FCCUH Hot wall
expansion joints

FCCUH Hot wall <br/>
expansion joints For a larger view, please mouseover the image.
For a larger view, please mouseover the image.
Typical hot wall UOP cross section

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 Abrasion resistant lining
10 Hex mesh
11 Braided hose clip
12 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
    up to about 600 °C (1,100 °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 3,750 mm (150”)
Process temperature: Up to 800° C (1,475 °F)
Pressure: Up to 7 bar (105 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: Chrome-Moly
    Post weld heat treatment of ducting required.
    Inco 8L weld inlay for bellows attachment required.
    Abrasion-resistant lining, 19 .. 25 mm (0.75 .. 1”) thick.
  • 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 chrome-moly (higher temperature) piping.
  • Petrochemical applications with large movements, high process temperatures and chrome-moly (higher temperature) piping.
  • Application with large movements, high internal temperatures and chrome-moly piping.
MEJ's 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.