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Horizontal recip use of rider pads?

Horizontal recip use of rider pads?

Horizontal recip use of rider pads?

(OP)
Hi All,

We recently changed our piston design on a large horizontal reciprocating compressor to one recommended to us incorporating rider bands (one piece, not split design) to either side of the compression rings. We have since gone back to the original design as we were finding that even though there should have been enough of a compression fit the rider bands were energizing enough that they were picking up and catching the sides of the discharge ports (the ends of the piston where the rider bands were installed go pass the discharge ports with each stroke) leading to rider band damage amd rubber fragments passing through the machine.

Ideally we would still like to have a design incorporating riders of some type as they should lead to reduced cylinder wear which has been an issue with this machine.

One consultant suggested using rider pads (i.e. an insert into a milled cavity) that could be designed so that they would not pass any ports during their normal stroke. Does anyone have any details on this? (I.e. has it been done before, does it work, who designs/markets this?) I've been throwing searches at google and haven't found anything. Alternatively would be interested in hearing of why this would be a bad idea as I am quite new to compression.

Thanks in advance!

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