Floating Roof Panel Welding Guide Troughs
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Solution Overview
Problem
Existing sealed floating roofs for storage tanks face issues with weld seam degradation and potential leakage due to exposure to stored fluids, which can lead to product loss and require frequent repairs.
Innovation Solution
The design incorporates a roof panel with a panel component that includes a top sheet and a pan-shaped bottom sheet coupled to frame segments, with welds positioned on the exterior surface to prevent exposure to the fluid, using an automatic welder guided by depressions in the frame segments to form a sealed and structurally rigid floating roof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weld seams are exposed to the fluid within the tank to form a sealed floating roof, then the sealing effectiveness is improved, but the weld seams degrade over time resulting in leakage points
Solution Approach 1:
The floating roof is divided into multiple roof panels with frame segments, where the frame segments are separated into those exposed to fluid (lower frame extensions) and those not exposed (upper lips). This segmentation allows the weld seams to be positioned on non-exposed portions, isolating them from fluid degradation while maintaining sealing effectiveness through the coordinated arrangement of multiple segments.
Solution Approach 2:
The weld seams are repositioned from the traditional horizontal configuration (exposed to fluid) to a vertical configuration on the upper lips of frame segments. This dimensional change moves the weld seams out of the fluid exposure zone while maintaining their structural and sealing function through the three-dimensional arrangement of the frame segments and panel components.
2Duration of action of stationary object
If weld seams are isolated from the fluid by positioning them on the exterior surface, then the weld lifespan is increased, but the sealing effectiveness may be compromised
Solution Approach 1:
The sealing function is merged across multiple components: the panel component itself provides a seal, the adjacent roof panels form continuous barriers, and the walled troughs created by depressions provide additional sealing pathways. This distributed sealing system ensures that even though individual weld seams are isolated from fluid, the overall sealing effectiveness is maintained through the combined action of multiple sealed paths.
Solution Approach 2:
The upper lips of the frame segments act as intermediary elements that carry the weld seams away from fluid exposure while maintaining the seal. These intermediary structures transmit the sealing function from the fluid-exposed lower portions to the non-exposed upper portions, allowing weld isolation without compromising sealing effectiveness.
3Strength
If multiple roof panels with frame segments are assembled to form a floating roof, then the structural rigidity is enhanced, but the assembly complexity increases
Solution Approach 1:
The frame segments and panel components are pre-configured with integrated depression features and upper lip structures during manufacturing. This preliminary action incorporates the sealing and structural features into the basic components, eliminating the need for complex field assembly operations and reducing overall assembly complexity while maintaining structural rigidity.
Solution Approach 2:
The frame segments are designed as universal components that simultaneously provide structural support, create sealed pathways through their depression features, and position weld seams on upper lips for fluid isolation. This multi-functionality reduces the number of separate components needed, simplifying assembly while enhancing structural rigidity through integrated design.
Data Source
AI summary
A roof panel of a sealed floating roof for a storage tank includes a first frame segment and a second frame segment. Each of the first and second frame segments includes a first depression configured to abut an adjacent top depression of a respective frame segment of a respective adjacent roof panel to form a walled trough to guide an automatic welder along a weld joint during a welding process. The roof panel also includes a panel component. The panel component includes a top sheet and a pan-shaped bottom sheet coupled to the top sheet. The pan-shaped bottom sheet is coupled to a respective upper lip of each of the first and second frame segments.