Pump Cartridge Removal Plate for Seized Heavy-Duty Pumps
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Solution Overview
Problem
Conventional cartridge removal tools fail to provide sufficient jacking forces for heavy-duty centrifugal pumps, leading to potential damage and hindered removal processes, especially in oil and gas applications where debris accumulation causes pumps to seize.
Innovation Solution
A method and system using a removal plate with multiple threaded rods and nuts to apply distributed jacking forces, ensuring the pump cartridge remains in tension, allowing for the safe extraction of stuck or seized cartridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional cartridge removal tools with two threaded studs are used, then the pump cartridge can be removed, but the jacking force is insufficient for heavy-duty pumps and may cause damage to internal components
Solution Approach 1:
The removal tool segments the jacking force application by using multiple threaded studs (at least three, preferably four or more) distributed around the pump cartridge instead of just two studs. This distributes the applied force across multiple contact points, increasing total jacking force while reducing stress concentration on individual components.
Solution Approach 2:
The threaded studs are strategically positioned at specific locations around the pump cartridge perimeter, creating localized force application points that optimize the distribution of jacking force. This ensures force is applied where most effective for cartridge removal while minimizing damage risk to internal components.
2Force
If conventional cartridge removal tools are used, then the removal process can proceed, but the tools fail to overcome the sticking force of accumulated debris in oil and gas applications
Solution Approach 1:
By distributing multiple threaded studs around the pump cartridge, the tool creates multiple force application vectors that collectively overcome the adhesive and friction forces generated by debris accumulation. The segmented force application is more effective at breaking the bond between the cartridge and casing than concentrated force from fewer studs.
Solution Approach 2:
The removal tool applies progressive jacking force through the threaded studs and nuts before complete cartridge extraction, gradually overcoming the sticking force of accumulated debris. This preliminary force application loosens the seized cartridge, enabling subsequent removal without requiring excessive force that could cause damage.
3Productivity
If heavy-duty pump cartridge removal is attempted with conventional tools, then removal may be achieved, but the tools lack the capacity to provide large enough jacking forces without causing damage
Solution Approach 1:
The tool uses multiple threaded studs (at least three, typically four or more) arranged around the pump cartridge, with each stud receiving a threaded nut. This segmentation allows the total jacking force to be distributed across multiple force application points, enabling the tool to generate and control large total forces without requiring any single component to withstand excessive stress.
Solution Approach 2:
The removal tool combines multiple threaded studs, nuts, and the removal plate into an integrated system that works together to apply and control large jacking forces. The combination of multiple force application points and the rigid removal plate structure enables the tool to provide the necessary jacking capacity for heavy-duty pumps while maintaining control over the removal process.
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 the safe and efficient removal of high-energy or stuck pump cartridges without damaging internal components, facilitating maintenance and reducing repair costs.
Implementation Method 1
applying a specified torque to a first set of two or more threaded nuts simultaneously to provide a jacking force to the pump cartridge
Implementation Method 2
the jacking force and additional jacking force translate the pump cartridge through and out of the casing of the centrifugal pump
Data Source
AI summary
A method of removing a pump cartridge from a centrifugal pump includes arranging a removal plate about the pump cartridge and abutting the removal plate against a casing of the centrifugal pump, inserting a plurality of threaded rods through a plurality of fastener apertures defined in the removal plate and into a plurality of threaded holes in the pump cartridge, advancing a plurality of threaded nuts onto each threaded rod, applying a specified torque to a first set of two or more threaded nuts simultaneously to provide a jacking force to the pump cartridge, applying the specified torque to one or more additional sets of two or more threaded nuts simultaneously to provide an additional jacking force to the pump cartridge, and removing the pump cartridge from the centrifugal pump, wherein the jacking forces translate the pump cartridge through and out of the casing of the centrifugal pump.