DISTRICT HEATING EXPANSION JOINTS

District heating pipelines are mainly exposed to temperature expansions caused by temperature fluctuations as a result of a system start-up
or predisposed operating conditions. Depending on the purpose district heating expansion joints can be divided into two main categories:

  • District heating expansion joints for multiple usage
  • One-step expansion joints

Both types are specifically developed for district heating applications and are suitable for ground-surface and underground pipeline systems. Belman offers standard as well as customised solutions.

DIMENSION & DESIGN

District heating expansion joints are available in sizes DN 80 – 1200 in all materials.
Other sizes and designs are designed and manufactured as cost-efficient customised solutions based on customer specifications
and drawings.

DISTRICT HEATING EXPANSION JOINT PROJECTS

DISTRICT HEATING EXPANSION JOINTS

District heating pipeline, Latvia

258 SIMILAR EXPANSION JOINTS

District heating pipeline, Poland

DISTRICT HEATING EXPANSION JOINTS

District heating pipeline, Latvia

258 SIMILAR EXPANSION JOINTS

District heating pipeline, Poland

CUSTOMISED DESIGN FOR CONCRETE SHAFT

District heating pipeline, Korea

DOUBLE EXPANSION JOINT

District heating pipeline, Latvia

CUSTOMISED DESIGN FOR CONCRETE SHAFT

District heating pipeline, Korea

DOUBLE EXPANSION JOINT

District heating pipeline, Latvia

EXCELLENCE IN

DISTRICT HEATING EXPANSION JOINT
ENGINEERING

TECHNICAL DESCRIPTION

District heating expansion joints are designed to take up mainly axial movements caused by temperature expansions of the pipeline. The expansion joints are suitable for both trenched/trenchless pipelines, are reliable in operation and do not require any maintenance.
A highly flexible bellow is a main component of the expansion joint, ensuring compensation of large axial movements. A solid casing and guides/rings mounted on the expansion joints serves multiple functions for example; the protection of the bellows from mechanical damages, higher bellow stability and the absorption of eventual misalignments in the pipeline. An inner sleeve protects the bellows against internal abrasives such as sand and dirt particles which are often carried by district heating water, settling between the convolutions which can prevent the bellows from their intended function. Furthermore, the expansion joints have a safeguard preventing torsion on the bellows and other unintended loads, and thus ensuring a longer service life.
The basic design can be additionally reinforced, so the expansion joints would be able to absorb additional loads coming from the pipeline. Consequently this will result in the saving of the first guide supporting the pipeline, normally placed at 4 x DN from the expansion joint to a distance of 10 x DN. The reinforcement is obtained through a more solid construction, more specifically the casing and inner sleeve.

ADVANTAGES & APPLICATION

Advantages

  • Prevention of torsion
  • Pre-stressed
  • Suitable for insulation
  • Safety and reliability of operation
  • Maintenance free

 

Application
The district heating expansion joints are specially developed for district heating systems and power plants.
These expansion joints are suitable for ground-surface and underground pipeline systems.

Installation &
REMOTE LEAKAGE MONITORING

District heating expansion joints are suitable for pre-insulated pipes – meaning that insulation foam is applied directly on the expansion joint’s cover and covered by an additional layer of plastic. Insulated expansion joints are available on request.
Pre-insulated expansion joints are normally provided with leak indicator for the timely detection of any leakages, allowing remedial action to be quickly taken.

District Heating Expansion Joint

CATALOGUE

Technical data, descriptions of our district heating expansion joints, illustrations and 3D drawings...

Alternative district heating solution
ONE-STEP
EXPANSION JOINTS
One-step expansion joints are used during the start-up of the district heating pipelines to relieve the system from expansions, caused by temperature fluctuations. Once the expansion joint absorbs the movement, it functions as a regular part of the pipeline. One-step expansion joints are normally utilised in a pipeline system with an average operating temperature below 90°C and are installed while it is cold. Prior to pipeline’s commissioning, it is heated up to a mean temperature by pumping the system up with hot district heating water. Once the system reaches the mean temperature, one-step expansion joints should be “locked” by welding the cover to the pipe end. The entire system can be insulated and ready for operation. One-step expansion joints are maintenance free.

 

Advantages
  • Available pre-stressed
  • Suitable for pre-insulated pipelines
  • Functions as an ordinary part of a pipeline
Alternative district heating solution
ONE-STEP
EXPANSION JOINTS
One-step expansion joints are used during the start-up of the district heating pipelines to relieve the system from expansions, caused by temperature fluctuations. Once the expansion joint absorbs the movement, it functions as a regular part of the pipeline. One-step expansion joints are normally utilised in a pipeline system with an average operating temperature below 90°C and are installed while it is cold. Prior to pipeline’s commissioning, it is heated up to a mean temperature by pumping the system up with hot district heating water. Once the system reaches the mean temperature, one-step expansion joints should be “locked” by welding the cover to the pipe end. The entire system can be insulated and ready for operation. One-step expansion joints are maintenance free.

 

Advantages
  • Available pre-stressed
  • Suitable for pre-insulated pipelines
  • Functions as an ordinary part of a pipeline
STAY UPDATED ON OUR LATEST PROJECTS