XP Expansion Joint

Externally Pressurized Expansion Joint
  • Used for long axial movements
  • Self Draining Convolutions
  • Integral cover and liner
  • Packless
  • Typically used steam distribution systems and LNG applications
  • They can be buried or above ground
  • Piping must be properly anchored and guided. Intermediate anchors are required between xpress expansion joints.
Operating Range
  • Full vacuum to 2000 psig depending on size
  • Cryogenic to 1650°F+
  • Sizes from 1” NPS to > 240” NPS


  • 3XX Series Stainless Steel
  • Nickel Alloys
  • Carbon Steel
  • Titanium
  • Zirconium
  • Bellows may be attached or linked to piping flanges, pipe, or other typical industrial connections.
  • End connections may conform to standards such as ASME B16.5, ASME B36.10, or customer designed.
  • Fittings may be the same at each end or different.
  • Single circular metal bellows, or 1 or more convolutions.
  • System pressure is applied to only the outside surface of the bellows.
  • Typical dimensions of 2” ANSINPS
    to 100” ID. Overall length may vary, typically within the range of 26” to 120”.
  • Bellows may include reinforcement or controlling members.
  • Convolutions are U shaped.
  • Additional accessories maybe incorporated such as drains, anchor load bearing restraints.
  • Absorbs piping (thermal) movement, primarily axial but may include small lateral and/or angular movements.
  • Movement amplitude varies, typically within the range of 3” to 16”.
  • Movement frequency may be extreme low cycle (1 per year), or high cyclic (such as vibration at 60 Hz).