3 Phase Greenfield Compressor Lot W/ Gas Dryer and Greenfield Fuel Dispenser

What capacity and discharge pressure does it actually deliver?

The Greenfield C4T 123 2 GPC compressor is rated for 137 SCFM (232 M³/h) at 5,000 PSI discharge pressure with a 45 PSI inlet. The system includes a matching Greenfield SG2.1316 dispenser rated for 5,000 PSI maximum inlet with a 2.5 lbs/min flow rate, which is typical for light-duty CNG vehicle fueling applications.

What drive, power and cooling does it require?

The compressor requires 480V three-phase 60Hz power at 335 full-load amps, with a 250 HP motor driving 173 kW total. The Xebec dryer skid draws an additional 22 amps at 480V three-phase, and the dispenser operates on 120 VAC 10A. The listing does not specify the cooling configuration, so confirm whether this is air-cooled or requires a water supply and what GPM and temperature range are needed.

What are the running hours and what has been rebuilt?

The seller reports the system was in full production operation until decommissioning, but the listing does not provide operating hours, maintenance records, or rebuild history. For natural gas compression at this duty cycle, valve and ring replacement intervals typically fall between 8,000 and 16,000 hours depending on gas quality and operating pressure—request the hour meter reading, last major service date, and any documentation of valve, piston, or seal work.

What should I inspect on a used compressor before buying?

Inspect cylinder bore condition with a borescope, check valve seats and springs for wear or carbon buildup, and examine all high-pressure tubing and fittings for corrosion or previous leak repairs. On CNG systems like this, verify the dryer desiccant condition, test all pressure switches and safety shutdowns, confirm the dispenser breakaway and nozzle components are intact, and request a witnessed run under load to verify discharge pressure, flow rate, vibration levels, and oil carryover. Review the compressor oil analysis history if available, as contamination or viscosity breakdown indicates internal wear that may not be visible externally.