Double-Shoulder Serrated Gasket Electrical Insulation
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Solution Overview
Problem
Conventional metallic gaskets used in high-pressure applications, such as pipeline and offshore oil extraction, face challenges with low flashover voltage threshold and electrical resistance due to electrical 'leak paths' formed near the interface of sealing and fire-safe materials, which compromise their ability to provide effective electrical insulation and mechanical strength.
Innovation Solution
A double-shoulder, double-rail serrated metal gasket design featuring a metal core with inner and outer serrated annular sections, an annular groove, and specific thickness ratios for sealing materials, including PTFE and fire-safe materials, to enhance electrical insulation and mechanical strength by altering the flashover location and increasing electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional metallic gaskets use a metal core with two facing materials (sealing and fire-safe), then mechanical strength and fire-safe protection are provided, but electrical resistance and flashover voltage threshold are reduced due to electrical leak paths at the material interface
Solution Approach 1:
An intermediary component (insulating ring or insulating layer) is introduced between the sealing material and fire-safe material to block the electrical leak path at their interface. This intermediary prevents direct electrical contact between the two materials, thereby maintaining high electrical resistance and flashover voltage threshold while preserving the mechanical strength provided by the metal core and the functional properties of both facing materials.
Solution Approach 2:
The gasket employs a composite structure consisting of a metal core with two different facing materials (sealing material and fire-safe material) bonded to opposite surfaces. This composite design integrates the advantages of each material: the metal core provides mechanical strength, the sealing material ensures leak-free performance, and the fire-safe material provides fire-resistant protection. The composite structure resolves the contradiction by combining materials with complementary properties while using an insulating intermediary to maintain electrical insulation.
2Reliability
If non-metallic gaskets are used, then electrical insulation and fire-safe protection are provided, but mechanical strength is insufficient for high-pressure applications
Solution Approach 1:
The invention uses a composite material structure where a metal core (high mechanical strength) is combined with non-metallic facing materials (high electrical insulation and fire-safe properties). This composite approach allows the gasket to simultaneously achieve the electrical insulation and fire-safe protection of non-metallic materials while obtaining the mechanical strength necessary for high-pressure applications from the metal core.
Solution Approach 2:
The gasket is segmented into distinct functional zones: a metal core responsible for mechanical strength and pressure resistance, and non-metallic facing materials responsible for electrical insulation and fire-safe protection. This segmentation allows each component to optimize its specific function without compromising the overall performance, resolving the contradiction between mechanical strength and electrical insulation properties.
3Reliability
If the interface between sealing and fire-safe materials is minimized, then electrical leak paths are reduced, but manufacturing complexity increases
Solution Approach 1:
By introducing an insulating ring or insulating layer as an intermediary component at the interface between sealing and fire-safe materials, the design effectively eliminates electrical leak paths without requiring complex manufacturing processes. The intermediary can be easily integrated into the existing gasket manufacturing workflow, such as by bonding the insulating ring to the metal core or incorporating the insulating layer during the facing material application process, thus maintaining ease of manufacture while significantly improving electrical insulation reliability.
Data Source
AI summary
An isolation gasket that includes a metal core (100) defining an inner serrated annular section (105) that is radially spaced from an outer serrated annular section (110); and an annular groove (115) formed between the inner and outer serrated annular sections; and a first material (135) accommodated in the annular groove (115). In certain embodiments, a second material (125) is coupled to the inner serrated annular section (105); and a third material (130) is coupled to the outer serrated annular section (110). In one embodiment, the second material (125) has a first thickness (160) and the third material (130) has a second thickness (165) that is less than the first thickness (160). In one embodiment, the metal core (100) defines a first inner diameter (180) and the second material defines a second inner diameter (157) that is less than the first inner diameter (180).