Threaded Packing Sleeve for Fast Seal Replacement in Fracturing Pumps
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Solution Overview
Problem
Existing sealing systems in pumping systems, particularly in hydraulic fracturing applications, face challenges due to erosion and corrosion from corrosive fluids and particulates, leading to component damage and prolonged downtime.
Innovation Solution
A packing assembly with a sleeve and seal configuration that includes a sleeve with radially outward coupling components for easy installation and removal using an installation tool, allowing for rapid replacement of sealing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sealing systems are used in pumping systems, then the system can operate continuously, but the sealing components become eroded or damaged due to corrosive fluids and particulates, leading to prolonged downtime for maintenance
Solution Approach 1:
The sealing system is divided into separate replaceable components including a plunger rod seal, a packing set with packing components, and a sleeve. This segmentation allows individual components to be replaced independently based on their wear conditions, enabling faster maintenance compared to replacing entire sealing assemblies.
Solution Approach 2:
The sleeve is provided with an internal diameter that is larger than the external diameter of the plunger rod, creating a radial clearance. This parameter change allows the plunger rod to reciprocate freely within the sleeve while maintaining sealing through the packing components, reducing friction and wear on the plunger rod while still preventing fluid leakage.
2Duration of action of stationary object
If sealing components are made more durable to resist erosion and corrosion, then component lifespan is extended, but the complexity of the sealing system increases
Solution Approach 1:
The sealing system is divided into separate replaceable components including a plunger rod seal, a packing set with packing components, and a sleeve. This segmentation allows individual components to be replaced independently based on their wear conditions, enabling faster maintenance compared to replacing entire sealing assemblies.
Solution Approach 2:
The packing components are designed as consumable elements that can be easily replaced when worn. The packing set includes multiple packing components that can be individually replaced without replacing the entire sleeve or plunger rod, providing an economical maintenance strategy where low-cost components are periodically replaced rather than investing in more complex durable designs.
3Ease of operation
If the sleeve internal diameter is increased to accommodate plunger rod reciprocation, then friction and wear are reduced, but fluid leakage through the clearance increases
Solution Approach 1:
Packing components are introduced as intermediary elements between the plunger rod and the sleeve wall. These packing components fill the radial clearance created by the sleeve's larger internal diameter, preventing fluid leakage while allowing the plunger rod to reciprocate smoothly. The packing components act as a mediator that reconciles the need for clearance (for smooth operation) with the need for sealing (to prevent leakage).
Solution Approach 2:
The packing components are designed as flexible elements that can deform to conform to the plunger rod surface and seal against the sleeve wall. This flexibility allows the packing to maintain an effective seal despite the radial clearance, while still permitting the plunger rod to move reciprocally without excessive friction.
Data Source
AI summary
A packing assembly includes a packing sleeve having a first sleeve portion and a second sleeve portion, wherein a first sleeve portion outer diameter is larger than a second sleeve portion outer diameter and a first sleeve portion inner diameter is larger than a second sleeve portion inner diameter. The packing assembly also includes a groove formed in the second sleeve portion outer diameter. The packing assembly further includes a shoulder formed at a transition between the first sleeve portion and the second sleeve portion. The packing assembly includes a shelf formed at the transition between the first sleeve portion and the second sleeve portion. The packing assembly also includes a plurality of packing components arranged within the first sleeve portion inner diameter, at least a portion of the plurality of packing components engaging the shelf. The packing assembly further includes a seal positioned within the groove.