DGS-CD is a dry-running gas seal for centrifugal compressors. It features a double-ended gas seal and a cartridge design. It supports both unidirectional and bidirectional operation.
The double-ended dry gas seal consists of two single seals in an opposed configuration. It suits low-pressure applications where process gas leakage to the atmosphere is unacceptable.
Seal gas enters between the opposed seals at a pressure above the process gas pressure. Leakage from the primary seal enters the compressor or process system. Any buffer gas also enters the compressor or process system.
Leakage from the secondary seal typically vents to the atmosphere. If the primary seal fails, the secondary seal operates under primary seal conditions. This design prevents uncontrolled process gas leakage to the atmosphere.
Labyrinth and carbon ring separation seals are optionally available. DGS-CD can replace Burgmann DGS double seal types, John Crane Type 28 series, and Flowserve Gaspac L.
Interface Details
● A Buffer Gas Nitrogen/Process gas, nitrogen is preferred
● B Seal Gas Nitrogen/Another inert gas, nitrogen is preferred
● C Leakage Vent to safe location
● D Separation Gas Nitrogen/Instrument air, nitrogen is preferred
Applications
● Rich Gas Compressor
● Flare Gas Compressor
● De-adsorption Gas Compressor
