A significant number of MRR Series High-pressure Expansion Joint have been successfully designed, manufactured and tested at MACOGA for the hydroelectric power Plant of Calheta III in Madeira, Portugal.

The Expansion Joints with sizes of DN1000, 1300 and 1400 are designed for 100 bar pressure and hydraulically tested at 143 bar.

The MRR model is used in cases of high internal pressure. The system involves the use of reinforcement or equalizing rings located around the outside of the convolution thus preventing the bellows being forced out of shape due to the high pressures. Equalizing and Reinforcing Rings are devices used on some expansion joints fitting snugly in the roots of the convolutions. The primary purpose of these devices is to reinforce the bellows against internal pressure and equalize the movement among all the corrugations.

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