Tank Car Valve Leak Testing via Segmented Bladder Isolation
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Solution Overview
Problem
Current methods for replacing and leak testing valves on tank cars carrying toxic commodities, such as petroleum crude oil and ethanol, are time-consuming and costly, requiring nitrogen gas or compressed air to pressurize the entire tank car, which can take 30-60 minutes per valve and incur significant expenses.
Innovation Solution
A testing mechanism comprising a pipe plug device with a bladder and pressure fitting to isolate and tighten against the siphon pipe, and a pressure test device with a bladder and fitting to conduct a bubble leak inspection, allowing for efficient valve replacement and leak detection without pressurizing the entire tank car.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitrogen gas or compressed air is used to pressurize the entire tank car for leak testing, then the newly installed valves are ensured to be leak proof, but the process takes significant time (30-60 minutes per valve or tank) and incurs high costs ($600-$800 per tank car per leak test)
Solution Approach 1:
The invention divides the tank car into isolated segments using a plug device that seals off the siphon pipe. This allows leak testing to be performed on individual valve segments rather than requiring pressurization of the entire tank car, thereby reducing testing time from 30-60 minutes to a fraction of that time while maintaining leak detection accuracy.
Solution Approach 2:
The invention extracts the leak testing process from the whole tank car system and isolates it to only the specific valve area being tested. By removing the need to pressurize the entire tank car and focusing only on the local valve segment, the process achieves the same reliability with dramatically reduced time and cost.
2Reliability
If nitrogen gas or compressed air is used to pressurize the entire tank car for leak testing, then the newly installed valves are ensured to be leak proof, but the cost is significant ($600-$800 per tank car per leak test)
Solution Approach 1:
By segmenting the tank car system and isolating only the valve area for testing, the invention dramatically reduces the amount of nitrogen gas required from thousands of gallons to merely a few gallons needed to pressurize the small isolated segment, thereby reducing material costs from $600-$800 to a fraction of that amount.
Solution Approach 2:
The invention extracts the leak testing operation from the entire tank car system and confines it to a small isolated segment. This extraction eliminates the need for large quantities of expensive nitrogen gas while maintaining the same leak detection reliability.
3Productivity
If the entire tank car is pressurized for leak testing, then all valves can be tested, but the process is time-consuming and expensive
Solution Approach 1:
The invention enables rapid sequential testing of multiple valves by isolating each valve area individually. Rather than pressurizing the entire tank car for each valve test, workers can quickly plug off sections and test valves one after another, dramatically improving productivity while reducing total testing time.
Solution Approach 2:
The plug device is installed in advance to create isolated test segments before valve replacement begins. This preliminary action sets up the system for rapid sequential testing, allowing multiple valves to be tested efficiently without repeated full tank car pressurization.
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
This method significantly reduces the time and cost associated with valve replacement and leak testing, ensuring safety and efficiency in handling toxic commodities by isolating the leak testing process to the valve area, thereby minimizing exposure and expenses.
Implementation Method 1
When the pipe plug bladder is inflated, the pipe plug bladder is sized to expand and tighten against the wall of the siphon pipe
Implementation Method 2
a test pressure fitting to pressurize a valve
Data Source
AI summary
Aspects of the invention include methods and systems for a testing mechanism to be utilized when repairing and replacing a valve utilized on a tank car. The testing mechanism may comprise a pipe plug device configured to plug a siphon pipe located on a tank car and a pressure test device to conduct a leak detect test after the pipe plug device is removed from the siphon pipe. The pipe plug device may include a pipe plug bladder and a pipe plug pressure fitting to inflate and deflate the pipe plug bladder against a wall of the siphon pipe. The pressure test device may include a pressure test valve cap with a test valve bladder located on the pressure test valve cap, a bladder pressure fitting to inflate and deflate the test valve bladder, and a test pressure fitting to pressurize a valve, the test pressure fitting located on the pressure test valve cap.