High-Torque Pipe Refacing Tool with Mandrel Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for refacing high-torque pipe connections are costly, inconvenient, and often result in crooked or irregularly shaped faces due to difficulties in maintaining equal pressure and the need for pre-dressing of threads, leading to connection failures and inefficiencies in field operations.
Innovation Solution
The development of refacing tools for both box and pin connections, featuring a shaft, mandrel, primary face plate, and torque-stop face plate with bearings and interchangeable abrasive or cutter tips, which maintain the required length and perpendicularity between primary and secondary faces within precise tolerances, allowing for in-field refacing without the need for expensive equipment or transportation to a machine shop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If portable refacing tools with spring-loaded cones are used, then field refacing becomes possible without machine shop transportation, but the refaced faces become crooked or irregularly shaped due to difficulty in maintaining equal pressure
Solution Approach 1:
The patent introduces a mandrel as an intermediary component that threads into the pipe connection and provides a precise reference axis. The refacing tool is mounted on this mandrel, which serves as a mediator between the tool and the pipe, ensuring the tool remains properly aligned and perpendicular to the face being refaced, thereby eliminating the crookedness problem while maintaining field refacing capability
Solution Approach 2:
The patent requires pre-dressing of the threads before refacing operations. This preliminary action prepares the threading surface to ensure proper engagement of the mandrel and refacing tool, establishing the correct geometric foundation before the actual refacing occurs, which prevents irregular face shapes
2Ease of operation
If threaded mandrels are used to secure refacing tools, then field refacing can be performed, but the threads must be pre-dressed and the process becomes time-consuming
Solution Approach 1:
The patent makes thread dressing a preliminary step that must be completed before refacing operations can begin. By addressing the thread condition in advance, the process ensures proper tool engagement and refacing quality, though it does extend the total operation time
3Productivity
If tungsten carbide cutters are used for refacing, then material can be removed from the shoulder, but the cutters can chip and cause irregularities on the face
Solution Approach 1:
The patent specifies precise geometric parameters for the refacing operation, including removing material at a controlled angle of 5 degrees or less from the perpendicular axis. This parameter control ensures that even when using aggressive cutting methods, the final face geometry remains within acceptable tolerances and avoids irregularities
4Strength
If raised and narrow threads are present on high-torque connections, then the connection can handle high torque, but the threads impede the refacing tool from sliding onto the connection
Solution Approach 1:
The patent requires thread dressing as a preliminary step to modify the raised and narrow threads into a smoother, more accessible geometry that allows the refacing tool to engage properly, while preserving the underlying high-strength connection geometry
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 tools ensure that refaced faces are within acceptable tolerances, maintaining the integrity and sealing effectiveness of high-torque connections, reducing the risk of connection failures and enabling efficient, cost-effective maintenance in the field.
Implementation Method 1
an abrasive or cutter removes material from one or both faces
Data Source
AI summary
A high-torque connection refacing tool, including a shaft, a mandrel, a primary face plate, and a torque-stop face plate.