Knowledge Series - Chapter 2F Turbulence Reduction

Knowledge Series: Designs for Reduction of Turbulence & Abrasion

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Designs for Reduction of Turbulence & Abrasion • The open-arch design of the Standard Spool Type Expansion Joint may be modified to reduce possible turbulence and to prevent the collection of solid materials that may settle from the solution handled and remain in the archway.

• Included in this section: • Filled Arch Type • “Top Hat” Liner

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Filled Arch Type • Filled Arch Type Rubber Expansion joints: • Provided with soft rubber arch bonded internally to the expansion joint • Smooth bore reduces turbulence of media and prevents build up in comparison to the standard “open arch” • Movements of filled arch expansion joints are 50% of the size equivalent “open arch” designs • Spring rates of filled arch expansion joints are typically 4X that of an open arch expansion joint

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Filled Arch Type • Open Arch vs. Filled Arch Movement & Spring Rate Comparison

Open Arch Expansion Joint

Filled Arch Expansion Joint

“Top Hat” Liner • “Top Hat” Liner Type Rubber Expansion joints: • Sleeve extending through the bore of the expansion joint • Generally made from metal, hard rubber or fluoroplastic • Ideal for applications with high flow rate and/or abrasive media • Not recommended for use with high-viscosity media

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Designs for Reduction of Turbulence & Abrasion For additional technical information regarding rubber expansion joint and reduction of turbulence & abrasion as well as other rubber expansion joint designs consult the Fluid Sealing Associations Technical Handbook for Expansion Joints Piping (https://www.fluidsealing.com/)