We have Reciprocating type Dresser Rand make Natural Gas ( BOG)  compressor.. It is 2 stage 4 cylinder compressor.Recently we have done complete overhauling of the machine and replaced all piston ring and rider ring with new one. In HP NDE Cylinder Piston rubbed the liner after only 50 hrs of running hour. With same piston ring and rider ring we are getting more than 4500 running hour life. In one piston there is 2 Piston and 2 rider rings. Construction of rings is Rings Split type.

What are probable reason for failure??

Pawan

Original Post

Please provide additional details, do you have any photos of damaged liner? Rubbed the liner is a very broad term, rubbed where in the liner? new liners? packing? any measurements taken on the liner to prove it is straight and not worn?

If the piston touched the liner, ring rides too deep in piston, egg shaped liner, worn piston holding pin, bent rod to name a few possible starting points

Dave

pawannlng posted:

We have Reciprocating type Dresser Rand make Natural Gas ( BOG)  compressor.. It is 2 stage 4 cylinder compressor.Recently we have done complete overhauling of the machine and replaced all piston ring and rider ring with new one. In HP NDE Cylinder Piston rubbed the liner after only 50 hrs of running hour. With same piston ring and rider ring we are getting more than 4500 running hour life. In one piston there is 2 Piston and 2 rider rings. Construction of rings is Rings Split type.

What are probable reason for failure??

dear sir

because of failure event after overhauling you should check all installing and assembly procedure .do you have any vibration condition monitoring data during 50 hrs?any protection like rod drop proximity sensor ?

are you sure about  operating process parameter during that time ?   

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