Metal Expansion Joint
Applications of Metal Expansion Joint
● Power Generation
● Ship power and ship building
● District Heating
● Steel Mills
● Water Treatment
● Wind Power
● Pulp and Paper Plants
● Desulphurization plants
● Off shore
● Refineries
● Chemical and Petrochemical Plants
Reference Standard of Metal Expansion Joint
ISO15348
EN14917
GBT12777
Category and Range of Metal Expansion Joint
Single Expansion Joint
The simplest form of Expansion Joint, is single bellow construction, for the purpose of absorbing any combination of the three basic movements: axis movement, lateral deflection and angular rotation
 | Diameter Range | DN50-2800 (2-112") |
Temperature Range | -240℃--800℃ | |
Pressure Range | Full Vacuum to 50bar |
Double Expansion Joint/Dual Expansion Joint
A Double Expansion Joint, also known as Dual Expansion Joint Consist of two bellow joined by a common connector which is anchored to some rigid part of the installation by means of an anchor base. The anchor base may be attached to the common connector either at installation or at time of manufacture. Each bellow acts as a single Expansion Joint and absorbs the movement of the pipe section in which it is installed independently of the other bellow.
 | Diameter Range | DN50-1500 (2-60") |
Temperature Range | -240℃--800℃ | |
Pressure Range | Full Vacuum to 50bar |
Universal Expansion Joint
A Universal Expansion Joint is one containing two bellow joined by a common connector for the purpose of absorbing any combination of the three basic movements: axis movement, lateral deflection and angular rotation. Universal Expansion Joints are usually furnished with control rods to distribute the movement between the two bellow of the Expansion Joint and stabilize the common connector. This definition does not imply that only a Universal Expansion Joint can absorb combined movement.
 | Diameter Range | DN50-1500 (2-60") |
Temperature Range | -240℃--800℃ | |
Pressure Range | Full Vacuum to 50bar |
Tied Universal Expansion Joint
The Tied Universal Expansion Joints are used when it is necessary for the assembly to eliminate pressure thrust force from the piping system. In this case the Expansion Joint will absorb lateral movement and will not absorb any axial movement external to the tied length.
 | Diameter Range | DN50-1500 (2-60") |
Temperature Range | -400F-850F | |
Pressure Range | Full Vacuum to 35bar |
Hinged Expansion Joint
A Hinged Expansion Joint contains one bellow and is designed to permit angular rotation in one plane only by the use of a pair of pins through hinge plate attached to the Expansion Joint ends. The hinges and hinge pins must be designed to restrain the thrust of the Expansion Joint due to internal pressure and extraneous force, where applicable. Hinged Expansion Joints should be used in sets of two or three to function proreply.
 | Diameter Range | DN50-1200 (2-48") |
Temperature Range | -240℃--400℃ | |
Pressure Range | Full Vacuum to 35bar |
Gimbal Expansion Joint
A Gimbal Expansion Joint is designed to permit angular rotation in any plane by the use of two pairs of hinged affixed to common floating gimbal ring. The gimbal ring, hinges and pins must be designed to restrain the thrust of the Expansion Joint due to internal pressure and extraneous forces, where applicable.
 | Diameter Range | DN50-1200 (2-48") |
Temperature Range | -240℃--400℃ | |
Pressure Range | Full Vacuum to 35bar |
(Elbow) Pressure Balanced Expansion Joint
A Pressure Balanced Expansion Joint is designed to absorb axial movement and/or lateral deflection while restraining the pressure thrust by means of tie devices interconnecting the flow bellow with an opposed bellow also subjected to line pressure
 | Diameter Range | DN50-1200 (2-48") |
Temperature Range | -240℃--400℃ | |
Pressure Range | Full Vacuum to 35bar |
In-Line Pressure Balanced Expansion Joint
An In-Line Pressure Balanced Expansion Joint is designed to absorb axial movement and/or lateral deflection while restraining the pressure thrust by means of tie devices interconnecting the line bellow with outboard compensating bellow also subjected to line pressure. Each bellow set is designed to absorb the axial movement and usually the line bellow will absorb the lateral deflection. This type of Expansion Joint is used in a straight run of piping.
 | Diameter Range | DN50-600 (2-24") |
Temperature Range | -240℃--450℃ | |
Pressure Range | Full Vacuum to 20bar |
External Pressure Expansion Joint
The External Pressure Expansion Joint is designed so that the pressure is external to the bellow while the inside is at atmospheric pressure and it has many convolutions to allow a large amount of axial movement. But under external pressure the bellow will retain its shape completely stable. Besides externally pressurized bellow is protected from external damage by a heavy wall shroud and is isolated from flow impingement by an internal sleeve.
 | Diameter Range | DN50-600 (2-24") |
Temperature Range | -240℃--450℃ | |
Pressure Range | Full Vacuum to 35bar |
Grooved End Expansion Joint
The Grooved End Expansion joint is a perfect choice for the grooved piping system which is often used in fire-protection pipeline. With a coupling, it is easy to be connected with grooved pipes or fittings.
 | Diameter Range | DN50-600 (2-24") |
Temperature Range | -240℃--400℃ | |
Pressure Range | Full Vacuum to 50bar |
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