Complete CNG Station Package ANGI 50 – 50 HP / 75 SCFM @ 9 PSI Inlet to 5,000 PSI

What capacity and discharge pressure does it actually deliver?

This ANGI NG-050-E/S-4-Z compressor is rated for 75 SCFM at 9 PSI inlet to 5,000 PSI discharge. The listing does not specify whether this is continuous-duty rating or peak capacity, so confirm with the seller whether this flow rate applies to sustained time-fill operation or intermittent fast-fill cycles. CNG compressors typically see capacity derating under continuous duty or when filling from storage rather than directly from the inlet line.

What drive, power and cooling does it require?

The system uses a 50 HP motor powered by a 480V 3PH / 60Hz dual motor starter panel rated for 162.4A full load. The compressor has integrated cooling, though the listing does not specify whether this is air-cooled or water-cooled, which affects site installation requirements. The package includes a Hevi-Duty 5 kVA transformer for control power and a UL Type 3R outdoor-rated enclosure.

What are the running hours and what has been rebuilt?

The compressor has 14,000 hours with full maintenance records. The listing states that all pressure release valves were recertified in August 2025, but does not detail whether valve or ring work has been performed. Ask the seller for the maintenance records to verify whether cylinder heads, piston rings, or discharge valves have been replaced at typical service intervals.

What should I inspect on a used compressor before buying?

Verify discharge valve condition by checking for blow-by or excessive heating during a witnessed run test, and inspect piston rings by monitoring interstage pressures against the manufacturer's curve. Pull oil samples to check for metal particulate, examine the dryer desiccant for contamination or channeling, and verify that all PRVs hold at set pressure. The seller has maintenance records—review them for timing of valve replacements, ring changes, and bearing service, then cross-check actual interstage pressures and vibration levels against baseline readings from those service events.