BEST-IN-CLASS

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.

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.

Dimensions

DIMENSIONS:
DN 15-12.000

Pressure

PRESSURE:
Up to 150 barg or more if required

Temperature

TEMPERATURE:
-165°C to +1000°C

Materials_bellow_Symbol

MATERIALS:

Austenitic stainless steels, High alloys, Duplex, Titanium, Hastelloy,
Incoloy, Inconel, Alloy 59

Design_Codes_Symbol

DESIGN CODES:

EN 13445, EN 13480, EN 14917
ASME VIII, div.I, ASME B31.3
ASME B31.1, EJMA, AD 2000
and others on request

Test and Quality Control

TESTS:

Radiographic examination (X-ray), Helium leak testing, Pressure test,  Air test, Dye penetrant test,  Magnetic particle examination and many more

ENGINEERED
PRESSURE BALANCED EXPANSION JOINTS
PRESSURE BALANCED EXPANSION JOINTS

CASE STORIES

UNIQUE
PRESSURE BALANCED DESIGN

To avoid closed spaces were the media could pack up and restrict the correct functioning, this unique design was made.

GIANT INLINE
PRESSURE BALANCED

This 4-meter long DN 2500 Inline Pressure Balanced Expansion Joint having a balancing bellow of an amazing DN 3800.

PRESSURE BALANCED
WITH RING REINFORCEMENT

This Finger Type Inline Pressure Balanced Expansion Joint has ring reinforcement due to high pressure in the piping system.

EXPERIENCED & APPROVED SUPPLIER REFERENCES

Vattenfall • BP • Thyssenkrupp • SABIC • YARA • Air Liquide • Valmet • Cummins • Ineos • Saline Water Corporation (SWCC) • Bronswerk • Rolls Royce • Deutsche Bahn • OMV • Shell • Carlsberg • GEA • Huyndai Heavy Industries • Areva • Andritz • Statoil • MOL • Chevron • Metso • TORM • Eni • Murco Petroleum Limited • Nornickel • Dieffenbacher • EDF • Linde Ag • Qapco • Preem • Tauron • Fortum • Total • Saudi Aramco • Uniper • Paul Wurth • Maersk • Tatneft
Ceylon Petroluem • SSAB • Siemens • BHEL • Aurubis • Termo Petroleo • SMS Group • Aker Solutions • Repsol • Equinor (Statoil) • IBN Sina • Novatek • Royal Caribbean Cruise Lines • Valero • DOW • Messer Group • MAN Diesel & Turbo • Wärtsilä • Mondi • Caterpillar • ArcelorMittal • Valero • GE • Technip • RWE • ENGIE • ExxonMobil • Pfizer • Solvay • Finnlines • Sinopec • Petrogal • NOV • Sasol • CMA CGM • Dorian LPG • Bilfinger • Salzgitter
PRESSURE BALANCED EXPANSION JOINTS 
TECHNICAL DESCRIPTION
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.

TYPES & DESiGNS
Pressure Balanced Expansion Joints are avalable in many designs depending on the operating parameters.
The main types used for design is:

Finger type
(internal limiters)

Pressure Balanced with external limiters

Corner Relief
Pressure Balanced

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.

MOVEMENTS

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
PRESSURE BALANCED
EXPANSION JOINT
WORK?

This animation is showcasing how movements are absobed by
the Pressure Balanced Expansion Joints

BELMAN YOUTUBE CHANNEL 

More animations on how different Expansion Joint types absorb movements can be seen on the Belman Group Youtube channel

ADVANTAGES

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.

GET THE CATALOGUE

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GET THE INSTALLATION INSTRUCTION

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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
INSTALLED

WE HAVE ENGINEERED
EXPANSION JOINTS SINCE 1994

This enable us to find you the optimum solution to your piping system.

QUALITY-ASSURED SOLUTIONS

CERTIFICATES & TYPE APPROVALS

Belman Expansion Joints are certified by recognised accrediation bodies and classification societies.

System certifications:
  • EN ISO 9001:2015
  • EN ISO 3834-2
  • 2014/68/EU Module H
  • AD 2000-Merkblatt HP0
  • BV Mode I
  • TR CU 032/2013 (GOST-R)
Type and manufacturing approvals (incl. LNG/LPG):
  • DNV (Pressurized and exhaust)
  • DNV (LNG-LPG)
  • Lloyd’s Register (LNG-LPG)
  • Bureau Veritas (Pressurized, exhaust and LNG-LPG)
  • ABS
  • RINA
Others:
  • CE & UKCA markings
  • Achilles JQS
  • UTILITIES NCE
  • Declaration of conformity (Russian Rostechnadzor)


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