA2443421C (en) |
| DE (2) | DE10143187C1 (en) |
| ES (1) | ES2468491T3 (en) |
| WO (1) | WO2003027564A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10324321A1 (en) | 2003-05-27 | 2004-12-23 | Putzmeister Ag | Delivery pipe for viscous media, in particular, concrete comprises an inner pipe whose material engages with the annular step of the collar element on the inner pipe |
| EP1653140A1 (en) | 2004-10-28 | 2006-05-03 | Esser-Werke KG | Conveying tube for transporting solid products |
| DE102006007203A1 (en) * | 2006-02-15 | 2007-08-16 | Putzmeister Ag | Composite conveyor tube |
| DE102006041696A1 (en) * | 2006-09-06 | 2008-03-27 | Schneiders, Servatius | Method for producing a concrete delivery pipe |
| FR3054017B1 (en) * | 2016-07-13 | 2018-07-13 | Societe Nouvelle Stim | PROCESSING PROCESS WITHIN TYPE CEMENTATION STEEL PIPES INTENDED FOR THE TRANSPORT OF PULVERULENTS AND OTHER ABRASIVE SOLIDS FOR DELAYING THE PUNCHING OF THE ENVELOPE |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1494638A (en) * | 1967-12-14 | |||
| GB1244938A (en) * | 1969-03-12 | 1971-09-02 | Steel Co Of Wales Ltd | Improvements in and relating to lined pipes and vessels |
| US3735478A (en) * | 1971-01-06 | 1973-05-29 | Foster Co | Methods for making bi-metallic pipe |
| SE7712929L (en) | 1976-11-19 | 1978-05-20 | Minnesota Mining & Mfg | WEAR-RESISTANT PLATE, THEREFORE PRODUCED WEAR COATING AND WAY TO PRODUCE THIS |
| DE2905071C2 (en) * | 1979-02-10 | 1983-11-03 | Jakobs & Co GmbH, 4200 Oberhausen | Double wall conduit |
| DE3034800A1 (en) * | 1980-09-16 | 1982-04-29 | Esser Werke GmbH vorm. Westmontan-Werke, 4788 Warstein | Pneumatic or hydraulic transport pipe - with accurately aligned welded flange and flanged spigot on middle part |
| US4478253A (en) | 1983-04-08 | 1984-10-23 | Krw Energy Systems Inc. | Erosion resistant elbow for solids conveyance |
-
2001
- 2001-09-04 DE DE2001143187 patent/DE10143187C1/en not_active Expired - Lifetime
- 2001-09-14 DE DE10196901T patent/DE10196901D2/en not_active Expired - Fee Related
- 2001-09-14 ES ES01971707.3T patent/ES2468491T3/en not_active Expired - Lifetime
- 2001-09-14 CA CA002443421A patent/CA2443421C/en not_active Expired - Fee Related
- 2001-09-14 EP EP01971707.3A patent/EP1444460B1/en not_active Expired - Lifetime
- 2001-09-14 WO PCT/DE2001/003526 patent/WO2003027564A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| EP1444460A1 (en) | 2004-08-11 |
| CA2443421A1 (en) | 2003-04-03 |
| ES2468491T3 (en) | 2014-06-16 |
| WO2003027564A1 (en) | 2003-04-03 |
| EP1444460B1 (en) | 2014-04-30 |
| DE10143187C1 (en) | 2003-04-17 |
| DE10196901D2 (en) | 2004-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20180914 |