CA1192795A - Pipeline wrapping material - Google Patents
Pipeline wrapping materialInfo
- Publication number
- CA1192795A CA1192795A CA000363577A CA363577A CA1192795A CA 1192795 A CA1192795 A CA 1192795A CA 000363577 A CA000363577 A CA 000363577A CA 363577 A CA363577 A CA 363577A CA 1192795 A CA1192795 A CA 1192795A
- Authority
- CA
- Canada
- Prior art keywords
- material according
- compound
- perforations
- film
- polymeric film
- 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.)
- Expired
Links
Landscapes
- Laminated Bodies (AREA)
Abstract
ABSTRACT
PIPELINE WRAPPING MATERIAL
A pipeline wrapping material comprises a layer of a thermosetting compound on a perforated plastics film.
The compound is squeezed through the perforations at least at the time of application to a pipe so that the film is secured by protruding part of the compound.
PIPELINE WRAPPING MATERIAL
A pipeline wrapping material comprises a layer of a thermosetting compound on a perforated plastics film.
The compound is squeezed through the perforations at least at the time of application to a pipe so that the film is secured by protruding part of the compound.
Description
~927~
DESCRIPTION
TI TL~:
PIPEL,INE WRAPPING MATERIAL
This invention relates to a strip or sheet like product useful as a pipeline ~rapping material for protecting pipes, particularly although not exclusively, hot pipes.
There are numerous situations in which pipelines requireprotection from the elements, from subterranean hazards or, as the case may be, submarine hazards, and from corrosive influences. Further, pipes for conducting oil from oil wells, whether submarine or not, are 10 frequently hot, because the oil itself is hot.
Equally, if a crude oil is "waxy" it needs to be heated in order to be economicall~ pumped. In the case of natural gas, pipelines often have spaced apart booster stations to increase the pressure, and the pressure 15 increas~s lead to corresponding temperature imcreases so that in the region of such stations the pipes are hot.
Thermo~lastic self adhesive tapes are known for the wrapping of pipelines, but are unsatisfactory for 20 pipelines operating at elevated temperatures, for instance 80-220C, because the adhesive becomes soft 7~
and plastic and the protection impaired. Thus at t~e present time the temperatures prevailing at the surface of hot pipelines cause problems in applying to them and main-taining on them appropriate protective coverings.
According to the invention there is provided a pipe-line wrapping material comprising a layer of a thermosetting compound on a perforated polymeric film, wherein said thermo-setting compound extends through the perforations in said polymeric film and said thermosetting compound layer has a thickness of from Q.125 mm to 1.5 mm.
The thermosetting compound will preferably be self adhesive at ambient temperature, that is to say it will be adherent to a steel or concrete pipeline surface when applied manually.
If the material is applied to a pipe which is or becomes hot, the therrnosetting compound will shortly cure as a result of the heat of the pipe and be ahle to withstand temperatures up to 220C. Preferably the thermosetting com-pound is also such that if applied to an unheated pipeline, it will, for instance in about six months, still cure to a thermo-set condition at ambient temperatures in temperate zones.
The polymeric film is primarily for -the purpose of acting as a carrier for the thermosetting compound so that the product can be actory made and thus uniform, leading to a uniform application of protecting material on the pipeline.
The reason for the perforations is to increase security of ,~f ~
. A~
~g~7~s adhesion between the film and thermoset-ting compound, both before curing and afterwards where, as a secondary function, the film itself imparts protection and reinforcement. The compound :is forced throuyh -the perforations so that to some extent the film can be regarded as embedded therein. ~fter settiny, the compound which has been forced through usually adopts a "mushroom head" configuration, thus effectively "rive-tting" the film ;n place.
Normally, the material will be applied to a pipe by helical wrapping, and at least some overlap between adjacent turns will be provided. In this way the compound forced through the perforations in one layer of wrapping will contact the main layer of compound on the overwrap, so that the poly-meric film will be truly embedded, and the resulting protection will be much improved given the problems normally encountered in attempting to effect adhesionl at high temperature, between for instance a polypropylene or polyester film and a cured thermosetting compound.
A plastics film, preferably of polypropylene, or polyester is preferable for supporting the compound and pro-viding reinforcement on the pipe. The preferred thickness of this film which could be of other suita~le materials, is in the range la to 20Q microns, most preferably about 50 to lO0 microns. The perfora-tions should be small and numerous, there being prefera~ly between 3 to 30 perforations per squaxe centimetre and most preferably 9 to 18 per square J
,.. ..
7~S
centimetre. The perforations together preferably provide an open area in the polymeric film of not more than 40~, and most prefera~ly between 5 and 20o~
Various thermosetting resins can be used for the compound, but the compound is preferabl~ essen-tially epichlor-hydrin based, including secondary materials to allow flexi-bility in both the green and cured s-tates. The layer of compound desirably has a thickness of 0.5 to 1.0 mm.
Although It is expected to provide a layer of the thermosetting compound on only one side of the polymeric film, it is within the scope of the invention to provide such a layer on both sides, in which case of course, compound will be forced through the perforations so as to secure both layers to the film.
The material will normally be supplied in rolls, in strip or sheet like form, for instance in a width of 4 to 6 ins, or up to or even exceeding 1 metre. In such cases, a release sheet will be provided at least on the surface of the compound layer remote "~"' '~
7~5 from the polymeric film, and prefelably on both si~es of the material. Such sheets will ~e between adj~cent layers in the roll and the pressure of the roll will bring about the flow of the compound through the perforations in the film even before application to a pipeO
A siliconised, waxed or pvc coated paper will be preferable for the release sheet, though certain plastics materials offering little adhesion with the 10 compound may alternatively be used. Upon application to a pipe, the release sheet or sheets will be peeled off as the material is unrolled.
It is important to the invention that the thermosetting compound should be such that it will not 15 self cure too soon J for instance in temperate zones for a period of at least six months, but that it will appropriately cure upon the application of heat, such that curing will be brought about when a material is wrapped around a hot pipe. Even on a non-heated pipe, 20 as mentioned, curing will occur eventually so that the material is useful without regard to the heating or otherwise of ~he pipe.
Figure 1 of the accompanying drawings is a perspective view of a strip of material of the invention the 25 thicknesses of the different components of which ~re much exaggerated for clarity~ The strip comprises an upperrnost perforated plastics poLypropyLene film 10 on one face of which is suppor-ted a thermosetting compound layer.
On the free face of layer 11 is a siliconised release paper sheet 12. ~his material is to be supplied in rolls so that the release paper will contact the surface of the plastics film remote from the thermosetting resin in the preceding turn on the roll. ~lthough not shown, a release sheet i5 preferably 10 pxovided on each side of the material. While the material is in the roll, the thermosetting compound will be forced through the perforations in the plastics film 10 and form "pimples" upon the other side thereof.
Figure 2 schematically illus-trates a pipe 20, to 15 convey a flowable substance such as oil or natural gas which may be hot, and wrapped around which is a strip 21 of the material of the invention. It will be seen that the material is so wrapped that at any point on the pipe there are two layers of the material, thus 20 allowing the previously mentioned pimples of compGund on the lower wrap to engage with the layer 12 on the next overwrapO
DESCRIPTION
TI TL~:
PIPEL,INE WRAPPING MATERIAL
This invention relates to a strip or sheet like product useful as a pipeline ~rapping material for protecting pipes, particularly although not exclusively, hot pipes.
There are numerous situations in which pipelines requireprotection from the elements, from subterranean hazards or, as the case may be, submarine hazards, and from corrosive influences. Further, pipes for conducting oil from oil wells, whether submarine or not, are 10 frequently hot, because the oil itself is hot.
Equally, if a crude oil is "waxy" it needs to be heated in order to be economicall~ pumped. In the case of natural gas, pipelines often have spaced apart booster stations to increase the pressure, and the pressure 15 increas~s lead to corresponding temperature imcreases so that in the region of such stations the pipes are hot.
Thermo~lastic self adhesive tapes are known for the wrapping of pipelines, but are unsatisfactory for 20 pipelines operating at elevated temperatures, for instance 80-220C, because the adhesive becomes soft 7~
and plastic and the protection impaired. Thus at t~e present time the temperatures prevailing at the surface of hot pipelines cause problems in applying to them and main-taining on them appropriate protective coverings.
According to the invention there is provided a pipe-line wrapping material comprising a layer of a thermosetting compound on a perforated polymeric film, wherein said thermo-setting compound extends through the perforations in said polymeric film and said thermosetting compound layer has a thickness of from Q.125 mm to 1.5 mm.
The thermosetting compound will preferably be self adhesive at ambient temperature, that is to say it will be adherent to a steel or concrete pipeline surface when applied manually.
If the material is applied to a pipe which is or becomes hot, the therrnosetting compound will shortly cure as a result of the heat of the pipe and be ahle to withstand temperatures up to 220C. Preferably the thermosetting com-pound is also such that if applied to an unheated pipeline, it will, for instance in about six months, still cure to a thermo-set condition at ambient temperatures in temperate zones.
The polymeric film is primarily for -the purpose of acting as a carrier for the thermosetting compound so that the product can be actory made and thus uniform, leading to a uniform application of protecting material on the pipeline.
The reason for the perforations is to increase security of ,~f ~
. A~
~g~7~s adhesion between the film and thermoset-ting compound, both before curing and afterwards where, as a secondary function, the film itself imparts protection and reinforcement. The compound :is forced throuyh -the perforations so that to some extent the film can be regarded as embedded therein. ~fter settiny, the compound which has been forced through usually adopts a "mushroom head" configuration, thus effectively "rive-tting" the film ;n place.
Normally, the material will be applied to a pipe by helical wrapping, and at least some overlap between adjacent turns will be provided. In this way the compound forced through the perforations in one layer of wrapping will contact the main layer of compound on the overwrap, so that the poly-meric film will be truly embedded, and the resulting protection will be much improved given the problems normally encountered in attempting to effect adhesionl at high temperature, between for instance a polypropylene or polyester film and a cured thermosetting compound.
A plastics film, preferably of polypropylene, or polyester is preferable for supporting the compound and pro-viding reinforcement on the pipe. The preferred thickness of this film which could be of other suita~le materials, is in the range la to 20Q microns, most preferably about 50 to lO0 microns. The perfora-tions should be small and numerous, there being prefera~ly between 3 to 30 perforations per squaxe centimetre and most preferably 9 to 18 per square J
,.. ..
7~S
centimetre. The perforations together preferably provide an open area in the polymeric film of not more than 40~, and most prefera~ly between 5 and 20o~
Various thermosetting resins can be used for the compound, but the compound is preferabl~ essen-tially epichlor-hydrin based, including secondary materials to allow flexi-bility in both the green and cured s-tates. The layer of compound desirably has a thickness of 0.5 to 1.0 mm.
Although It is expected to provide a layer of the thermosetting compound on only one side of the polymeric film, it is within the scope of the invention to provide such a layer on both sides, in which case of course, compound will be forced through the perforations so as to secure both layers to the film.
The material will normally be supplied in rolls, in strip or sheet like form, for instance in a width of 4 to 6 ins, or up to or even exceeding 1 metre. In such cases, a release sheet will be provided at least on the surface of the compound layer remote "~"' '~
7~5 from the polymeric film, and prefelably on both si~es of the material. Such sheets will ~e between adj~cent layers in the roll and the pressure of the roll will bring about the flow of the compound through the perforations in the film even before application to a pipeO
A siliconised, waxed or pvc coated paper will be preferable for the release sheet, though certain plastics materials offering little adhesion with the 10 compound may alternatively be used. Upon application to a pipe, the release sheet or sheets will be peeled off as the material is unrolled.
It is important to the invention that the thermosetting compound should be such that it will not 15 self cure too soon J for instance in temperate zones for a period of at least six months, but that it will appropriately cure upon the application of heat, such that curing will be brought about when a material is wrapped around a hot pipe. Even on a non-heated pipe, 20 as mentioned, curing will occur eventually so that the material is useful without regard to the heating or otherwise of ~he pipe.
Figure 1 of the accompanying drawings is a perspective view of a strip of material of the invention the 25 thicknesses of the different components of which ~re much exaggerated for clarity~ The strip comprises an upperrnost perforated plastics poLypropyLene film 10 on one face of which is suppor-ted a thermosetting compound layer.
On the free face of layer 11 is a siliconised release paper sheet 12. ~his material is to be supplied in rolls so that the release paper will contact the surface of the plastics film remote from the thermosetting resin in the preceding turn on the roll. ~lthough not shown, a release sheet i5 preferably 10 pxovided on each side of the material. While the material is in the roll, the thermosetting compound will be forced through the perforations in the plastics film 10 and form "pimples" upon the other side thereof.
Figure 2 schematically illus-trates a pipe 20, to 15 convey a flowable substance such as oil or natural gas which may be hot, and wrapped around which is a strip 21 of the material of the invention. It will be seen that the material is so wrapped that at any point on the pipe there are two layers of the material, thus 20 allowing the previously mentioned pimples of compGund on the lower wrap to engage with the layer 12 on the next overwrapO
Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A pipeline wrapping material comprising a layer of a thermosetting compound on a perforated polymeric film, wherein said thermosetting compound extends through the perforations in said polymeric film and said thermosetting compound layer has a thickness of from 0.125 mm to 1.5 mm.
2. A material according to Claim 1, wherein the compound is self adhesive at room temperature.
3. A material according to Claim 1, wherein the compound will cure in unheated conditions in about 6 months.
4. A material according to Claim 1, wherein the film is of a plastics material.
5. A material according to Claim 4, wherein the film is of polypropylene or polyester.
6. A material according to Claim 4, wherein said plastics material has 3 to 30 perforations per cm2.
7. A material according to Claim 1, wherein the perforations occupy not more than 40% of the area of the polymeric film.
8. A material according to Claim 1, wherein the thermo-setting compound is epichlorohydrin based.
9. A material according to Claim 1, wherein the polymeric film is in the range of 10 to 200 microns in thickness.
10. A material according to Claim 1 wherein the thermosetting compound extending through said perforations adopts a mushroom head configuration.
11. A material according to Claim 1 further comprising a release sheet on the surface of said thermosetting compound layer remote from said polymeric film.
12. A material according to Claim 6 wherein said plastics material has 9 to 18 perforations per cm2.
13. A material according to Claim 7 wherein the perforations occupy between 5 and 20% of the area of the polymeric film.
14. A material according to Claim 1 wherein the layer of said compound is from 0.5 to 1.0 mm in thickness.
15. A material according to Claim 9 wherein the polymer film is in the range of 50 to 100 microns in thickness.
16. A material according to Claim 8 wherein the thermo-setting compound includes a secondary material to allow flexibility.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7937898 | 1979-11-01 | ||
| GB7937898 | 1979-11-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1192795A true CA1192795A (en) | 1985-09-03 |
Family
ID=10508922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000363577A Expired CA1192795A (en) | 1979-11-01 | 1980-10-30 | Pipeline wrapping material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1192795A (en) |
-
1980
- 1980-10-30 CA CA000363577A patent/CA1192795A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |