Turbomachinery Package Specification | Taurus 60 Compressor Set and Mechanical Drive |
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The seal gas system consists of a primary and secondary gas face seal to prevent the escape of process gas for each shaft end. The primary dry seal takes the full pressure drop. It is used to provide the main sealing function. The secondary or backup seal acts as an emergency barrier between the process gas and the atmosphere and operates at a zero pressure differential.
The system can use clean and dry process gas or an independent clean and dry gas source as seal gas. A
The seal gas supply flow is higher than the primary seal leakage. The majority of the seal gas flow travels past the compressor shaft labyrinth seals and into the compressor case. This ensures the dry seal cavity is flushed with clean dry gas and that the dry seal operates in a clean environment. The seal gas may be supplied from the compressor discharge, preferably downstream of the gas cooler, provided the process gas is clean and dry.
The onskid duplex seal gas coalescing filters are designed for typical clean transmission pipeline conditions. If larger particle or liquid loads are expected, a larger
This is normally not a problem on clean transmission pipeline applications; however, it may be an issue on new pipelines during initial operation, or on pipelines handling wet and/or dirty gas. Under these conditions, an external
A circumferential buffer air or nitrogen
The separation gas source may be clean dry shop air, instrument air, or nitrogen. The system includes a hand valve for maintenance, a coalescing filter, a differential pressure regulator, and pressure switches and gauges to monitor the separation gas differential pressure. The system forms a positive separation between the lube oil and the dry seal. Flame arrestors are supplied for the primary and secondary vents. Leakage seal gas and separation gas must be piped away by the customer to selected safe areas.
© 2009 Solar Turbines Incorporated. All rights reserved. | TPS60CSMD/309 |
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