DH1S Danmuff
metal expansion joints
DH1S Danmuff
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.
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.
EJMA, 1,000 Cycles
NDT and documentation:
Can be provided per customer request e.g.,
material certificates and NDT test reports.
Recommended applications
- Power plant technology
- Building services industry
- District heating & cooling
- Water cooling systems
- Air and steam transport lines
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.