High-Temperature Thermoplastic Insulation for Subsea Pipelines
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Solution Overview
Problem
Current thermal insulation technologies for subsea oil and gas pipelines face challenges with high thermal conductivity, insufficient resistance to temperatures above 130°C, and compressive creep issues at deep water depths, leading to inefficiencies and increased costs due to the need for thicker coatings and potential deployment problems.
Innovation Solution
The development of high-temperature resistant thermoplastic solid or foam insulation with improved thermal and mechanical properties, including low thermal conductivity, high compressive creep resistance, and ductility, applied in multi-layer corrosion protection systems with specific adhesion techniques to ensure effective bonding and foam integrity, tailored for precise thermal insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional thermal insulation foam technology is used, then the coating can be applied to subsea pipelines, but the thermal conductivity is relatively high requiring excessively thick coatings
Solution Approach 1:
The patent changes the material parameters by using polyphenylene oxide-based compositions with specific thermal properties (thermal conductivity 0.15-0.25 W/mK, Vicat softening point 130-200°C) to achieve better thermal insulation performance with reduced thickness compared to traditional foams
Solution Approach 2:
The patent employs composite material systems including polyphenylene oxide blended with polypropylene, polystyrene and/or polyamide, along with foaming agents and stabilizers, to create a multi-phase insulation material that optimizes both thermal performance and mechanical properties
2Temperature
If insulation coating is applied to withstand high temperatures, then temperature resistance improves, but compressive creep resistance decreases at high water depths
Solution Approach 1:
The patent optimizes the Vicat softening point parameter to 130-200°C and adjusts the polyphenylene oxide content (at least 50 wt%) to achieve the right balance between temperature resistance and compressive creep resistance, preventing both thermal degradation and excessive compression at depth
Solution Approach 2:
The patent controls the degree of foaming to balance thermal insulation benefits with mechanical strength requirements, creating a porous structure that provides low thermal conductivity while maintaining sufficient compressive creep resistance through optimized cell structure and material composition
3Ease of operation
If the coating is made more ductile to prevent cracking during installation, then handling performance improves, but structural integrity at high temperatures may compromise
Solution Approach 1:
The patent adjusts the composition parameters including the blend ratio of polyphenylene oxide with other polymers and the selection of stabilizers to achieve optimal ductility for installation while ensuring structural integrity at operating temperatures through controlled crosslinking and molecular structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides enhanced thermal insulation and mechanical protection for subsea pipelines, maintaining performance at elevated temperatures and high hydrostatic pressures, reducing the risk of hydrate and wax formation, and minimizing deployment and operational issues, while optimizing material costs and performance.
Implementation Method 1
the coatings must have low thermal conductivity to prevent the formation of hydrates and waxes
Implementation Method 2
The thermal conductivity can be further decreased through foaming the coating to some required degree
Data Source
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AI summary
A polymeric composition for insulating fluid and/or gas transport conduits, such as off-shore oil and gas pipelines operating at temperatures of 130°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.