New record set…

With 356 Barg test pressure and 215 Barg design pressure this spectacular Gimbal Expansion Joint has set a new record at Belman. This is the highest pressure ever recorded for an Expansion Joint manufactured on our premises. Prior to this project, the record for a Belman produced Expansion Joint stood at 251 Barg and with a design pressure of 145 Barg.


Expansion Joints and high pressure

This featured high pressure Expansion Joint is installed in a petrochemical facility, however we see high pressure Expansion Joints applied in numerous use cases such as in conventional and nuclear power industries and chemical plants. No matter what the application, when Expansion Joints are exposed to high pressure special concerns during the design phase needs to be addressed. The hardware on the Expansion Joints such as connection ends (flanges and welding ends), tie rods, hinges and gimbals often require an increased material thickness. Furthermore, at very high pressure the bellow also requires special reinforcement.


Ring reinforcement for high pressure

When designing Expansion Joints for high pressure, ring reinforcement is often the best solution. By supporting multi-layered Expansion Joint bellows with ring reinforcement, an optimal combination of both pressure integrity and service life is achieved. 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. The rings are usually fabricated from stainless steel or other suitable alloy steel products, which are precisely machined to fit into the root between each of the bellows convolutions. The rings are applied when forming the convolutions of the bellows. The rings can be applied to any type of Expansion Joints and movements (including axial, lateral and angular types and movements).


Special ring reinforced solutions

For Expansion Joints used in demanding operating conditions special arrangements need to be taken into account. For example, a design with bellows of thicker plies, could utilize duplex stainless steel for additional strength, with the ring reinforcement specially designed and supported by tie rods, which are connected to the lugs of the Expansion Joint.


Highly experienced with high pressure

Belman has expertly designed, manufactured and supplied many Expansion Joints for high pressure installations and with many different designs to precisely suit the client’s application. We have numerous projects featuring such cases, here we can refer to two such cases: Ring reinforced corner relief Expansion Joints for 145 barg pressure which was installed at a nuclear power plant. Another project concerns an Inline pressure balanced expansion joints for 82 barg pressure which is in use at a fertilizer manufacturer.