Pressure Pipe Connection Thermal Insulation for Temperature Cycling
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Solution Overview
Problem
Existing pipe connections under pressure leak when exposed to varying temperatures due to material stresses and inadequate thermal insulation, leading to unreliable sealing and potential damage.
Innovation Solution
Incorporating a thermal barrier pipe with a graphite seal and a close sliding fit design to decouple the inner cone's thermal reaction from the outer cone, ensuring a consistent seal and preventing material-induced damage, while using a locknut to enhance the breakaway torque of the union nut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner connection piece is directly connected to the fluid without thermal insulation, then the thermal reaction of the inner cone matches the outer cone under stable conditions, but under varying temperature conditions the inner cone reacts faster causing leaks and reduced breakaway torque
Solution Approach 1:
A thermal barrier pipe is introduced as an intermediary element between the fluid and the inner connection piece. This thermal barrier delays the heat transfer from the fluid to the inner cone, matching the thermal reaction speeds of both cones under varying temperature conditions and preventing leaks caused by differential thermal expansion.
Solution Approach 2:
The connection piece is segmented into an inner connection piece and an outer connection piece with a thermal barrier pipe positioned between them. This segmentation allows independent thermal management of each component, enabling the inner cone to thermally react at a controlled rate that matches the outer cone, thereby maintaining sealing reliability under transient thermal conditions.
2Strength
If a solid connection is made between the conical connection piece and the line terminating pipe, then structural strength is improved, but material stresses and damage occur under large temperature variations
Solution Approach 1:
The thermal barrier pipe acts as a mediator that decouples the thermal pathways between the fluid and the connection pieces. This allows the solid mechanical connection to maintain structural strength while preventing harmful thermal stresses from being transmitted to the conical connection piece and line terminating pipe during temperature variations.
Solution Approach 2:
Thermal insulation is applied locally at the critical interface between the fluid and the inner connection piece. This localized thermal management protects the connection from material stresses caused by temperature variations while maintaining the overall structural integrity and strength of the pipe connection assembly.
3Temperature
If the thermal barrier pipe is in direct contact with the inner connection piece, then thermal insulation is maximized, but heat is conducted directly into the cone of the inner sealing face
Solution Approach 1:
The thermal barrier pipe is positioned at a slight radial distance from the inner connection piece, creating a localized air gap that provides thermal insulation. This localized insulation approach prevents direct heat conduction into the sealing cone while maintaining adequate thermal barrier performance, thereby preserving sealing reliability under varying temperature conditions.
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 solution provides a durable and reliable sealed pipe connection capable of handling fluids with significant temperature variations, maintaining integrity even in extreme temperature differences and transient conditions without leaks, and preventing material damage.
Implementation Method 1
a thermal barrier is provided in the axial section of the sealing face of the inner cone, on the inner pipe face... the input of heat or the extraction of heat from the fluid into the cone material or, respectively, from the cone material into the fluid is delayed
Implementation Method 2
a graphite seal is provided in the annular groove
Implementation Method 3
both ends are formed as close sliding fits... prevent the thermal barrier pipe from moving axially along the connection pieces
Data Source
AI summary
A pipe connection for conducting a fluid that is under pressure is provided, having two tubular connection parts for a conical clamping connection, which are screwed together by a union nut while one is inserted in the other, wherein each connection part has a conical sealing surface that contacts the other in a sealing manner and wherein an annular groove is provided in one of the sealing surfaces. In order to enable the pipe connection also to conduct a fluid having cycling or varying temperature, the inner of the two connection parts has thermal insulation on the inside of the pipe at least in the axial segment of the sealing surface of the connection part, wherein the thermal insulation tube has a cam or a collar on the outer surface, which engages in a recess, which is axially bounded by the two connection parts.