CA2252383C - Process for manufacturing individual pipe sections of a pipe system, and pipe system manufactured in said manner - Google Patents
Process for manufacturing individual pipe sections of a pipe system, and pipe system manufactured in said manner Download PDFInfo
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- CA2252383C CA2252383C CA002252383A CA2252383A CA2252383C CA 2252383 C CA2252383 C CA 2252383C CA 002252383 A CA002252383 A CA 002252383A CA 2252383 A CA2252383 A CA 2252383A CA 2252383 C CA2252383 C CA 2252383C
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- pipe
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Abstract
The invention relates to a process for manufacturing individual pipe sections of a pipe system comprising a product pipe (1) and at least one duct (5) accompanying the product pipe (1), said product pipe (1) and said duct (5) being provided with an insulation (3) surrounded by a jacket pipe (2). The following procedural steps are proposed to produce practically any duct layout along the product pipe (1) in a simple and economical manner: (a) arrangement of at least one core (7) having at least the external contour of the duct (5) in such a manner on the outer surface of the product pipe (1) that the duct (5) formed by the core (7) is open with respect to the product pipe (1) at least in a linear manner along the length of the duct (5); (b) insertion of the unit comprising the product pipe (1) and the core (7) into the jacket pipe (2); filling of the free duct cross-section of the jacket pipe (2) with insulating material which can only flow when in the processing state.
Description
r , ~y .,.e~, j . ., '~--- . .. .. . :: L~~-i ~ v ~'~3 A METHOD FOR THE MANUFACTURE OF INDIVIDUAL
PIPE SECTIONS OF A PIPE AS WELL AS A PIPE
MANUFACTURED IN THAT MANNER
The invention concerns a method for the manufacture of individual pipe sections of a pipe formed by a product pipe and of at least one channel running along the product pipe, particularly a heat channel, in which case the product pipe and the channel are being provided with an insulation enclosed l0 with a jacket pipe. Furthermore, the invention concerns a pipe manufactured in that manner.
Practical applications often require the pipes to be heated, because the products to be transported within the product pipe exhibit an appropriate flowability only at a certain temperature. The heating of the pipes is generally achieved with an accompanying heating system consisting of a heat pipe attached to the product pipe used to transport the product. DE-PS 43 14 761, for example, describes a method for the manufacture of individual pipe sections of a pig pipe, in 20 which the product pipe is fitted with an additional heating pipe, through which the heating of the product to be transported in the product pipe is achieved with steam piped at a high pressure as the heating medium.
Practical applications have shown, however, that the heat transfer between the heating and product pipe is in many cases insufficient due to the linear contact area between the two pipes and due to the fact that steam cannot be used as the heating medium for safety reasons, when the product to be transported in the product pipe should never come into contact with water. Furthermore, the known form for the heating channels is disadvantageous for pipes that are not straight, because the fitting of an additional heating pipe to the product pipe is difficult to achieve from a manufacturing point of view, particularly at sharp bends.
The task of the invention consists in the improving of a method for the manufacture of individual pipe sections of a pipe in such a manner that one achieves a good heat transfer to the product pipe and that any channel form can be run along the product pipe in a cost-effective manner.
This task is solved with a method of the abovementioned type that includes the following process steps: a) at least one core exhibiting at least the outside contour of the channel is arranged on the jacket surface of the product pipe in such a manner that the channel formed by the core is open along the channel length toward the product pipe at least in a linear manner, b) the unit formed by the product pipe and core is inserted into the jacket pipe and c) the free channel section of the jacket pipe is filled with an insulating mass which can only flow in the processing condition.
Accordingly, in one aspect of the invention, there is provided a method for the manufacture of individual pipe sections comprising a product pipe having a jacket surface and at least one channel running along the product pipe, the method comprising the steps of: a) arranging at least one core exhibiting an outside contour of the at least one channel on said jacket surface of said product pipe in such a manner that said at least one channel formed by said at least one core is open along the length said at least one
PIPE SECTIONS OF A PIPE AS WELL AS A PIPE
MANUFACTURED IN THAT MANNER
The invention concerns a method for the manufacture of individual pipe sections of a pipe formed by a product pipe and of at least one channel running along the product pipe, particularly a heat channel, in which case the product pipe and the channel are being provided with an insulation enclosed l0 with a jacket pipe. Furthermore, the invention concerns a pipe manufactured in that manner.
Practical applications often require the pipes to be heated, because the products to be transported within the product pipe exhibit an appropriate flowability only at a certain temperature. The heating of the pipes is generally achieved with an accompanying heating system consisting of a heat pipe attached to the product pipe used to transport the product. DE-PS 43 14 761, for example, describes a method for the manufacture of individual pipe sections of a pig pipe, in 20 which the product pipe is fitted with an additional heating pipe, through which the heating of the product to be transported in the product pipe is achieved with steam piped at a high pressure as the heating medium.
Practical applications have shown, however, that the heat transfer between the heating and product pipe is in many cases insufficient due to the linear contact area between the two pipes and due to the fact that steam cannot be used as the heating medium for safety reasons, when the product to be transported in the product pipe should never come into contact with water. Furthermore, the known form for the heating channels is disadvantageous for pipes that are not straight, because the fitting of an additional heating pipe to the product pipe is difficult to achieve from a manufacturing point of view, particularly at sharp bends.
The task of the invention consists in the improving of a method for the manufacture of individual pipe sections of a pipe in such a manner that one achieves a good heat transfer to the product pipe and that any channel form can be run along the product pipe in a cost-effective manner.
This task is solved with a method of the abovementioned type that includes the following process steps: a) at least one core exhibiting at least the outside contour of the channel is arranged on the jacket surface of the product pipe in such a manner that the channel formed by the core is open along the channel length toward the product pipe at least in a linear manner, b) the unit formed by the product pipe and core is inserted into the jacket pipe and c) the free channel section of the jacket pipe is filled with an insulating mass which can only flow in the processing condition.
Accordingly, in one aspect of the invention, there is provided a method for the manufacture of individual pipe sections comprising a product pipe having a jacket surface and at least one channel running along the product pipe, the method comprising the steps of: a) arranging at least one core exhibiting an outside contour of the at least one channel on said jacket surface of said product pipe in such a manner that said at least one channel formed by said at least one core is open along the length said at least one
2 channel toward the product pipe in linear manner; b) inserting a unit formed by the product pipe and the at least one core into a jacket pipe; and c) filling a free channel cross-section of the jacket pipe with an insulating mass that exhibits a flowability only during processing.
Such a method allows the manufacture of any channel type along the jacket surface of a product pipe, i.e., a channel that is open facing the product line.
Accordingly, it is easy to pull an electric heat 2a conductor through the channel arranged in that manner. It is also possible to run heating gas through this channel. In addition to utilizing the channel as a heating channel, it is also possible to use it for receiving a detector cable or as a so-called "sniffing pipe" to determine leaks in the product pipe.
It was proven particularly advantageous to manufacture the channel by pulling the core out of the jacket pipe after the insulation mass has hardened. In addition to yielding a l0 simple channel manufacture, said method also allows a reuse of the core retrieved in that manner. Pulling the core out of the hardened insulation mass produces a channel that runs along the jacket area of a product pipe and that is open toward the jacket area of the product pipe, thus ensuring a good heat transfer between heating channel and product pipe.
According to a preferred design form of the invention, the material used for the core consists of an elastic material, whose cross-section changes with the application of a tensile force. Silicone rubber is such a 20 material, for example. After the insulation mass has hardened, such an elastic material is particularly easy to pull out of the pipe section. When applying a tensile force, the outer surface of this elastic core material separates from the hardened insulation mass due to the decreased cross-section and pulling the core out of the channel formed by it requires very little effort indeed.
A further design formed in accordance with the invention proposes that the core material consists of a
Such a method allows the manufacture of any channel type along the jacket surface of a product pipe, i.e., a channel that is open facing the product line.
Accordingly, it is easy to pull an electric heat 2a conductor through the channel arranged in that manner. It is also possible to run heating gas through this channel. In addition to utilizing the channel as a heating channel, it is also possible to use it for receiving a detector cable or as a so-called "sniffing pipe" to determine leaks in the product pipe.
It was proven particularly advantageous to manufacture the channel by pulling the core out of the jacket pipe after the insulation mass has hardened. In addition to yielding a l0 simple channel manufacture, said method also allows a reuse of the core retrieved in that manner. Pulling the core out of the hardened insulation mass produces a channel that runs along the jacket area of a product pipe and that is open toward the jacket area of the product pipe, thus ensuring a good heat transfer between heating channel and product pipe.
According to a preferred design form of the invention, the material used for the core consists of an elastic material, whose cross-section changes with the application of a tensile force. Silicone rubber is such a 20 material, for example. After the insulation mass has hardened, such an elastic material is particularly easy to pull out of the pipe section. When applying a tensile force, the outer surface of this elastic core material separates from the hardened insulation mass due to the decreased cross-section and pulling the core out of the channel formed by it requires very little effort indeed.
A further design formed in accordance with the invention proposes that the core material consists of a
3 material that is elastic and expands under pressure. For example, such a core can be formed with a hose that maintains its shape by way of a hydraulic or pneumatic pressure until the insulation mass has hardened. The hose will collapse after lowering the pressure and can be pulled out of the jacket pipe.
A further design form in accordance with the invention proposes that the core consists of a nonelastic material, to which is applied a separating agent on the outside surface facing the insulation mass and prior to pushing it into the jacket pipe. A core made of a nonelastic material can only be used for generally straight pipe sections, since pulling the core out of the hardened insulation mass would otherwise require much effort. In that respect, the separating agent applied to the outside core surface should reduce the frictional forces between the hardened insulation mass and core. Applying a separating agent has also proven beneficial for a core made of an elastic material.
According to an alternative design form of the method in accordance with the invention, the channel that is open toward the product line is produced using a hollow profile that is arranged on the product pipe with its open side facing it and remains in the jacket pipe after the insulation mass has hardened.
To improve the heat transfer between channel and product pipe and to make the pulling-out of the core from the hardened insulation mass easier, a further design form of the
A further design form in accordance with the invention proposes that the core consists of a nonelastic material, to which is applied a separating agent on the outside surface facing the insulation mass and prior to pushing it into the jacket pipe. A core made of a nonelastic material can only be used for generally straight pipe sections, since pulling the core out of the hardened insulation mass would otherwise require much effort. In that respect, the separating agent applied to the outside core surface should reduce the frictional forces between the hardened insulation mass and core. Applying a separating agent has also proven beneficial for a core made of an elastic material.
According to an alternative design form of the method in accordance with the invention, the channel that is open toward the product line is produced using a hollow profile that is arranged on the product pipe with its open side facing it and remains in the jacket pipe after the insulation mass has hardened.
To improve the heat transfer between channel and product pipe and to make the pulling-out of the core from the hardened insulation mass easier, a further design form of the
4 invention proposes that a thin coating that preferably promotes the heat transfer be applied to the core surface facing the insulation mass as well as to the jacket pipe of the product pipe touching the core, i.e., prior to pushing it into the jacket pipe.
According to a preferred design form of the invention, this thin coating that preferably promotes the heat transfer is applied to the core surface facing the insulation mass as well as to the whole free jacket surface of the product pipe. In that manner, it is possible to achieve a heat transfer from the channel to the whole jacket surface of the product pipe that is not directly heated. In addition to improving the heat transfer, the use of a thin coating that is applied over the whole jacket surface of the product pipe simplifies a possible recycling of a pipe manufactured in that manner, since the insulation material as well as the product pipe remain almost completely separated.
Metal foils and particularly aluminum foil represent particularly suitable materials.
To prevent this thin coating from being pulled out when pulling the core out of the pipe section, a bonding agent can be applied to the thin coating surface facing the insulation material.
A further development of this method provides for the arranging of a spring-elastic element made of an elastic material such as foam on the core surface facing the insulation mass. When using an electric heat conductor to be introduced in the channel, this elastic element functions as
According to a preferred design form of the invention, this thin coating that preferably promotes the heat transfer is applied to the core surface facing the insulation mass as well as to the whole free jacket surface of the product pipe. In that manner, it is possible to achieve a heat transfer from the channel to the whole jacket surface of the product pipe that is not directly heated. In addition to improving the heat transfer, the use of a thin coating that is applied over the whole jacket surface of the product pipe simplifies a possible recycling of a pipe manufactured in that manner, since the insulation material as well as the product pipe remain almost completely separated.
Metal foils and particularly aluminum foil represent particularly suitable materials.
To prevent this thin coating from being pulled out when pulling the core out of the pipe section, a bonding agent can be applied to the thin coating surface facing the insulation material.
A further development of this method provides for the arranging of a spring-elastic element made of an elastic material such as foam on the core surface facing the insulation mass. When using an electric heat conductor to be introduced in the channel, this elastic element functions as
5 some type of a spring element and the heat conductor is thus pressed against the jacket surface of the product pipe. This spring effect is produced as follows: the elastic element is initially compressed by the filling with and hardening of the insulation mass and will again expand to achieve its original form after the core has been pulled out. When additionally using the thin coating that promotes the heat transfer, the spring-elastic element can be arranged on and/or below this thin coating. When using hollow profiles that remain in the jacket pipe, the spring-elastic element can be arranged on the hollow profile's inside surface facing the channel.
The method in accordance with the invention can be developed further by fitting the product pipe and core with a spacer prior to inserting them in the jacket pipe, thus ensuring that they occupy a defined position within the jacket pipe.
Finally, a further development of the method proposes the use of an insulation mass that increases its volume during the hardening process, i.e., particularly polyurethane foam. Polyurethane foam presents the advantage that it exhibits a low heat conductivity and a certain compressive strength.
Further details and features of the invention are given in the following description in combination with the respective drawing. The drawings show the following:
Figure 1 shows a cross-section of a pipe section fitted with a rectangular channel;
The method in accordance with the invention can be developed further by fitting the product pipe and core with a spacer prior to inserting them in the jacket pipe, thus ensuring that they occupy a defined position within the jacket pipe.
Finally, a further development of the method proposes the use of an insulation mass that increases its volume during the hardening process, i.e., particularly polyurethane foam. Polyurethane foam presents the advantage that it exhibits a low heat conductivity and a certain compressive strength.
Further details and features of the invention are given in the following description in combination with the respective drawing. The drawings show the following:
Figure 1 shows a cross-section of a pipe section fitted with a rectangular channel;
6 Figure 2 shows a cross-section as in Figure 1, but with three U-shaped channels;
Figure 3 shows a combined pipe consisting of two pipe sections.
The pipe sections shown in Figures 1 and 2 in the form of a cross-section basically consist of inside product pipe 1 as well as of insulation 3 enclosed by jacket pipe 2.
To maintain product pipe 1 in a predetermined position in jacket pipe 2, product pipe 1 is fitted with spacers 4 exhibiting radially arranged webs to ensure a uniform and preferably coaxial position of product pipe 1 within jacket pipe 2.
Channel 5 that is open at least toward product pipe 1 is provided on the jacket surface of product pipe 1 to receive an electrical heat conductor in particular. In the design form shown in Figure 1, rectangular channel 5 is arranged on the bottom side of product pipe 1, while the design form shown in Figure 2 shows three U-shaped channels 5 arranged at a spacing on the bottom side of product pipe 1.
To increase the heat transfer between the heat conductor and product pipe 1 and to achieve a separation between product pipe 1 and insulation mass 3 for a possible recycling at a later date, thin layer 6 consisting of a material that preferably promotes the heat transfer is applied at least to the jacket surface of product pipe 1 touching channel 5 as well as to the outside surface of channels 5 or channel 5. Aluminum foil is a particularly suitable material
Figure 3 shows a combined pipe consisting of two pipe sections.
The pipe sections shown in Figures 1 and 2 in the form of a cross-section basically consist of inside product pipe 1 as well as of insulation 3 enclosed by jacket pipe 2.
To maintain product pipe 1 in a predetermined position in jacket pipe 2, product pipe 1 is fitted with spacers 4 exhibiting radially arranged webs to ensure a uniform and preferably coaxial position of product pipe 1 within jacket pipe 2.
Channel 5 that is open at least toward product pipe 1 is provided on the jacket surface of product pipe 1 to receive an electrical heat conductor in particular. In the design form shown in Figure 1, rectangular channel 5 is arranged on the bottom side of product pipe 1, while the design form shown in Figure 2 shows three U-shaped channels 5 arranged at a spacing on the bottom side of product pipe 1.
To increase the heat transfer between the heat conductor and product pipe 1 and to achieve a separation between product pipe 1 and insulation mass 3 for a possible recycling at a later date, thin layer 6 consisting of a material that preferably promotes the heat transfer is applied at least to the jacket surface of product pipe 1 touching channel 5 as well as to the outside surface of channels 5 or channel 5. Aluminum foil is a particularly suitable material
7 for thin layer 6. In the design form shown in Figure 2, thin layer 6 extends across the whole free jacket surface of product pipe 1.
The manufacture of a pipe section exhibiting one or more channels 5 on the jacket surface of product pipe 1 is achieved as indicated below:
In a first process step, core 7 exhibiting the outside contour of channel 5 is arranged on the jacket surface of product pipe 1. To obtain the pipe cross-sections shown in Figures 1 and 2, thin layer 6 consisting of an aluminum foil is subsequently placed on the free jacket surface of product pipe 1 as well as on the outside surface of core 7 or cores 7.
Spacers 4 are subsequently arranged at a spacing on product pipe 1 and the unit formed by core 7 and product pipe 1 is inserted in jacket pipe 2.
In addition to using a thin-walled pipe as jacket pipe 2, a jacket pipe 2 manufactured by way of a spiral-like coiling and folding of a stretched sheet metal band was proven to be very suitable.
After inserting the unit formed by core 7 and product pipe 1 in jacket pipe 2, the free cross-section of jacket pipe 2 is closed and the free channel cross-section of jacket pipe is subsequently filled with an insulation mass exhibiting a flowability in the processing condition to form insulation 3. Because it exhibits only a low heat conductivity and hardens under pressure, polyurethane foam is considered a particularly suitable insulation mass.
To form channel 5 that is open toward product pipe
The manufacture of a pipe section exhibiting one or more channels 5 on the jacket surface of product pipe 1 is achieved as indicated below:
In a first process step, core 7 exhibiting the outside contour of channel 5 is arranged on the jacket surface of product pipe 1. To obtain the pipe cross-sections shown in Figures 1 and 2, thin layer 6 consisting of an aluminum foil is subsequently placed on the free jacket surface of product pipe 1 as well as on the outside surface of core 7 or cores 7.
Spacers 4 are subsequently arranged at a spacing on product pipe 1 and the unit formed by core 7 and product pipe 1 is inserted in jacket pipe 2.
In addition to using a thin-walled pipe as jacket pipe 2, a jacket pipe 2 manufactured by way of a spiral-like coiling and folding of a stretched sheet metal band was proven to be very suitable.
After inserting the unit formed by core 7 and product pipe 1 in jacket pipe 2, the free cross-section of jacket pipe 2 is closed and the free channel cross-section of jacket pipe is subsequently filled with an insulation mass exhibiting a flowability in the processing condition to form insulation 3. Because it exhibits only a low heat conductivity and hardens under pressure, polyurethane foam is considered a particularly suitable insulation mass.
To form channel 5 that is open toward product pipe
8 1, core 7 is pulled out of the hardened insulation mass after the insulation mass has hardened. In addition to the simple and cost-effective manufacture of channel 5 that is open toward product pipe 1, this manufacturing method is characterized by the fact that an almost indefinite number of channel runs are possible along the pipe length and a good heat transfer to product pipe 1 is ensured due to the fact that channel 5 is open toward product pipe 1. In addition to being utilized as a heating channel, channel 5 can also be l0 used to receive a detector cable or as a so-called "sniffing pipe" to discover leaks in product pipe 1. In the design form shown in Figure 2 with three channels 5 arranged on the jacket surface of product pipe 1, each channel 5 can possibly be used for a different purpose.
The connecting of pipe sections produced with this method occurs on site as shown in Figure 3 in a schematic representation. After a welded connection has been achieved between product pipes 1 projecting beyond jacket pipe 2 as well as beyond insulation 3 and channel 5 at the connection 20 point, channel element 8 is inserted in channels 5 of the piping sections to be connected to increase the length of channel 5 beyond the connection point. Product pipe 1 and channel 5 are subsequently insulated in a suitable manner and collar 9 is pushed onto the connection point, thus connecting jacket pipes 2.
It may not be necessary to insert channel element 8 at the connection point when channels 5 of the pipe sections are used to receive a heat conductor and when an appropriate
The connecting of pipe sections produced with this method occurs on site as shown in Figure 3 in a schematic representation. After a welded connection has been achieved between product pipes 1 projecting beyond jacket pipe 2 as well as beyond insulation 3 and channel 5 at the connection 20 point, channel element 8 is inserted in channels 5 of the piping sections to be connected to increase the length of channel 5 beyond the connection point. Product pipe 1 and channel 5 are subsequently insulated in a suitable manner and collar 9 is pushed onto the connection point, thus connecting jacket pipes 2.
It may not be necessary to insert channel element 8 at the connection point when channels 5 of the pipe sections are used to receive a heat conductor and when an appropriate
9 insulation is ensured at this connection point.
When channel 5 is used to receive an electric heat conductor, it is advantageous to make the cross-section of the channel several times larger than that of the heat conductor, since this provides the best utilization of the heat convection. Furthermore, this effect is reinforced by rounding the channel corners.
List of reference symbols 1. Product pipe 2. Jacket pipe 3. Insulation 4. Spacer 5. Channel 6. Thin layer 7. Core 8. Channel element 9. Collar
When channel 5 is used to receive an electric heat conductor, it is advantageous to make the cross-section of the channel several times larger than that of the heat conductor, since this provides the best utilization of the heat convection. Furthermore, this effect is reinforced by rounding the channel corners.
List of reference symbols 1. Product pipe 2. Jacket pipe 3. Insulation 4. Spacer 5. Channel 6. Thin layer 7. Core 8. Channel element 9. Collar
Claims (21)
1. A method for the manufacture of individual pipe sections comprising a product pipe having a jacket surface and at least one channel running along the product pipe, the method comprising the steps of:
a) arranging at least one core exhibiting an outside contour of the at least one channel on said jacket surface of said product pipe in such a manner that said at least one channel formed by said at least one core is open along the length of said at least one channel toward the product pipe in linear manner;
b) inserting a unit formed by the product pipe and the at least one core into a jacket pipe; and c) filling a free channel cross-section of the jacket pipe with an insulating mass that exhibits a flowability only during processing.
a) arranging at least one core exhibiting an outside contour of the at least one channel on said jacket surface of said product pipe in such a manner that said at least one channel formed by said at least one core is open along the length of said at least one channel toward the product pipe in linear manner;
b) inserting a unit formed by the product pipe and the at least one core into a jacket pipe; and c) filling a free channel cross-section of the jacket pipe with an insulating mass that exhibits a flowability only during processing.
2. A method in accordance with claim 1 further comprising pulling the at least one core out of the jacket pipe after the insulation mass has hardened.
3. A method in accordance with claim 2 wherein said at least one core consists of an elastic material, whose cross-section decreases when a tensile load is applied.
4. A method in accordance with claim 2 wherein said at least one core consists of a material that is elastic and expands under pressure.
5. A method in accordance with claim 3 wherein the elastic material consists of a silicone rubber.
6. A method in accordance with claim 2 wherein said at least one core consists of a nonelastic material, on which prior to the insertion into the jacket pipe a separating agent is applied on an outside surface facing the insulation.
7. A method in accordance with claim 1 wherein said at least one core consists of a hollow profile that remains in the jacket pipe and is open toward the product pipe.
8. A method in accordance with claim 1 wherein prior to the insertion into the jacket pipe a thin layer that promotes heat transfer is applied to a surface of said at least one core facing the insulation mass as well as to the jacket surface of the product pipe touching the at least one core.
9. A method in accordance with claim 1 wherein prior to the insertion into the jacket pipe a thin layer that promotes heat transfer is applied to a surface of said at least one core facing the insulation mass as well as to the whole free jacket surface of the product pipe.
10. A method in accordance with claim 8 or 9 wherein the thin layer consists of a foil.
11. A method in accordance with claim 8 wherein the thin layer consists of a metal foil.
12. A method in accordance with claim 8 wherein the thin layer consists of an aluminum foil.
13. A method in accordance with claim 8 wherein a bonding agent is applied to the surface of the thin layer facing the insulation mass.
14. A method in accordance with claim 2 wherein an element consisting of a spring-elastic material is arranged on a surface of said at least one core facing the insulation mass.
15. A method in accordance with claim 14 wherein the spring-elastic material is foam.
16. A method in accordance with claim 8 or 9 wherein an element consisting of a spring-elastic material is arranged on a surface of said at least one core facing the insulation mass and the spring-elastic material is arranged on and below the thin layer.
17. A method in accordance with claim 14 wherein the spring-elastic material is arranged inside a hollow profile facing the channel.
18. A method in accordance with claim 1 wherein the at least one channel is arranged at a bottom side of the product pipe.
19. A method in accordance with claim 1 further comprising, prior to inserting the unit into the jacket pipe, fitting the unit with spacers, thus ensuring a defined position in the jacket pipe.
20. A method in accordance with claim 1 wherein the insulation mass hardens while increasing its volume.
21. A method in accordance with claim 1 wherein the insulation mass comprises a polyurethane foam that hardens while increasing its volume.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19618370A DE19618370C1 (en) | 1996-05-09 | 1996-05-09 | Method manufacturing pipe section for heat-insulated pipe conduit |
| DE19618370.7 | 1996-05-09 | ||
| PCT/EP1997/002312 WO1997043576A1 (en) | 1996-05-09 | 1997-05-07 | Process for manufacturing individual pipe sections of a pipe system, and pipe system manufactured in said manner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2252383A1 CA2252383A1 (en) | 1997-11-20 |
| CA2252383C true CA2252383C (en) | 2005-11-01 |
Family
ID=35431070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002252383A Expired - Fee Related CA2252383C (en) | 1996-05-09 | 1997-05-07 | Process for manufacturing individual pipe sections of a pipe system, and pipe system manufactured in said manner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2252383C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981251B (en) * | 2020-08-25 | 2021-11-16 | 六安中财管道科技有限公司 | Heat-preservation integrated solar special pipe and processing technology |
-
1997
- 1997-05-07 CA CA002252383A patent/CA2252383C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2252383A1 (en) | 1997-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130507 |