Mechanical Seal Barrier Pressure Tracking to Limit Fluid Refill
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Solution Overview
Problem
Existing dual mechanical seal barrier systems face issues such as operating with higher-than-required pressure differentials, pressure variations due to ambient temperature changes, and increased frequency of fluid replenishment, which affect seal reliability and complexity of control systems.
Innovation Solution
A barrier system with a pressure tracking device and flow meters to monitor and maintain the volume of barrier fluid, ensuring the pressure remains above the product pressure, utilizing a bladder accumulator and adjustable gas supply to optimize pressure differential and minimize temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed gas pre-charge is used in the bladder accumulator, then the system is simpler to implement, but pressure variations occur when ambient temperatures vary
Solution Approach 1:
The system compensates for temperature-induced pressure variations by dynamically adjusting the barrier fluid pressure to track the product pressure, which serves as a reference. This overrides the natural temperature effects on the pre-charged gas, maintaining stable pressure differential despite ambient temperature changes.
Solution Approach 2:
The pressure tracking system implements feedback control by continuously monitoring product pressure and adjusting barrier fluid pressure accordingly. This feedback mechanism compensates for temperature variations and other disturbances, maintaining stable operating conditions for the mechanical seal.
2Stress or pressure
If the volume of usable liquid is limited by acceptable pressure variations, then the pressure stability is improved, but the frequency of fluid replenishment increases
Solution Approach 1:
The system dynamically adjusts the barrier fluid pressure to closely track the product pressure, allowing the bladder accumulator to maintain a larger volume of usable liquid. By accepting larger pressure variations that still provide adequate barrier protection, the system reduces the frequency of fluid replenishment while maintaining seal reliability.
Solution Approach 2:
The system changes the acceptable pressure variation parameters by allowing larger fluctuations in barrier fluid pressure while maintaining the minimum required pressure differential. This is achieved through pressure tracking that ensures the barrier function is always adequate, even during larger pressure swings.
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 system automatically adjusts pressure to maintain optimal reliability of the mechanical seal, reduces the impact of temperature variations, and extends the usable fluid volume, minimizing unnecessary fluid replenishment.
Implementation Method 1
a bladder accumulator that is used to both pressurise the barrier fluid and to hold a volume of barrier fluid
Implementation Method 2
means for maintaining the barrier fluid pressure at a pre-determined pressure above product pressure
Implementation Method 3
the volume of barrier fluid in the system is monitored by a flow meter
Data Source
AI summary
A barrier system for a dual mechanical seal, the system comprising means for controlling barrier fluid pressure relative to product pressure. The pressure control means comprises means for monitoring the volume of barrier fluid in the system and for supplying additional fluid to the system to maintain the volume within a desired range. The system further comprises means for maintaining the barrier fluid pressure at a pre-determined pressure above product pressure.