PRESSURE BALANCED EXPANSION JOINTS

Pressure balanced expansion joints are designed to absorb movements from a pipe system. They can accommodate axial and lateral movements where anchoring of the pipe system is difficult or impractical due to structural or economic considerations. Pressure balanced expansion joints do not transfer the internal pressure thrust on to the fix points, adjacent equipment, or structures. Fix points are usually not required, only guides can ensure the turning of thermal expansion into a controlled movement.
Therefore, pressure balanced expansion joints can offer significant advantages, where pipe systems are connected with turbines, pumps, valves or other equipment, that are unable to withstand pressure thrust loads.

Although pressure balanced expansion joints eliminate pressure thrust, it’s important to note that the existing load on the surrounding equipment is the total sum of the spring rates of both the flow bellows and balancing bellows. The movement absorbed by a pressure balanced expansion joint should be understood as follows:
If the thermal movement in the connected pipe is 20 mm, the flow bellows of the pressure balanced unit will contract by 20 mm and the balancing bellows, with twice the effective area of the flow bellows, will expand by 20 mm.
Pressure balanced expansion joints can be designed to any specific requirement with tie rods, with cover, and also for the absorption of lateral and or angular movements (universal type).

DIMENSIONS & DESIGN

Universal pressure balanced expansion joints are available in all sizes and materials.
Furthermore pressure balanced compensators are available in various designs and types with both internal limiters and external limiters.

PRESSURE BALANCED EXPANSION JOINT PROJECTS

2 METER LONG

Biomass cogeneration plant, Croatia

100% STAINLESS STEEL

Refinery, Hungary

2 METER LONG

Biomass cogeneration plant, Croatia

100% STAINLESS STEEL

Refinery, Hungary

WITH EXTERNAL LIMITERS

Power plant, Sweden

WITH INTERNAL LIMITERS

Steam turbine, Senegal

WITH EXTERNAL LIMITERS

Power plant, Sweden

WITH INTERNAL LIMITERS

Steam turbine, Senegal

EXCELLENCE IN

PRESSURE BALANCED EXPANSION JOINT ENGINEERING

Belman inline pressure balanced expansion joints

ADVANTAGES

The advantage of a pressure balanced expansion joint is that it reduces the complexity and size of fix points by eliminating the pressure thrust, thereby delivering stability to the pipe system. This also reduces the required space for structures that carry fix points and guides. Pipe engineers are often faced with the challenge of limited space due to the surrounding environment. It may not be possible to include a number of fix points and guides that are normally required at high pressures. The pressure balanced expansion joint is the optimum solution for additional scenarios such as a short pipe run connecting two vessels, that are unable to withstand the pressure thrust loads or at heights, where additional structures would significantly
increase costs.

APPLICATION

Pressure balanced expansion joints are used with low pressure turbines, with condensers and also with pumps and other equipment, that may be susceptible to pressure loads.

Other types of pressure balanced
PRESSURE BALANCED – COMPACT DESIGN

Pressure balanced expansion joints are expansion joints incorporating a balancing chamber. This creates a balancing pressure thrust, which opposes the internal pressure thrust force from the flow bellows.

In many applications, the design parameters lead to the requirement for a customised expansion joint type. This can be especially challenging when the desired expansion joint type requires more space than the pipe system dimensions permit. This can sometimes be resolved by the use of a pressure balanced expansion joint with a compact design and a hidden balance chamber.

 

Other types of pressure balanced
ELBOW
PRESSURE BALANCED

Elbow pressure balanced expansion joints or corner relief expansion joints are the types of pressure balanced expansion joints which are used where pressure thrust forces on equipment or piping is unacceptable and the direction of the pipe system also changes.

 

Other types of pressure balanced
ELBOW
PRESSURE BALANCED

Elbow pressure balanced expansion joints or corner relief expansion joints are the types of pressure balanced expansion joints which are used where pressure thrust forces on equipment or piping is unacceptable and the direction of the pipe system also changes.

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