Dual Expansion Joints

Overview

Dual expansion joints, also referred to as double gimbal expansion joints, consist of two single gimbal expansion joints connected by an intermediate pipe. This configuration allows the system to absorb large lateral movements in any plane while maintaining controlled and balanced motion within the piping system.

Design & Construction

• Two single gimbal expansion joints connected by an intermediate pipe (common connector)
• Intermediate anchor positioned at the center of the connector
• Available with or without an anchor support base, depending on customer requirements
• Designed to distribute movement evenly between both bellows

Working Principle

• The intermediate anchor divides the total movement between the two bellows
• Each bellows absorbs its proportional share of lateral movement
• This division reduces stress on individual bellows and extends service life

Performance Characteristics

• Absorbs large lateral movements that exceed the capacity of single expansion joints
• Allows lateral movement in any plane
• Improves system stability by balancing movement and loads
• Reduces excessive forces on piping, anchors, and equipment

Installation Characteristics

• Typically installed in the middle of a pipe run
• Both ends are exposed to equal movement conditions
• Bellows on both sides usually have the same number of corrugations
• Intermediate anchor is fixed to a rigid structural element

Applications

• Piping systems with large lateral movement requirements
• Power plants and energy facilities
• Petrochemical and chemical processing plants
• Industrial piping networks with thermal expansion challenges
• Systems where single expansion joints are insufficient

Key Advantages

• Handles greater movement capacity than single expansion joints
• Balanced load distribution across multiple bellows
• Extended service life due to reduced stress concentration
• Flexible design options with or without anchor support base
• Improves overall piping system reliability and safety