CA2121855A1 - Metallic pipe corrosion and stress resistant coating - Google Patents
Metallic pipe corrosion and stress resistant coatingInfo
- Publication number
- CA2121855A1 CA2121855A1 CA002121855A CA2121855A CA2121855A1 CA 2121855 A1 CA2121855 A1 CA 2121855A1 CA 002121855 A CA002121855 A CA 002121855A CA 2121855 A CA2121855 A CA 2121855A CA 2121855 A1 CA2121855 A1 CA 2121855A1
- Authority
- CA
- Canada
- Prior art keywords
- layer
- coating
- melt
- hot
- mils
- 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
Links
- 239000011248 coating agent Substances 0.000 title claims abstract 23
- 238000000576 coating method Methods 0.000 title claims abstract 23
- 238000005260 corrosion Methods 0.000 title claims abstract 5
- 230000007797 corrosion Effects 0.000 title claims abstract 5
- 230000001070 adhesive effect Effects 0.000 claims abstract 17
- 239000000853 adhesive Substances 0.000 claims abstract 16
- 239000012943 hotmelt Substances 0.000 claims abstract 14
- 239000000463 material Substances 0.000 claims abstract 13
- 229920000098 polyolefin Polymers 0.000 claims abstract 11
- 229920001971 elastomer Polymers 0.000 claims abstract 8
- 239000000203 mixture Substances 0.000 claims abstract 8
- 238000000034 method Methods 0.000 claims abstract 7
- 229920001577 copolymer Polymers 0.000 claims abstract 4
- 239000000806 elastomer Substances 0.000 claims abstract 4
- 239000000945 filler Substances 0.000 claims abstract 4
- 230000000704 physical effect Effects 0.000 claims abstract 4
- 229920000642 polymer Polymers 0.000 claims abstract 4
- 229920005989 resin Polymers 0.000 claims abstract 4
- 239000011347 resin Substances 0.000 claims abstract 4
- 239000005060 rubber Substances 0.000 claims abstract 4
- 239000002689 soil Substances 0.000 claims abstract 4
- 238000002844 melting Methods 0.000 claims abstract 2
- 230000008018 melting Effects 0.000 claims abstract 2
- 239000004698 Polyethylene Substances 0.000 claims 5
- -1 polyethylene Polymers 0.000 claims 5
- 229920000573 polyethylene Polymers 0.000 claims 5
- 238000005336 cracking Methods 0.000 claims 1
- 238000009863 impact test Methods 0.000 claims 1
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
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
- B29C65/54—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive between pre-assembled parts
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- 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
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
-
- 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
-
- 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
-
- 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-disconnectible pipe joints
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention provides a coating for metallic pipes having improved corrosion and soil stress resistance, and adapted for both in-the-mill and over-the-ditch application to said pipes, which coating comprises:a first layer comprising a hot-melt rubberized adhesive applied to the outer surface of a pipe preheated to a temperature of 25°-60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties: Ring and Ball softening temperature : 75° -95°C. Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm. Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer applied over the first layer, said second layer comprising a polyolefin material. Also described herein is a method for applying such coating to a metallic pipe surface. The pipe surface is first cleaned and the pipe is then preheated to a temperature of 25 - 60°C; then hot-melt rubberized adhesive, heated to a temperature above its melting point, is applied to the preheated pipe as a first layer, and immediately thereafter a second layer comprising a polyolefin material, preferably in the form of a tape, is applied over the first layer. The pipeline coating of the present invention is especially suitable for pipeline rehabilitation.
Claims (17)
1. An in-the-mill or over-the-ditch method for coating a metallic pipe to impart improved corrosion and soil stress resistance thereto, which comprises: preheating said pipe to a temperature of 25°-60°C, applying to said preheated pipe a first layer comprising a hot-melt rubberized adhesive preheated to a temperature above its melting point, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature: 75°-95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12mm Viscosity at 175°C : 10,000 - 100,000 cPs; and then applying over said first layer, for mechanical stress resistance, a second layer comprising a polyolefin material.
Ring and Ball softening temperature: 75°-95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12mm Viscosity at 175°C : 10,000 - 100,000 cPs; and then applying over said first layer, for mechanical stress resistance, a second layer comprising a polyolefin material.
2. A method according to claim 1 wherein the pipe is preheated to a temperature of 45 - 60°C.
3. The method of claim 1, wherein the first layer forms a continuous coating from 0.25 mm to 0.5 mm (10 to 20 mils) in thickness and the second layer forms a coating at least 0.89 mm (35 mils) in thickness.
4. The method of claim 3, wherein the second layer is applied by spirally wrapping a tape of polyolefin material over the first layer.
5. The method of claim 4, wherein the polyolefin material is polyethylene.
6. A coating for metallic pipes having improved corrosion and soil stress resistance, and adapted for both in-the-mill and over-the-ditch application to said pipes, which coating comprises:
a first layer comprising a hot-melt rubberized adhesive applied to the outer surface of a pipe preheated to a temperature of 25°-60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature : 75° - 95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer applied over the first layer, said second layer comprising a polyolefin material.
a first layer comprising a hot-melt rubberized adhesive applied to the outer surface of a pipe preheated to a temperature of 25°-60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature : 75° - 95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer applied over the first layer, said second layer comprising a polyolefin material.
7. The coating of claim 6, wherein the first layer forms a continuous coating from 0.25 mm to 0.5 mm (10 mils to 20 mils) in thickness and the second layer forms a coating at least 0.89 mm (35 mils) in thickness.
8. The coating of claim 7, wherein the second layer is a tape of polyolefin material, spirally wrapped over the first layer.
9. The coating of claim 8, wherein said polyolefin is polyethylene.
10. A coated metallic pipe having an improved corrosion and soil stress resistance coating, said coating comprising:
a first layer comprising a hot-melt rubberized adhesive, applied to the outer surface of a pipe preheated to a temperature of from 25° to 60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature: 75° - 95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer comprising a polyolefin material applied over the first layer.
a first layer comprising a hot-melt rubberized adhesive, applied to the outer surface of a pipe preheated to a temperature of from 25° to 60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature: 75° - 95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer comprising a polyolefin material applied over the first layer.
11. A coated metallic pipe of claim 10, wherein the first layer forms a continuous coating from 0.25 mm to 0.5 mm (10 mils to 20 mils) in thickness and the second layer forms a coating at least 0.89 mm (35 mils) in thickness.
12. A coated metallic pipe of claim 11, wherein the second layer is a tape of polyolefin material, spirally wrapped over the first layer.
13. A coated metallic pipe of claim 12, wherein said polyolefin is polyethylene.
14. A coating according to claim 6 which has the following properties:
Adhesive Properties:
Softening Point (ring and ball) . . . . 85°C average Adhesive Flow Test (71°C, 1 h) . . . . 2 - 8 mm average Coating Properties:
Peel Adhesion at 23°C (Instron) Cross head speed 10 mm/minute . . 3.5kg/25mm average Peel Adhesion (hanging weight, per CSA Z245.21) 2.0 kg . . . . . . . . . . . . . . 5mm/min/25mm 2.5 kg . . . . . . . . . . . . . . 7mm/min/25mm 3.0 kg . . . . . . . . . . . . . . 10mm/min/25mm 3.5 kg . . . . . . . . . . . . . . 15mm/min/25mm Cathodic Disbondment (CSA Z.245.21) 28 days, 23°C, 1.5V . . . . . . . 10 mm Radius 14 days, 65°C, 1.5V . . . . . . . 8 mm Radius 48 hour, 65°C, 1.5V . . . . . . . 6 mm Radius Impact Test, 23°C . . . . . . . . . . . 4.0 J/mm Bend Test, CSA Z.245.21 . . . . . . . . No cracking Outdoor Exposure (ASTM B-53) . . . . . 2 years min.
Polyethylene Tensile strength . . . . . 12 MPa Polyethyleno Tape Elongation . . . . . 200%
Minimum coating thickness in millimetres (mils):
Diameter (in): 3 - 8 10 and up (mm): 89 - 219 273 and up Adhesive: 0.25 (10) 0 30 (12) Polyethylene:
one layer 0.89 (35 mils) 0.89 (35 mils)
Adhesive Properties:
Softening Point (ring and ball) . . . . 85°C average Adhesive Flow Test (71°C, 1 h) . . . . 2 - 8 mm average Coating Properties:
Peel Adhesion at 23°C (Instron) Cross head speed 10 mm/minute . . 3.5kg/25mm average Peel Adhesion (hanging weight, per CSA Z245.21) 2.0 kg . . . . . . . . . . . . . . 5mm/min/25mm 2.5 kg . . . . . . . . . . . . . . 7mm/min/25mm 3.0 kg . . . . . . . . . . . . . . 10mm/min/25mm 3.5 kg . . . . . . . . . . . . . . 15mm/min/25mm Cathodic Disbondment (CSA Z.245.21) 28 days, 23°C, 1.5V . . . . . . . 10 mm Radius 14 days, 65°C, 1.5V . . . . . . . 8 mm Radius 48 hour, 65°C, 1.5V . . . . . . . 6 mm Radius Impact Test, 23°C . . . . . . . . . . . 4.0 J/mm Bend Test, CSA Z.245.21 . . . . . . . . No cracking Outdoor Exposure (ASTM B-53) . . . . . 2 years min.
Polyethylene Tensile strength . . . . . 12 MPa Polyethyleno Tape Elongation . . . . . 200%
Minimum coating thickness in millimetres (mils):
Diameter (in): 3 - 8 10 and up (mm): 89 - 219 273 and up Adhesive: 0.25 (10) 0 30 (12) Polyethylene:
one layer 0.89 (35 mils) 0.89 (35 mils)
15. A method according to claim 1 wherein the hot-melt rubberized adhesive is preheated to a temperature of 150° -175°C.
16. A coating according to claim 6 wherein the second layer has a minimum thickness of 0.6 mm.
17. A coated metallic pipe according to claim 10 wherein the second layer has a minimum thickness of 0.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2121855A CA2121855C (en) | 1994-04-21 | 1994-04-21 | Metallic pipe corrosion and stress resistant coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2121855A CA2121855C (en) | 1994-04-21 | 1994-04-21 | Metallic pipe corrosion and stress resistant coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2121855A1 true CA2121855A1 (en) | 1995-10-22 |
| CA2121855C CA2121855C (en) | 2010-12-21 |
Family
ID=4153429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2121855A Expired - Lifetime CA2121855C (en) | 1994-04-21 | 1994-04-21 | Metallic pipe corrosion and stress resistant coating |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2121855C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2743330A1 (en) * | 1996-01-10 | 1997-07-11 | Atochem Elf Sa | COATING OF METAL SURFACES |
-
1994
- 1994-04-21 CA CA2121855A patent/CA2121855C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2743330A1 (en) * | 1996-01-10 | 1997-07-11 | Atochem Elf Sa | COATING OF METAL SURFACES |
| WO1997025202A1 (en) * | 1996-01-10 | 1997-07-17 | Elf Atochem S.A. | Coating of metal surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2121855C (en) | 2010-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20140422 |