STY Styrene
expansion joints

STY Styrene <br/>
expansion joints For a larger view, please mouseover the image.
  • Heavy duty expansion joints for extremely high temperature, high pressure and high movement applications.
  • Used in styrene units.
  • Shell wall temperatures
    up to about 900 °C (1,650 °F).
  • Reliable expansion joints in critical applications.
  • Experience in styrene business.
  • Experience with Badger, Shaw Stone & Webster, Technip styrene specifications.
Diameter: Up to 2,250 mm (90”)
Process temperature: Up to 900 °C (1,650 °F)
Pressure: Up to 6 bar (90 PSI)
Typical axial movement: ±50 mm (+/-2”)
Typical lateral movement: 50 mm (2”)
Typical angular movement: 5°

Movements are concurrent.
  • Inconel© 800H restricted chemistry nickel alloy is a typical bellows material.
  • Bellows basics: formed by punch mandrel, thin-wall ply thickness ≤1.5 mm (0.060”).
  • Duct: 304H, 800H or 800HT, 12 ... 50 mm (0.5 ... 2”).
  • 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
  • Steam
  • Expansion joints in Styrene units with extremely high temperatures.
  • Petrochemical applications with extremely high process temperatures.
  • Any application with extremely high internal temperatures.
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.
  • Hydrotest
  • Third-party inspection

Additional quality control and testing options:
  • Ultrasound weld tests
  • Helium leak check
  • Impact testing of weld ends

  • 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.