Ejma Standard.pdf May 2026

The EJMA (Expansion Joint Manufacturers Association) 11th Edition standards, released for 2024/2025, serve as the definitive global guidelines for designing and applying metallic bellows-type expansion joints. The updated standard, which is now an online-exclusive subscription, focuses on enhanced membrane stress equations and harmonized fatigue life calculations to ensure piping system safety. For more information on the updated 11th Edition, visit Belman A/S - Facebook Jun 4, 2568 BE —

  1. Power generation: The standard is used in the design and fabrication of expansion joints for power generation equipment, such as steam turbines and piping systems.
  2. Chemical processing: The standard is used in the design and fabrication of expansion joints for chemical processing equipment, such as reactors, heat exchangers, and piping systems.
  3. Oil and gas: The standard is used in the design and fabrication of expansion joints for oil and gas equipment, such as pipelines, process equipment, and storage tanks.

Scenario: You are designing a 24-inch steam line operating at 300 psi and 750°F. The line experiences 4 inches of axial thermal growth at a specific pump discharge. Ejma Standard.pdf

  • Tolerances for overall length, squareness, and concentricity.
  • Requirements for shop testing (hydrostatic, pneumatic, or leakage).
  • Material traceability and welding standards.

The EJMA (Expansion Joint Manufacturers Association) 11th Edition standards, released for 2024/2025, serve as the definitive global guidelines for designing and applying metallic bellows-type expansion joints. The updated standard, which is now an online-exclusive subscription, focuses on enhanced membrane stress equations and harmonized fatigue life calculations to ensure piping system safety. For more information on the updated 11th Edition, visit Belman A/S - Facebook Jun 4, 2568 BE —

  1. Power generation: The standard is used in the design and fabrication of expansion joints for power generation equipment, such as steam turbines and piping systems.
  2. Chemical processing: The standard is used in the design and fabrication of expansion joints for chemical processing equipment, such as reactors, heat exchangers, and piping systems.
  3. Oil and gas: The standard is used in the design and fabrication of expansion joints for oil and gas equipment, such as pipelines, process equipment, and storage tanks.

Scenario: You are designing a 24-inch steam line operating at 300 psi and 750°F. The line experiences 4 inches of axial thermal growth at a specific pump discharge.

  • Tolerances for overall length, squareness, and concentricity.
  • Requirements for shop testing (hydrostatic, pneumatic, or leakage).
  • Material traceability and welding standards.