Stuffing Box Seal Unloading Tool with Expandable Grip
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Solution Overview
Problem
The existing methods for removing and replacing worn seals from a stuffing box, particularly in high-flow pumps used in oilfield operations, are inefficient and prone to damaging the internal surfaces, requiring extensive time and leading to economic losses due to prolonged downtime.
Innovation Solution
A kit comprising a footing element and an unloading tool with a selectively expandable grip element and shaft assembly that securely engages and extracts the packed seals from the stuffing box, minimizing friction and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods are used to remove worn seals from stuffing box, then seals can be removed, but the internal surfaces are damaged and extensive time is required
Solution Approach 1:
The patent introduces an intermediary tool (unloading tool with grip element) that mediates between the operator and the packed seals. This tool engages the seals and extracts them without direct contact between operators and seals, preventing damage to internal surfaces while reducing removal time through mechanical advantage
Solution Approach 2:
The unloading tool is segmented into distinct functional components: a shaft for insertion, a grip element with expandable wings for engaging the seals, and a handling mechanism. This segmentation allows each component to perform its specific function efficiently, enabling rapid seal removal without damage
2Productivity
If existing methods are used to remove worn seals from stuffing box, then seals can be removed, but extensive time and economic losses occur due to prolonged downtime
Solution Approach 1:
The grip element features a dynamic cross-sectional profile that can be selectively contracted and expanded. When expanded, it firmly engages the packed seals for efficient extraction; when contracted, it allows easy insertion and removal of the tool. This dynamic adaptation increases seal removal efficiency while minimizing downtime
Solution Approach 2:
The patent replaces manual, time-consuming seal removal methods with a mechanical unloading tool that uses mechanical advantage through its shaft and grip element design. This substitution dramatically increases productivity by enabling rapid seal extraction without prolonged downtime
3Ease of operation
If a grip element with expandable cross-sectional profile is used, then secure engagement of packed seals is achieved, but device complexity increases
Solution Approach 1:
The grip element's wings are nested within the shaft when contracted, creating a compact configuration for easy insertion. When expanded, the wings protrude to engage the packed seals. This nested design achieves secure engagement while minimizing the tool's overall complexity and size
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 kit enables rapid and efficient removal of worn seals without damaging the stuffing box, reducing downtime and operational costs by securely engaging and extracting the packed seals.
Implementation Method 1
a grip element having a cross-sectional profile that can be selectively contracted and expanded
Data Source
AI summary
An unloading system for a stuffing box includes a plate-like footing element within which a stuffing box may be locked. An unloading tool includes concentric inner and outer shafts. A grip element formed at the end of the outer shaft includes a segmented wing section arrayed radially about the tool axis. An enlarged core element is formed at the end of the inner shaft. Relative longitudinal movement of the inner and outer shafts allows the core element to expand or contract the wing section's cross-sectional profile. The unloading tool is actuated within the stuffing box to enlarge the cross-sectional profile of the wing section, which tightly grips the internal walls of the base packing element. Axial force applied to the outer shaft from an elevated platform withdraws the outer shaft from the stuffing box. The gripped base packing element, and the packing elements above it, are concurrently unloaded.