Flowserve CircPac Carbon Ring Seal
Segmented carbon ring barrier seal used in high-speed centrifugal compressors to protect mechanical gas seals from bearing oil contamination. In turbomachinery, bearing oil becomes highly turbulent; by supplying a barrier gas flow, the CircPac prevents oil from migrating into the gas seal chamber.
The CircPac can also be applied as a standalone segmented carbon ring seal, or configured with multiple carbon rings for low-pressure applications where conventional gas seals are unnecessary. Its non-contacting design eliminates wear, extends lifecycle and provides cost-effective reliability across a wide range of industries.
Features of Flowserve CircPac Carbon Ring Seal
Protects compressor gas seals from bearing oil mist contamination
Low heat generation for safe and reliable operation
Long service life and cost-effective sealing solution
Shorter axial length compared to labyrinth seals
Prevents process gas leakage into bearing oil
Close tolerances deliver reduced leakage over labyrinth designs
Non-contacting operation – eliminates wear and downtime
Bi-directional sealing reduces spare part requirements
Simple and robust design with low lifecycle cost
Operating Parameters
| Parameter | Value / Range |
|---|
| Temperature Max | 80 °C (180 °F) |
| Pressure Max | 5 bar (70 psi) – depends on diameter |
| Materials | Carbon, Stainless Steel, Fluoroelastomers, Perfluoroelastomers |
| Notes | Higher parameters available upon request |
Applications of Flowserve CircPac Seal
Industrial Applications
Energy & Power
Oil & Gas (upstream, midstream, downstream)
Power generation (steam, geothermal, combined cycle, CSP)
CircPac is particularly effective in centrifugal compressors where gas seal protection and oil mist control are critical to equipment reliability.
FAQ About Flowserve CircPac Seal
Q1: What is a segmented carbon ring seal?
A: It is a non-contacting seal design with split carbon segments that provide tight tolerances, reducing leakage and preventing wear.
Q2: How does the CircPac protect compressors?
A: It prevents bearing oil mist from entering the compressor gas seal chamber, ensuring stable and reliable gas seal performance.
Q3: Can CircPac be used as a standalone seal?
A: Yes, it can serve as a cost-effective standalone segmented seal, or be configured with multiple rings for low-pressure duties.
Q4: What industries use CircPac?
A: Widely applied in oil & gas, power generation, chemicals, mining, biofuels, and pharmaceuticals.
Q5: How does CircPac compare to labyrinth seals?
A: CircPac offers shorter installation length, reduced leakage, and non-contacting design, making it more reliable and cost-efficient.
- Flowserve segmented carbon ring seal Brochure
- Flowserve Seal Product Portfolio
- Flowserve Seal Management (Fluid Management Challenges)
The Flowserve CircPac segmented carbon ring seal is a proven solution for protecting compressor gas seals from oil mist contamination while delivering low leakage, non-contacting operation and long service life. Its versatile design allows use as a barrier seal or as a standalone segmented carbon ring seal in low-pressure applications, providing both cost-effectiveness and reliability. Contact us today to specify the right Flowserve CircPac carbon ring seal for your system and maximize equipment uptime.
