Case story

DOUBLE BELLOWS
FOR DISTRICT HEATING

District Heating

Latvia

EJMA

In some district heating pipelines the movements are very large calling for customised District Heating Expansion Joints. Belman are experienced in the design and manufacture of customised solutions – also for District Heating Expansion Joints. In this special case the owners of an Eastern European district heating pipeline profited directly from our expertise.

 

Special design to absorb large movements
The Expansion Joints had to absorb +0/-300 mm axial movements, a very large movement for a DN 150 pipe. For this reason a special solution was required, the optimum result being a Double District Heating Expansion Joint, comprised of two standard District Heating Expansion Joints. These two were mounted opposite each other making the absorption of the large movements possible. This resulted in a build-in length of 1460 mm. To absorb these large pipe expansions (-300 mm) the District Heating Expansion Joints were also pre-stressed.

 

Pre-insulation
The Double District Heating Expansion Joints were pre-insulated with the construction being adapted for insulation, meaning that the insulation foam was applied directly on the cover and afterwards further covered by additional plastic. If required Belman can supply completely pre-insulated District Heating Expansion Joints.

DESIGN FEATURES

The Double District Heating Expansion Joints have the following design parameters:
Type: Double District Heating Expansion Joints • Dimension: DN 150 • Built-in length: 1460 mm • Design temperature: 150°C • Design pressure: 16 barG • AX: +0/-300 mm • Bellows: 1.4541 • Welding ends: 1.0425 • Inner sleeve: 1.0038 • Cover: 1.0345 • Design Code: EJMA

CLIENT BENEFIT

  • A verified and optimized Expansion Joint solution.
  • Reliability of the Expansion Joint designed to work under the operating parameters
  • Guaranteed to deliver safe, reliable and smooth operation.
  • Successful absorption of the large movements
RELATED INFORMATION

TECHNICAL information

  • Technical information on District Heating Expansion Joints is available in the District Heating Expansion Joint Catalogue
    pages 8 and 19
  • Useful information on calculations and installation is available in the District Heating Expansion Joint Catalogue
    page 39 – 40

REFERENCES 

Vattenfall • Termo Petroleo • Ørsted (Dong Energy) • RWE • Irkutsk Energo • STEAG • Novosibirsk Energo • Mosenergo  •  Drax • Hofor • Tauron • PakGen • BHEL • Ceylon Electricity Board • Rosatom • RWE Npower • Fortum • EDF (British Energy) • AEP Energy Services •  E.ON • Inter RAO • Fernwärme Wien • ENGIE Electrabel • Enel • Howden Turbo UK • Uniper • Veitur • Ceylon • Howden • Mitsuibishi Power • Stadtwerke Flensborg • Kraftzer •

TRUSTED CRAFTMANSHIP

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