Visit our Learning Center to optimize your understanding of biomass conversion and air handling  Click Here
Metal Expansion Joint
Centrifugal Dust Collector
Expansion Joint Display

Metal Expansion Joints

Metallic expansion joints are used in a variety of applications and industries, including ID and FD fans, ductwork, stacks, baghouses, precipitators, and scrubbers.

ProcessBarron’s metal expansion joints are supplied in round, square, and rectangular configurations to accommodate for axial and lateral movements in flue gas and process duct systems.

These joints can be manufactured from various materials to accommodate for more corrosive or high-temperature environments.

Handle Your Own

Access articles about the latest techniques in air, ash, and fuel handling in our dedicated Learning Center.

Metal Expansion Joint Fabrication

Metal expansion joints are produced with standard angle, bar, or pip flanges to match the specified connecting duct. Additionally, axial, lateral (x and y direction) spring rates, and cycle life data are available for each expansion joint.

Metal Expansion Joint Construction:

  • Design: Rectangular duct expansion joints are designed in accordance with the Expansion Joint Manufacturers Association (EJMA). This ensures compensation for thermal expansion in duct systems to precipitators, scrubbers, turbines, boiler breeching, and other gas systems.
  • Pressure: Type A expansion joints are designed for /-100” water gauge pressure, maximum temperature of 1000˚F. Type B expansion joints are designed for service from full vacuum to 15 PSIG at a maximum temperature of 1000˚F.
  • Movements: ProcessBarron can furnish a design for any combination of axial, lateral, or angular movement per customer specification.
  • Bellows: Rectangular bellows are die formed from .050" thick, deep-drawn, quality annealed sheet conforming to ASTM specifications, available in two standard designs.
  • Liners: Internal liners should be specified when flow velocity exceeds 25 FPS or where abrasive particles in the gas stream could cause erosion of bellows.


  • Single Miter Corner: the most economical design for most applications, available on Type A or B expansion joints
  • Camera Corner: additional flexibility for duct systems that operate under more cyclical conditions, available on Type A expansion joints
  • Round Corner: maximum flexibility and pressure capacity, available on Type B expansion joints

Contact ProcessBarron's Expansion Joints Division today to learn more about our metal expansion joint fabrication capabilities, or to request emergency field service assistance. Technical experts are available for field inspection and evaluation services, complete field installation, temporary joint repair and splicing, and turn-key installation. 

For time-critical projects, our emergency repair services can quickly repair damaged fans and process equipment.  Call for emergency repair: 800-226-3267.

Our qualified expansion joint engineering and service teams are eager to earn your business and help you maintain an efficient operation.