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WO2017137769A1 - Bande de protection contre la corrosion - Google Patents

Bande de protection contre la corrosion Download PDF

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Publication number
WO2017137769A1
WO2017137769A1 PCT/GB2017/050360 GB2017050360W WO2017137769A1 WO 2017137769 A1 WO2017137769 A1 WO 2017137769A1 GB 2017050360 W GB2017050360 W GB 2017050360W WO 2017137769 A1 WO2017137769 A1 WO 2017137769A1
Authority
WO
WIPO (PCT)
Prior art keywords
corrosion
layer
shear
self
joint
Prior art date
Application number
PCT/GB2017/050360
Other languages
English (en)
Inventor
Brian Dunsterville
Steve Crawley
Original Assignee
Winn And Coales International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Winn And Coales International Ltd filed Critical Winn And Coales International Ltd
Priority to AU2017218652A priority Critical patent/AU2017218652A1/en
Publication of WO2017137769A1 publication Critical patent/WO2017137769A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B11/00—Layered products comprising a layer of bituminous or tarry substances
    • B32B11/04—Layered products comprising a layer of bituminous or tarry substances comprising such bituminous or tarry substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B11/046—Layered products comprising a layer of bituminous or tarry substances comprising such bituminous or tarry substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B11/00—Layered products comprising a layer of bituminous or tarry substances
    • B32B11/10—Layered products comprising a layer of bituminous or tarry substances next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/18—Layered products comprising a layer of natural or synthetic rubber comprising butyl or halobutyl rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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    • B32—LAYERED PRODUCTS
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage
    • 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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectable pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2274/00—Thermoplastic elastomer material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/542—Shear strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/548—Creep
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/752—Corrosion inhibitor
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/762—Self-repairing, self-healing
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2581/00—Seals; Sealing equipment; Gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Definitions

  • the present invention relates to a corrosion-protection tape, in particular a tape for protecting metallic pipe, pipe joints and fittings, and to a kit and method for protecting such components.
  • Pipelines typically comprise metallic pipe elements. Pipe elements are typically cylindrical, several metres in length, and can be assembled contiguously, jointed, and welded to form a continuous pipeline. In buried situations, metallic pipe elements are vulnerable to corrosion. To mitigate metallic corrosion, a corrosion protection layer is commonly applied to the external surface of the pipe elements.
  • the corrosion protection layer on the pipeline is known as the "mainline coating” or the “factory-applied coating” or the “parent coating”.
  • the corrosion protection layer must be absent from the area of the weld and the area adjacent to the weld.
  • the corrosion protection layer is either substantially removed from this area prior to jointing and welding, or else it is not applied to this area in the first place.
  • This area is known as the "cutback" and typically extends around the full circumference of the pipe some 150 mm either side of the weld.
  • the edge of the corrosion protection layer adjacent to the cutback may be chamfered or otherwise treated to facilitate subsequent coating processes.
  • the contiguous pipe elements formed by the jointing and welding process are protected by a corrosion protection layer, along the major portion of the pipe element.
  • the F-JC is typically overlapped onto the mainline coating and extended onto the mainline coating about 50 mm to 100 mm either side of the cutback area.
  • the F-JC is selected to be:
  • Creep is, in essence, a long term visco-elastic, or "cold-flow" phenomenon, common to all polymeric substances.
  • the amount of creep will depend upon the physical properties of a coating. Since the physical properties (i.e. modulus) of a coating, will be temperature dependent, temperature becomes a decisive element in determining the amount of creep. At low temperatures, the propensity of the protective coating to creep will be substantially reduced, while at elevated temperatures, the likelihood of creep will be significantly increased, other factors remaining the same.
  • Coatings suitable for protecting pipelines from corrosion are known and include, for example, US1777107 which discloses "permanently plastical protective coating for underground pipe and the like... that will not become brittle or crack".
  • US1777107 discloses "permanently plastical protective coating for underground pipe and the like... that will not become brittle or crack”.
  • the development of this type of compound was prompted by an investigation into gas explosions in 1925-1926 in Berlin which were found to have been caused by gas escaping from unprotected corroded gas pipe. Later the compound, in a tape form, was used to prevent stray current corrosion in pipe laid adjacent to the tracks of electrical trams.
  • Such coatings are typically employed in conjunction with a separate mechanically protective outer layer to reduce the risk and mitigate the harmful effects of damage from sharp stones and rocks and the like.
  • mechanically protective outer layers can be used. Hot-applied "torch-on" products, often based on bitumen, were originally used. More recently, cold-applied filmic wraps, often based on polyethylene film or flexible PVC film, have been used. This latter type of wrap is typically stretched around the pipe helically and thereby exerts pressure, or so-called "hoop tension" on the protective coating.
  • One advantage of this arrangement is that if the coating is mechanically punctured, there is a tendency for the underlying coating to flow into the area of damage and the system is, to some extent, self-healing. This cold flow self-healing effect is further enhanced by the inclusion of a semi-solid primer or paste applied to the pipe surface, which likewise flows into the area of damage.
  • Shear forces acting on the pipe coating can arise from, for example, the weight of the backfill, the weight of the pipe and the weight of the contents of the pipe. Movement of the pipeline can arise from thermal expansion or contraction, and gravitational settlement of the pipeline through the soil. Movement in the soil can arise from moisture induced swelling or contraction of certain types of soil. Excessive shear forces, whatever the cause, are undesirable and can cause the coating to be displaced along the surface of the pipe.
  • Damage caused prior to burial can be identified by visual or electrical inspection. However, damage caused during or after burial may not be readily identified.
  • the damage caused to the coating in buried situations, by sharp stones and rocks and the like typically takes the form of gouging, indentation or ploughing of the coating and typically opens a wide path to the substrate.
  • US6420052 discloses a coating wherein "coating encapsulated micro-spheres release the encapsulated coating material in the fluid state the coating material flows into the fissure to coat the exposed substrate.
  • WO2005/005528 discloses a composition directed towards corrosion protection of buried pipelines that is discussed as having "self-recovering properties and any deformation or damage is repaired as a result of flow of the composition into holes or cavities caused by mechanical deformations or soil stresses". The range over which self-healing may be practically achieved is not discussed.
  • US4589275 discloses an "intermediate layer interposed ... to facilitate detection of pinholes and other discontinuities" and comprises a “layer of mastic which flows into and fills the irregularities of the surface”.
  • CN203530205U discloses tapes having a mineral rock sheet backing, on which a first viscoelastic layer is provided, separated from a second viscoelastic layer by a reinforcing plastic shaping network. There is no disclosure in this document that the first and second layers should have different physical properties.
  • CN202755463U discloses tapes having a mineral rock sheet backing, on which a first SBR modified bitumen layer is provided, separated from a second SBR modified bitumen layer by a glass reinforced polyester felt. There is no disclosure in this document that the first and second layers should have different physical properties.
  • the present invention provides a corrosion-protection tape for wrapping a pipe joint, the tape comprising a shear-resistant layer for contacting the pipe joint and a self-healing layer, wherein the shear-resistant layer is separated from the self-healing layer by a barrier membrane.
  • the present invention relates to a corrosion-protection tape for wrapping a pipe joint.
  • tape it is meant a strip of material in sheet form usable to cover a surface.
  • the tape will typically be provided on a reel for ease of use.
  • the likely dimensions of the tape for most applications will typically be 100 mm to 450 mm in width and 10m to 30m in length.
  • the tape serves to provide corrosion resistance to the wrapped substrate.
  • Corrosion is a natural process which is the gradual destruction of metals to their oxides by chemical reaction with their environment.
  • the tape serves to reduce or avoid contact between the metal portions of joints or pipes and their environment. By substantially excluding moisture and air the longevity of the joint is prolonged.
  • the tape comprises a shear-resistant layer for contacting the pipe joint and a self-healing layer. The physical properties of these layers are different.
  • the tape comprises a shear-resistant layer for contacting the pipe joint.
  • the shear-resistant layer forms the contact surface and is preferably adhesive or tacky to hold it onto the pipe surface when applied.
  • a shear-resistant layer it is meant that the layer substantially resists shear.
  • Shear strength which is a measure of shear resistance, can be measured using a Tinius Olsen HTE
  • Preferred values of the shear strength at 50 °C forthe shear-resistant layer are at least 0.25N/mm, preferably at least 0.4N/mm, preferably from 0.25 to 1 .5N/mm.
  • the self- healing layer will have a shear strength at 50°C atleast 0.1 N/mm, preferably at least 0.2N/mm, lower than that of the shear-resistant layer, such as below 0.25N/mm.
  • the tape comprises a self-healing layer. That is the tape comprises a layer made of a composition which has a sufficiently low viscosity to allow it to flow under pressure to fill any points of damage. Such materials are known in the art as discussed above. It is possible to assess the self-healing properties by measuring the yield point. This is the viscous or rheological property which is best associated with "self-healing". When stress is applied to a material it will not flow until the applied stress exceeds a certain value. This behaviour is commonly observed when dispensing toothpaste; the toothpaste does not flow until the tube is squeezed. Similarly, in the present invention the protective compound will not flow and self-heal until the applied stress exceeds a certain value. The higher the value the greater the resistance to flow.
  • the yield point can be obtained using an Anton Paar MCR 302 Rheometer with reference to ISO 6721 -10:2015 Determination of dynamic mechanical properties - Part 10: Complex shear viscosity using a parallel-plate oscillatory rheometer.
  • the measurements may be taken at the intended operating temperature, such as 50 °C.
  • Preferred values of the yield point at 50 °C for theself-healing layer are at most 1500Pa, preferably at most 1000Pa, preferably from 1500 to 200Pa.
  • the self-healing layer will have a yield point at 50 °C at least 1000Pa, preferably at least 2000Pa and preferably at least 2500Pa lower than that of the shear-resistant layer, such as below 900Pa.
  • the shear-resistant layer will typically have a yield point at 50 °C of at least 2500Pa, preferably at least 3500Pa.
  • the self-healing layer will have a shear strength at 50 °C at least 0.1 N/mm, preferably at least 0.2N/mm, lower than that of the shear-resistant layer, and the self-healing layer will have a yield point at 50 °C at least 10OCPa, preferably at least 2000Pa and preferably at least 2500Pa lower than that of the shear-resistant layer.
  • the tape disclosed herein may have the composition tuned to the temperature at which it is intended to be employed.
  • the layers will behave as shear-resistant and self-healing.
  • the operating temperature of the tapes disclosed herein is from 10 to 90° C, hence measurements at 50 °C are a suitable mid-point.
  • the present invention provides a corrosion-protection tape for wrapping a pipe joint, the tape comprising a shear-resistant layer when measured at 50 °C for contacting the pipejoint and a self-healing layer when measured at 50 °C, wherein the shear-resistant layeris separated from the self-healing layer by a barrier membrane.
  • Potable water pipes typically carry water at ambient temperatures. Accordingly, in some tropical regions it could exceptionally reach an operating temperature of up to about 50 °C. In cooler climates the operating temperature will be considerably lower such as from 10- 20 °C. Oil pipes have a minimum operating temperature of typically 40 °C. Higher temperatures may occur at the well head and there are often temperature excursions to 90 °C or more when the pipe is dewaxed to maintain adequate flow. Accordingly, the overall range of operating temperatures for which the tape disclosed herein is intended for use is 10-90 ° C. For wrapping water pipes the range is f rem 10 to 50 ° C and for oil pipes the range is from 40 to 90 °C.
  • the shear resistant layer and the self-healing layers are typically independently from 0.1 to 5mm thick, preferably from 0.5 to 2mm thick and most preferably about 1 mm thick.
  • the shear resistant layer may include a fabric reinforcement.
  • the fabric of the shear resistant layer is impregnated and coated with the shear resistant compound.
  • the composition forming the shear-resistant layer and/or the composition forming the self-healing layer comprise polybutene based viscoelastic material, a polyisobutylene based viscoelastic material, polymer-modified bitumen, a butyl rubber mastic or a hot melt adhesive, or mixtures of two or more thereof, and wherein the composition forming the shear-resistant layer and the composition forming the self-healing layer are different, in particular wherein the physical properties of the layers are different.
  • the shear-resistant layer and the self-healing layer are visibly discernible.
  • the self-healing layer and/or the shear resistance layer discernible, such as with different colours or pigments in contrasting colours, the extent of any damage is obvious from visual inspection.
  • the depth of damage may be estimated.
  • the shear resistance of the shear-resistant layer is greater than that of the self-healing layer.
  • Shear resistance can be measured by tensile equipment known in the art.
  • the viscosity of the self-healing layer is lower than that of the shear-resistant layer. Viscosity can be measured by rotational viscometry in accordance with methods known in the art.
  • the shear-resistant layer is separated from the self-healing layer by a barrier membrane. This layer interposed between the self-healing layer and shear resistance layer prevents co- mingling of the respective compositions.
  • the partitioning of the self-healing layer function and shear resistance function into separate layers allows each layer to be optimally formulated in respect of its intended function.
  • the barrier membrane comprises polyethylene and, preferably wherein the barrier membrane has a thickness of from 5 to 25 microns, more preferably about 15microns.
  • the tape further comprises a backing layer provided on the self-healing layer.
  • a backing layer provided on the self-healing layer.
  • Such support substrates are well known in the art and may comprise a woven or non-woven fabric. This makes the tape easier to handle and apply.
  • the tape further comprises a releasable carrier layer provided on the shear- resistant layer for removal before use. This helps to prevent the adhesive or tacky shear- resistant layer from adhering to surfaces before use.
  • the carrier layer comprises siliconised polyester and, preferably, the carrier layer has a thickness of from 50 to 150 microns, more preferably about 85 microns.
  • the present invention provides a tape which can satisfy the conflicting requirements for providing a coating to resist damage from shear stress and which can be self-healing.
  • the coating To resist shear stress the coating must resist any tendency to flow, whereas to be self-healing the coating must be able to flow.
  • the requirements for self-healing and shear resistance cannot be satisfactorily reconciled by the use of a single coating composition, but can be with the claimed tape.
  • a single composition for the coating system to self-heal it must necessarily flow at all operational temperatures.
  • the temperature of the media, and hence the coating varies during operation, shutdown, maintenance, cleaning and inspection.
  • the provision of two compositions helps to ensure beneficial properties at different temperatures.
  • the tape may further comprise additional shear-resistant or self-healing compositions, optionally separated by further barrier layers, in order to provide a laminate tape.
  • a plurality of layers may be adapted such that the function of every layer is separately optimised, in respect of shear resistance and self-repair, at a given temperature.
  • one self- repairing layer may be optimised at lower temperature and a separate self-repairing layer may be optimised to function at a higher temperature.
  • the tape comprises three such active layers, preferably including two different self-healing layers and a shear-resistant layer.
  • a kit for providing a pipe joint with corrosion protection comprises the tape as discussed herein and a flexible wrapping tape.
  • the tape of the present invention can provide a pressure gradient within the self-healing layer to achieve flow into any adjacent areas of damage, such that the material displaced down the pressure gradient and seals or substantially seals the area of damage.
  • the provision of an additional wrapping tape helps to further induce a pressure gradient to achieve this flow.
  • the flexible wrapping tape is preferably for application separately and to be helically, circumferentially, or axially wrapped around the pipe element.
  • the flexible wrapping tape comprises polyethylene or PVC.
  • a corrosion-vulnerable joint provided with a wrapping formed from the corrosion-protection tape discussed herein.
  • corrosion- vulnerable it is meant that the joint includes a material which is prone to corrosion if exposed to air, humidity or moisture, such as a metal joint.
  • the corrosion-vulnerable joint is formed between two or more metal pipes or bars.
  • the joint typically comprises a weld.
  • said pipes or bars are provided with a corrosion protection layer and a cut-back portion adjacent the joint, and the wrapping formed from the tape discussed herein covers at least said cutback portion. This serves to prevent corrosion in the protected area.
  • the corrosion-vulnerable joint is further provided with a flexible wrapping tape provided on the wrapping formed from the tape discussed herein.
  • a method of protecting a corrosion-vulnerable joint from corrosion comprising wrapping a joint with one or more layers of the tape discussed herein to form a wrapped joint and, optionally, binding the wrapped joint with a flexible wrapping tape.
  • Figure 1 shows a cross-section showing the layers of the tape.
  • Figure 2 shows a cross-sectional schematic showing the layering of tape around a joint in an embodiment of the present invention.
  • the tape has a self-healing layer 1 and a shear-resistant layer 5 separated by a barrier membrane 10.
  • the self-healing layer 1 is adjacent a backing layer 15.
  • the shear-resistant layer 5 is provided with a removable carrier layer 20.
  • the tape consists of these layers.
  • a metal pipe joint comprising a cutback area with a central welded joint and an adjacent factory applied coating on either side of the cutback is provided.
  • a section of tape as described herein is positioned to overlap onto the adjacent factory applied coating and to overlap onto the weld bead and to extend beyond the weld bead a distance of some 50 mm, said distance measured parallel to the major axis of the pipe.
  • the tape is applied around the full circumference of the pipe and overlaps onto itself in the
  • a separate section of tape is positioned over the remaining, substantially uncoated portion, the composite layer is positioned to overlap onto the proximal adjacent factory applied coating and to overlap onto the weld bead of the pipe and similarly overlaps onto the weld bead, and extend, beyond the weld bead, a distance of some 50 mm, said distance measured in the anti-parallel sense to the major axis of the pipe.
  • the composite layer is applied around the full circumference of the pipe and overlaps onto itself in the
  • a continuous layer is formed by the application of two pieces of composite layer and a double layer of coating is provided over the weld and 50 mm either side of the weld.
  • a flexible outerwrap is helically applied over the composite layer and extends 100 mm onto the factory applied coating either side of the cutback area.
  • Example 1 The present invention will now be described in relation to the following non-limiting examples.
  • Example 1 The present invention will now be described in relation to the following non-limiting examples.
  • a laminate tape was provided having the following layers in order: a shear-resistant layer, a barrier membrane, a self-healing layer and a support layer.
  • the innermost layer of the composite, the shear resistant layer was disposed against a removable interleave comprising a film of siliconized polyester, 85 micrometres in thickness. Said interleave was removed and discarded prior to the installation of the composite.
  • the layer interposed between the self-healing layer and the shear resistant layer is a film of High Density Polyethylene, being 15 micrometres in thickness.
  • the outer layer of the composite comprises a backing layer of flexible PVC film 150 micrometres in thickness.
  • the compositions of the shear-resistant layer and the self-healing layer were as set out in the table below.
  • the shear resistant layer is the blend of synthetic polymers and resin shown as composition A, and has a thickness of 1 mm across the layer.
  • the composition of the self-healing layer is the blend of synthetic polymers and resin shown as composition B, and has a thickness of 1 mm across the layer.
  • composition A B Composition A B
  • Suitable Thermoplastic elastomers may include Styrene Isoprene Styrene Block Copolymer or Styrene Butadiene Styrene Block Copolymer.
  • the compound of the shear resistant layer may comprise a polybutene based viscoelastic material, or a polyisobutylene based viscoelastic material, or polymer modified bitumen, or a butyl rubber mastic or hot melt adhesive.
  • the compound of the self-healing layer may comprise polybutene based viscoelastic material, or a polyisobutylene based viscoelastic material, or a polymer modified bitumen, or a butyl rubber mastic or hot melt adhesive.
  • Composition A and Composition B may be similar in composition; the essential feature is that the shear resistance and viscosity are different.
  • a flexible outer armouring was also provided comprising a self-adhesive PVC film applied helically and under tension, with a 55% overlap, to yield at least a double layer of protection.
  • the outer armouring comprises a self-adhesive polyethylene film applied helically and under tension, with a 55% overlap, to yield at least a double layer of protection.
  • outerwrap or outer armouring comprises a heat shrinkable film, in a tape or sleeve format.
  • the outer layer of the composite comprises a backing layer of flexible Polyethylene film 150 micrometres in thickness.
  • Example 5 As for example 1 , except the following compositions were used:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une bande de protection contre la corrosion pour envelopper un joint de tuyau, la bande comprenant une couche résistant au cisaillement destinée à venir en contact avec le joint de tuyau et une couche auto-régénérante, la couche résistant au cisaillement étant séparée de la couche auto-régénérante par une membrane barrière.
PCT/GB2017/050360 2016-02-12 2017-02-10 Bande de protection contre la corrosion WO2017137769A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2017218652A AU2017218652A1 (en) 2016-02-12 2017-02-10 Corrosion-protection tape

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1602522.3A GB201602522D0 (en) 2016-02-12 2016-02-12 Corrosion-protection tape
GB1602522.3 2016-02-12

Publications (1)

Publication Number Publication Date
WO2017137769A1 true WO2017137769A1 (fr) 2017-08-17

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AU (1) AU2017218652A1 (fr)
GB (1) GB201602522D0 (fr)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024130275A1 (fr) * 2022-12-13 2024-06-20 Brownlow George Emballage protecteur contre la corrosion
EP4442756A1 (fr) * 2023-04-04 2024-10-09 Seal for Life Global Dutch Holding B.V. Composition pour proteger un article usine contre la corrosion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284785A (en) * 1993-12-09 1995-06-21 Grace W R Ltd Protecting weld joints of pipe lines
WO2005005528A1 (fr) * 2003-07-14 2005-01-20 Frans Nooren Afdichtingssystemen B.V. Composition pour proteger un article usine contre la corrosion
CN203530205U (zh) * 2013-08-08 2014-04-09 四川天邑康和通信股份有限公司 粘弹体防腐胶带
WO2014131127A1 (fr) * 2013-02-28 2014-09-04 Shawcor Ltd. Isolant en polysulphone résistant à de hautes températures pour canalisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284785A (en) * 1993-12-09 1995-06-21 Grace W R Ltd Protecting weld joints of pipe lines
WO2005005528A1 (fr) * 2003-07-14 2005-01-20 Frans Nooren Afdichtingssystemen B.V. Composition pour proteger un article usine contre la corrosion
WO2014131127A1 (fr) * 2013-02-28 2014-09-04 Shawcor Ltd. Isolant en polysulphone résistant à de hautes températures pour canalisation
CN203530205U (zh) * 2013-08-08 2014-04-09 四川天邑康和通信股份有限公司 粘弹体防腐胶带

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024130275A1 (fr) * 2022-12-13 2024-06-20 Brownlow George Emballage protecteur contre la corrosion
EP4442756A1 (fr) * 2023-04-04 2024-10-09 Seal for Life Global Dutch Holding B.V. Composition pour proteger un article usine contre la corrosion
WO2024208838A1 (fr) * 2023-04-04 2024-10-10 Seal For Life Global Dutch Holding B.V. Composition pour la protection contre la corrosion d'un article façonné

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GB201602522D0 (en) 2016-03-30
AU2017218652A1 (en) 2018-08-23

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