GB2101499A - Coating pipes - Google Patents

Coating pipes Download PDF

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Publication number
GB2101499A
GB2101499A GB08218399A GB8218399A GB2101499A GB 2101499 A GB2101499 A GB 2101499A GB 08218399 A GB08218399 A GB 08218399A GB 8218399 A GB8218399 A GB 8218399A GB 2101499 A GB2101499 A GB 2101499A
Authority
GB
United Kingdom
Prior art keywords
coating
pipe
epoxy resin
adhesive layer
coated
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08218399A
Other versions
GB2101499B (en
Inventor
Douglas Thomas Mullen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BREDERO PRICE SERVICES
Original Assignee
BREDERO PRICE SERVICES
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 BREDERO PRICE SERVICES filed Critical BREDERO PRICE SERVICES
Priority to GB8218399A priority Critical patent/GB2101499B/en
Publication of GB2101499A publication Critical patent/GB2101499A/en
Application granted granted Critical
Publication of GB2101499B publication Critical patent/GB2101499B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F16L58/06—Coatings characterised by the materials used by cement, concrete, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • B05D7/146—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 to metallic pipes or tubes
    • 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
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A method of coating pipes for use in the construction of submerged pipelines comprises applying an anti- corrosion coating to the exterior surface of a pipe, applying an adhesive layer to a portion of the coated pipe, embedding an aggregate in the adhesive layer and applying a weight coating to the pipe. The aggregate counteracts the tendency of the weight coating to slip over the anti- corrosion coating during laying operations.

Description

SPECIFICATION Method of coating pipes This invention relates to coating of pipes used to construct submerged pipelines for carrying gas, oil and the like.
Such pipes are vulnerable to attack by the corrosive action of sea water which makes it desirable to provide a protective coating upon the pipe.
In addition, the natural buoyancy forces upon the pipe must be counteracted. Therefore, a negative buoyancy or weight coating must be overlaid on the anti-corrosion coating.
It has been found that creeping or slippage of the anti-corrosion coated pipe within the weight coating can occur during conventional pipe-laying operations.
Previous proposals for tackling this problem include coating the pipe with a plastic mastic like material and moulding a pattern into the material before hardening. On subsequent application of a cementitious weight coating the moulded pattern tends to resist slippage of the weight coating along the pipe.
An alternative proposal suggests that the pipe should be first coated with glass fibre/tar composite coating, then have a mechanical shear transfer device such as a spiral of wire or rings of lugs fixed to the coated pipe. Thereafter a concrete coating is applied which is held in place by the shear transfer device.
It is an object of the present invention to provide a simpler method of coating pipes whereby the problem of slippage between weight coating and anti-corrosion coating is obviated or mitigated.
According to the present invention there is provided a method of coating metallic pipes comprising applying an anti-corrosion coating to the exterior surface of a pipe, applying an adhesive layer to a portion of the coated pipe, embedding an aggregate in the adhesive layer and applying a weight coating to the pipe.
Preferably the anti-corrosion coating comprises a thermosetting resinous material which may be fusion bonded to the pipe. A powdered epoxy resin is particularly suitable for this purpose and may conveniently be applied by electrostatic spraying.
Preferably also the adhesive layer comprises a compatible thermosetting resin of the type obtainable commercially as a two-part epoxy resin or polyurethane resin which may contain further additives, such as paints.
A preferred embodiment of the invention will now be described by way of example with reference to the accompanying drawing which shows an end of a steel line pipe section, partially cut away to show coating layers.
EXAMPLE A steel pipe section 1 is subjected to preheating and cleaning by shot/grit blasting followed by automatic and manual grinding treatments and is finally vacuum cleaned to ensure a clean substrate for coating. The pipe is then heated to 450-50O0F (232-2600C) and passed through an electrostatic powder spray booth wherein an epoxy powder resin is charged to the pipe surface.
Curing of the resin commences immediately and is completed by passing the resin coated pipe to an infra-red post-cure station to provide an anticorrosion coating 2 on the steel pipe 1 having a thickness of from 16-25 thou (4.06-6.35 x 10-4 m).
The pipe may optionally be cooled at this stage to around 2000F (930C) to allow inspection and repair if necessary.
A quantity of a compatible epoxy resin is applied to a portion near each end of the pipe 1 to form an adhesive layer in the form of a band 3 around the pipe 1 having a width of 1 m and a thickness of about 20 thou (5 x 10-4 m). Gravel 4 is then embedded in the uncured band 3 of epoxy resin and thereafter curing is effected.
A suitable epoxy resin is conveniently obtained as a two-part epoxy resin presently commercially available.
The epoxy resin-coated pipe with cured bands of epoxy resin/gravel, which will be referred to as PRI-GRIP bands hereinafter, may then have a weight coating 5 applied. In this embodiment the weight coating is a reinforced steel cage/concrete coating 5.7-7.6 x 10-2 m thick of 2645 kg/m3 density based on Ilmenite. The density may be varied from 2165 to 3125 kg/m3 by choosing appropriate ratios of cement, sand and iron ore.
The concrete is then allowed to cure forming a coating giving the required negative buoyancy to restrain the pipeline against tidal effects.
The coated pipe section was subjected to pushoff tests which successfully proved the "PRI GRIP" band reduced creep or slippage between the anti-corrosion coating and the weight coating.
The strength and integrity of such a coating is sufficiently high to avoid the necessity of trenching the pipe line, thus a substantial saving in laying costs is obtained.
1. A method of coating metallic pipes comprising applying an anti-corrosion coating to the exterior surface of a pipe, applying an adhesive layer to a portion of the coated pipe, embedding an aggregate in the adhesive layer and applying a weight coating to the pipe.
2. A method according to claim 1 wherein the anti-corrosion coating comprises a thermosetting resinous material.
3. A method according to claim 2 wherein the thermosetting material is a powdered epoxy resin.
4. A method according to any one of claims 1 to 3 wherein the adhesive layer comprises a compatible thermosetting resin of the type obtainable commercially as a two-part epoxy resin or polyurethane resin.
5. A method of coating metallic pipes according
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of coating pipes This invention relates to coating of pipes used to construct submerged pipelines for carrying gas, oil and the like. Such pipes are vulnerable to attack by the corrosive action of sea water which makes it desirable to provide a protective coating upon the pipe. In addition, the natural buoyancy forces upon the pipe must be counteracted. Therefore, a negative buoyancy or weight coating must be overlaid on the anti-corrosion coating. It has been found that creeping or slippage of the anti-corrosion coated pipe within the weight coating can occur during conventional pipe-laying operations. Previous proposals for tackling this problem include coating the pipe with a plastic mastic like material and moulding a pattern into the material before hardening. On subsequent application of a cementitious weight coating the moulded pattern tends to resist slippage of the weight coating along the pipe. An alternative proposal suggests that the pipe should be first coated with glass fibre/tar composite coating, then have a mechanical shear transfer device such as a spiral of wire or rings of lugs fixed to the coated pipe. Thereafter a concrete coating is applied which is held in place by the shear transfer device. It is an object of the present invention to provide a simpler method of coating pipes whereby the problem of slippage between weight coating and anti-corrosion coating is obviated or mitigated. According to the present invention there is provided a method of coating metallic pipes comprising applying an anti-corrosion coating to the exterior surface of a pipe, applying an adhesive layer to a portion of the coated pipe, embedding an aggregate in the adhesive layer and applying a weight coating to the pipe. Preferably the anti-corrosion coating comprises a thermosetting resinous material which may be fusion bonded to the pipe. A powdered epoxy resin is particularly suitable for this purpose and may conveniently be applied by electrostatic spraying. Preferably also the adhesive layer comprises a compatible thermosetting resin of the type obtainable commercially as a two-part epoxy resin or polyurethane resin which may contain further additives, such as paints. A preferred embodiment of the invention will now be described by way of example with reference to the accompanying drawing which shows an end of a steel line pipe section, partially cut away to show coating layers. EXAMPLE A steel pipe section 1 is subjected to preheating and cleaning by shot/grit blasting followed by automatic and manual grinding treatments and is finally vacuum cleaned to ensure a clean substrate for coating. The pipe is then heated to 450-50O0F (232-2600C) and passed through an electrostatic powder spray booth wherein an epoxy powder resin is charged to the pipe surface. Curing of the resin commences immediately and is completed by passing the resin coated pipe to an infra-red post-cure station to provide an anticorrosion coating 2 on the steel pipe 1 having a thickness of from 16-25 thou (4.06-6.35 x 10-4 m). The pipe may optionally be cooled at this stage to around 2000F (930C) to allow inspection and repair if necessary. A quantity of a compatible epoxy resin is applied to a portion near each end of the pipe 1 to form an adhesive layer in the form of a band 3 around the pipe 1 having a width of 1 m and a thickness of about 20 thou (5 x 10-4 m). Gravel 4 is then embedded in the uncured band 3 of epoxy resin and thereafter curing is effected. A suitable epoxy resin is conveniently obtained as a two-part epoxy resin presently commercially available. The epoxy resin-coated pipe with cured bands of epoxy resin/gravel, which will be referred to as PRI-GRIP bands hereinafter, may then have a weight coating 5 applied. In this embodiment the weight coating is a reinforced steel cage/concrete coating 5.7-7.6 x 10-2 m thick of 2645 kg/m3 density based on Ilmenite. The density may be varied from 2165 to 3125 kg/m3 by choosing appropriate ratios of cement, sand and iron ore. The concrete is then allowed to cure forming a coating giving the required negative buoyancy to restrain the pipeline against tidal effects. The coated pipe section was subjected to pushoff tests which successfully proved the "PRI GRIP" band reduced creep or slippage between the anti-corrosion coating and the weight coating. The strength and integrity of such a coating is sufficiently high to avoid the necessity of trenching the pipe line, thus a substantial saving in laying costs is obtained. CLAIMS
1. A method of coating metallic pipes comprising applying an anti-corrosion coating to the exterior surface of a pipe, applying an adhesive layer to a portion of the coated pipe, embedding an aggregate in the adhesive layer and applying a weight coating to the pipe.
2. A method according to claim 1 wherein the anti-corrosion coating comprises a thermosetting resinous material.
3. A method according to claim 2 wherein the thermosetting material is a powdered epoxy resin.
4. A method according to any one of claims 1 to 3 wherein the adhesive layer comprises a compatible thermosetting resin of the type obtainable commercially as a two-part epoxy resin or polyurethane resin.
5. A method of coating metallic pipes according to claim 1 and substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
6. A pipe whenever coated by a method according to any one of the preceding claims.
GB8218399A 1981-06-25 1982-06-25 Coating pipes Expired GB2101499B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8218399A GB2101499B (en) 1981-06-25 1982-06-25 Coating pipes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8119656 1981-06-25
GB8218399A GB2101499B (en) 1981-06-25 1982-06-25 Coating pipes

Publications (2)

Publication Number Publication Date
GB2101499A true GB2101499A (en) 1983-01-19
GB2101499B GB2101499B (en) 1984-06-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8218399A Expired GB2101499B (en) 1981-06-25 1982-06-25 Coating pipes

Country Status (1)

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GB (1) GB2101499B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0238901A2 (en) * 1986-03-07 1987-09-30 ECI- European Chemical Industries Ltd. Metal pipe, in particular steel pipe, having an anticorrosive and a protective lining

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0238901A2 (en) * 1986-03-07 1987-09-30 ECI- European Chemical Industries Ltd. Metal pipe, in particular steel pipe, having an anticorrosive and a protective lining
EP0238901A3 (en) * 1986-03-07 1988-07-06 Eci- European Chemical Industries Ltd. Metal pipe, in particular steel pipe, having an anticorrosive and a protective lining

Also Published As

Publication number Publication date
GB2101499B (en) 1984-06-27

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 20020624