Inflatable Isolation Tool Self-Centering Pipe Sealing
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Solution Overview
Problem
Existing isolation tools for hot work on pipelines become cumbersome and expensive as pipe sizes increase, requiring larger tools that are difficult to install and remove, and lack remote monitoring capabilities.
Innovation Solution
An inflatable isolation tool with radially expandable seal elements and a self-centering mechanism, combined with a lightweight design and adjustable gripper inserts, allows for use across a range of pipe diameters and includes a monitoring unit for remote pressure control and leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the isolation tool is made larger to seal with bigger pipes, then the sealing capability is improved, but the tool becomes heavier and more difficult to install or remove
Solution Approach 1:
The seal elements are designed to be inflatable rather than rigid, allowing them to dynamically expand to match different pipe diameters. This dynamic adaptation enables a single tool to seal effectively across multiple pipe sizes without requiring multiple fixed-size tools, thereby maintaining sealing capability while improving ease of installation.
Solution Approach 2:
The tool utilizes changeable parameters (inflation pressure) to adapt to different pipe diameters. By adjusting the inflation pressure of the seal elements, the same tool can effectively seal against pipes of varying sizes, eliminating the need for multiple fixed-size tools and simplifying installation procedures.
2Adaptability or versatility
If the isolation tool is made larger to seal with bigger pipes, then the sealing capability is improved, but the manufacturing cost and tool expense increase
Solution Approach 1:
The isolation tool is designed with inflatable seal elements that can adapt to multiple pipe diameters, making a single tool universally applicable across different pipe sizes. This multi-functionality eliminates the need to manufacture multiple fixed-size tools, thereby reducing manufacturing costs while maintaining sealing capability.
Solution Approach 2:
By using inflatable seal elements whose diameter can be changed through pressure adjustment, the tool achieves versatility across multiple pipe sizes without requiring multiple physical tool variants. This parameter-based adaptation significantly reduces manufacturing complexity and cost.
3Measurement precision
If technicians monitor seals in close proximity to the hot work zone, then the monitoring accuracy is improved, but the safety of personnel is compromised
Solution Approach 1:
A monitoring unit is introduced as an intermediary device that allows technicians to remotely monitor seal integrity and pressure conditions without being in close proximity to the hot work zone. This intermediary system transmits monitoring data to technicians, maintaining monitoring accuracy while eliminating personnel exposure to harmful vapors and heat.
Solution Approach 2:
The patent replaces direct mechanical/physical monitoring (technicians visually inspecting seals up close) with an electronic monitoring system that uses sensors and communication mechanisms. This substitution allows remote monitoring with high accuracy while keeping personnel safe from the hazardous hot work environment.
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 tool provides a flexible, cost-effective sealing solution that can be easily deployed and removed, maintaining safety and reducing operational costs by minimizing the need for multiple tool sizes and enabling remote monitoring for enhanced safety.
Implementation Method 1
a pair of identical inflatable front and back seal elements... inflatable simultaneously to be deformed radially inwardly against the annular subassembly and radially outwardly into sealing engagement with the pipe
Data Source
AI summary
An isolation tool for positioning in a pipe bore and providing a sealing barrier extending transversely across the pipe bore for isolating a section of the bore during replacement of a pipe section includes: a pair of identical inflatable seals positioned in the tool mid-section by an annular subassembly which secures the seals in position, preventing them from dislodging into the internal tool cavity. Having inflatable seals allows flexibility since the tool can be used within a greater range of pipe diameters. The tool “self-centers” within the pipe in its proper position as gas is pumped into both seals simultaneously through a single gas inlet of a shared plumbing assembly, thereby enabling quick installation and removal. Moveable gripper inserts are tightened against the inner pipe surface to hold the tool stationary. Support leg assemblies assist tool installation and removal. The back plate defines multiple port connections. The tool is electronically monitored by a separate enhanced monitoring unit.