Pipe Pig Plug Transitions to Minimize Material Mixing
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Solution Overview
Problem
Material processing systems face challenges in minimizing material mixing and reducing transition time between different materials, leading to significant waste and increased costs due to frequent production changes and cleaning requirements in complex piping systems.
Innovation Solution
The use of pipe pigs with specific dimensions and properties to form plugs that inhibit mixing by filling the cross-section of pipes, allowing a second material to push the plug through the system, minimizing the volume of the first material present at the trailing edge to less than 10% and ensuring effective cleaning while preventing dilution of the cleaning fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the piping system is used to process different materials with frequent production changes, then the system must be cleaned between batches, but this leads to significant material waste and increased transition time
Solution Approach 1:
The invention extracts the problematic material from the piping system by using a pig to push it out as a distinct plug, separating the first material from the second material to prevent mixing and minimize waste
Solution Approach 2:
The pig acts as an intermediary device between the first and second materials, creating a physical barrier that prevents direct contact and mixing, thereby reducing material waste during transitions
2Adaptability or versatility
If the piping system includes bends, diameter changes, and equipment with multiple flow passages, then the system can process various materials, but material mixing occurs during transitions
Solution Approach 1:
The invention segments the flow into distinct zones separated by the pig plug, dividing the single flow stream into a first material zone, a pig barrier zone, and a second material zone, preventing mixing in complex piping configurations
Solution Approach 2:
The pig serves as a moving intermediary that maintains separation between materials as they navigate through bends, diameter changes, and equipment with multiple flow passages
3Ease of manufacture
If cleaning fluid is introduced to clean the piping system, then cleaning effectiveness is improved, but the first material dilutes the cleaning fluid reducing its concentration
Solution Approach 1:
The invention extracts the first material from the piping system before introducing cleaning fluid, removing the substance that would otherwise dilute the cleaning fluid and reduce its effectiveness
Solution Approach 2:
The pig pushes out the first material as a plug before the cleaning fluid is introduced, performing the material removal action in advance to preserve the cleaning fluid's concentration and effectiveness
4Loss of time
If the system transitions between materials without intervention, then transition time is reduced, but mixing of materials occurs increasing waste
Solution Approach 1:
The pig acts as a rapid-deploy intermediary that prevents mixing during the transition process, enabling quick material changes without the need for lengthy cleaning procedures
Data Source
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AI summary
A method of minimizing material mixing in a piping system during a transition between a first material and a second material includes providing a plurality of pipe pigs in a first pipe section with the plurality of pipe pigs being sufficient to substantially fill a cross-section of the first pipe section and to define a plug having a leading edge and a trailing edge such that the leading edge is in contact with a first material and the trailing edge is in contact with a second material. Each pipe pig has a nominal size that is smaller than an effective diameter of the first pipe section. The plug is moved through the piping system by moving the second material. Advantageously, mixing of the first material and the second material is inhibited by the plug.