Corrosion Resistant Nozzle with Diffuser Coating
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Solution Overview
Problem
Fire protection system nozzles in corrosive environments, such as duct systems, face corrosion issues due to exposure to high concentrations of inorganic acids and abrasive particles, leading to operational and performance reliability problems.
Innovation Solution
A corrosion-resistant nozzle design featuring a diffuser with a splitter and imperforated deflector, coated with polymers like ethylene-chlorotrifluoroethylene, which enhances the corrosion protection and maintains the nozzle's functionality by dispersing fire-fighting fluid effectively within a corrosive environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective coating is applied to the nozzle, then corrosion resistance is improved, but the coating may fail to maintain integrity without proper geometric support
Solution Approach 1:
The nozzle incorporates specific geometric features (rounded corners, radii, and surface profiles) at critical locations where the protective coating is most vulnerable. These localized geometric modifications ensure proper coating adhesion and integrity without requiring complete redesign of the entire nozzle structure.
Solution Approach 2:
The solution combines the protective coating material with the nozzle substrate material in a composite structure. The geometric features are designed to ensure proper bonding between the coating and substrate, creating a composite system that leverages the corrosion resistance of the coating while maintaining the structural integrity of the nozzle material.
2Reliability
If the nozzle geometry is modified to support protective coating, then coating integrity is improved, but spray pattern performance may be affected
Solution Approach 1:
Geometric modifications such as rounded corners and specific radii are applied only to non-critical surfaces where the protective coating needs support. The spray-critical surfaces maintain their precise original geometry to ensure proper spray pattern performance while still providing adequate coating support through localized geometric features.
Data Source
AI summary
A coated corrosion-resistant nozzle with a diffuser configured to support a coating and a coating that, together, inhibit functionally-debilitating corrosion of the nozzle for a desirable period of time within a corrosive environment. The diffuser includes exterior surfaces configured to enhance the corrosion-resistance properties of the coating to extend the duration of the corrosion protection provided to the nozzle by the coating.