Gas Compressor Station

Overview

A gas compressor station boosts pipeline pressure to keep gas moving over long transmission distances and to deliver it into higher-pressure systems. This package is a skid-mounted gas-turbine-driven centrifugal compressor train: a self-contained unit carrying the prime mover, compressor, all auxiliary oil and control systems, and a ventilated acoustic enclosure, designed to run unattended for long intervals between maintenance.

The centrifugal machine is chosen for high, steady throughput at moderate pressure ratio, which suits trunk-line duty better than reciprocating compression.

Construction

The whole train sits on the Skid & Acoustic Enclosure, a welded baseplate with machined mounting pads inside a sound-attenuating housing with forced ventilation. Power comes from the Gas Turbine Driver, a two-shaft turbine whose free power turbine drives the load independent of gas-generator speed, giving good part-load efficiency. Its output passes through the Speed-Increasing Gearbox, which matches power-turbine speed to the compressor through flexible disc couplings.

The Centrifugal Compressor is a barrel-cased rotor carrying six stacked impellers, with tilting-pad journal and thrust bearings and tandem dry gas seals that contain process gas without an oil barrier. Gas conditioning is handled by the Process Gas System: suction and discharge scrubbers remove liquids, a fast-acting anti-surge valve recycles flow to protect the machine at low rates, and check and relief valves guard the discharge.

Lubrication and seal supply come from the Lube & Seal Oil Console console with duplex filters and dual pumps. The Unit Control Panel runs turbine and compressor control, anti-surge logic and emergency shutdown, taking vibration and pressure inputs, while the Fire & Gas System system provides flame, gas and heat detection with clean-agent release.