Marine Water Lead-Through Module Corrosion Resistance
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Solution Overview
Problem
The discharge of corrosive exhaust gas scrubbing water through a marine vessel's hull poses challenges due to the corrosive nature of sea water and the need for effective corrosion resistance and safe operation, especially in two-stage or multi-stage scrubber units.
Innovation Solution
A water lead-through module comprising a flow tube made of high-alloy austenitic stainless steel and a planar transition plate of Grade A steel, both rigidly connected and arranged to ensure axial flushness, with a sealed housing and leak detection, to enhance corrosion resistance and safety during discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow tube made of high-alloy austenitic stainless steel is used, then corrosion resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies different steel grades to different components based on their specific corrosion exposure. The flow tube contacting corrosive scrubbing water uses high-alloy austenitic stainless steel (first grade), while the transition plate not directly contacting water uses Grade A steel (second grade). This local differentiation optimizes corrosion resistance where needed while reducing overall manufacturing cost.
Solution Approach 2:
The lead-through module combines two different steel materials (high-alloy austenitic stainless steel and Grade A steel) in a composite structure. This allows the system to leverage the superior corrosion resistance of premium steel where required while using more economical steel elsewhere, achieving a cost-effective balance between reliability and manufacturing expense.
2Strength
If a transition plate is rigidly connected to the outlet flange part, then structural integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The transition plate is divided into multiple segments corresponding to different steel grades. This segmentation allows each portion to be manufactured separately with appropriate material properties, then assembled through rigid connection to achieve overall structural integrity while simplifying the manufacturing of individual components.
Solution Approach 2:
Different regions of the transition plate structure use different steel grades matched to their functional requirements. The portion requiring highest strength and corrosion resistance uses first grade steel, while other portions use second grade steel, optimizing the balance between structural integrity and manufacturing complexity.
Data Source
AI summary
A water lead-through module is disclosed for discharging water into the sea through a hull of a marine vessel provided with a flow tube having a first end and a second end. The flow tube is of first grade steel, having an attachment flange part at the first end of the flow tube, and an outlet flange part at the second end of the flow tube extending radially outwards. A planar transition plate of a second grade steel has an outer periphery and includes an opening defining an inner periphery which conforms with an outer periphery of the outlet flange part, and wherein the transition plate is arranged axially flush with, rigidly connected to, by welding, the outlet flange part of the flow tube.