Gas from the compressor discharge enters the port closest to the compressor (labyrinth end) and the majority of the gas enters the compressor thru this labyrinth. To assure that process gas, which is not treated by the dry gas system, does not enter the seal chamber, (velocities across the labyrinth should be maintained between 6-15 m/sec (20–50 ft/sec). It is the writer’s experience that considering labyrinth wear, the design should be closer to 15m/sec (50 ft/sec).
Tandem seals for saturated gas applications
The changes required for a saturated gas are solely in the seal system. A typical system incorporates a cooler, separator and heater in addition to the normal components used for a dry gas application to assure that saturated gas does not enter the seal chamber. Typical values for the cooler are to reduce the gas temperature to 30°F below the saturation temperature of the gas. The typical dimensions for the separator vessel, complete with a demister, are 460mm (18 inches) diameter and 1.8 meters (6 feet) high.
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