Chromatographic Pump Seal Leak Detection
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Solution Overview
Problem
Detecting leaks in high-pressure chromatographic pumps, particularly with compressible fluids like CO2, is challenging due to the difficulty in measuring leak rates and identifying leak locations without interrupting the chromatographic process.
Innovation Solution
A method and system that utilize a wash fluid to surround a pump piston, measuring the flow rate and composition through a second channel, and employing a bubble detector to determine leaks, allowing for continuous detection and notification of leaks without offline testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offline testing methods are used to detect leaks, then leak detection can be performed, but the chromatographic process must be interrupted
Solution Approach 1:
The system performs preliminary leak detection by continuously monitoring the seal wash fluid flow rate during normal pump operation. The flow rate sensor detects changes in wash fluid flow that indicate seal leakage, allowing leak detection to occur before the chromatographic process needs to be interrupted for maintenance.
Solution Approach 2:
The pump system monitors its own seal condition through the integrated flow rate sensor that continuously measures wash fluid flow. This self-diagnostic capability allows the system to detect leaks autonomously during operation without requiring external offline testing equipment or process interruption.
2Reliability
If traditional leak detection methods are used, then leak presence can be determined, but continuous monitoring during operation is not achieved
Solution Approach 1:
The flow rate sensor continuously measures the wash fluid flow rate throughout pump operation, providing ongoing leak detection capability. This continuous monitoring maintains both high reliability in leak detection and uninterrupted productivity of the chromatographic process simultaneously.
3Measurement precision
If seal wash flow rate is monitored, then leak detection sensitivity improves, but system complexity increases
Solution Approach 1:
The seal wash fluid acts as an intermediary medium that carries information about seal leakage. By monitoring the flow rate of this wash fluid, the system achieves sensitive leak detection without directly measuring the compressed fluid leak, simplifying the overall measurement approach while maintaining high precision.
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
Enables quick and continuous identification of leaks in high-pressure fluid pumps, specifically locating leaks in high-pressure seals, and adjusting pump speed to maintain constant flow rates, enhancing the reliability of chromatographic systems.
Implementation Method 1
measuring a flow rate of fluid exiting the wash seal housing via the second channel
Implementation Method 2
detecting a bubble in the fluid exiting the wash seal housing using a bubble detector
Implementation Method 3
measuring a composition of the wash fluid against a nominal value, and the composition of the wash fluid is determined by a refractive index measurement
Data Source
AI summary
The present disclosure relates to techniques for detecting leaks in a pump. A compressed fluid, such as compressed CO2, is provided through a first channel formed within a pump head. The compressed fluid within the first channel is in contact with at least a portion of a pump piston, and the first channel is substantially sealed using a fluid seal positioned around a portion of the pump piston. A wash fluid is pumped into a second channel formed within a wash seal housing associated with the pump head using a fluid pump. The wash fluid within the second channel surrounds a portion of the pump piston and is separated from the first channel by the fluid seal. A flow rate of fluid exiting the wash seal housing via the second channel is measured, and the existence of a leak is determined based on the measured flow rate.