Reciprocating compressors of the crosshead design have sealing elements around the piston and piston rod. These seals can be of lubricated or nonlubricated design. This paper will give details about our R&D-work for dry running piston rod sealings or packings for high pressure applications. Starting with an overview of packing design some details are given about tribological tests. Measurements within packings give informations about the physics in this special dry running sealing element. Calculations of temperatures in the contact area between a dry running sealing ring and piston rod point to the main problem to be solved: The energy input due to friction. A new sealing ring design for packings is presented. Whith this new development we are able to seal a pressure difference of 100 bar across the packing and achieve a sufficiently long life.
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