Introduction
DPH Engineering are Authorized Distributors of Pressure Balanced Expansion Joints. Pressure balanced expansion joints are designed to absorb movements from a pipe system.
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.
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). Pressure-balanced expansion joints are utilized where the pressure thrust is too large to be resisted by the main anchors, or the attached equipment. This type of expansion joint is designed to absorb axial, lateral, and angular movement while at the same time restraining the pressure thrust force. DPH Engineering Suppliers, exporters pressure-balanced expansion joints in a variety of styles such as externally pressurized-pressure-balanced, in-line pressure balanced, and pressure-balanced elbows.
Elbow Pressure Balanced Expansion Joints:
Elbow pressure balanced expansion joints are designed to absorb axial and lateral movements. These kind of expansion joints are used where there is limitation for the main anchors.
In-line Pressure Expansion Joints:
In-line pressure expansion joints are also designed to absorb axial and lateral movements. They are often used on turbines, pumps or compressors. The in-line pressure joint has balancing bellows and line bellows.
PB Fit:
- Bellows may be a attached or linked
to piping anges, pipe, or other typical industrial connections. - End connections may conform to standards such as ASME B16.5, ASME B36.10, or customer designed.
- Fittings generally not the same at all locations: interface connections may be as noted above. Connections within the assembly are typically to pipe.
PB Form:
- At least Two circular metal bellows, each with 1 or more convolutions. Can have Four bellows.
- Typical dimensions of 2”ANSI NPS to 120” ID. Overall length may vary, typically within the range of 36” to 240”.
- Bellows may include reinforcement or controlling members.
- Convolutions maybe U shaped or toroidal.
- Additional accessories maybe incorporated such as load bearing restraints, movement limiters, protection devices.
PB Function:
- At least Two circular metal bellows, each with 1 or more convolutions. Can have Four bellows.
- Typical dimensions of 2”ANSI NPS to 120” ID. Overall length may vary, typically within the range of 36” to 240”.
- Bellows may include reinforcement or controlling members.
- Convolutions maybe U shaped or toroidal.
- Additional accessories maybe incorporated such as load bearing restraints, movement limiters, protection devices.
Features:
- Accepts axial, lateral and angular movements
- Eliminates Pressure Thrust
Application:
- Pressure balance are used when pressure thrust needs to be eliminated
- There are two types of PB, with an elbow requires a 90 degree turn in the piping system, and inline can be put in a straight piping system
Operation Range:
- Full vacuum to 2000 psig depending on size
- Cryogenic to 1650°F+
- Sizes from 1” NPS to > 240” NPS
Materials Bellows:
- 3XX Series Stainless Steel
- Nickel Alloys
- Carbon Steel
- Titanium
- Zirconium
Advantage:
What are the advantages of using pressure balanced expansion joints?
The advantage of pressure balanced expansion joints are that they reduce 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. Pressure balanced expansion joints are 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.
