ANGULAR EXPANSION JOINTS

Angular expansion joints allow angular movements only, contrary to axial expansion joints which elongate and compress in the pipeline axis. The angular expansion joint moves in an angular rotation in one or several planes, controlled by a pair of hinges or a gimbal. The angular expansion joint is as standard delivered with either hinges or gimbals, and can be manufactured with any end connections such as welding ends, welded flanges, or loose flanges or combinations thereof, depending on client requirements.

DIMENSIONS

Belman design and manufacture a wide range of angular expansion joints.

Customised solutions
As customised solutions joints angular expansion joints are available in all sizes up to DN 12.000, all designs and all materials.

Standard solutions
As standard solutions angular expansion joints are available in size range DN 50 – 2200.

ANGULAR EXPANSION JOINT TYPES

Belman AN1BH compensator
ANGULAR
with loose flanges and hinges

AN1BH / ID no. 61
DN 50 – 600
PN 6 – 25
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Belman AN1BK compensator
ANGULAR
with loose flanges and gimbal

AN1BK / ID no. 62
DN 50 – 800
PN 6 – 25
Download (PDF)

ANGULAR
with welded flanges and hinges

AN1FH / ID no. 63
DN 50 – 800
PN 6 – 25
Download (PDF)

ANGULAR
with welded flanges and gimbal

AN1FK / ID no. 64
DN 50 – 800
PN 6 – 25
Download (PDF)

ANGULAR
with welding ends and hinges

AN1SH / ID no. 65
DN 50 – 2200
PN 2,5 – 63
Download (PDF)

ANGULAR
with welding ends and gimbal

AN1SK / ID no. 66
DN 50 – 2200
PN 2,5 – 63
Download (PDF)

Expansion joint

CATALOGUE

Comprehensive technical data and selection criteria for +3500 standard metallic expansion joints.

CUSTOMISED ANGULAR EXPANSION JOINTS

HINGED EXPANSION JOINT

Steel plant, Belgium

40 TON DOUBLE HINGED EXPANSION JOINT

Steel plant, Germany

HINGED EXPANSION JOINT

Steel plant, Belgium

40 TON DOUBLE HINGED EXPANSION JOINT

Steel plant, Germany

GIMBAL EXPANSION JOINT

Steel plant, Egypt

HINGED- & GIMBAL EXPANSION JOINTS

Chemical plant, South Africa

GIMBAL EXPANSION JOINT

Steel plant, Egypt

HINGED- & GIMBAL EXPANSION JOINTS

Chemical plant, South Africa

TECHNICAL DESCRIPTION

Hinged angular expansion joints
Hinged angular expansion joints are equipped with hinges, to absorb angular movement/rotation in one plane only. The hinges are designed to resist the pressure thrust from the pipe system. Single hinged expansion joints are generally used in pairs or threes with a connecting pipe system between, and widely used in irregular and complex pipe systems.

Gimbal angular expansion joints
Gimbal angular expansion joints are designed to absorb angular movements in several planes without transferring pressure thrust on to the fix points. A gimbal expansion joint is more flexible than a hinged expansion joint as the gimbal enables multiple angular rotations.

Angular expansion joints in general
Angular expansion joints offer a wide range of options, and when built into two or three pinned pipe systems, they can accommodate very large movements with very low reaction forces, without the need for fix points and structures. As angular expansion joints are fully restrained, they require only inexpensive guides or intermediate guides. This gives an economic advantage in large diameter, hot piping systems, even if the movements are complex and in several planes. Further, the hinges or gimbal can be designed to support the dead weight loads from the adjacent pipes and connected equipment, and to carry wind loads, snow loads, and any other external loads from the pipe system, minimizing the need for fix points and structures.

The hinge can also be designed to eliminate torsion forces acting on the bellow. The bellow does not allow any torsion, and this should be counteracted against in all cases. When the angular expansion joints are installed in two hinged or three hinged systems, the distance/intermediate pipe between each unit should be as large as possible, as this allow maximum lateral deflection or movement to be absorbed. If the thermal growth of the intermediate pipe is significant, a three hinged system is required.

Angular movement
Angular movement is an angular/rotational displacement of the expansion joint where its longitudinal axis is displaced as an arc from its initial position. This is to be understood as an angulation of the expansion joints two end planes relative to each other, which results in the longitudinal centreline becoming an arc, like a pipe bend. The convolutions are uniformly compressed along the inside of the bellows longitudinal centreline, and uniformly elongated along the outer radius of the arc. Torsion or twisting of one end with respect to the other end about its longitudinal axis, and is not to be understood as angular rotation.

Definitions
Angular movement is shown as AN and stated in degrees. Angular rotation is indicated as negative (-) and positive (+) respectively.

Example
Angular movement positive +5 and negative -10 will be stated as: AN +5/-10°. An equal angular rotation over the bellows longitudinal centreline are stated as AN +/-10° (2αN).

ADVANTAGES & REQUIREMENTS

Advantages

  • Absorbs angular movements in single or multi plane
  • Use of normal guides
  • Reduced loads on all fix points

Requirements

  • Changes in flow direction/pipe direction is required
  • More space consuming than axial expansion joints
  • Two or three expansion joints are required for a system

PIPE WORK GUIDELINES

INSTALLATION EXAMPLES

Hinges in a system

Hinged expansion joints can, in sets of two or three, be used for absorbing large lateral and axial movements. In general, there should not be more than three angular expansion joints installed between two fix points, of which a maximum of two can be gimbal expansion joints.

Two gimbals in a three-dimensional system

Just as hinged expansion joints offer great advantages in single plane applications, gimbal expansion joints are designed to deliver similar benefits in multi-plane systems. The gimbal expansion joints ability to absorb angular rotation in any plane is most frequently achieved by utilising two such units to absorb lateral deflection. An application of this type is shown in the illustration. Since the pressure loading is absorbed by the gimbal structure, fix points only are provided. Guides are provided to restrict the movement of each piping leg. As in the case of hinged expansion joints, the location of pipe supports is simplified by the load carrying ability of the gimbal structure. Since, in a two gimbal system, the growth of the vertical pipe leg will be absorbed by bending of the longer legs, spring supports (SP) may be required on either or both of these. Guides must be designed to allow for the thermal expansion of the leg containing the expansion joints and for the shortening of this leg due to deflection.

Our experience, your benefit
CUSTOMISED
EXPANSION JOINTS!
If the required/specified expansion joint is not found in our standard product range, please do not hesitate to forward your specifications to us. We are specialised in designing and manufacturing of cost-efficient customised solutions.
Virtual demonstration of
Angular Expansion Joint (Gimbal)
PREPARE TO BE AMAZED!
Discover in detail one of our Angular expansion joint (Gimbal). View it in 3D and navigate around it to examine it’s features. All you need is a tablet or smart phone, then simply follow the instructions contained in the PDF file.
Virtual demonstration of
Angular Expansion Joint (Gimbal)
PREPARE TO BE AMAZED!
Discover in detail one of our Angular expansion joint (Gimbal). View it in 3D and navigate around it to examine it’s features. All you need is a tablet or smart phone, then simply follow the instructions contained in the PDF file.
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