WO1994026426A1 - Pipe coating - Google Patents
Pipe coating Download PDFInfo
- Publication number
- WO1994026426A1 WO1994026426A1 PCT/GB1994/001020 GB9401020W WO9426426A1 WO 1994026426 A1 WO1994026426 A1 WO 1994026426A1 GB 9401020 W GB9401020 W GB 9401020W WO 9426426 A1 WO9426426 A1 WO 9426426A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- sintered particles
- pipe
- applying
- adhesive
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/148—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using epoxy-polyolefin systems in mono- or multilayers
-
- 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
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
Definitions
- each pipe section is caused to rotate about its longitudinal axis and passed longitudinally past a concrete coating station wherein concrete/aggregate is caused to impinge upon the rotating pipe thereby building up a thickness of concrete on the pipe to form a coating.
- the concrete coating can also be applied by other methods.
- the pre- reatment of the pipe to resist corrosion affects the ability to retain a subsequently applied concrete coating in place effectively.
- this invention is directed at providing an effective anti-corrosion coating to which application of a concrete coating is facilitated.
- Fusion Bonding Epoxy coating is thought by many people in the industry to be superior in many ways for the protection of carbon steel pipelines. Fusion Bonded Epoxy is a thin film coating typically 350 ⁇ m to 500 ⁇ m in thickness. It displays superior resistance to cathodic disbonding in comparison to other conventional coatings currently commercially available. However, when being used for undersea use, it has proved difficult to get concrete weight coating to give the correct shear resistance over the epoxy film due to the latter's smooth nature.
- a currently commercially successful method relies on aggregate embedded in a one metre band of a liquid epoxy coated after the parent coating has been applied.
- this method requires the coating thickness of the epoxy to be elevated from a nominal 400 ⁇ m to 750 ⁇ m minimum and the cost increase is no longer commercially acceptable. Therefore it is an object of this invention to provide an equally effective method of providing shear resistance but at a reduced cost.
- a pipe is coated with fusion bonding epoxy (FBE) according to the known method, but to normal film thickness of about 350 ⁇ m to about 500 ⁇ m, and after application of the said epoxy a water- impermeable plastics adhesive e.g. a copolymer polypropylene based adhesive is applied by extrusion, and sintered particles are applied simultaneously e.g. by spraying, to provide a polypropylene copolymer coating thickness of about 500 ⁇ m.
- FBE fusion bonding epoxy
- the particle size of the sintered particles is not restricted but would conveniently lie in the range of about 150 ⁇ m to about 250 ⁇ m.
- the water-impermeable plastics adhesive is applied immediately after epoxy coating e.g. by side extrusion onto the pipe as it exits from the epoxy coating booth to provide optimum control of the coating thickness .
- a polypropylene based adhesive is less expensive than epoxy resin and provides a means of incorporating sintered particles throughout the length of the pipe surface, thereby providing both protective barrier coating and a shear - transfer key for the anti-buoyancy concrete coating.
- a suitably cleaned steel pipe is subjected to normal preheating (circa 232 - 260°C) and passed through an electrostatic powder spray booth wherein an epoxy powder resin is charged to the pipe surface to a controlled thickness in the range of 400 ⁇ m and cured.
- the pipe is immediately over-coated with a polypropylene copolymer adhesive from an extruder and during said over-coating step sintered polypropylene copolymer particles having a size distribution in the range of 150 ⁇ m to 250 ⁇ m are applied to provide a uniform coating up to 1 mm thick overall .
- the said sintered particles may suitably be obtained by grinding polypropylene copolymer raw material under cryogenic conditions.
- the polypropylene copolymer raw material is readily available commercially e.g.
- the pipe is thereafter passed to a concrete throwing station for application of an anti-buoyancy coating typically of from about 40 mm - 150 mm thick and having a density of 2645 kg/m based on Ilmenite.
- the concrete ' coating density may be varied from 2165 to 3125 kg/m 3 by choosing appropriate mixtures of cement, sand and iron ore.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A pipe of the type used in subterranean or submerged pipelines for recovery of oil, gas, slurries or the like pipeable materials has an anti-corrosion coating of epoxy resin having a film thickness of from about 350 νm to about 500 νm, and a protective coating of a plastics material, particularly a copolymer polypropylene based adhesive, applied over said anti-corrosion coating to a thickness of about 500 νm, which protective plastics coating incorporates compatible sintered particles i.e. sintered polypropylene copolymer particles applied therewith.
Description
Pipe Coating
This invention is concerned with coating of pipes of the type used in subterranean or submerged pipelines for recovery of oil, gas, slurries or the like pipeable materials from a subterranean well. In particular it is concerned with pipes in which a steel pipe section is coated with an anti-corrosion coating and then a concrete aggregate anti-buoyancy coating (hereinafter concrete coating) . Such pipes normally include a mechanical shear transfer device in the form of wire windings or caging applied around the anti- corrosion coating prior to application of the concrete coating. This opposes the tendency of the concrete coating to slip or jump off the anti-corrosion coated pipe during laying operations which can impose considerable bending stresses upon the pipe.
Pipe coating methods addressing the problems of effectively applying a concrete coating to a pipe treated with an anti-corrosion coating are described, for example, in US-A-3 955 600, GB-A-1 504 051/2, GB-B-2 088 992 and GB- B-2 101 499 which are representative of the known art.
In a typical coating method each pipe section is caused to rotate about its longitudinal axis and passed longitudinally past a concrete coating station wherein concrete/aggregate is caused to impinge upon the rotating pipe thereby building up a thickness of concrete on the pipe to form a coating. The concrete coating can also be applied by other methods. However the pre- reatment of the pipe to resist corrosion affects the ability to retain a subsequently applied concrete coating in place effectively.
Accordingly this invention is directed at providing an effective anti-corrosion coating to which application of a concrete coating is facilitated.
Fusion Bonding Epoxy coating is thought by many people in the industry to be superior in many ways for the protection of carbon steel pipelines. Fusion Bonded Epoxy is a thin film coating typically 350 μm to 500 μm in thickness. It displays superior resistance to cathodic
disbonding in comparison to other conventional coatings currently commercially available. However, when being used for undersea use, it has proved difficult to get concrete weight coating to give the correct shear resistance over the epoxy film due to the latter's smooth nature.
A currently commercially successful method relies on aggregate embedded in a one metre band of a liquid epoxy coated after the parent coating has been applied. However this method requires the coating thickness of the epoxy to be elevated from a nominal 400 μm to 750 μm minimum and the cost increase is no longer commercially acceptable. Therefore it is an object of this invention to provide an equally effective method of providing shear resistance but at a reduced cost.
Thus according to this invention, a pipe is coated with fusion bonding epoxy (FBE) according to the known method, but to normal film thickness of about 350 μm to about 500 μm, and after application of the said epoxy a water- impermeable plastics adhesive e.g. a copolymer polypropylene based adhesive is applied by extrusion, and sintered particles are applied simultaneously e.g. by spraying, to provide a polypropylene copolymer coating thickness of about 500 μm. This provides a protective barrier over the entire surface of the FBE anti-corrosive layer which has good keying characteristics for the subsequent application of an anti-buoyancy coating.
The particle size of the sintered particles is not restricted but would conveniently lie in the range of about 150 μm to about 250 μm.
The water-impermeable plastics adhesive is applied immediately after epoxy coating e.g. by side extrusion onto the pipe as it exits from the epoxy coating booth to provide optimum control of the coating thickness . Such a polypropylene based adhesive is less expensive than epoxy resin and provides a means of incorporating sintered particles throughout the length of the pipe surface, thereby
providing both protective barrier coating and a shear - transfer key for the anti-buoyancy concrete coating.
The polypropylene barrier thus has a two fold benefit. Due to it exhibiting a low water vapour transition rate it enhances the performance of the epoxy base coat and the sintered polypropylene copolymer particles incorporated therein provide an anti-shear mechanism for the concrete which is applied later, again by any suitable concrete coating method known per se.
An apparatus for carrying out the coating method comprises means for conveying pipe to a coating station for applying an anti-corrosion coating e.g. epoxy, means for rotating the pipe during said coating, means for controlling the coating process to provide a coating in the range of from about 350 μm to about 500 μm, means for applying a plastics adhesive coating over the anti-corrosion coating and means for simultaneously applying sintered particles with the adhesive coating.
The invention will now be further described by way of example for the purposes of illustration only.
A suitably cleaned steel pipe is subjected to normal preheating (circa 232 - 260°C) and passed through an electrostatic powder spray booth wherein an epoxy powder resin is charged to the pipe surface to a controlled thickness in the range of 400 μm and cured. The pipe is immediately over-coated with a polypropylene copolymer adhesive from an extruder and during said over-coating step sintered polypropylene copolymer particles having a size distribution in the range of 150 μm to 250 μm are applied to provide a uniform coating up to 1 mm thick overall . The said sintered particles may suitably be obtained by grinding polypropylene copolymer raw material under cryogenic conditions. The polypropylene copolymer raw material is readily available commercially e.g. from Hoechst or Himont.
The pipe is thereafter passed to a concrete throwing station for application of an anti-buoyancy coating typically of from about 40 mm - 150 mm thick and having a density of 2645 kg/m based on Ilmenite. The concrete' coating density may be varied from 2165 to 3125 kg/m3 by choosing appropriate mixtures of cement, sand and iron ore.
Claims
1. A pipe having an anti-corrosion coating of epoxy resin having a film thickness of from about 350 μm to about 500 μm, and a protective coating of a polypropylene based copolymer applied over said anti-corrosion coating to a thickness of about 500 μm, said protective coating incorporating sintered particles.
2. A coated pipe according to claim 1 2 wherein the particle size of the sintered particles lies in the range of about 150 μm to about 250 μm.
3. A coated pipe according to either claim l or claim 2 wherein an anti-buoyancy coating is applied over the polypropylene copolymer sintered particles barrier coating.
4. A method of coating pipes comprising the steps of applying an epoxy resin to a substantially uniform film thickness of from about 350 μm to about 500 μm, and immediately thereafter applying a further coating of a polypropylene copolymer based adhesive over said epoxy coating, and applying therewith sintered particles to provide a substantially uniform barrier coating of polypropylene copolymer containing sintered particles, said barrier coating having a thickness of about 500 μm.
5. A method according to claim 4 wherein the polypropylene copolymer adhesive is extruded onto the epoxy resin coated pipe and the sintered particles are applied simultaneously thereto during the extrusion of the copolymer polypropylene adhesive coating.
6. An apparatus for carrying out the coating method claimed in claim 4 comprising means for conveying pipe to a coating station for applying an anti-corrosion epoxy resin coating, means for rotating the pipe during said coating, means for controlling the coating process to provide a resin coating in the range of from about 350 μm to about 500 μm, means for applying a plastics adhesive coating over the anti-corrosion coating and means for simultaneously applying sintered particles with the adhesive coating.
7. Apparatus according to claim 6 wherein the plastics > adhesive coating is extruded over the resin coated pipe and the sintered particles are simultaneously sprayed onto the extruded coating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB939309913A GB9309913D0 (en) | 1993-05-14 | 1993-05-14 | Pipe coating |
| GB9309913.3 | 1993-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994026426A1 true WO1994026426A1 (en) | 1994-11-24 |
Family
ID=10735443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1994/001020 WO1994026426A1 (en) | 1993-05-14 | 1994-05-12 | Pipe coating |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB9309913D0 (en) |
| WO (1) | WO1994026426A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2299145B (en) * | 1995-03-10 | 1998-12-09 | Bredero Price Services | Pipe coating |
| WO2002081105A1 (en) * | 2001-04-09 | 2002-10-17 | Bredero Price Coaters Limited | Pipe coating |
| CN112547465A (en) * | 2020-10-27 | 2021-03-26 | 吉林大学 | Spraying method of anticorrosive paint for outer surface of marine pipeline of ship |
| US11702915B2 (en) * | 2017-02-07 | 2023-07-18 | Equinor Energy As | Method and system for Co2 enhanced oil recovery |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1213977B (en) * | 1962-06-22 | 1966-04-07 | Phoenix Rheinrohr Ag | Polyethylene coating on metal surfaces resistant to stress cracks and a method for producing such a polyethylene coating |
| GB1542333A (en) * | 1977-11-18 | 1979-03-14 | British Steel Corp | Coating of pipes |
| FR2529829A1 (en) * | 1982-07-06 | 1984-01-13 | Mannesmann Ag | PROCESS FOR COATING METAL BODIES |
| EP0261343A2 (en) * | 1986-08-23 | 1988-03-30 | Blome GmbH & Co. Kommanditgesellschaft | Method of making profiling projections on steel objects coated with synthetic resins, and coated steel objects obtained |
| WO1990012657A1 (en) * | 1989-04-18 | 1990-11-01 | Du Pont Canada Inc. | Epoxy/polyolefin coating process |
-
1993
- 1993-05-14 GB GB939309913A patent/GB9309913D0/en active Pending
-
1994
- 1994-05-12 WO PCT/GB1994/001020 patent/WO1994026426A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1213977B (en) * | 1962-06-22 | 1966-04-07 | Phoenix Rheinrohr Ag | Polyethylene coating on metal surfaces resistant to stress cracks and a method for producing such a polyethylene coating |
| GB1542333A (en) * | 1977-11-18 | 1979-03-14 | British Steel Corp | Coating of pipes |
| FR2529829A1 (en) * | 1982-07-06 | 1984-01-13 | Mannesmann Ag | PROCESS FOR COATING METAL BODIES |
| EP0261343A2 (en) * | 1986-08-23 | 1988-03-30 | Blome GmbH & Co. Kommanditgesellschaft | Method of making profiling projections on steel objects coated with synthetic resins, and coated steel objects obtained |
| WO1990012657A1 (en) * | 1989-04-18 | 1990-11-01 | Du Pont Canada Inc. | Epoxy/polyolefin coating process |
Non-Patent Citations (1)
| Title |
|---|
| L.R AALUND: "Polypropylene system scores high as pipeline anti-corrosion coating", OIL AND GAS JOURNAL, vol. 90, no. 50, 14 December 1992 (1992-12-14), TULSA US, pages 42 - 45, XP000337029 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2299145B (en) * | 1995-03-10 | 1998-12-09 | Bredero Price Services | Pipe coating |
| WO2002081105A1 (en) * | 2001-04-09 | 2002-10-17 | Bredero Price Coaters Limited | Pipe coating |
| US11702915B2 (en) * | 2017-02-07 | 2023-07-18 | Equinor Energy As | Method and system for Co2 enhanced oil recovery |
| CN112547465A (en) * | 2020-10-27 | 2021-03-26 | 吉林大学 | Spraying method of anticorrosive paint for outer surface of marine pipeline of ship |
| CN112547465B (en) * | 2020-10-27 | 2021-12-28 | 吉林大学 | A spraying method for anti-corrosion paint on the outer surface of seawater pipelines of ships |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9309913D0 (en) | 1993-06-30 |
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