DH1S Danmuff
metal expansion joints

DH1S Danmuff
metal expansion joints

DH1S Danmuff<br/>
metal expansion joints
Item Description
1 Bellows
2 Outer casing / shroud
3 Internal liner
4 Cone section
5 Stop ring
6 Guide ring
7 Torsion protector
8 Media / line pipe

DH1S Danmuff
metal expansion joints

Features

  • Untied metal expansion joints mainly for district heating applications.
  • External shroud with torsion protection, for district heating.
  • Can be installed in series.
  • Designed for large axial movements.

Advantages

  • No significant pressure drop - reduced need for pumps and general power consumption for moving media, compared to pipe loops.
  • Less space required around the joint - compared to pipe loops.
  • Less supporting structure required – compared to pipe loops.
  • Lower erosion rate (for abrasive media lines – compared to pipe loops with elbows).
  • Multiply bellows with low spring rate and high cycle life.

Operating range

Diameter: DN 40 ... DN 600 (1.75" ... 24”)
Temperature: ... 120 °C (248 °F)
Pressure: 16 barg (232 PSIG), 25 barg (362 PSIG)

Materials

  • Bellows: 1.4541 (AISI 321)
  • Connections: 1.0345 – (P235GH)


Other materials are available on request.

Standards and approvals

Design code:
EJMA, 1,000 Cycles


NDT and documentation:
Can be provided per customer request e.g.,
material certificates and NDT test reports.

Notes

Custom designs and sizes are available on request. Untied metal expansion joints require guide and support. DH type expansion joints are delivered 100 % preset (extended) using shear bolts, which are activated during startup / first cycle.

Similar products

AN Type expansion joints

  • Tied custom metal expansion joints for general pressure applications.
  • Designed for, and cover the mid temperature and pressure range for general process equipment.
  • Mainly for angular movements.
  • Tied metal expansion joints retain pressure thrust developed by internal pressure, through the use of hardware.

AX Type expansion joints

  • Untied custom metal expansion joints for general pressure applications.
  • Designed to cover the mid temperature and pressure range for general process equipment.
  • Mainly intended for axial movements.
  • Multiply bellows with low spring rate and high cycle life.

CB Clamshell metal expansion joints

  • Bellows or expansion joints split into longitudinal segments for installation without opening pipework.
  • Temporary repair solution for damaged expansion joints.
  • Can handle axial, lateral and angular movements.
  • The permissible combination and magnitude of movements depends on the application and the existing expansion joint that is to be repaired.
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