Integrated SSD Marker Station for Safer Pipeline AC Mitigation Testing
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Solution Overview
Problem
The installation of above-ground Solid State Decouplers (SSDs) for AC mitigation in underground metallic pipelines is often obstructed by landowners due to their perceived unsightliness, tripping hazards, and aesthetic concerns, necessitating time-consuming renegotiation of easements and posing safety risks during testing.
Innovation Solution
An integrated SSD device and pipeline marker with a compact, above-ground profile that serves dual purposes, featuring a vertical tube with a disconnection switch and testing ports on a test panel, allowing for safe and efficient testing without manual cable disconnection, and a lockable cover for safety, resembling conventional location markers or corrosion test stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional above-ground SSD installations are used for AC mitigation, then AC interference effects are reduced, but landowners object due to unsightliness and tripping hazards, requiring easement renegotiation
Solution Approach 1:
The patent combines the SSD device with an above-ground pipeline marker into a single integrated structure. The SSD housing serves dual purposes: providing AC mitigation functionality and acting as a visible pipeline location marker. This merger eliminates the need for separate SSD installations that landowners object to, as the combined structure fulfills both safety and aesthetic requirements.
Solution Approach 2:
The integrated SSD device performs multiple functions simultaneously: (1) AC mitigation through the decoupler circuitry, (2) pipeline location marking for excavation safety, and (3) corrosion testing capability through integrated test ports. This multi-functionality resolves the contradiction by making the SSD acceptable to landowners while maintaining its protective function.
2Measurement precision
If manual cable disconnection is used for SSD testing, then testing can be performed, but technician shock hazards increase and testing time increases
Solution Approach 1:
The patent replaces the mechanical cable disconnection method with an integrated test panel featuring accessible test ports and a disconnect switch. This allows technicians to perform SSD testing through electrical connections at the test panel without manually disconnecting cables, eliminating shock hazards from cable handling and reducing testing time.
Solution Approach 2:
The integrated test panel provides self-contained testing capability with built-in test ports and disconnect switch. The system serves its own testing needs through the lockable test panel that provides secure, easy access to test points, eliminating the need for external testing equipment and manual cable manipulation.
3Reliability
If SSD devices are installed above-ground for AC mitigation, then AC interference is reduced, but aesthetic concerns arise requiring fencing or cattle guards
Solution Approach 1:
The patent merges the SSD housing with the pipeline marker structure, creating a single aesthetic unit. The vertical orientation and compact design of the integrated structure blend with typical pipeline marker aesthetics, eliminating the need for additional fencing or cattle guards that would be required for separate SSD installations.
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 solution minimizes easement renegotiation needs, reduces technician shock hazards, decreases testing time, and provides a more aesthetically pleasing appearance compared to conventional SSD installations, while maintaining functionality as both an SSD and a pipeline marker.
Implementation Method 1
The SSDs are designed with a high-valued capacitor in the connection circuit between the pipeline and the grounding conductor, thereby functioning as a good conductor of the EMF-induced AC current (at 50 or 60 Hz) while blocking the DC cathodic protection current from reaching the grounding conductor.
Data Source
AI summary
A pipeline AC mitigation SSD Marker Station has a shape and land surface area footprint that are similar to conventional pipeline location markers or corrosion test stations. The SSD Marker Station includes an SSD device that connects an underground metallic pipeline to an underground grounding conductor. The SSD Marker Station further includes a disconnect switch configured to disconnect the SSD device from the pipeline and/or grounding conductor. Also included is a pair of testing ports that are in electrical communication with the SSD device. Testing of the SSD device thereby requires only operating the disconnect switch to isolate the SSD device from the pipeline and/or grounding connector and performing an electrical measurement across the testing ports. In embodiments, the SSD Marker Station meets all requirements applicable to a pipeline location marker, and can be installed in lieu of a pipeline location marker.