Viscoelastic Pipe Thread Sealant for High-Pressure Leak Control
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Solution Overview
Problem
Existing pipe joint compounds, such as Teflon tape and filament-coated pastes, often lead to leakage issues due to microscopic flaws and defects in threaded connections, causing stress on assemblies and potential blockages, and fail to maintain low leak rates under high pressure.
Innovation Solution
A viscoelastic liquid composition primarily based on silicone oil, combined with friction modifiers like PTFE and graphite, viscosity boosters like fumed silica, and fillers such as calcium carbonate, which forms a non-curing sealant that reduces gas and liquid leakage to extremely low rates by maintaining a high viscosity and inverse pressure-to-leak rate relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Teflon tape is used to seal threaded connections, then sealing is achieved, but the assembly experiences extra stress and strain leading to stress cracking
Solution Approach 1:
The invention changes the physical state parameter of the sealant from solid (tape) to liquid (viscoelastic compound), allowing the sealant to flow into microscopic flaws and defects without imposing mechanical stress on the assembly. This parameter change resolves the contradiction by maintaining sealing effectiveness while eliminating stress-induced cracking.
Solution Approach 2:
The viscoelastic liquid compound acts as an intermediary substance that fills the gap between mating threads, creating a seal without requiring the mechanical deformation associated with tape. The compound's unique rheological properties allow it to mediate between the sealing requirement and the stress avoidance requirement.
2Reliability
If filament or yarn coated pipe wrapping material is used, then sealing is achieved, but the assembly experiences stress and strain that can lead to stress cracking
Solution Approach 1:
The invention transitions from fibrous solid materials to a liquid viscoelastic compound, changing the physical state parameter. This allows the sealant to conform to thread surfaces without the mechanical stress and strain inherent in fibrous materials, resolving the contradiction between sealing effectiveness and assembly strength.
3Reliability
If pipe compounds containing fibers, microfibers or strands are used, then sealing is achieved, but excess compound is pushed out to cause plugging or restrictions
Solution Approach 1:
The invention extracts the fibrous components from traditional pipe compounds, eliminating the source of plugging and restriction problems. By using a pure viscoelastic liquid without solid particulates, the sealant provides effective sealing while preventing the harmful effect of material being pushed into passage ways or orifices.
Solution Approach 2:
The invention changes the rheological parameters of the sealant by eliminating solid content and using a viscoelastic liquid with specific viscosity characteristics. This parameter change ensures the sealant remains pliable under pressure without extruding as discrete fibrous materials that could cause blockages.
4Reliability
If traditional paste or gel sealants are used, then sealing is achieved, but they cannot elongate and break tension almost immediately
Solution Approach 1:
The invention changes the rheological parameter of the sealant from paste or gel state to viscoelastic liquid state with specific elongation properties. This parameter change allows the sealant to extend several inches or feet before tension breaks, dramatically improving durability while maintaining sealing effectiveness.
Solution Approach 2:
The viscoelastic liquid compound represents a composite material state combining viscous and elastic properties, allowing it to both seal effectively and elongate under stress. This composite rheological structure resolves the contradiction between immediate seal effectiveness and long-term durability under tension.
5Reliability
If sealing compounds are used to prevent leakage, then atomic-level sealing is achieved, but the compounds must maintain stability under varying pressure conditions
Solution Approach 1:
The invention applies dynamic rheological properties to the sealant, allowing it to adapt its viscosity and elasticity in response to varying pressure conditions. The viscoelastic liquid can flow under pressure to fill gaps, then maintain its seal when pressure decreases, providing both atomic-level leakage prevention and composition stability across varying operating conditions.
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 viscoelastic liquid composition effectively reduces leakage to atomic levels, maintaining low leak rates even under high pressure, outperforming traditional sealants by preventing blockages and stress cracking, while being food-safe and chemically resistant.
Implementation Method 1
The physical state of the present invention is that of a viscoelastic liquid. That is a liquid that can be stretched or elongated several inches or as much as several feet before the tension breaks.
Implementation Method 2
The present invention as disclosed herein does not rely upon the use of fibrous materials, threads, granules or flakes. The present invention as disclosed herein does not contain solid materials having diameters that would obstruct flow.
Implementation Method 3
The present invention is based on a viscoelastic liquid, primarily silicone oil, namely, polydimethylsiloxane or chemically similar silicone lubricants.
Implementation Method 4
a friction modifier, where the friction modifier includes a fine to ultra-fine polytetrafluoroethylene (PTFE), graphite, molybdenum disulfide and combinations thereof
Implementation Method 5
the friction modifier includes a fine to ultra-fine polytetrafluoroethylene (PTFE), graphite, molybdenum disulfide and combinations thereof
Data Source
AI summary
The present invention describes a pipe sealing compound/adjunct lubricant used to prevent gas or liquid leaks when applied to pipe threads and other connections of the same. The compound relies on silicone oil lubricant(s) and one or more friction modifier(s), viscosity builder(s) and filler material(s). The compound contains a viscoelastic liquid that does not have a curing phase and is resistant to hardening and/or drying. The compound is chemically resistant to a wide variety of liquids and gases, is food safe and can withstand extreme high or low temperatures and precipitous temperature fluctuations. The compound has been found to exhibit an inverse pressure to leak rate phenomena.