Triple-Shell Tank Step Alignment for Smooth Construction Access
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Solution Overview
Problem
The construction of triple shell tanks for low temperature liquefied gas storage faces challenges in workability due to height differences between the inner, intermediate, and outer tanks, leading to steps at construction openings that disrupt smooth work implementation.
Innovation Solution
The triple shell tank design includes an intermediate tank side plate piece for height adjustment to align the lowermost step with the inner tank, and the outer tank side plate pieces are positioned to match the same height, allowing seamless construction openings without steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the intermediate tank side plate is assembled with circular steps to cover the inner tank, then the intermediate tank can be constructed in parallel with the inner tank, but a height difference occurs between the bottom plates of adjacent tanks causing steps between construction openings
Solution Approach 1:
The intermediate tank side plate is divided into multiple circular steps (first step, second step, third step) arranged vertically. Each step corresponds to a different height position, allowing the side plate to accommodate the height difference between the inner tank bottom plate and intermediate tank bottom plate while maintaining parallel construction capability.
Solution Approach 2:
The side plate assembly transitions from a single-plane structure to a multi-level vertical arrangement. By stacking circular steps at different height positions, the design resolves the height difference issue in the vertical dimension while maintaining horizontal alignment for construction openings.
2Ease of operation
If construction openings are opened by removing side plate pieces, then access for construction materials and equipment is enabled, but steps may occur between adjacent construction openings interrupting smooth work
Solution Approach 1:
The side plate pieces are pre-positioned at specific height positions before construction begins. The first, second, and third circular steps are arranged in advance to correspond with the height differences between tanks, ensuring that when side plate pieces are removed to create construction openings, the openings are already aligned at the same height level.
Solution Approach 2:
The circular steps are designed to create equipotential height levels for construction openings. By positioning the first, second, and third steps at different height positions that correspond to the bottom plate heights of adjacent tanks, all construction openings are formed at the same elevation, eliminating steps and ensuring smooth work implementation.
Data Source
AI summary
A triple shell tank includes an inner tank, an intermediate tank covering the inner tank, and an outer tank covering the intermediate tank. The inner tank includes an inner tank side plate, an inner tank roof, and an inner tank bottom plate. The intermediate tank includes an intermediate tank side plate, an intermediate tank roof, and an intermediate tank bottom plate. The circular steps of the intermediate tank side plate include a lowermost step formed of an intermediate tank side plate piece for height adjustment having a height corresponding to a height difference between the inner tank bottom plate and the intermediate tank bottom plate, and a second step on the lowermost step formed of an intermediate tank side plate piece arranged at a same height position as an inner tank side plate piece of a lowermost step in the circular steps of the inner tank side plate.