• 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:
    Conduction for transporting fluids at cryogenic temperatures, formed by a pipe (1), an insulation (2) thereof, at least a vapor barrier (6), a fireproofing material (5), and an outer coating system. The coating system has several metal shells (3), each metal shell (3) overlapping on itself and overlapping the adjacent metal shell. The fixing and closing of these metal enclosures (3) is done by metal straps (4). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2717974A1
    申请号:ES201830791
    申请日:2018-07-31
    公开日:2019-06-26
    发明作者:Suarez José Guillermo Suarez-Valdes
    申请人:Aislamientos Suaval SA；
    IPC主号:
    专利说明:

    [0001]
    [0002]
    [0003]
    [0004] Field of the Invention
    [0005]
    [0006] The present invention belongs to the technical field of fluid treatment facilities at cryogenic temperatures, specifically to the insulation, flame retardant protection and coating of the pipes carrying said fluids
    [0007]
    [0008] The invention relates in particular to a conduit for transporting fluids at cryogenic temperatures, of the type that are formed by a pipe for transporting the fluid, an insulation of the pipe and a coating system arranged around the insulation. The whole set once isolated is supported in its final position directly on supports.
    [0009]
    [0010] Background of the invention
    [0011]
    [0012] Various conduction systems and pipes for the transport of cryogenic fluids at cryogenic temperatures are known from the prior art. This type of pipes requires insulation materials that withstand cryogenic temperatures without losing their insulating properties. The most efficient insulation materials for this type of work are polyurethanes, cellular glasses and resilient mineral fibers, which can be placed in several layers. In addition, vapor barrier systems and joint seals are needed to avoid interstitial condensations that cause ice pockets and breakage of the insulation and sealing layers. Additionally, in all joints between insulation layers, terminations and vapor barriers, the use of sealants that withstand cryogenic temperatures is required to avoid interstitial condensation.
    [0013]
    [0014] Finally, a coating system of the pipe and all the previous insulation is required that guarantees a mechanical resistance and a fire resistance required in plants that work at such low temperatures. In the current facilities all these pipes and these insulating and coating systems they must be of great capacity and complexity to maintain the temperature of the fluids avoiding their phase change, and also guarantee highly demanding safety conditions.
    [0015]
    [0016] Traditionally, the pipe to be insulated was supported in its final position by means of pre-insulated cryogenic metal supports with high density polyurethane. Once installed and welded to said metal supports, it was insulated. For this, the insulation materials were placed in the form of pieces cut and preformed in the field, and were finished off against the previously installed cryogenic supports. Once the insulation and vapor barriers were assembled, the coating was finished off against these cryogenic supports.
    [0017]
    [0018] Due to the great complexity and high cost of the installation directly in the field of the various insulation layers, vapor barriers, sealants and metal coatings, an alternative used today is the use of pre-insulated pipes in central manufacturing workshops , with insulation and coating systems that reduce the installation times of the pipes in the field, and therefore reduce the construction time of the installation, and on the other hand increase the quality control and traceability of the installed product. In these pre-insulated pipe systems in central manufacturing workshops, the coating materials used are high-strength and continuously applied plastic materials that provide the necessary mechanical strength to deposit the pre-insulated pipes, in long sections of 6 or 15 meters in length, on conventional supports, not pre-insulated with PUR from the cryogenic installation without deformation or breakage of the pipe. In this workshop pre-insulation system, various materials are used in preformed plate, roll or spray formats for pipe insulation, and are applied by robots or manually. For the coating system, also pre-installed, plastic materials are used, and they are applied by robots that provide the system with a plastic layer of several millimeters, which provides the necessary mechanical strength so that the pipe can be transported in sections of 6 or 15 meters, and deposited on supports of the installation without the insulation system undergoing deformation or breakage. In this case, once in the field, the pre-installed coating system represents the last vapor barrier and insulation protection against the atmospheric agents existing in the installation.
    [0019] The disadvantage of this pre-insulated and pre-installed coating system in the workshop is that the plastic coating materials offer a low fire resistance, so it is necessary to reinforce the system with intermediate layers between the insulation and the coating, to ensure that the The system offers the minimum guarantees that the technical specifications of the plants require in case of an explosion in the plants.
    [0020]
    [0021] Metal coatings do improve the fire resistance requirements that plants demand, as they were done directly in the field, by means of preformed tubes of 1 m to 1.3 m in length and crimped together, but they are not sufficient for the demands of the sector of recent years.
    [0022]
    [0023] There are solutions such as the one of the patent application previous patents such as that of Patent 2585709B1, in the name of the same applicant as the present application, which base their design on a metal top cap, a metal bottom cap, metal braces that join them and a plurality of plates between consecutive braces, but which present certain drawbacks, such as problems for efficient series manufacturing of the curved lower and upper covers, with lengths longer than 6 meters and tight tolerances, and with thicknesses greater than 5 mm of sheet so that they have sufficient mechanical strength considering the current standard manufacturing means for this type of sheet. Another drawback is the need to manufacture specific caps for each conduction size and insulation thickness, which causes the prefabrication system to be highly complex, limiting the capacity for mass production. Additionally there is the inconvenience of the intrinsic difficulty to the complete coating system, given the dimensions of the parts and adjustments required.
    [0024]
    [0025] It was therefore desirable a conduit for transporting fluids at pre-insulated cryogenic temperatures, with a simple coating system that would protect the insulation of the pipes efficiently, with good fire resistance properties, adapted to the current demands of the plants in case of explosion in them, and avoiding the inconveniences existing in the previous coatings of the prior art.
    [0026] Description of the invention
    [0027]
    [0028] The present invention solves the problems existing in the state of the art by means of a conduit for transporting fluids at cryogenic temperatures, of the type that are formed by a pipe for the transport of the fluid at cryogenic temperature, an insulation of the pipe that is It has around the pipe, and it can consist of one or several layers of insulation and sealing, at least one vapor barrier around the insulation, one or several layers of fire retardant material around the vapor barrier, and a metal coating system pre installed in workshop arranged in turn externally to these layers.
    [0029]
    [0030] The new coating system consists of several metal envelopes arranged around the layer of flame retardant material, axially along the conduit, which are assembled, but not fixed together, and embraced with metal strips around the conduction.
    [0031]
    [0032] The metal envelopes are overlapped on themselves, that is, they have a circumferential overlapping section. Additionally, each of the metal envelopes overlaps with the adjacent metal envelope, that is, there is a section of axial overlap between adjacent metal envelopes.
    [0033]
    [0034] The purpose of these overlaps is to guarantee a metallic coating that adapts perfectly to the geometry of the conduction and that resists the weight of the pipe, is not damaged in the transport of the conduction to the installation or in the placement of it on the supports final, nor during the operation of plant driving at cryogenic temperatures. In addition, the joints of the metallic coating allow to absorb the displacements of mechanical and thermal origin that the conduction undergoes without opening, guaranteeing the integrity and security of the system.
    [0035]
    [0036] Additionally, and according to a preferred embodiment, the section of axial overlap between adjacent metal envelopes has a recess of one of the metal envelopes, such that the outer covering is completely cylindrical and without protrusions.
    [0037] In accordance with the present invention, all the elements that are part of the coating system, that is, the envelopes and the strips, are made of metallic material, which provides excellent protection and fire resistance to the pipe and its insulation.
    [0038]
    [0039] In addition, since the coating system presents the novelty of being formed by a system of sheet metal envelopes that are not fixed to each other and that are embraced by metal strips, the system gives the necessary mechanical strength so that the conduction is hoisted in sections between 3 and 12 meters in length without breaking the interior insulation. Additionally, as the plates fixed to each other do not go, they absorb the movements and vibrations produced in the loading and unloading maneuvers of the conduction without exposing the insulation system, since it has the freedom to travel the overlaps. This coating provides the system with a fire resistance far superior to plastic coatings. In addition, since this coating system is prefabricated in workshops, shortening the execution times of field assembly, also eliminating the safety risks arising from complex field assemblies.
    [0040]
    [0041] For the components of the coating system, stainless steel, galvanized steel, aluminum or auzinc are preferably used, due to their ease of forming and high fire resistance, although any other metallic material can be used depending on the needs and environmental conditions of the installation in which the pipes are used.
    [0042]
    [0043] Brief description of the drawings
    [0044]
    [0045] Next, to facilitate the understanding of the invention, an illustrative but non-limiting way will describe an embodiment of the invention that refers to a series of figures.
    [0046]
    [0047] Figure 1 is a perspective view of a conduit for the transport of fluids at cryogenic temperatures in accordance with the present invention showing its essential elements.
    [0048]
    [0049] Figure 2 is a cross-sectional view of the conduit of Figure 1.
    [0050] Figure 3 shows a detail of a section of circumferential overlap in a metal envelope.
    [0051]
    [0052] Figure 4 is a perspective view of the conduit already insulated in accordance with the present invention showing the coating system along the length of the conduction.
    [0053]
    [0054] Figure 5 shows a detail of a section of axial overlap between adjacent envelopes.
    [0055]
    [0056] Figure 6 is a cross-sectional view of an embodiment of the conduit of the present invention disposed on a metal support.
    [0057]
    [0058] In these figures reference is made to a set of elements that are:
    [0059] 1. pipe
    [0060] 2. pipe insulation
    [0061] 3. metal envelopes
    [0062] 4. metal straps
    [0063] 5. fireproof material layer
    [0064] 6. vapor barrier
    [0065] 7. metal driving bracket
    [0066] 8. metal bracket closure
    [0067] A. circumferential overlap of metal envelopes
    [0068] B. axial overlap between adjacent envelopes
    [0069]
    [0070] Detailed description of the invention
    [0071]
    [0072] The object of the present invention is a conduit for transporting fluids at cryogenic temperatures.
    [0073]
    [0074] As can be seen in the figures, the conduit has a pipe 1 for transporting the fluid at cryogenic temperature, an insulation 2 arranged around the pipe 1, at least one vapor barrier 6 arranged around the insulation 2, one or several layers of fireproofing material 5 around the barrier of steam, and an outer covering system of the conduit, arranged around the layer of flame retardant material 5. The coating system is formed by metal envelopes 3 arranged around the layer of flame retardant material 5, axially along the conduit , and which are not fixed together, and a plurality of metal strips 4 arranged spaced apart from each other around the metal envelopes 3, for fixing said metal envelopes 3 along the conduit around the layer of flame retardant material 5. The use of these metallic straps 4 guarantees a secure, simple and robust fixing.
    [0075]
    [0076] According to different particular embodiments, the vapor barrier or barriers 6 are mounted with minimum overlaps of 20 mm both circumferentially and axially between different adjacent vapor barrier sections 6.
    [0077]
    [0078] Similarly, according to different embodiments, the layer or layers of flame retardant material 5 are of small thickness, less than 10 mm each.
    [0079]
    [0080] The coating material has a plurality of metal envelopes that are installed on the layer or layers of flame retardant material 5, which preferably have a length between 500 and 2000 mm.
    [0081]
    [0082] Each of the metal envelopes 3 has a circumferential overlap section A. Also, there is an axial overlap section B between adjacent metal envelopes 3. Figures 3 and 5 show in detail these overlapping sections A and B.
    [0083]
    [0084] These sections of overlaps A and B in the metal enclosures 3 of the coating system guarantee an easy assembly, a good coupling between metal enclosures 3 in the movements and displacements of the conduction during loading, unloading and placement of the latter in its position final, as well as adequate absorption of dilations and contractions during the operation of the driving.
    [0085]
    [0086] Preferably, the circumferential overlap section A of each of the metal envelopes 3 is at least 20 mm, while also, preferably, the axial overlap section B between adjacent metal envelopes 3 is at least 20 mm.
    [0087] A preferred embodiment of the invention can be seen in Figure 5, in which the axial overlap section B between adjacent metal envelopes 3 has a recess of one of the metal envelopes, to keep the outer diameter of the pre-insulated insulated conduit constant. The axial overlap section B between adjacent metal enclosures 3 allows the relative movements between the metal enclosures 3 to be absorbed with all due to the mechanical loads generated during the transfer of the pre-insulated sections from the prefabrication zone to its positioning on site (slinging) , transport, unloading, support on final supports), such as mechanical and thermal loads produced during commissioning and operation of conduction at cryogenic temperatures.
    [0088]
    [0089] Likewise, the existence of the recess allows to have the same outer diameter in all the metal enclosures 3 of the conduit and in the joints thereof, without the existence of bulges and / or curbs of completion of the sheets that could have mechanical interference with the metal support 7 on which field driving rests.
    [0090]
    [0091] In particular, the metal strips 4 are installed along the conduit with distances between them of at least 50 mm. Preferably, the distance between metal strips 4 is homogeneous, with a minimum of four metal strips 4 per linear meter of the conduction, and a maximum of twenty metallic strips 4 per linear meter of conduction.
    [0092]
    [0093] Preferably each metal strip 4 will have a thickness of at least 0.4 mm, and preferably a width of at least 4 mm.
    [0094]
    [0095] Preferably, both the metal envelopes 3 and the metal strips 4 are made of stainless steel, galvanized steel, aluminum or aluzinc, due to the high fire resistance of these materials.
    [0096]
    [0097] As can be seen in Figure 6, the conduction with the insulation material 2, the vapor barrier 6, the layers of fire retardant material 5 and the coating system directly rests on the metal supports 7 that are closed by nut systems -screw 8. In this way the driving is self-supporting and not It requires additional elements and structures, such as cryogenic supports pre-insulated with high density polyurethane for installation, so they can be installed directly on the metal supports 7 for field operation.
    [0098]
    [0099] Once the invention is clearly described, it is noted that the particular embodiments described above are subject to modifications in detail as long as they do not alter the fundamental principle and essence of the invention.
    权利要求:
    Claims (12)
    [1]
    1. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, which includes
    - a pipe (1) for transporting the fluid at cryogenic temperature,
    - an insulation (2) of the pipe (1) arranged around said pipe (1), - at least one vapor barrier (6) arranged around the insulation (2), - at least one layer of flame retardant material (5) arranged around the vapor barrier (6),
    - and a coating system arranged around the layer of flame retardant material (5),
    characterized in that the coating system comprises
    - a plurality of metal envelopes (3) arranged around the layer of flame retardant material (5), axially along the conduit, and not fixed to each other, - each of the metal envelopes (3) comprising an overlapping section circumferential (A),
    - and comprising an axial overlap section (B) between adjacent metal envelopes (3),
    - and a plurality of metal strips (4) arranged spaced apart from each other around the metal envelopes (3), configured for fixing said metal envelopes (3) to the conduction around the layer of flame retardant material (5).
    [2]
    2. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to the preceding claim, characterized in that the length of each of the metal envelopes (3) is arranged between 500-2000 mm.
    [3]
    3. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the circumferential overlap section (A) of each of the metal envelopes (3) is at least 20 mm.
    [4]
    4. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the axial overlap section (B) between adjacent metal envelopes (3) is at minus 20 mm
    [5]
    5. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the axial overlap section (B) between adjacent metal envelopes (3) comprises a recess of one of the metal envelopes (3) configured to keep the outside diameter of the pre-insulated conduction constant.
    [6]
    6. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the metal strips (4) have a thickness of at least 0.4 mm.
    [7]
    7. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the metal strips (4) have a width of at least 4 mm.
    [8]
    8. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the metal strips (4) are arranged with a distance between them of at least 50 mm.
    [9]
    9. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to the preceding claim, characterized in that the distance between metal strips (4) is homogeneous, with a minimum of four metal strips (4) per linear meter of conduction, and a maximum of twenty metal straps (4) per linear meter of conduction.
    [10]
    10. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the vapor barrier (6) comprises a plurality of envelopes comprising a circumferential overlap portion in each of the envelopes of the minus 20 mm, and a section of axial overlap between adjacent envelopes of at least 20 mm.
    [11]
    11. Self-supporting pre-insulated conduction for transporting fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that The layer of flame retardant material has a maximum thickness of 10 mm.
    [12]
    12. Self-supporting pre-insulated conduction for the transport of fluids at cryogenic temperatures, according to any of the preceding claims, characterized in that the metal envelopes (3) and the metallic strips (4) are made of a material selected from stainless steel, galvanized steel, aluminum , aluzinc, and combination of them.
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    同族专利:
    公开号 | 公开日
    ES2717974B2|2019-11-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB1364241A|1970-05-11|1974-08-21|Wavin Bv|Heat-insulation of oipe-lines|
    US3845974A|1972-01-27|1974-11-05|Air Liquide|Coupling device for a transfer conduit for a cryogenic liquid|
    US20120211117A1|2010-10-20|2012-08-23|Sproule Iii Charles G|Water resistant adjustable jackets for insulated pipe and pipe bends|
    WO2017068135A1|2015-10-22|2017-04-27|Technip France|Method for assembling a rigid conduit and associated conduit|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201830791A|ES2717974B2|2018-07-31|2018-07-31|PRE-INSULATED SELF-DRIVING DRIVING FOR TRANSPORTATION OF FLUIDS TO CRIOGENIC TEMPERATURES|ES201830791A| ES2717974B2|2018-07-31|2018-07-31|PRE-INSULATED SELF-DRIVING DRIVING FOR TRANSPORTATION OF FLUIDS TO CRIOGENIC TEMPERATURES|
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