Dry Gas Seals – Intermediate Labyrinth Buffering and Separation Gas Systems

Clean nitrogen must be supplied to intermediate labyrinths in a fashion similar to providing external seal gas to a double seal. A five micron (nominal) duplex filter arrangement with differential pressure indication and high alarm, pressure regulation, flow indication and a low supply pressure alarm are required. To reduce components and complexity, the filtration for the buffer system can also serve the separation gas system, however, independent flow measurement, pressure regulation and low pressure alarming are recommended. If separation gas is to be supplied independently (use of air or no buffering of intermediate labyrinth), filtration can be relaxed if a labyrinth-type separation seal is used.

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