November 2003

Special Report: Plant Safety and Environment

Dry gas seals and support systems: benefits and options

Follow these guidelines for proper specification, installation and maintenance

Saxena, M. N., Global Machinery Consultants Pty Ltd.

Since their introduction in the mid '70s, dry gas seals have revolutionized axial and centrifugal compressor sealing. Dry gas seals are installed in virtually every new compressor. Compared to traditional wet sealing, dry gas seals offer the following commercial advantages: On shutdown, pressurized containment of process gas is possible, reducing plant flaring Prevents oil contamination of compressed gases Reduced power consumption (conservatively >1%) Increased process train reliability/ availability Predictable rotor characteristic with consistent stability Reduced space requirements

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