• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Disclosed is a method of coating a tube (210), which method comprises the step of applying a glass fiber reinforced PU laminate around the tube. The glass fiber reinforced PU laminate is applied by the steps of: a) applying liquid PU resin (220) to the outer surface of the tube, for example by spraying, spraying, rolling, brushing or impregnation; b) applying a glass fiber mesh (240) to the wet PU; c) Continuing steps a) and b) through 360 ° and beyond, so as to bring a plurality of mesh wraps around the pipe, ensuring that PU resin is always present and / or applied between successive wraps .
    公开号:BE1021667B1
    申请号:E2012/0679
    申请日:2012-10-10
    公开日:2015-12-23
    发明作者:Cornelis Christianus Rombouts
    申请人:C.C. Rombouts Kunststof Techniek Holding B.V.；
    IPC主号:
    专利说明:

    Title: Method for covering, protecting and reinforcing 20 'pipes
    The invention relates to the covering, protection and reinforcement of pipes, tubes or pipes, of plastic or metal.
    It is known to manufacture pipelines from plastic or metal.
    The choice of material will depend on the medium to be transported and the expected pressure in the pipe. Metal pipelines, typically of steel, are in principle stronger than plastic, but are more susceptible to attack by moisture and / or chemicals. For plastic pipes, polyethylene or polypropylene is often used as material. Polyethylene (PE) is a thermoplastic plastic that is widely used in the art and is known in many degrees and is used in many fields, including packaging material but also, for example, transport lines. The melting temperature (or range) depends on the precise implementation of the polymer, such as molecular weight and density, but is typically in the range of 105 to 115 ° C for low-density PE and around 200 ° C for medium and high density PE. An important reason why PE is used in many industrial and technical areas is the fact that the material has a high chemical resistance.
    Similar comments as above also apply to polypropylene i (PP). There are also copolymers of PP and PE, for which similar comments apply. In the following, the term PE / PP will be used in the sense of "PE and / or PP", or "the polymer PE or the polymer PP or the copolymer PE + PP".
    A drawback of plastic transport pipes is that the permitted working pressure in the pipe is limited in comparison with metal pipes. The pipe may burst if the operating pressure is too high.
    In addition, it is desirable to thermally insulate transport lines, depending on the temperature of the medium to be transported.
    It is an object of the present invention to provide a method for covering, protecting, insulating and reinforcing pipes, in particular industrial transport pipes.
    To this end, according to the present invention, a fiberglass-reinforced PU coating is applied around the pipe.
    Polyurethane (PU) is a collective term for the polymers that result from reaction of molecules that have an isocyanate group with molecules that have a hydroxyl group; more particularly, a polyisocyanate in liquid form is mixed with a polyalcohol in liquid form, with the addition of a catalyst and any other additives. The mixture is called "resin." After the completion of the polymerization reaction, the resulting resin has an appearance which depends on the choice of catalyst and additives; that shape can be a foam, but also a solid, glass-like substance.
    It is noted that Dutch patent 1033399 describes a method for coating and protecting a welded connection between steel pipes, wherein a sheet of PE or PP is wound around the welding site, whereafter in the annular space between the pipes and it into a tube formed sheet a curing substance is introduced in liquid form.
    These and other aspects, features and advantages of the present invention will be further elucidated by the following description with reference to the drawings, in which like reference numerals indicate like or similar parts, wherein "below / above", "higher / lower", " left / right "etc only relate to the orientation shown in the figures, and in which: figures 1A-1B schematically illustrate a weld area of a coated steel pipe; figures 2A-2C schematically illustrate a method for coating a tube according to the present invention; Figures 3A-3C schematically illustrate some examples of coated pipe sections.
    For a general description of steel transport pipes, segments of which are welded together, reference is made to Dutch patents 1033399 and 1037432, the contents of which are hereby incorporated by reference, so that the following explanation can be kept brief. Figure 1A is a side view which schematically shows a part of a transport line 1. The line 1 consists of steel pipe segments 2, the respective ends of which are always welded together; the weld is indicated by the reference numeral 4. The pipe segments were manufactured in a factory with a certain standard length that can be, for example, 6 m but can also be 20 m. In the example shown, the pipe segments in the factory were furthermore provided with a plastic jacket 3 of for instance a PP or PE. The welding together was carried out in situ. To enable welding, end portions of the pipe segments 2 were left clear of this plastic jacket 3, or this jacket was removed, over a length of about 20 cm. In order to obtain a really good protection for the pipe 1, it is essential that the weld region 5, consisting of the weld 4 and the exposed end portions of the pipe segments 2, is provided with a good coating.
    Figure 1B shows a longitudinal section of the welding area 5 on a larger scale. The end portions of the pipe segments 2 as well as the weld 4 may, if desired, be suitably prepared, typically cleaned by sandblasting. Adjacent to the welding area 5, part of the outside of each casing 3 is always removed, for example by milling or sanding, so as to provide each casing 3 with a recessed lying end platform 31 with a smaller outer diameter.
    The present invention provides a method for coating, protecting and reinforcing metal or PE / PP pipes and conduits. The method proposed by the invention can be used for reinforcing pipes over their entire length, or specifically in the area of a weld.
    Figure 2A schematically shows a cross section of a tube 210 with an outer surface 211.
    According to the present invention, liquid PU resin 220 is applied to the outer surface of the tube, for example by spraying, spraying, rolling, brushing, or impregnating, as shown in Figure 2B. By this is meant a resin whose polymerization reaction is in any case not yet complete. Although the speed of operation is not in itself critical, it is preferred that the resin be applied shortly after mixing the liquid reaction components. If the application is by spraying with a spray gun, it is preferred that the mixing of the liquid reaction components takes place in the spray gun. The PU resin will have assumed a solid state after the completion of the polymerization reaction, for example in the form of a solid layer, depending on the precise choice of the reaction components, catalyst and additives.
    A glass fiber mesh 240 is applied to the wet PU. This is done 360 ° in the circumferential direction. PU resin is again applied to the applied layer of gauze, and the winding of the gauze is continued, as shown in Figure 2C. In this way a plurality of mesh windings are applied around the tube, whereby it is ensured that PU resin is always present and / or applied between successive windings. After the PU resin has hardened, the tube is surrounded with a fiberglass-reinforced PU coating that is particularly strong and adheres very well to the tube. As a result, the tube is able to withstand very high internal pressures without breaking or tearing.
    It is noted that in the foregoing the application of the glass fiber laminate has only been described and illustrated for the circumferential direction. Lamination can be performed locally around a weld connection. However, the lamination can also be carried out over the full length of the tube. This can then be a PE / PP pipe that is reinforced over its entire length, or a metal pipe that is covered and protected over its entire length.
    Reference is now again made to Figs. 1A-B and the accompanying description, in which it is explained that a steel pipe coated with a PE / PP jacket 3 is manufactured by welding together steel pipe segments 2, whereby a jacket-free welding region 5 is formed, consisting of the weld 4 and the end sections of said pipe segments 2. To protect the steel in the weld region 5, a glass-fiber-reinforced PU coating is provided around it according to the invention by applying glass-fiber mesh in wet PU around the end sections of the steel pipe segments 2. wrapping in the same manner as described above with reference to Figs. 2B-2C. The PU has a good adhesion to the steel, and offers the steel a good protection, while the design as a glass fiber laminate has a particularly good mechanical strength, which is well resistant to the mechanical loads caused by applying such a material. transport pipeline in the ground.
    Conveying pipes not only consist of straight pipes, but can also contain bends, manifolds and the like. Such parts will be referred to as "pieces of art". Those pieces of art can be provided with coupling flanges for coupling with tube parts or other pieces of art. Like the straight tube parts, the pieces of art can be made of metal or PE / PP, and just like with the straight tube parts, there is a desire for the pieces of art to reinforce, protect and / or insulate them. It is common in the prior art to provide an insulating jacket around art pieces, but only around the straight pipe segments of such art pieces. In particular the coupling flanges are released. After making a coupling with other pipe parts or art pieces, the entire coupling is then cast in an insulating material. According to the present invention, on the other hand, a piece of art is provided with a glass fiber-reinforced PU coating over its entire outer surface, including any coupling flanges.
    Figures 3A-3C show some examples of such art pieces.
    Figure 3A shows a 90 ° bend piece 310, consisting of a bend part 311 with coupling flanges 312 and 313 at its ends. A PU coating 316 reinforced with fiberglass laminate has been applied over the entire outer surface. The coating 316 also extends over the outer surfaces of the coupling flanges 312 and 313.
    Figure 3B shows a T-adapter 320 consisting of a main pipe part 321 with coupling flanges 322 and 323 at its free ends, and a branch pipe part 324 welded thereto with a coupling flange 325 at its free end. A PU coating 326 reinforced with fiberglass laminate has been applied over the entire outer surface. The coating 326 also extends over the outer surfaces of the coupling flanges 322 and 323 and 325.
    Figure 3C shows a manifold or "header" 330 consisting of a main pipe part 331 with coupling flanges 332 and 333 at its free ends, and some branch pipe sections 334 welded thereto with respective coupling flanges 335 at their respective free ends. A PU-coating 336 reinforced with fiberglass laminate has been applied over the entire outer surface. The coating 336 also extends over the outer surfaces of the coupling flanges 332 and 333 and 335.
    Works of art can be even more complex. Instead of straight pipe parts, the pipe parts can comprise one or more bend pieces. The pipe parts themselves can also be branched. It is special that all outer surfaces are provided with a fiberglass-reinforced PU-coated PU coating, also the bend parts (figure 3A), and also the welding areas (figures 3B and 3C), so that they are fully protected. Furthermore, it is special that the possible welding flanges are provided with a fiberglass-reinforced PU coating. Thus, after coupling of these pieces of art, unbroken insulation is guaranteed, and it is not necessary to pour in the coupling. Any coupling bolts or pressure rings will engage on the coating, which is permitted due to the fact that the PU-fiber reinforced laminate reinforced coating is particularly strong. If a piece of art is to be welded to a pipe part and therefore has no coupling flange at a coupling end, that coupling end is left clear of the coating over a certain length, and after coupling the coupling is protected by the winding process described above.
    It will be clear to a person skilled in the art that the invention is not limited to the exemplary embodiments discussed above, but that various variants and modifications are possible within the scope of the invention as defined in the appended claims. For example, it is possible that a piece of art comprises a valve.
    Furthermore, the application of the laminate is not limited to spraying, spraying, rolling, brushing, or impregnating, but it is also possible to apply fiberglass-reinforced PU coating by injection and / or under vacuum.
    Features described only for a particular embodiment are also applicable to other described embodiments. Features of different embodiments can be combined to achieve a different embodiment. Features that are not explicitly described as being essential may also be omitted.
    The reference numerals used in the claims are for the purpose of clarification only when the claims are understood in the light of the exemplary embodiments described, and should not be interpreted in any way as being restrictive.
    权利要求:
    Claims (14)
    [1]
    CONCLUSIONS
    A method for coating a pipe (210), which method comprises the step of applying a glass fiber reinforced PU laminate around the pipe.
    [2]
    The method of claim 1, wherein the glass fiber-reinforced PU laminate is applied over the full length of the tube.
    [3]
    The method of claim 1 or 2, wherein the tube is a metal tube.
    [4]
    Method for coating the stripped weld region (5) of two steel pipe segments (2) welded together with their respective ends, provided with a PE / PP sheath (3), which method comprises the step of applying a fiberglass-reinforced PU laminate around the exposed steel pipe sections in said weld area (5).
    [5]
    A method according to any one of the preceding claims, wherein the glass fiber-reinforced PU laminate is applied by the steps of: a) applying liquid PU resin (220) to the outer surface of the tube, for example by spraying, spraying, rolling, brushing or impregnating, or for example by injection and / or under vacuum; b) applying a fiberglass mesh (240) to the wet PU; c) continuing steps a) and b) through 360 ° and beyond, so as to bring a plurality of mesh windings around the tube, ensuring that PU resin is always present and / or applied between successive windings .
    [6]
    Transport line (1), comprising a system of steel pipe segments (2) provided with a PE / PP sheath (3), in which ends of successive pipe segments are always stripped of the sheath and welded to each other, and wherein the welding area (5) ) of at least one of the welds is coated with a method according to any one of claims 1-5.
    [7]
    7. Transport pipe (1), comprising a system of steel pipe segments (2), wherein the ends of successive pipe segments are always welded to each other, and wherein the pipe is covered along its entire length with a method according to any one of claims 1-5.
    [8]
    The method of claim 1 or 2, wherein the tube is a PE / PP tube.
    [9]
    9. Transport line, comprising at least one PE / PP pipe section which is provided at least partially but preferably over its entire length with a glass fiber-reinforced PU laminate applied around it.
    [10]
    A piece of art (310; 320; 330) for a transport line, which piece of art is provided over its entire outer surface with a glass fiber laminate reinforced PU coating (316; 326; 336).
    [11]
    11. Art piece according to claim 10, made from metal or PE / PP.
    [12]
    The piece of art according to claim 10 or 11, wherein the piece of art comprises at least one bend part (311).
    [13]
    The piece of art according to claim 10 or 11 or 12, wherein the piece of art comprises a main pipe part (321; 331) and at least one branch pipe part (324; 334) making an angle with said main pipe part.
    [14]
    Art piece according to any of claims 10-13, provided with at least one coupling flange (312, 313; 322, 323, 325; 332, 333, 335), wherein the fiberglass-reinforced PU-coated PU coating also extends over the outer surfaces of each coupling flange.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE102012109686A1|2013-04-18|
    NL1039845C2|2013-04-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4676276A|1981-10-20|1987-06-30|Fawley Norman|Method of treating a pipe and product produced thereby|
    WO1998037303A1|1997-02-24|1998-08-27|Fiberspar Spoolable Products, Inc.|Composite spoolable tube|
    EP2163800A2|2008-09-15|2010-03-17|Salzgitter Mannesmann Line Pipe Gmbh|Additional cladding of the connection area of steel pipelines clad with cement mortar and such an additionally clad steel pipeline|
    WO2011049668A2|2009-10-20|2011-04-28|Pipestream B.V.|Method and apparatus for reinforcing a pipeline|
    NL1033399C2|2007-02-15|2008-08-18|Nederlandse Gasunie Nv|Coating method for welded joint between coated metal pipes, comprises applying primer to exposed area and injecting plastic into space defined by tubular sheet of fibrous material|
    NL1037432C2|2009-11-02|2011-05-03|C C Rombouts Kunststof Techniek Holding B V|METHOD FOR LOCKING A CONNECTION BETWEEN TWO TUBES.|EP3500633B1|2016-08-17|2021-10-06|PPG Coatings Europe B.V.|Coated conduits and methods of repairing or reinforcing conduits|
    法律状态:
    2017-10-30| PD| Change of ownership|Owner name: ROMBOUTS KUNSTSTOF TECHNIEK B.V.; NL Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), AFFECTATION / CESSION; FORMER OWNER NAME: C.C. ROMBOUTS KUNSTSTOF TECHNIEK HOLDING B.V. Effective date: 20170524 |
    2017-10-30| FG| Patent granted|Effective date: 20151223 |
    2019-06-26| MM| Lapsed because of non-payment of the annual fee|Effective date: 20181031 |
    优先权:
    申请号 | 申请日 | 专利标题
    NL1039102|2011-10-12|
    NL1039102|2011-10-12|
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