The Dog Bone Type Expansion Joint is used as flexible connection between Turbines and Condensers. This turbine exhaust expansion joint is used as a flexible connection in power plants and it is the most widely used turbine to condenser expansion joint in use.
One of the main functions of the Dog Bone Expansion Joint is to absorb the differential thermal expansion between the steam turbine and the condenser while imparting minimal forces and moments on the turbine exhaust flange. Steam turbines come in a variety of exhaust configurations such as down exhaust, axial exhaust and top exhaust. Each configuration has unique design and performance requirements for the expansion joint. The expansion joint must perform satisfactory under a wide range of operating conditions to ensure reliable operation of the turbine condenser system.
MACOGA provides the highest Quality Dog-Bone Type Expansion Joints.
|Standard overall width||240 mm (9-3/8”)|
|Rubber Material||EPDM or Neoprene|
|Reinforcements||6 (standard) or 8 ply polyester 500 warp x 500 fill tensile strength.|
|Knobs||32 mm (1-1/4”) diameter|
|Core||16 mm (5/8”) Polypropylene cord|
|Axial Compression||25 mm (1”)|
|Axial Extension||3 mm (1/8”)|
|Lateral Movement||12 mm (1/2”)|
121 °C (250 °F) continuous
194 °C (350 °F) intermittent (max. 36 hours whole life)
107 °C (225 °F) continuous
152 °C (275 °F) intermittent (max. 36 hours whole life)
The internal liner secures a smooth flow, protects bellows from flow induced vibrations, hold friction to a minimum and protect bellows from erosion.
In carbon steel material as standard, they can be supplied with landing bars or weld ends for welding to customer’s ducting or with flanges drilled to match customer’s equipment.
The rubber belt expansion joint equipped on both sides with self-sealing rubber knobs, affixed to the connecting metal parts using specially designed machined clamps that ensure tightness. The machined clamps and the bolting ensure leak tightness during operation. The clamps on either end are welded to a flange if the expansion joint is to be bolted to the condenser and the turbine. The clamps are welded to filler piece of a weld end if the expansion joint is to be welded to the turbine or the condenser.