UM Type
expansion joints

UM Type <br/>
expansion joints For a larger view, please mouseover the image.
For a larger view, please mouseover the image.
Item Description
1 V-Clamp flange
2 Bellows
3 Flange
4 Pipe
5 Internal liner
  • Customized for flue gas applications, designed for engine exhaust systems.
  • Located in the engine exhaust system, in mainly two areas. The flue gas line between the engine and the turbo charger, and on the charger air lines.
  • Designed for, and operate at high temperatures, where vibrations are present and pressure impulses occur.
  • Highly customizable design: Bellows geometry, material options and combinations
  • Multiply bellows with low spring rate and high cycle life


With loose/ swivel flange connection:
  • Easy installation, flanges can be rotated
  • Flanges are not in contact with medium, which enables lower grade material
  • Connection with non weldable materials possible
  • Galvanic surfaces/ coatings possible
  • Gaskets can often be eliminated
Diameter: DN 40 ... DN 1,200 (1.5" ... 50”)
Temperature: ... 900 °C (1,652 °F)
Pressure: max. 16 barg (232 PSI)
  • Weld ends: 1.0038 - S235JRG2; 1.0425 - P265GH; 1.0254 - P235TR1; 1.0345 - P235GH; 1.5415 (16Mo3) ; 1.4404 (AISI 316L); 1.4436 (AISI 316)
  • Bellows: 1.4541 (AISI 321); 1.4301 (AISI 304); 1.4306 (AISI 304L); 1.4401 (AISI 316); 1.4436 (AISI 316); 1.4404 (AISI 316L); 1.4435 (AISI 316L); 1.4571 (AISI 316Ti); 1.4828 (AISI 309)
  • Flanges: 1.0038 - S235JRG2; 1.0425 - P265GH; 1.0315 - P235G2TH; 1.0254 (P235TR1); 1.0425 - P265GH; 1.5415 - 16Mo3; 1.4404 (AISI 316L); 1.4436 (AISI 316)


Other materials are available on request.
Design codes and options:
Bellows: EJMA 9, EN14917, EN13480, EN13445, ASME B31.3

NDT and documentation:
EagleBurgmann EJ holds type approvals for a range of UM type metal expansion joints, covering e.g. steel ships / marine / offshore units. Furthermore, an Individual design approval can be a possibility for joints in excess of specific type approvals.
  • Power plant technology
  • Shipbuilding
  • Engine exhaust systems