Venturi Flow Meter Tube Wear-Resistant Coating
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Solution Overview
Problem
Venturi flow meters used for erosive fluids suffer from inaccurate measurements due to wear and shape changes caused by thick, rough weld overlay coatings, which are applied to enhance wear resistance but result in non-uniform wear and altered dimensions.
Innovation Solution
A venturi flow meter with a thin, smooth internal coating of a wear-resistant material, such as Conforma Clad WC 200, having a surface roughness of ≤250 microinches rms and Rockwell C hardness of 56 to 70, applied using autogenous metallurgical bonding, providing improved abrasion and erosion resistance with a thickness of 0.015 to 0.120 inch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a thick weld overlay coating is applied to increase wear resistance, then the wear lifetime is improved, but the surface becomes rough and measurement accuracy deteriorates
Solution Approach 1:
The invention changes the surface roughness parameter by using a smooth coating application method instead of traditional weld overlay, achieving both adequate wear resistance and accurate flow measurement by controlling the surface finish parameter
Solution Approach 2:
The invention uses a composite coating material that combines wear-resistant properties with smooth surface finish, creating a multi-functional layer that provides both protection and measurement accuracy
2Duration of action of stationary object
If a thick weld overlay coating is applied to improve wear resistance, then the coating lifetime is extended, but the coating surface becomes non-uniform and measurement accuracy deteriorates
Solution Approach 1:
The invention controls the coating thickness parameter within a specific range (0.002 to 0.060 inch) and maintains surface roughness below 250 microinches rms, achieving both adequate lifetime and uniform surface finish through parameter optimization
Solution Approach 2:
The invention replaces the mechanical weld overlay process with a chemical or physical coating process that produces a uniform, smooth surface without the bumpy texture caused by weld beads
3Object-affected harmful factors
If a rough weld overlay coating is applied to increase wear resistance, then the erosion resistance is improved, but the surface roughness increases and measurement accuracy deteriorates
Solution Approach 1:
The invention optimizes the surface roughness parameter to be less than 250 microinches rms while maintaining adequate erosion resistance through controlled coating thickness and material composition, resolving the contradiction between protection and measurement accuracy
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 ensures accurate flow rate measurements by minimizing wear and maintaining the venturi's shape integrity, with reduced erosion rate and uniform wear, enhancing the durability and precision of flow metering in erosive environments.
Implementation Method 1
The coating has an abrasion resistance factor of at least 100 and more preferably at least 140 (1/volume loss (cm3) (ASTM G65)).
Implementation Method 2
The coating has an erosion rate of 0.041 mm3/g or less and more preferably 0.025 mm3/g or less (per ASTM G76).
Data Source
AI summary
A flow meter tube is provided having improved performance in the measurement of the flow rate of erosive material. The internal wall surface of the flow meter tube has a smooth erosion-resistant coating thereon to protect the flow meter wall from erosion by the erosive fluid flowing there through. The coating has a Rockwell C hardness of 56 to 70 and a surface roughness of less than or equal to 250 microinches rms.