Pipe Sleeve Heater Baffle Layout for Uniform Sleeve Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heating methods for pipe sleeves are inefficient, unsafe, and fail to provide uniform heating, leading to issues like point heating and cold spots, which hinder the effective repair of defective pipes by creating uneven temperature differentials between the sleeve and the pipe.
Innovation Solution
A pipe sleeve heater with a frame and multiple burners, each equipped with a baffle and deflector to diffuse the flame, ensuring even heat distribution across the sleeve's surface, minimizing point heating and cold spots, and allowing for simultaneous heating of the entire surface without manual manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple workers use hand-held propane torches to heat the sleeve, then heating can be performed, but the heating is neither uniform nor efficient and creates safety hazards
Solution Approach 1:
The heating system is divided into multiple independent burner units (typically 3-4 burners) positioned around the sleeve, each with its own baffle assembly. This segmentation allows simultaneous heating of multiple zones, improving uniformity and efficiency while reducing safety risks compared to manual torch operation.
Solution Approach 2:
A baffle plate is introduced as an intermediary element between the flame source and the sleeve. The baffle diffuses the concentrated flame into a broader heat distribution pattern, preventing point heating while maintaining heating efficiency. This mediator transforms the harmful concentrated thermal energy into useful distributed heat.
2Temperature
If solid plates are placed in flame paths to prevent point heating, then point heating is reduced, but cold spots develop and heat dispersal becomes inadequate
Solution Approach 1:
The baffle plate is designed with spatially varying properties: the central region has openings or reduced thickness to allow heat penetration to prevent cold spots, while the peripheral regions provide diffusion to prevent point heating. This local differentiation of the baffle structure optimizes both uniformity and adequate heating.
Solution Approach 2:
The baffle geometry is optimized by adjusting parameters such as plate thickness, opening size and distribution, and distance from the flame source. These parameter changes enable the baffle to simultaneously achieve flame diffusion and adequate heat transfer, eliminating both point heating and cold spots.
3Temperature
If the heating apparatus is designed to provide uniform heating, then heating effectiveness improves, but the complexity of the device increases
Solution Approach 1:
The heating apparatus is segmented into modular burner-baffle assemblies that can be independently positioned around the sleeve. Each module is a self-contained unit, simplifying the overall design while achieving uniform heating through distributed heat sources. The modular nature also facilitates ease of assembly and maintenance.
Solution Approach 2:
The baffle plate serves multiple functions simultaneously: it diffuses the flame to prevent point heating, structurally supports the burner assembly, provides spacing between the flame and sleeve, and can be designed to direct heat distribution patterns. This multi-functionality reduces the need for additional components, simplifying the overall device.
4Productivity
If rapid heating of the entire sleeve is achieved, then the repair process is accelerated, but heat may penetrate to the underlying pipe
Solution Approach 1:
The heating approach transitions from concentrated point-source heating to distributed multi-point heating arranged in a spatial pattern around the sleeve. This dimensional arrangement of multiple burners at different angular positions enables rapid overall heating while the natural heat dissipation paths and controlled flame zones prevent excessive heat penetration to the underlying pipe.
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 rapid, uniform heating of the sleeve, reducing labor and safety risks, enabling efficient repair of pipes under pressure without disrupting pipeline operations and allowing for immediate access to welding areas, while also being easily removable and storable.
Implementation Method 1
a deflector proximate said given point intermediate said vent arrangement and facing said heating nozzle for impacting and redirecting said flame therefrom toward said vent arrangement and periphery of said baffle plate, thereby providing substantially diffused flame for enhanced heating of said sleeve
Implementation Method 2
The compressive forces are primarily created by heating and subsequently cooling these sleeves, when mounted on the pipe being repaired
Implementation Method 3
obtain a certain temperature profile between sleeve and pipe to achieve adequate differential expansion of the sleeve relative to the pipe
Data Source
AI summary
A heater of an external tubular sleeve for repairing a longitudinal section of defective hollow pipe has a frame for encompassing the sleeve when operationally positioned. Each of several burners spaced at intervals about the frame as nozzle for heating the sleeve, and a novel baffle located intermediate the nozzle and sleeve when operationally positioned, for heat dispersal over the sleeve. Each baffle has staggered vents for passing flame from the nozzle onto the sleeve, to avoid cold spots on the sleeve below the baffle, and has a central shaped deflector proximate the vents and facing the nozzle. Flame from the nozzle impacts the deflector and redirects toward the vents and periphery, of the baffle, to avoid point heating below the nozzle and provide diffused flame uniformly over the sleeve. Changing deflector and vent features can influence desired flame dispersal characteristics.