Subsea Thermal Insulation Using Cold-Curing Phenolic Syntactic Foam
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Solution Overview
Problem
Existing thermal insulation systems for subsea oil and gas equipment are costly, cumbersome, and ineffective in maintaining high oil temperatures, leading to issues like hydrate and wax formation, pipe blockages, and increased production costs, while also requiring frequent maintenance and methanol injection.
Innovation Solution
A thermal insulating structure comprising a flexible inner tie coat, a foam insulating layer with glass cenospheres and nitrile butadiene rubber, and an outer protective layer, all based on cold curing phenolic resin and partial phosphate ester, which provides enhanced mechanical and thermal properties, including resistance to sea water and temperature extremes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive insulation systems are used, then installation cost and complexity are reduced, but the insulation material must be impermeable to sea water, resistant to temperature extremes, and sufficiently resilient to resist flexural and impact stresses
Solution Approach 1:
The patent applies composite materials by combining phenolic resin with glass cenospheres, nitrile butadiene rubber, and amino functional silane coupling agent to create a syntactic foam that simultaneously achieves water impermeability, thermal insulation, flexibility, and mechanical strength. The glass cenospheres provide buoyancy and structural integrity while the rubber component adds flexibility to withstand subsea mechanical stresses.
Solution Approach 2:
The patent changes the physical and chemical parameters of the insulation material by using cold-curing phenolic resin that can be applied at ambient temperatures, then cured in place to achieve the required density, flexibility, and impermeability. The material formulation is optimized to balance thermal conductivity, mechanical strength, and flexibility for subsea conditions.
2Temperature
If electrical heating elements or active heating systems are used, then oil temperature is maintained, but installation cost and maintenance requirements increase
Solution Approach 1:
The patent extracts the heating function from the insulation system by using passive thermal insulation alone, eliminating the need for electrical heating elements, control systems, and associated infrastructure. The high-performance foam material provides sufficient thermal resistance to maintain oil temperature without active heating.
Solution Approach 2:
The insulation system performs self-service by maintaining oil temperature through its inherent thermal insulation properties, without requiring external energy input or control systems. The material's low thermal conductivity and high thermal mass allow it to retain heat and maintain temperature passively.
3Loss of energy
If rigid insulation materials are used, then thermal insulation performance is improved, but the material cannot accommodate flexural and impact stresses during installation and service
Solution Approach 1:
The patent incorporates flexible components by adding nitrile butadiene rubber to the syntactic foam formulation, creating a material that can flex and deform to accommodate mechanical stresses during installation and service while maintaining its thermal insulation performance. The flexible binder allows the rigid glass cenospheres to move relative to each other without causing structural failure.
4Adaptability or versatility
If insulation material is formed into complex shapes, then it can accommodate subsea equipment geometry, but manufacturing and installation difficulty increase
Solution Approach 1:
The patent employs a dynamic application process where the cold-curing phenolic resin foam is applied in a flexible, workable state that can be molded to complex shapes, then cured in place to achieve the final rigid-insulated structure. This allows the material to be formed around irregular subsea equipment geometries without requiring pre-fabrication of complex shapes.
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
The structure effectively maintains high oil temperatures, reduces the risk of hydrate and wax formation, decreases maintenance needs, and lowers production costs by providing superior thermal insulation and mechanical resilience, ensuring the economic viability of subsea projects.
Implementation Method 1
a flexible inner tie coat which can bond to the substrate, the tie coat being the reaction product of a first material including a cold curing phenolic resin and a second material including a partial phosphate ester
Implementation Method 2
a foam insulating layer which is the reaction product of a cold cure phenolic syntactic resin and a partial phosphate ester
Implementation Method 3
a foam insulating layer which is the reaction product of a cold cure phenolic syntactic resin and a partial phosphate ester
Implementation Method 4
The tie coat, insulating layer and/or outer layer may include an amino functional silane coupling agent
Data Source
AI summary
A subsea thermal insulating structure with a flexible inner tie coat which is the reaction product of a cold curing phenolic resin and a partial phosphate ester; a foam insulating layer which is the reaction produce of a cold cure phenolic syntactic resin and a partial phosphate ester; and an outer protective layer which is the reason product of a cold cure phenolic resin and a partial phosphate ester.