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High teMPERATURE resistant insulating for pipe

A heat-insulating, high-temperature technology, applied in the direction of pipeline protection, pipeline protection through heat insulation, pipeline damage/wear prevention, etc., can solve problems such as high transportation and installation costs, difficult foaming process, poor material cost-to-performance ratio, etc.

Inactive Publication Date: 2011-08-17
SHAWCOR LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The known high thermal conductivity of insulation systems requires extremely thick coatings to achieve the required insulation performance and causes potential difficulties with the foaming process, potential problems with residual stresses, difficulties during pipe laying and sea bed instability
[0008] Insufficient resistance to temperatures exceeding 130°C, resulting in compression and creep resistance problems in high-temperature installations at high water depths
[0009] Excessive costs due to poor material cost-to-performance ratio or high delivery and installation costs
[0010] In casing systems, because the weight factor can lead to bending and weld failure if not properly addressed, as well as the need for high fastening loads during pipe laying, causing disadvantages in installation and operation
[0011] Although Jackson et al. disclosed in International Publication WO 2009 / 079784 A1 that polystyrene-based insulation systems provide superior thermal performance over known insulation systems at operating temperatures up to about 100°C, these polystyrene-based systems generally have insufficient resistance to temperatures above 130°C

Method used

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  • High teMPERATURE resistant insulating for pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] In this embodiment, corresponding to figure 1 , the steel pipe 1 is provided with the above-mentioned three-layer anti-corrosion coating, the three-layer anti-corrosion coating includes the anti-corrosion layer 2 , the adhesive layer 3 and the outer coating 4 . The steel pipe 1 after surface blasting and cleaning had an outer diameter of 140 mm and a wall thickness of 10 mm. Tube 1 was preheated to 200°C and sprayed with 0.300 + / - 0.100 mm thick layer 2 of fusion bonded high temperature epoxy resin powder (density 1400 + / - 100 g / l) followed by immediate passage at 220°C and 220°C respectively. Extrusion was carried out at a melt temperature of 260°C to form 0.300+ / -0.200mm high temperature modified styrene-maleic anhydride copolymer adhesive layers 3 (density 1.060g / cm) on top of the epoxy resin, respectively. 3 , MFR 0.6g / 10min) and 6.0+ / -1.0mm of solid polyphenylene ether-polystyrene blend overcoat 4 (density 1.060g / cm 3 , the melt flow rate is 8g / 10min). The extru...

Embodiment 2

[0165] The anticorrosion pipe produced in Example 1 was subjected to the following processing steps: using an extruder equipped with a sheet die, the outer surface of the anticorrosion pipe was preheated to a temperature of about 220°C, at a temperature of 260°C. The polyphenylene ether-polystyrene blend is wound onto the preheated outer surface at melt temperature to coat the corrosion resistant tube with the same solid polyphenylene ether-polystyrene as outer coating 4 Layer 6 of 20.0+ / -1.0 mm of ethylene blend (degree of foaming = 0%). The properties of the thermally insulated pipes thus produced were tested and the results are shown in Table 3.

Embodiment 3

[0167] Using the coating procedure described in Example 2, the anti-corrosion pipe made in Example 1 was further coated with the following layers: foamed to a density of 0.945 g / cm using 0.5 wt% endothermic chemical blowing agent 3 (degree of foaming = 10%) of the 30.0 + / - 1.0 mm layer 6 of the polyphenylene ether-polystyrene blend of Example 1, and the solid high impact polystyrene modified with polyethylene 5.0+ / -1.0mm outer layer 7 (density 1.020g / cm 3 , the melt flow index is 4.0g / 10min.). The properties of the thermally insulated pipes thus produced were tested and the results are shown in Table 3.

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Abstract

The invention provides a polymeric composition for insulating fluid and / or gas transport conduits, such as off-shore oil and gas pipelines operating at temperatures of 130 DEG C or higher in water depths above 1,000 metres. The outer surface of the conduit is provided with at least one layer of solid or foam insulation comprising a high temperature resistant thermoplastic having low thermal conductivity, high thermal softening point, high compressive strength and high compressive creep resistance. The high temperature resistant thermoplastic is selected from one or more members of the group comprising: polycarbonate; polyphenylene oxide; polyphenylene oxide blended with polypropylene, polystyrene or polyamide; polycarbonate blended with polybutylene terephthalate, polyethylene terephthalate, acrylonitrile butadiene styrene, acrylonitrile styrene acrylate, or polyetherimide; polyamides, including polyamide 12 and 612 and elastomers thereof; polymethylpentene and blends thereof; cyclic olefin copolymers and blends thereof; and, partially crosslinked thermoplastic elastomers, also known as thermoplastic vulcanizates or dynamically vulcanized elastomers.

Description

Field of Invention [0001] The present invention relates to polymer compositions for thermally insulating fluid and / or gas delivery lines, delivery lines thermally insulated with these compositions, and methods for their production and use. More specifically, the polymer composition according to the present invention comprises a high temperature resistant thermoplastic material with low thermal conductivity, high thermal softening point and high compression creep resistance for use in fluid and / or gas transport pipelines such as oil and gas pipelines adiabatic. Background of the Invention [0002] In the oil and gas industry, there is an increasing need for higher performance thermal coatings to insulate and protect offshore pipelines operating in water depths of about 1000 meters and at temperatures of 130°C or higher. To maintain the line at these depths and the required operating temperatures, the coating must have low thermal conductivity, thereby preventing the formatio...

Claims

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Application Information

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IPC IPC(8): F16L59/14F16L57/00F16L58/04F16L9/147
CPCF16L58/1054F16L58/181F16L59/143F16L9/14F16L13/0272B29C45/14598F16L59/20F16L59/028
Inventor P·杰克逊A·杰克逊E·万J·P·海格道尔
Owner SHAWCOR LTD
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