Pipe Coating Heating Apparatus with Closed-Loop Temperature Control
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Solution Overview
Problem
Current pipe coating heating methods lack control, leading to overheating, limited depth of heating, and variability in field joint coating processes, which can result in weak interfaces and reduced mechanical strength due to uncontrolled heat application and lack of non-destructive verification methods.
Innovation Solution
A controlled heating apparatus with first and second heating units, temperature sensors, and a controller to maintain stable temperature, using radiant heaters that reach operating temperature quickly and cool down rapidly, allowing for precise heat penetration and distribution, and enabling closed-loop feedback control for consistent heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If uncontrolled heating methods are used to heat pipe coating, then heating speed is improved, but temperature control precision deteriorates leading to overheating and weak interfaces
Solution Approach 1:
The patent implements feedback control by using temperature sensors (such as pyrometers) to continuously monitor the temperature of the pipe coating surface and adjusting the heating power accordingly. The controller receives temperature signals from the sensors and modulates the heating units to maintain the desired temperature range, preventing both overheating and underheating while achieving rapid and precise temperature control.
2Length of stationary object
If high power heating is applied to achieve sufficient heating depth, then heating depth is improved, but risk of surface oxidation and material degradation increases
Solution Approach 1:
The patent changes the heating parameters by using radiant heating elements that emit specific wavelengths of radiation optimized for penetrating the polypropylene coating without excessive surface heating. The system also dynamically adjusts heating parameters (power, duration, distribution) based on real-time temperature feedback, allowing sufficient heating depth to be achieved while maintaining surface temperature within safe limits to prevent oxidation and degradation.
3Productivity
If radiant heating tubes are used with quick response time, then heating efficiency is improved, but device complexity increases due to need for control systems
Solution Approach 1:
The patent implements self-service control where the system automatically monitors its own performance through temperature sensors and adjusts heating parameters without external intervention. The controller autonomously processes temperature feedback from pyrometers and modulates heating element power accordingly, enabling rapid and efficient heating while managing complexity through automated self-regulation rather than manual control.
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 controlled heating apparatus ensures consistent and efficient heating of pipe coatings, preventing overheating and ensuring sufficient fusion for strong field joint coatings, while accommodating varying pipe regions and environmental conditions, improving the integrity and reliability of the coating process.
Implementation Method 1
heating units arranged to heat different regions of the coating of the pipe
Implementation Method 2
each heating unit being provided with a pyrometer arranged to measure a temperature of a region of a surface of the pipe coating being heated by the heating unit
Data Source
Figure 1
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AI summary
An apparatus (1) for heating a pipe (2, 3), having at least one heating unit (12, 26), at least one temperature sensor (19) and a controller (20), wherein the controller (20) is arranged to control the at least one heating unit (12, 26) in dependence on the temperature measured by the temperature sensor (19).