FCCUC Cold wall
expansion joints

FCCUC Cold wall <br/>
expansion joints For a larger view, please mouseover the image.
For a larger view, please mouseover the image.
Typical cross-section of bellows

Item Description
1 Bellows - 1 ply or 2 ply testable
2 External insulation
3 Telescoping cover
4 Band clip
5 Band
6 Test port tube
7 Threaded elbow
8 Loose insulation
9 Thermal refractory
10 V-anchor
11 Abrasion resistant lining
12 Anchor bar
13 Hex mesh
14 Internal insulation
15 Braided hose clip
16 Braid seal
  • Heavy duty expansion joints for high temperature, high pressure and high movement applications.
  • Withstand abrasive media like powder catalyst entrained in hydrocarbon flow.
  • Used in fluidized catalytic cracker units (FCCU’s).
  • Shell wall temperatures do not exceed 340 °C (650 °F)
  • Reliable expansion joints in critical applications.
  • UOP approval
  • Extensive experience in FCCU business.
  • Experience with BP, ExxonMobil, KBR, Lummus, Shell, Total and Valero FCC specifications.
Diameter: Up to 4,250 mm (170”)
Process temperature: Up to 900° C (1,650 °F)
Pressure: Up to 8 bar (120 PSI)
Typical axial movement: ±175 mm (±7”)
Typical lateral movement: 125 mm (5”)
Typical angular movement: 1°

Movements are concurrent.
  • Bellows material: Inconel© 625 LCF (low cycle fatigue) nickel alloy is a typical bellows material. Other materials on request.
  • Bellows basics: formed by punch mandrel, thin-wall ply thickness ≤1.5 mm (0.060”)
  • Duct: A516 GR.70, 12 ... 16 mm (0.5 ... 0.625”) High-density vibrocast refractory material, 100 … 200 mm (4… 8”) thick with ANSI 304 anchors.
  • UOP recommended manufacturer
  • B31.3 process piping
  • European Pressure Equipment Directive (PED) 97/23/CE
  • Expansion Joint Manufacturers Association (EJMA)
  • ISO 9001:2008
  • Petrochemical industry
  • Refining technology
  • Chemical industry
  • Process industry
  • Hydrocarbon gases
  • FCCU applications with carbon steel (lower temperature) piping
  • Petrochemical applications with large movements, high process temperatures and carbon steel (lower temperature) piping
  • Applications with large movements, high internal temperatures and carbon steel piping
Metal expansion joints are used in pipelines to compensate for thermal growth, typically in applications with high internal temperatures; or to prevent vibrations from being transmitted beyond the expansion joint.
Standard quality control and testing:
  • Full x-ray of bellows longitudinal seam weld before formation of convolutions.
  • Full dye penetrant test of bellows longitudinal seam weld inside and outside before and after forming of convolutions.
  • 100 % dye penetrant test of bellows attachment welds.
  • Pneumatic test
  • Third-party inspection

Additional quality control and testing options:
  • Ultrasound weld tests
  • Helium leak check
  • Impact testing of weld ends
  • Hardness test
  • Magnetic particle examination
  • Positive material identification

  • Skilled field service teams can provide site support.
  • Expert clamshell (split bellows, for in situ repair) bellows welders.
  • Experienced supervision by our field service personnel available.