DGS-TL is a dry-running gas seal,it is a tandem gas seal,cartridge design,Uni-directional or bidirectional capability.The tandem seal with intermediate labyrinth consists of two single seals arranged in series separated by a labyrinth.
Tandem seals with intermediate labyrinth are suitable for medium- and high-pressure applications where leakage of process seal gas to the atmosphere is unacceptable. Seal gas is injected between the process side seal and the primary seal faces. The majority of the seal gas flows into the compressor and a slight amount flows across the primary seal faces. The seal gas pressure is reduced across the primary seal to primary vent pressure. The intermediate labyrinth provides a restriction between the primary and secondary seal. Secondary seal gas is supplied between the intermediate labyrinth and secondary seal to provide a barrier and prevent primary seal leakage from reaching the secondary seal. Leakage from the primary seal is diluted with secondary seal gas and routed to a vent system. Secondary seal leakage is reduced across the secondary seal to atmospheric pressure and typically routed to the atmosphere. In case of primary seal failure,the secondary seal is designed to operate at primary seal conditions, which prevents uncontrolled leakage to the atmosphere and achieves a safe shutdown of the compressor.DGS-TL can be used as a replacement for Burgmann DGS tandem seal with intermediate labyrinth type.John crane Type 28XP and Flowserve Gaspac L.
