Alky-one Gasket Segmented Core for Corrosive Sealing
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Solution Overview
Problem
Sealing gaskets in severely corrosive environments, such as alkalization plants, face challenges in maintaining effective seals under high stress loads while accommodating surface imperfections and corrosive fluid flow, as traditional materials and designs often compromise between stress distribution and conformability.
Innovation Solution
A multi-zone gasket architecture with a serrated profile core and deformable pillow, where each zone is optimized for specific stress levels, using materials like Monel and expanded PTFE, to achieve consistent sealing stress of 20,000 psi or more, effectively sealing against corrosive environments and surface imperfections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a softer, more conformable material is used to seal imperfections in flange surfaces, then sealing capability on imperfect surfaces is improved, but the stress load capability to isolate the primary seal from corrosive material deteriorates
Solution Approach 1:
The gasket is divided into multiple functional zones: a softer inner zone (Zone A) for sealing surface imperfections and a harder outer zone (Zone C) for withstanding high stress loads and isolating the primary seal from corrosive material. This segmentation allows each zone to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the gasket are assigned different material properties and thicknesses according to their specific functional requirements. The inner portion uses softer, more compressible material for conforming to surface imperfections, while the outer portion uses harder, more stress-resistant material for load-bearing and corrosion isolation.
2Stability of the object's composition
If the load bearing surface of the gasket is increased to distribute stress, then stress distribution is improved, but the stress per square inch deteriorates
Solution Approach 1:
The gasket employs varying thickness across different zones to optimize stress distribution. The inner zone has greater thickness to provide compliance and seal imperfections, while the outer zone has reduced thickness to concentrate and maintain high stress levels at the primary sealing interface, achieving both distribution and concentration where needed.
3Strength
If the gasket is designed to withstand high stress loads of 20,000-30,000 psi or more, then sealing effectiveness under high stress is improved, but the ability to conform to surface imperfections deteriorates
Solution Approach 1:
The gasket is segmented into compliant inner zones for conformability and rigid outer zones for high-stress sealing. This allows the gasket to simultaneously achieve high stress load capability and surface imperfection sealing by distributing these functions to different zones with appropriate material properties.
Solution Approach 2:
The gasket utilizes composite construction with different materials in different zones - softer, more compressible materials in the inner zones for conformability, and harder, more stress-resistant materials in the outer zones for high-stress sealing performance.
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 gasket design ensures a consistent high sealing stress of 20,000 psi or more on the primary sealing element, while being soft enough to seal surface imperfections, effectively preventing corrosive fluid flow, and distributing stress evenly across zones to maintain seal integrity under varying conditions.
Implementation Method 1
upon compression to a thickness no less than the core thickness, the gasket inner portion exhibits a stress level sufficient to preclude corrosive liquid flowing through the pipe from passing radially outward beyond the gasket inner portion
Implementation Method 2
The deformable pillow material and thickness are selected such that upon compression... the gasket inner portion exhibits a stress level sufficient to preclude corrosive liquid flowing through the pipe from passing radially outward
Data Source
AI summary
A method is provided for forming a gasket for sealing opposing flange surfaces of a pipe having corrosive fluid flowing therethrough. The method comprises defining a gasket profile incorporating a serrated profile core having a flange extending radially inward therefrom. A deformable pillow extends radially inward from the serrated profile core, to define a gasket intermediate portion about the flange, and a gasket inner portion radially inward from the flange. The deformable pillow material and thickness are selected such that upon compression to a thickness no less than the core thickness, the gasket inner portion exhibits a stress level sufficient to preclude corrosive liquid flowing through the pipe from passing radially outward beyond the gasket inner portion, and the gasket intermediate portion exhibits a stress level sufficient to preclude gas and liquid flowing through the pipe from passing radially outward beyond the gasket intermediate portion.