CS196873B1 - Method of increasing the protection of pipeline insulating layers - Google Patents
Method of increasing the protection of pipeline insulating layers Download PDFInfo
- Publication number
- CS196873B1 CS196873B1 CS843877A CS843877A CS196873B1 CS 196873 B1 CS196873 B1 CS 196873B1 CS 843877 A CS843877 A CS 843877A CS 843877 A CS843877 A CS 843877A CS 196873 B1 CS196873 B1 CS 196873B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- increasing
- protection
- insulating layers
- atactic polypropylene
- pipeline insulating
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
Vynález se týká způsobu zvýšení ochrany izolační vrstvy potrubí sestávající z roztaveného ataktického polypropylenu.BACKGROUND OF THE INVENTION The present invention relates to a method for increasing protection of a pipe insulation layer consisting of molten atactic polypropylene.
Je známé řešení podle čs. autorského osvědčení č. 176738, podle něhož se na izolační obal potrubí po jeho navinutí nanese souvislá vrstva roztaveného ataktického polypropylenu, popřípadě s plnidlem o tlouštce alespoň 0,3 mm. Nevýhodou tohoto způsobu je malá mechanická odolnost vrstvy ataktického polypropylénu a její poměrně značná vodopropustnost.It is known solution according to MS. No. 176738, according to which a continuous layer of molten atactic polypropylene, optionally with a filler of at least 0.3 mm thickness, is applied to the insulating sleeve of the pipe after winding. The disadvantage of this method is the low mechanical resistance of the atactic polypropylene layer and its relatively high water permeability.
Tyto nevýhody odstraňuje způsob podle zynálezu, jehož podstatou je, že do roztavelého ataktického polypropylenu se přidá v anožství 0,1 až 30 % hmot. inhibitor koroe, např. inhibitor na bázi chromanů.These disadvantages are overcome by the process of the invention, which comprises adding 0.1-30% by weight to the molten atactic polypropylene. a korea inhibitor, eg a chromate inhibitor.
Při mechanickém porušení izolačního sysimu až na kov přídavek inhibitoru omezí odstatně rychlost koroze. Na ztuhlou izo2 lační vrstvu se nanese vrstva epoxidové pryskyřice o tlouštce min. 0,1 mm.In case of mechanical failure of the insulation system down to the metal, the addition of an inhibitor will considerably reduce the corrosion rate. An epoxy resin layer having a thickness of min. 0.1 mm.
Tím je jednak zajištěna větší mechanická odolnost a jednak je zabráněno poškozování izolace sesychající se zeminou, obsahující jíly, neboť jílovité zeminy mají k hladkému povrchu podstatně menší přilnavost.This, on the one hand, provides greater mechanical resistance and, on the other hand, deterioration of the shrinking insulation containing the clays is prevented, since the clay soils have a considerably less adhesion to the smooth surface.
Příklad provedení:Example:
Na očištěný a odmaštěný kovový povrch potrubí byl nátěrem nanesen při teplotě 130 °C roztavený ataktický polypropylen s 2 % inhibitoru koroze — dvojchromanu draselného K2Cr2 k zamezení nebo omezení vzniku případně postupu koroze při možném poškození izolace. Jedinou operací se docílilo tlouštky izolace 3 mm. Tato izolační vrstva se po ztuhnutí opatřila ještě ochrannou vrstvou o tlouštce 0,1 mm natřením epoxidovou pryskyřicí 2300. Izolace odolala tlaku 0,3 MPa.The cleaned and degreased metal surface of the pipeline was coated with molten atactic polypropylene with a 2% corrosion inhibitor potassium dichromate K 2 Cr 2 at 130 ° C to prevent or reduce the formation or progress of corrosion in the event of damage to the insulation. In a single operation, a 3 mm insulation thickness was achieved. After setting, this insulating layer was provided with a protective layer of 0.1 mm thickness by coating with epoxy resin 2300. The insulation was able to withstand a pressure of 0.3 MPa.
PŘEDMĚT VYNALEZUOBJECT OF THE INVENTION
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS843877A CS196873B1 (en) | 1977-12-16 | 1977-12-16 | Method of increasing the protection of pipeline insulating layers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS843877A CS196873B1 (en) | 1977-12-16 | 1977-12-16 | Method of increasing the protection of pipeline insulating layers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS196873B1 true CS196873B1 (en) | 1980-04-30 |
Family
ID=5434880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS843877A CS196873B1 (en) | 1977-12-16 | 1977-12-16 | Method of increasing the protection of pipeline insulating layers |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS196873B1 (en) |
-
1977
- 1977-12-16 CS CS843877A patent/CS196873B1/en unknown
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