Besides standard research articles, EJM publishes several other types of contributions, each with its own guidelines:
Unlike a rigid pipe, a bellows acts like a balloon; under pressure, it wants to stretch lengthwise. The force generated (Thrust = Pressure × Effective Area) can be immense. If an unrestrained expansion joint is installed in a pipe without anchors, this force can destroy piping supports or damage connected equipment.
Today, the EJMA Standards are for safe and reliable piping and vessel installation. They represent the combined knowledge and experience of the association's Technical Committee.
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A well-designed bellows must be well-built. This section provides:
The EJMA Standard, particularly the 11th Edition, is the authoritative guide for the design, selection, and application of metallic bellows-type expansion joints. Covering crucial engineering calculations for pressure, thermal movements, and fatigue life, the standard ensures safety in piping networks, with current editions transitioning to a cloud-based format. For more information, visit EJMA . Share public link
Unlike generic piping codes (such as ASME B31.3), the EJMA Standard specifically addresses the unique behaviors of bellows: their flexibility, fatigue life, instability modes (column squirm, in-plane squirm, and torsional squirm), and cycle life under pressure and movement.
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