Early detection of rider ring damage on a Free Floating Piston Application: Thomassen piston compressor 2 throws, 2 stages Medium: Hydrogen Capacity control: HydroCOMThe compressor has a „Free Floating Piston“ system with non-lubricated cylinder (for lifetime optimization of rider rings) and a mini-lube stu?ng box seal. This machine combines the Free Floating Piston system with a Hoerbiger HydroCOM ?ow regulation. Since the initial compressor start, the piston rings of both stages reached only short operation lifetimes of 1,500 hours and with a decreasing tendency: Lifetimes before replacement of piston rings of the 1st stage : 1,850 hrs 707 hrs 891 hrs 801 hrs 1,607 hrs Lifetimes before replacement of piston rings of the 2nd stage : 3,773 hrs 4,006 hrs Preliminary PROGNOST® data a

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