DH1S Danmuff metal expansion joints

These untied metal expansion joints provide torsion protection and are designed for large axial movements, making them useful for district heating applications. 

Product Description

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.
Benefits:
  • 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.
 
ITEMDESCRIPTION
1Bellows
2Outer casing / shroud
3Internal liner
4Cone section
5Stop ring
6Guide ring
7Torsion protector
8Media / line pipe

Technical Specifications

Operating range:

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

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.

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.