Metal-to-Metal Pipe Joint Seal With Mechanical Interlock
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Solution Overview
Problem
The oil industry faces challenges with cost-efficient and reliable methods for connecting oil pipes that minimize leakage, as existing flanged joints are prone to thermal degradation, require skilled labor, and involve time-consuming welding processes, increasing costs and safety risks.
Innovation Solution
A connector apparatus with a mechanical interlock arrangement and metal-to-metal seal, eliminating the need for flanges and welding, using a metallic olive and cap system with a resilient washer to ensure a strong, corrosion-resistant seal suitable for high pressures and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flanged joints with rubber seals are used, then sealing function is provided, but the seals fail due to thermal degradation and damage from improper assembly
Solution Approach 1:
The patent changes the material parameter of the seal from rubber to metal, which fundamentally alters the thermal resistance properties. The metal seal element can withstand high temperatures without degradation, directly resolving the thermal degradation issue while maintaining sealing reliability through the metal-to-metal contact interface.
Solution Approach 2:
The patent replaces expensive, long-life metal seals with cheaper, short-life rubber seals in traditional flanged joints. However, these rubber seals fail prematurely due to thermal degradation and assembly damage, making the overall system more costly due to frequent replacements and downtime. The invention inverts this approach by using durable metal seals.
2Strength
If welding is used to assemble flanged joints, then strong connection is achieved, but assembly time increases and fire risk is created
Solution Approach 1:
The patent replaces the thermal welding process with a mechanical interlock system consisting of a connector body with interlocking features and a mechanical seal arrangement. This mechanical assembly method achieves strong joint strength through precise mechanical engagement while eliminating the time-consuming welding process and associated fire hazards.
3Reliability
If qualified welders are employed for repairs, then repair quality is ensured, but labor costs increase significantly
Solution Approach 1:
The mechanical interlock design enables field assembly and disassembly by personnel with basic mechanical skills, without requiring specialized welding qualifications. The self-explanatory mechanical features allow operators to properly assemble the joints without extensive training, significantly reducing labor costs while maintaining repair quality through the inherent mechanical precision of the interlock system.
4Reliability
If high precision assembly is required for flange joints, then proper sealing is achieved, but skilled labor requirements and costs increase
Solution Approach 1:
The connector body and seal elements are pre-manufactured with precise interlocking features and sealing surfaces in the factory. This preliminary precision manufacturing eliminates the need for high-precision field assembly, as the components are designed to self-align and engage correctly through their mechanical features, reducing assembly skill requirements while maintaining sealing performance.
Data Source
AI summary
An apparatus for connecting two pipes in fluid communication includes a connector body having opposing open ends, with each open end configured for receiving a free end of a pipe, and a mechanical interlock arrangement for preventing or limiting axial movement of the connector body relative to a free end of a pipe when the free end of the pipe is received in an open end of the connector body. A mechanical seal arrangement provides a metal-to-metal seal between a pipe inserted into one of the open ends and the connector body.