Plunger Protective Packaging for Pump Alignment
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Solution Overview
Problem
The frequent replacement of plunger pumps in the oil and gas industry is hindered by the difficulty of aligning the plunger with the packing for fluid-tight insertion, leading to potential damage and shortened service life, especially during transport and installation.
Innovation Solution
A plunger assembly comprising a cylindrical plunger housed in an elongated tube with a removable cap and a slidable plate, allowing axial alignment and insertion into the pump cylinder, protected by a protective liner and guide mechanisms to prevent damage and ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plunger is inserted through new packing to achieve fluid-tight fit, then the sealing performance is improved, but the insertion difficulty increases and risk of damage to both plunger and packing worsens
Solution Approach 1:
A protective tube with internal diameter slightly larger than the plunger diameter is introduced as an intermediary device. The plunger is inserted into this protective tube, which then guides it through the packing. The protective tube acts as a mediator that prevents direct contact between the plunger and packing during insertion, eliminating misalignment risks while maintaining the fluid-tight sealing performance.
Solution Approach 2:
The protective tube is prepared in advance with the plunger inside it before the actual installation into the pump. This preliminary assembly ensures the plunger is pre-aligned and protected, so that when the protective tube is subsequently inserted through the packing, the plunger follows the correct path without risk of misalignment or damage.
2Device complexity
If the plunger is transported without protective packaging, then the device complexity is reduced, but the risk of damage during transport increases leading to shortened service life
Solution Approach 1:
The plunger is nested within the protective tube, forming a compact assembly where the plunger (inner object) is contained within the protective tube (outer object). This nested configuration provides protection during transport and handling while adding minimal complexity, as the protective tube simply encloses the plunger without requiring additional complex packaging structures.
3Speed
If misalignment occurs during plunger insertion, then the insertion speed is improved by force, but the damage to packing and plunger increases reducing their service life
Solution Approach 1:
The protective tube serves as a guiding intermediary that constrains the plunger's movement path. Even if force is applied quickly for rapid insertion, the protective tube's internal walls prevent lateral deviation, ensuring the plunger remains centered and aligned with the packing throughout the high-speed insertion process, thereby preventing damage.
Data Source
AI summary
A system for installing replacement plungers in plunger pumps used in the hydrocarbon industry includes an elongated, cylindrical plunger body with an elongated circular tube disposed around the cylindrical plunger body. An end wall having an aperture encloses one end of the tube with an axially movable plate adjacent the end wall between the end wall and an end of the plunger body. A removable cap is mounted to the opposite end of the tube to enclose the plunger body within the tube. The outer diameter of the tube fits in the plunger bore of a pump. To install the replacement plunger, the cap is removed and the tube is inserted into the plunger bore until the tube abuts packing within the tube. Once positioned, an axial force is applied to the movable plate to urge the plunger body from the tube and into engagement with the packing.