EQUALISING RING REINFORCED
EXPANSION JOINTS

Belman designs, manufactures and delivers high pressure expansion joints with ring reinforcement. We have successfully manufactured expansion joints with different dimensions and for different applications, designed for a working pressure of more than 185 bar.

 

Why ring reinforcement?
By supporting a multi-layered expansion joint bellows with ring reinforcement, an optimum combination of both pressure integrity and service life is achieved.

DIMENSIONS

Ring reinforced expansion joints are customised solutions designed to fit the application.
They are available in all designs, all sizes and all materials

EQUALISING RING REINFORCED EXPANSION JOINT PROJECTS

RING REINFORCED
CORNER RELIEF EXPANSION JOINT

Oil platform, The Caspian Sea

RING REINFORCED EXPANSION JOINT

Oil refinery, Poland

RING REINFORCED
CORNER RELIEF EXPANSION JOINT

Oil platform, The Caspian Sea

RING REINFORCED EXPANSION JOINT

Oil refinery, Poland

TESTED AT 251 BARG

Pressure vessel, United Kingdom

RING REINFORCED PRESSURE BALANCED EXPANSION JOINT

Chemical plant, USA

TESTED AT 251 BARG

Pressure vessel, United Kingdom

RING REINFORCED PRESSURE BALANCED EXPANSION JOINT

Chemical plant, USA

EXCELLENCE IN

ENGINEERING OF
EQUALISING RING REINFORCED EXPANSION JOINTS

Belman ring reinforced expansion joint
TECHNICAL DESCRIPTION

Equalising rings and reinforcing ring bellows are usually chosen for high-pressure installations. Equalising rings are solid stainless steel rings fitted externally on the bellows. The rings are precisely machined so they fit into the root between each of the bellows convolutions. The purpose of the rings is to reinforce the bellows against internal pressure. By adding moment of inertia to the bellows cross section, this counteracts the bellows ability to blow out or buckle (also called squirm) and enhances its stability and pressure integrity. Bellows with reinforcing rings can be made for any type of expansion joint (axial, lateral or angular etc.) The disadvantage of the ring reinforced bellows solution is the significantly increased stiffness of the bellows and their limited movement properties.

 

Special ring reinforced solutions
For expansion joints with demanding operating conditions (like in the photo on the left page), the ring reinforcement is designed with bellows of thicker plies, of duplex stainless steel for additional strength. The reinforcement rings are supported by tie rods, which are connected to lugs. The improved flexibility of the expansion joints is further enhanced by an extra balancing bellow, which in combination with the pressure balanced design help to bring the reaction forces towards an acceptable level.

Experienced &
FAMILIAR WITH
MANY DESIGN CODES
Belman can design, manufacture and deliver expansion joints with
ring reinforcement in accordance to:
  • EN 13445
  • EN 14917
  • EJMA
Other design codes are available on request.
STAY UPDATED ON OUR LATEST PROJECTS