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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

Couplings prove their worth

Couplings prove their worth Rubber-in-compression couplings, installed by Renold Hi-Tec Couplings, at a district heating utility in Sweden have proved their worth over rubber-in-shear couplings that were installed at the same time in 1986. During the twenty years of operation Renold’s rubber-in-compression couplings have only required maintenance twice to replace the rubber elements, a simple job that costs less than 10% of a replacement coupling. Conversely, when the rubber elements in the rubber-in-shear couplings needed replacing it took two days and, significantly, the cost was higher than fitting brand new rubber-in-compression couplings from Renold. As a consequence the company eventually decided to replace the rubber-in-shear couplings with rubber-in-compression. The deciding factor was the speed with which the new rubber-in-compression couplings could be installed. It took just half a day to fit the new rubber-in-compression couplings but would have taken two days to replace the rubber elements in the rubber-in-shear couplings. The couplings operate in-between a series of heat pumps and ABB synchronous motors transmitting 9,400kW at 1,500rpm. In 1986 when the couplings were first specified, engineers working for the heating utility were unsure whether rubber-in-compression or rubber-in-shear couplings would be best suited to the application. As a trial both technologies were specified, but now, twenty years later it can be seen that the rubber-in-compression couplings have provided the most reliable and cost effective solution for the plant.

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