Knowledge Series:
Reducer or Tapered Expansion Joints
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• Tapered Expansion Joint Basics
• Configurations of Tapered Expansion Joints
• Concentric Taper
• Eccentric Taper
Reducer Type Basics
• Joins pipe sections of unequal diameter
• Maximum allowed angle of taper varies – consult with manufacturer
• Use large side diameter for design pressure rating
Reducer Type Basics
Maximum allowed Taper Angle fundamentals:
• Taper angle is a function of the Large I.D., Small I.D. and the face to face (f/f)
• Extreme angels could result in the following:
• Decrease Performance Life
• Bolt Head Interference
• Poor Cosmetic Quality
Taper Configurations
Tapered Configurations:
• Concentric Taper – refers to pipe diameters that share the same axis
• Typically located on the discharge side of pump(s)
• Eccentric Taper – refers to pipe diameters axis that are offset from each other
• Typically located on the suction side of pump(s) to alleviated cavitation
For additional technical information regarding Arch Type rubber expansion joints as well as other rubber expansion joint designs consult the Fluid Sealing Associations Technical Handbook for Expansion Joints Piping (https://www.fluidsealing.com/)
