New compound increases coupling service life

The new 'Y' elastomer was first used in a combined heat and power (CHP) plant of a central purification plant, where an Arcusaflex coupling with a standard elastomer made of natural / synthetic rubber compound had originally been in use. This was the right choice for a temperature range stated, from –40 °C to +80 °C. However, the temperatures occurring directly at the coupling were actually higher, in part due to the specific mode of operation of the CHP plant. This led to initial incipient cracks appearing in the rubber disc coupling after just 3,000 hours of operation. The coupling failed after approximately 4500 hours of operation and had to be replaced by another element.

When, however, premature incipient material cracks began to show again after the coupling had been replaced, Reich Kupplungen started to investigate the cause. The issue was identified as being a result of temperatures well in excess of +80ºC, contrary to what had been stated previously. The solution was the use of the new 'Y' rubber compound.

This material demonstrates excellent durability against high temperatures, UV light, ozone and aggressive substances such as chemicals, hot water and steam. As regards its durability against oils and fuels, it is comparable to that of the common natural / synthetic rubber compounds. Thanks to its good strength properties, even at elevated temperatures, the rubber compound is suitable for highly flexible designs which are subjected to pressure and shear stresses.