CA2971343A1 - An internal anticorrosive and abrasive resistant protection coating for steel pipes - Google Patents
An internal anticorrosive and abrasive resistant protection coating for steel pipes Download PDFInfo
- Publication number
- CA2971343A1 CA2971343A1 CA2971343A CA2971343A CA2971343A1 CA 2971343 A1 CA2971343 A1 CA 2971343A1 CA 2971343 A CA2971343 A CA 2971343A CA 2971343 A CA2971343 A CA 2971343A CA 2971343 A1 CA2971343 A1 CA 2971343A1
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- Prior art keywords
- layer
- coating
- epoxy resin
- applied directly
- directly onto
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- Abandoned
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 239000011248 coating agent Substances 0.000 title claims abstract description 33
- 230000004224 protection Effects 0.000 title claims description 7
- 239000003822 epoxy resin Substances 0.000 claims abstract description 40
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 40
- 239000000853 adhesive Substances 0.000 claims abstract description 29
- 230000001070 adhesive effect Effects 0.000 claims abstract description 29
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 23
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 23
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 229920000098 polyolefin Polymers 0.000 claims description 28
- 150000008064 anhydrides Chemical group 0.000 claims description 19
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 32
- 239000002253 acid Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- -1 polyethylene Polymers 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- PBLZLIFKVPJDCO-UHFFFAOYSA-N 12-aminododecanoic acid Chemical compound NCCCCCCCCCCCC(O)=O PBLZLIFKVPJDCO-UHFFFAOYSA-N 0.000 description 8
- 239000004593 Epoxy Substances 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005270 abrasive blasting Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229920006334 epoxy coating Polymers 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000012815 thermoplastic material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012412 chemical coupling Methods 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- 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
- 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
-
- 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
- B32B2250/02—2 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
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/554—Wear resistance
-
- 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
- B32B2307/558—Impact strength, toughness
-
- 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
- B32B2307/724—Permeability to gases, adsorption
-
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2597/00—Tubular articles, e.g. hoses, pipes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention includes an inner anticorrosive and abrasive resistant coating (10) for steel pipes (1) used for the transport of fluids.
The coating includes: a layer of epoxy resin (2) having free hydroxyl groups, which are applied directly to the inside 1 a of the steel pipe (1); a layer of thermoplastic adhesive (3) applied directly onto the layer of epoxy resin; and a layer of 12-Aminododecanoic acid lactam with the formula (C12H23NO), which is applied directly onto the layer of adhesive.
The coating includes: a layer of epoxy resin (2) having free hydroxyl groups, which are applied directly to the inside 1 a of the steel pipe (1); a layer of thermoplastic adhesive (3) applied directly onto the layer of epoxy resin; and a layer of 12-Aminododecanoic acid lactam with the formula (C12H23NO), which is applied directly onto the layer of adhesive.
Description
AN INTERNAL ANTICORROSIVE AND ABRASIVE RESISTANT
PROTECTION COATING FOR STEEL PIPES
FIELD OF THE INVENTION
The present invention is related to an internal anticorrosive and abrasive resistant protection coating for steel pipes.
BACKGROUND OF THE INVENTION
The world market offers a great variety of coating options to protect the inner surface of pipes used for the transport of fluids from the effects of corrosion and erosion. Some, additionally, exhibit features that allow the reduction of friction and turbulence, thus, increasing the efficiency of flow.
Among the alternatives to anticorrosive coatings, one can find those based on liquid epoxy;
the epoxy coating is adhered by fusion and the special anticorrosive paints.
Among the main features of these coatings, they exhibit adaptation to corrosive environments, resistance to various solvents and chemical products, as well as to cathodic detachment.
The research on inner coatings, along with the technical and metallurgic evolution required by pipes and accessories, has resulted in the development of coating that satisfies all kinds of needs.
A very common kind of coating is cement mortar lining, which fulfills the standards set forth in ISO 4179 and AWWA C104 for use in water distribution systems and sewerage systems. The ceramic epoxy coating for gravity-operated septic tanks and sewerage systems and the special inner coating for specific service conditions.
Inner cement lining is done by making the pipe rotate at high angular velocity coupled with vibration that produces a dense coating.
The high centrifugal speed allows the coating to become smooth, dense and perfectly compact.
The Hazen-Williams formula has determined that the coefficient of friction is 140 for cement linings and 150 for polyethylene and epoxy coatings.
Other anticorrosive and abrasive resistant protections consist in placing plastic liners inside the pipes. However, said liners are not adhered to the metal.
They are simply attached at the ends of the pipe to avoid displacement.
Prior art shows a steel pipe inner coating made of high-density consolidated polyethylene. Also, prior art shows a steel pipe with an insulating inner coating and a fiber-filled thermoplastic liner placed inside a steel pipe.
Besides, prior art shows an inner coating for pipes made up of a highly heat-resistant TPU-Polyester lining which allows a nonwoven fabric to be saturated with an epoxy-amine resin and to be cured with steam or hot water.
There is a coating made up of a solixane-based elastomer processable by heat fusion, a coating made of a thermoplastic material, and a thermoplastic coating applied to the inside of the pipe by injecting gas that pushes the material against the inner surface of the pipe.
Even though all the known coatings in the field of technique yield the desired results for their specific purpose, the known coatings do not, unfortunately, include a plastic coating that can strongly adhere to pipes, so that it can withstand pressure drops of the magnitudes present in oil and gas production pipelines.
Nor does prior art show a coating that can make pipes impermeable to liquids and gases simultaneously.
PROTECTION COATING FOR STEEL PIPES
FIELD OF THE INVENTION
The present invention is related to an internal anticorrosive and abrasive resistant protection coating for steel pipes.
BACKGROUND OF THE INVENTION
The world market offers a great variety of coating options to protect the inner surface of pipes used for the transport of fluids from the effects of corrosion and erosion. Some, additionally, exhibit features that allow the reduction of friction and turbulence, thus, increasing the efficiency of flow.
Among the alternatives to anticorrosive coatings, one can find those based on liquid epoxy;
the epoxy coating is adhered by fusion and the special anticorrosive paints.
Among the main features of these coatings, they exhibit adaptation to corrosive environments, resistance to various solvents and chemical products, as well as to cathodic detachment.
The research on inner coatings, along with the technical and metallurgic evolution required by pipes and accessories, has resulted in the development of coating that satisfies all kinds of needs.
A very common kind of coating is cement mortar lining, which fulfills the standards set forth in ISO 4179 and AWWA C104 for use in water distribution systems and sewerage systems. The ceramic epoxy coating for gravity-operated septic tanks and sewerage systems and the special inner coating for specific service conditions.
Inner cement lining is done by making the pipe rotate at high angular velocity coupled with vibration that produces a dense coating.
The high centrifugal speed allows the coating to become smooth, dense and perfectly compact.
The Hazen-Williams formula has determined that the coefficient of friction is 140 for cement linings and 150 for polyethylene and epoxy coatings.
Other anticorrosive and abrasive resistant protections consist in placing plastic liners inside the pipes. However, said liners are not adhered to the metal.
They are simply attached at the ends of the pipe to avoid displacement.
Prior art shows a steel pipe inner coating made of high-density consolidated polyethylene. Also, prior art shows a steel pipe with an insulating inner coating and a fiber-filled thermoplastic liner placed inside a steel pipe.
Besides, prior art shows an inner coating for pipes made up of a highly heat-resistant TPU-Polyester lining which allows a nonwoven fabric to be saturated with an epoxy-amine resin and to be cured with steam or hot water.
There is a coating made up of a solixane-based elastomer processable by heat fusion, a coating made of a thermoplastic material, and a thermoplastic coating applied to the inside of the pipe by injecting gas that pushes the material against the inner surface of the pipe.
Even though all the known coatings in the field of technique yield the desired results for their specific purpose, the known coatings do not, unfortunately, include a plastic coating that can strongly adhere to pipes, so that it can withstand pressure drops of the magnitudes present in oil and gas production pipelines.
Nor does prior art show a coating that can make pipes impermeable to liquids and gases simultaneously.
2 In addition to solving the previous points, the proposed invention also shows a yet-inexistent procedure in the prior art, whereby a layer of adhesive thermoplastic is applied between an epoxy adhesive and material of the plastic pipe so as to achieve a full adherence of the various components and steel of the metal pipe.
Finally, neither is there in the state of the art, and the invention does describe this, a procedure that includes a step whereby a plastic pipe is pressed against the surface of the steel pipe, while simultaneously applying heat at a temperature higher than the point of softening of the thermoplastic material, but without damaging the material.
SUMMARY OF INVENTION
It is an object of the present invention to have a thermoplastic coating that adheres to the inside of pipes with such strength that it will counteract the strength of pressure drops present in oil and gas production pipelines.
It is another object of the revealed procedure that the inner coating of the steel pipe is impermeable to the transported liquids and gases.
It is another object of the present invention to provide a layer of thermoplastic adhesive between the epoxy layer and the material of the plastic pipe.
It is also an object of the present documentation to have a procedure including the steps to press the plastic pipe against the wall of the metal pipe while simultaneously applying temperature.
Finally, it is an object of this invention to have a steel pipe lined with an inner plastic pipe, and between said pipes there is a layer of adhesive and a layer of epoxy.
Finally, neither is there in the state of the art, and the invention does describe this, a procedure that includes a step whereby a plastic pipe is pressed against the surface of the steel pipe, while simultaneously applying heat at a temperature higher than the point of softening of the thermoplastic material, but without damaging the material.
SUMMARY OF INVENTION
It is an object of the present invention to have a thermoplastic coating that adheres to the inside of pipes with such strength that it will counteract the strength of pressure drops present in oil and gas production pipelines.
It is another object of the revealed procedure that the inner coating of the steel pipe is impermeable to the transported liquids and gases.
It is another object of the present invention to provide a layer of thermoplastic adhesive between the epoxy layer and the material of the plastic pipe.
It is also an object of the present documentation to have a procedure including the steps to press the plastic pipe against the wall of the metal pipe while simultaneously applying temperature.
Finally, it is an object of this invention to have a steel pipe lined with an inner plastic pipe, and between said pipes there is a layer of adhesive and a layer of epoxy.
3 The present invention includes an anticorrosive and abrasive resistant inner coating for steel pipes used to transport fluids. The coating includes:
a layer of epoxy resin having free hydroxyl groups, which is applied directly to the inside wall of the steel pipe; a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin; and a layer of 12-Aminododecanoic acid lactam with the formula (C12H23N0), which is directly applied onto the adhesive layer.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 illustrates a cross section of the steel pipe 1, which includes the coating as described in the present invention;
Figure 2 shows a diagram which represents the chemical bonds formed through electron sharing by groups on the substrate and epoxy resin; and Figure 3 shows a diagram that represents the chemical structure of the thermoplastic adhesive of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
With the aim to make the present invention comprehensible so that it can be applied easily, a precise description of the preferred method for manufacturing will be presented in the following paragraphs. Said description includes a diagram illustrating the invention. Said description and diagram cannot be regarded in any way as limiting the invention. The components mentioned in the description can be selected among various equivalents, but without deviating from the principles of the invention set forth in the current documentation.
a layer of epoxy resin having free hydroxyl groups, which is applied directly to the inside wall of the steel pipe; a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin; and a layer of 12-Aminododecanoic acid lactam with the formula (C12H23N0), which is directly applied onto the adhesive layer.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 illustrates a cross section of the steel pipe 1, which includes the coating as described in the present invention;
Figure 2 shows a diagram which represents the chemical bonds formed through electron sharing by groups on the substrate and epoxy resin; and Figure 3 shows a diagram that represents the chemical structure of the thermoplastic adhesive of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
With the aim to make the present invention comprehensible so that it can be applied easily, a precise description of the preferred method for manufacturing will be presented in the following paragraphs. Said description includes a diagram illustrating the invention. Said description and diagram cannot be regarded in any way as limiting the invention. The components mentioned in the description can be selected among various equivalents, but without deviating from the principles of the invention set forth in the current documentation.
4 The present invention includes an inner anticorrosive and abrasive resistant coating for steel pipes used for the transport of fluids. The coating includes:
a layer of epoxy resin having free hydroxyl groups, which is applied .. directly to the inside of the steel pipe;
a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin;
and a layer of 12-Aminododecanoic acid lactam with the formula (012H23N0), which is directly applied onto the layer of adhesive.
Epoxy Resin The epoxy resin used in the present invention may be any resin that contains free hydroxyl groups.
The epoxy resin having free hydroxyl groups adheres to the metallic surface because of the chemical bonds formed through electron sharing by groups on the substrate and the free hydroxyl groups of the epoxy resin, the curing is accompanied by polarity change (See Fig 2).
It will be understood that the curing phenomenon of epoxy resin compositions involves chemical linking between polymer chains and that this linking (or "cross-linking") mechanism is initiated almost immediately upon application of the epoxy resin upon a hot surface and continues as the epoxy resin composition melts, coalesces and gels.
Examples of preferred epoxy resins having free hydroxyl groups useful in the present invention are Epoxy, Phenolic Epoxy, Polyurethane Epoxy, and/ or Novolac(R).
The thickness of the layer of epoxy resin is at least 30 microns, preferably between 30 and 250 microns.
a layer of epoxy resin having free hydroxyl groups, which is applied .. directly to the inside of the steel pipe;
a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin;
and a layer of 12-Aminododecanoic acid lactam with the formula (012H23N0), which is directly applied onto the layer of adhesive.
Epoxy Resin The epoxy resin used in the present invention may be any resin that contains free hydroxyl groups.
The epoxy resin having free hydroxyl groups adheres to the metallic surface because of the chemical bonds formed through electron sharing by groups on the substrate and the free hydroxyl groups of the epoxy resin, the curing is accompanied by polarity change (See Fig 2).
It will be understood that the curing phenomenon of epoxy resin compositions involves chemical linking between polymer chains and that this linking (or "cross-linking") mechanism is initiated almost immediately upon application of the epoxy resin upon a hot surface and continues as the epoxy resin composition melts, coalesces and gels.
Examples of preferred epoxy resins having free hydroxyl groups useful in the present invention are Epoxy, Phenolic Epoxy, Polyurethane Epoxy, and/ or Novolac(R).
The thickness of the layer of epoxy resin is at least 30 microns, preferably between 30 and 250 microns.
5 Thermoplastic adhesive In the preferred method for manufacturing described in the present documentation, the adhesive (3) is of the thermoplastic type and it allows a chemical bond with the epoxy of the first layer (2) so as to obtain full adherence to the metal.
The thermoplastic adhesive used in the present invention may be Anhydride modified polyolefin or acrylic acid modified polyolefin, since the epoxy resins have free hydroxyl groups anhydride or acrylic acid adhesive that can react to form very strong bonds to the epoxy (See Fig 3).
Epoxy resin combines very low permeability to oxygen with excellent adhesion to properly prepared metallic surfaces and excellent resistance to cathodic disbondment. However, it is permeable to moisture, and is easily damaged by mechanical impacts. It is therefore beneficial to cover the epoxy resin with a layer of a polymer that is highly resistant to moisture permeation and resistant to impact damage.
Polyolefin coatings are widely used to protect metal pipelines, especially oil and gas pipelines, from both corrosion and mechanical damage.
Unfortunately, the actual thermoplastic internal coating or polyolefins liners are not bonded to epoxy resin. The present invention uses modified polyolefins that contain polar groups to bond to the epoxy resin layer.
It is to be understood that the term "modified polyolefin", as used in the present invention, includes not only a polyolefin that is modified with an unsaturated carboxylic acid or an anhydride thereof, that is, a polyolefin copolymerized with the unsaturated carboxylic acid or the anhydride thereof, but also includes a blend of a polyolefin modified with the unsaturated carboxylic acid or anhydride thereof and an unmodified polyolefin.
The epoxy resin free hydroxyl-groups and the carboxylic acid dimer hydrogen bonding produces an epoxy resin¨anhydride system. The gelation phase of reaction exhibits rapid initial hydroxyl¨anhydride reactions.
The thermoplastic adhesive used in the present invention may be Anhydride modified polyolefin or acrylic acid modified polyolefin, since the epoxy resins have free hydroxyl groups anhydride or acrylic acid adhesive that can react to form very strong bonds to the epoxy (See Fig 3).
Epoxy resin combines very low permeability to oxygen with excellent adhesion to properly prepared metallic surfaces and excellent resistance to cathodic disbondment. However, it is permeable to moisture, and is easily damaged by mechanical impacts. It is therefore beneficial to cover the epoxy resin with a layer of a polymer that is highly resistant to moisture permeation and resistant to impact damage.
Polyolefin coatings are widely used to protect metal pipelines, especially oil and gas pipelines, from both corrosion and mechanical damage.
Unfortunately, the actual thermoplastic internal coating or polyolefins liners are not bonded to epoxy resin. The present invention uses modified polyolefins that contain polar groups to bond to the epoxy resin layer.
It is to be understood that the term "modified polyolefin", as used in the present invention, includes not only a polyolefin that is modified with an unsaturated carboxylic acid or an anhydride thereof, that is, a polyolefin copolymerized with the unsaturated carboxylic acid or the anhydride thereof, but also includes a blend of a polyolefin modified with the unsaturated carboxylic acid or anhydride thereof and an unmodified polyolefin.
The epoxy resin free hydroxyl-groups and the carboxylic acid dimer hydrogen bonding produces an epoxy resin¨anhydride system. The gelation phase of reaction exhibits rapid initial hydroxyl¨anhydride reactions.
6 The acid or anhydride modified polyolefins of the invention are, in most cases, acid or anhydride modified polyethylenes, polypropylenes, or combinations thereof. Most preferably the polyolefins of the invention are acid or anhydride modified polypropylenes, acid or anhydride modified polypropylene derivatives, or mixtures of these. The acid or anhydride modified polyolefin component of the invention may also be mixtures of acid or anhydride modified polyolefins with unmodified polyolefins. Preferably, if the emulsion comprises several polyolefins, most of the polyolefins have grafted thereto at least one acid or anhydride. The acids or anhydrides grafted on the polyolefins may be, in particular, ethylene-substituted carboxylic acids and/or polycarboxylic acids and/or acid anhydrides, such as, for example, maleic, acrylic, methacrylic, itaconic or citraconic acid (or anhydride). Most preferably the acid or anhydride modified polyolefins of the invention are maleic anhydride modified polypropylenes.
Examples of preferred acid or anhydride modified polyolefin dispersions useful in the present invention are maleic anhydride grafted polypropylene dispersions such as Hydrosize XM- 10075, Hydrosize PP2-01, Hydrosize PPI-01 (all from Hydrosize Technologies, Inc., Raleigh, NC) and Michem Emulsion 91735 (available from Michelman, Inc., Cincinnati, OH).
The thickness of the layer of the adhesive is at least 50 microns, preferably between 50 and 300.
12-Aminododecanoic acid lactam Onto the layer of thermoplastic adhesive (3) a fourth layer of plastic material is applied. This makes up the inner protection, which is very effective against abrasion and corrosion caused by fluids transported through steel pipes (1).
Preferably, examples thereof include 12-Aminododecanoic acid lactam with the formula (C12H23N0).
Examples of preferred acid or anhydride modified polyolefin dispersions useful in the present invention are maleic anhydride grafted polypropylene dispersions such as Hydrosize XM- 10075, Hydrosize PP2-01, Hydrosize PPI-01 (all from Hydrosize Technologies, Inc., Raleigh, NC) and Michem Emulsion 91735 (available from Michelman, Inc., Cincinnati, OH).
The thickness of the layer of the adhesive is at least 50 microns, preferably between 50 and 300.
12-Aminododecanoic acid lactam Onto the layer of thermoplastic adhesive (3) a fourth layer of plastic material is applied. This makes up the inner protection, which is very effective against abrasion and corrosion caused by fluids transported through steel pipes (1).
Preferably, examples thereof include 12-Aminododecanoic acid lactam with the formula (C12H23N0).
7 The lactam poly 12-aminododecanoic acid is fused plastically with the adhesive of the layer of thermoplastic material (3) and the layer of epoxy resin (2) achieving complete adhesion to the metal.
The 12-Aminododecanoic acid lactam is also known as 12-Aminododecanolactam; 1-Aza-2-cyclotridecanone; 12-Aminododecanoic acid lactam; 2-0xododecamethylenimine;
Azacyclotridecan-2-one;
Cyclododecalactam; Dodecalactam, Dodecanoic acid; 12-amino-, lactam;
Dodecanolactam; Dodecyllactam; Laurin lactam;Laurolactam; Lauryl lactam;
omega-Dodecalactam; Dodecane-12-lactam.
The 12-Aminododecanoic acid lactam has low moisture uptake, excellent ductility, good electrical properties, and significant chemical and impact resistance.
The amide groups (-CO-NH-) of the 12-Aminododecanoic acid lactam forms hydrogen bridge bonds between the chains of the macromolecules, thereby substantially promoting crystallinity and increasing their strength, and resistance to chemicals. 12-Aminododecanoic acid lactam1 has the lowest amide group concentration of all commercially available monomers, giving it the lowest moisture absorption and higher stability.
The 12-Aminododecanoic acid lactam1 has the following properties:
high mechanical strength, elasticity and surface hardness;
low water absorption and water vapor permeability;
low thermal conductivity; and good electrical insulation and dielectric strength.
The thickness of the layer of the 12-Aminododecanoic acid lactam1 is between 1 mm to 8mm.
The epoxy resin layer (2) is applied onto the inner surface (1a) of the steel pipe (1). Once the pipe has been burned (1) and later cleaned (abrasive blasting) with an abrasive material so as to eliminate contaminants, the inside surface (la) of the pipe (1) will be clean and ready for the epoxy resin (2) to be applied.
The 12-Aminododecanoic acid lactam is also known as 12-Aminododecanolactam; 1-Aza-2-cyclotridecanone; 12-Aminododecanoic acid lactam; 2-0xododecamethylenimine;
Azacyclotridecan-2-one;
Cyclododecalactam; Dodecalactam, Dodecanoic acid; 12-amino-, lactam;
Dodecanolactam; Dodecyllactam; Laurin lactam;Laurolactam; Lauryl lactam;
omega-Dodecalactam; Dodecane-12-lactam.
The 12-Aminododecanoic acid lactam has low moisture uptake, excellent ductility, good electrical properties, and significant chemical and impact resistance.
The amide groups (-CO-NH-) of the 12-Aminododecanoic acid lactam forms hydrogen bridge bonds between the chains of the macromolecules, thereby substantially promoting crystallinity and increasing their strength, and resistance to chemicals. 12-Aminododecanoic acid lactam1 has the lowest amide group concentration of all commercially available monomers, giving it the lowest moisture absorption and higher stability.
The 12-Aminododecanoic acid lactam1 has the following properties:
high mechanical strength, elasticity and surface hardness;
low water absorption and water vapor permeability;
low thermal conductivity; and good electrical insulation and dielectric strength.
The thickness of the layer of the 12-Aminododecanoic acid lactam1 is between 1 mm to 8mm.
The epoxy resin layer (2) is applied onto the inner surface (1a) of the steel pipe (1). Once the pipe has been burned (1) and later cleaned (abrasive blasting) with an abrasive material so as to eliminate contaminants, the inside surface (la) of the pipe (1) will be clean and ready for the epoxy resin (2) to be applied.
8 Before applying the epoxy resin (2), the steel pipe (1) will be burned. In the burn-off step the temperature must be controlled so as not to alter the metallographic conditions of the steel pipe (1). For this reason, the burn-off temperature must not exceed 350 C. This temperature will easily eliminate oils, grease, and fuel residues that might be covering inside of the steel pipe (1).
On the other hand, the applied temperature must not be lower than 100 C, since below that level the desired burn-off will not be achieved.
The abrasive blasting step seeks to prepare the inner surface of the steel pipe (1) by complementing the burn-off described in the previous step and, thus, improving the adherence of the epoxy resin (2). In the preferred method for manufacturing described, the abrasive blasting is done with non-contaminating material, preferably using 02A13 grit.
Then comes a heating step whereby the pipe (1) is heated at a temperature of between 120 C and 180 C, since this temperature improves the curing of the epoxy resin (2), which is applied at a later step before it completes its polymerization. In the preferred method for manufacturing in the present documentation, in the step where the steel pipe is heated, the heat is applied onto the exterior surface of said steel pipe (1).
The next step involves applying a layer of epoxy resin on the inner surface (1a) of the steel pipe (1). The epoxy resin can be applied in liquid, granular, or powder form.
Then a layer of thermoplastic adhesive (3) is applied directly onto the layer of the epoxy resin (2) while raising the temperature of the steel pipe, thus, achieving a chemical bond between said epoxy resin layer (2) and the thermoplastic adhesive layer (3). This makes the adhesive 3 come into close contact with the epoxy resin (2). Hence, in the step where temperature is raised, said epoxy resin (2) will be cured. The polymerization of the epoxy resin (2) and the fusion of the adhesive (3), which result from the step where temperature is raised to ensure a very strong chemical coupling, due to union of the carboxyl
On the other hand, the applied temperature must not be lower than 100 C, since below that level the desired burn-off will not be achieved.
The abrasive blasting step seeks to prepare the inner surface of the steel pipe (1) by complementing the burn-off described in the previous step and, thus, improving the adherence of the epoxy resin (2). In the preferred method for manufacturing described, the abrasive blasting is done with non-contaminating material, preferably using 02A13 grit.
Then comes a heating step whereby the pipe (1) is heated at a temperature of between 120 C and 180 C, since this temperature improves the curing of the epoxy resin (2), which is applied at a later step before it completes its polymerization. In the preferred method for manufacturing in the present documentation, in the step where the steel pipe is heated, the heat is applied onto the exterior surface of said steel pipe (1).
The next step involves applying a layer of epoxy resin on the inner surface (1a) of the steel pipe (1). The epoxy resin can be applied in liquid, granular, or powder form.
Then a layer of thermoplastic adhesive (3) is applied directly onto the layer of the epoxy resin (2) while raising the temperature of the steel pipe, thus, achieving a chemical bond between said epoxy resin layer (2) and the thermoplastic adhesive layer (3). This makes the adhesive 3 come into close contact with the epoxy resin (2). Hence, in the step where temperature is raised, said epoxy resin (2) will be cured. The polymerization of the epoxy resin (2) and the fusion of the adhesive (3), which result from the step where temperature is raised to ensure a very strong chemical coupling, due to union of the carboxyl
9 groups and the epoxy groups. As in the previous heating step, in the step where the temperature is raised, the steel pipe 1 is heated from the outside, so that in both cases the temperature reaches the inner surface 1a of said steel pipe (1) by conduction.
The temperature at which the steel pipe 1 is heated in the heating step depends on the thickness and diameter of the steel pipe 1. Of course, it is closely related to the composition and the temperature of the product that will be transported.
In the preferred method described in the present documentation, the temperature at which the steel pipe is heated ranges between 180 C and 350 C.
The layer of 12-Aminododecanoic acid lactam (4) is pressed against the layer of thermoplastic adhesive by injecting a fluid (gaseous or liquid) at high pressure into the pipe, while the steel pipe (1) is heated from the outside, thus, achieving the fusion between said adhesive and said plastic.
To determine the level of adherence to the metal, the inventors have conducted several trials following the CSA Standard Z 245.21-06 (Canadian Standard Association), Peel Adhesion (hanging mass) for System B1 : >15.3 Kg/25 mm, 20 C.
The level of adherence obtained is higher than 15.3 Kg/25 mm at a .. temperature of 20 C.
Through the tests conducted, it is determined that the set of three layers on the inner surface of the steel pipe (1) can withstand sharp pressure drops at temperatures ranging from -30 C to 110 C, in accordance to the prescribed values in the autoclave trial defined in the NACE TM0185 specification.
In compliance with the specification, it is subjected during 20 days to pressures of up to 273 atm and temperatures of up to 110 C. The fluids used in the trial were kerosene, toluene, and formation water with 12% CINa and gaseous phase CO2.
Above, this document describes one possible method to produce the invention and the way the invention works. Additionally, this documentation is supplemented with a summary of the invention contained in the claims that are added below.
The temperature at which the steel pipe 1 is heated in the heating step depends on the thickness and diameter of the steel pipe 1. Of course, it is closely related to the composition and the temperature of the product that will be transported.
In the preferred method described in the present documentation, the temperature at which the steel pipe is heated ranges between 180 C and 350 C.
The layer of 12-Aminododecanoic acid lactam (4) is pressed against the layer of thermoplastic adhesive by injecting a fluid (gaseous or liquid) at high pressure into the pipe, while the steel pipe (1) is heated from the outside, thus, achieving the fusion between said adhesive and said plastic.
To determine the level of adherence to the metal, the inventors have conducted several trials following the CSA Standard Z 245.21-06 (Canadian Standard Association), Peel Adhesion (hanging mass) for System B1 : >15.3 Kg/25 mm, 20 C.
The level of adherence obtained is higher than 15.3 Kg/25 mm at a .. temperature of 20 C.
Through the tests conducted, it is determined that the set of three layers on the inner surface of the steel pipe (1) can withstand sharp pressure drops at temperatures ranging from -30 C to 110 C, in accordance to the prescribed values in the autoclave trial defined in the NACE TM0185 specification.
In compliance with the specification, it is subjected during 20 days to pressures of up to 273 atm and temperatures of up to 110 C. The fluids used in the trial were kerosene, toluene, and formation water with 12% CINa and gaseous phase CO2.
Above, this document describes one possible method to produce the invention and the way the invention works. Additionally, this documentation is supplemented with a summary of the invention contained in the claims that are added below.
Claims (4)
1. An inner coating providing anticorrosive and abrasive resistant protection for steel pipes used for the transport of fluids, the coating includes:
a layer of epoxy resin having free hydroxyl groups applied directly onto the inner surface la of the steel pipe;
a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin; and a layer of 12-Aminododecanoic acid lactam whose formula is (C12H23NO), which is applied directly onto the layer of adhesive.
a layer of epoxy resin having free hydroxyl groups applied directly onto the inner surface la of the steel pipe;
a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin; and a layer of 12-Aminododecanoic acid lactam whose formula is (C12H23NO), which is applied directly onto the layer of adhesive.
2. The coating of claim 1, wherein the coating has a level of adherence higher than 15.3 Kg/25 mm at a temperature of 20°C, in accordance to CSA
Standard Z 245.21-06 (Canadian Standard Association), Peel Adhesion (hanging mass) for System B1 .
Standard Z 245.21-06 (Canadian Standard Association), Peel Adhesion (hanging mass) for System B1 .
3. The coating of claim 1, wherein it withstands sharp pressure drops at temperatures ranging from 30°C below zero to 110°C.
4. An internally lined steel pipe with an inner coating providing anticorrosion and abrasive resistant protection of the pipe, the coating includes:
a layer of epoxy resin having free hydroxyl groups applied directly onto the inner surface la of the steel pipe;
a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin; and a layer of 12-Aminododecanoic acid lactam whose formula is (C12H23N0), which is applied directly onto the layer of adhesive.
a layer of epoxy resin having free hydroxyl groups applied directly onto the inner surface la of the steel pipe;
a layer of thermoplastic adhesive applied directly onto the layer of epoxy resin, the thermoplastic adhesive is anhydride modified polyolefin or acrylic acid modified polyolefin; and a layer of 12-Aminododecanoic acid lactam whose formula is (C12H23N0), which is applied directly onto the layer of adhesive.
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CA2971343A CA2971343A1 (en) | 2017-06-19 | 2017-06-19 | An internal anticorrosive and abrasive resistant protection coating for steel pipes |
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CA2971343A CA2971343A1 (en) | 2017-06-19 | 2017-06-19 | An internal anticorrosive and abrasive resistant protection coating for steel pipes |
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Cited By (1)
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CN112657779A (en) * | 2020-12-15 | 2021-04-16 | 中建中新建设工程有限公司 | Automatic painting device and automatic painting method for anticorrosive coating on inner wall of welded steel pipe |
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2017
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112657779A (en) * | 2020-12-15 | 2021-04-16 | 中建中新建设工程有限公司 | Automatic painting device and automatic painting method for anticorrosive coating on inner wall of welded steel pipe |
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