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.
Design range and scope of supply within Pressure Balanced Expansion Joints
Pressure Balanced Expansion Joints are available in all sizes and materials. Furthermore, Pressure Balanced Expansion Joints are customised and available in various designs and types with both internal limiters and external limiters.
Up to 150 barg or more if required
-256°C to +1000°C
Austenitic stainless steels, High alloys, Duplex, Titanium, Hastelloy,
Incoloy, Inconel, Alloy 59
EN 13445, EN 13480, EN 14917
ASME VIII, div.I, ASME B31.3
ASME B31.1, EJMA, AD 2000
and others on request
Radiographic examination (X-ray), Helium leak testing, Pressure test, Air test, Dye penetrant test, Magnetic particle examination and many more
PRESSURE BALANCED EXPANSION JOINTS
PRESSURE BALANCED DESIGN
To avoid closed spaces were the media could pack up and restrict the correct functioning, this unique design was made.
This 4-meter long DN 2500 Inline Pressure Balanced Expansion Joint having a balancing bellow of an amazing DN 3800.
WITH RING REINFORCEMENT
This Finger Type Inline Pressure Balanced Expansion Joint has ring reinforcement due to high pressure in the piping system.
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.
TYPES & DESiGNS
Pressure Balanced with external limiters
Pressure Balanced with 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 pressure Balanced Expansion Joints with a compact design and a hidden balance chamber.
Customised Pressure Balanced Expansion Joints
Belman is recognised for our customised solutions and for always helping the client getting the exact Expansion Joint solution optimum for the application and proejct in question.
The movement absorbed by Pressure Balanced Expansion Joints 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).
HOW DOES THE
This animation is showcasing how movements are absobed by
the Pressure Balanced Expansion Joints
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. 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. 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.
QUALITY & TESTS
Belman is known for high quality products and therefore our quality control is a fundamental part of our business. All processes during production designed by the Belman quality engineers, is strictly follow and implement according our procedures and instructions and carefully inspected by Belman quality inspectors. All checks and inspections are done according to the strict prevailing Belman quality control procedures which is part of the Belman ISO 9001 quality management system approved by DNV.
ITP & Test
Inspection test Plan generated by the quality management system makes sure that each step of manufacturing has the appropriate inspection points such as Hold and Witness points.
Based on manufacturing code, project specification, application, media, and eventual ship classification rules Belman performs a large variety of quality tests including destructive, non-destructive testing and proof testing. All tests can be witnessed by the 3rd part based on the customer and classification requirements.
- Destructive test: such as life cycle test and burst test to validate the design, i.e., vessels and offshore platforms
- Non-destructive test such as Visual testing, dye penetrant test, Radiography examination, Magnetic testing, ultrasonic testing, hardness testing and PMI for all applications
- Proof tests: leak test with air, leak test with helium and former gas, hydrostatic pressure test for all application
PRESSURE BALANCED EXPANSION JOINTS
WE HAVE ENGINEERED
EXPANSION JOINTS SINCE 1994
This enable us to find you the optimum solution to your piping system.