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Centrifugal compressor seals are a critical subsystem, carefully integrated into the overall unit design. The dry gas seals employed in
Dresser-Rand centrifugal compressors represent a significant advance in shaft sealing. Gas
seals eliminate the need for complex and costly seal oil systems, and the ongoing
maintenance associated with them. The parasitic power losses caused by oil shear and drag
are also absent with gas seals
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FEATURES |
| Cost and
maintenance of seal oil systems with their pumps, filters, seal traps, piping, etc., are
avoided. |
| Disassociating
entrained gas and the hazard of explosive mixtures in the oil reservoir of combined lube
and seal oil systems are eliminated. |
| Extended life
of lubricating oil. |
| Total
elimination of contamination of the process gas by seal lubricants. |
The Heart of the Seal
The heart of the gas seal is a pair of rings. A stationary ring is
held against a rotating ring by spring pressure. The contact face of the rotating ring
incorporates special film-riding geometries in the form of groves or tapered lands on the
outer portion. Filtered compressor discharge gas, maintained at a pressure slightly above
that of the process gas to be contained, is introduced into the seal area.
As the gas pressure and shaft rotation interact in normal operation,
the geometry on the rotating ring creates a dynamic gas pumping or "lifting"
effect which pushes the spring-loaded stationary ring away from the rotating ring. A
pressure dam effect created by the rings functions as the primary seal and breaks down the
gas pressure to just above atmospheric.
Each Job Thoroughly Evaluated
Important considerations of safety, performance, and reliability are
reflected in the application of every Dresser-Rand dry gas seal upgrade. We consider the
crucial aspects of each seal application including compression service and required
physical characteristics and fit for existing cavities.
A Full Service Solution
Dresser-Rand is your single source solution for dry gas seal
upgrades on compression equipment. We provide experienced project management, engineering
capabilities, and direct technical support. We handle total procurement, inspection,
compressor modifications, installation and start-up supervision for all seal upgrades.
Dresser-Rand’s experts in rotor dynamics, aerodynamics, thermodynamics, performance,
and seal systems design/technology work in concert to optimize your system.
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