Circpac™ Carbon Ring Seal

Flowserve’s CircPac™ is a segmented carbon ring seal. The barrier seal is used in high speed centrifugal compressors to keep the bearing oil away from the gas seal. In high speed turbomachinery the oil in the bearing cavity becomes very turbulent. By providing a barrier gas flow to the mechanical seals, the velocity of the gas exiting the segmented carbon ring seal towards the oil from contaminating the compressor gas seal. 

Flowserve’s CircPac can also be used as a cost-effective ‘stand alone’ segmented carbon ring seal. It can also be configured as a multiple carbon ring to be utilized in low pressure applications where the low leakage of a conventional gas seal is not required. 

The seal optimizes design life by providing a clearance between the sleeve and the carbon bushings which eliminates wear and extends the lifecycle of the equipment. The design conceptualization compliments the non-contacting GASPAC compressor gas seal providing a long time of trouble-free performance. The CircPac has often been reused after seal inspection in a variety of applications.