IMW50 CNG Compressor - 90 SCFM. 50HP, 30-40psi inlet 4500 PSI Discharge

What capacity and discharge pressure does it actually deliver?

This unit delivers 90 SCFM at 40 PSI inlet pressure and 4,500 PSIG discharge at 1,230 RPM. CNG compressor output is inlet-pressure dependent; capacity will drop with lower inlet pressure and increase slightly with higher inlet (30-40 PSI range noted). The listing does not specify capacity at the lower 30 PSI inlet condition, so confirm actual flow at your expected inlet pressure with the seller.

What drive, power and cooling does it require?

The skid is driven by a 50 HP electric motor rated 460V, 86A, 3-Phase, 60Hz. The listing does not specify the cooling method (air-cooled or water-cooled) or list aftercooler details, so verify cooling system type, water flow requirements if applicable, and ambient temperature limits with the seller before installation planning.

What are the running hours and what has been rebuilt?

The unit came out of operational service in March 2026 but the listing does not provide running hours, valve or packing service history, or rebuild records. On CNG compressors, valves and packing typically require service every 4,000-8,000 hours depending on gas cleanliness and operating pressure, so request hour meter readings and maintenance logs to assess remaining service life.

What should I inspect on a used compressor before buying?

Inspect compression cylinders for scoring, check valve seats and springs for wear or carbon buildup, and verify packing and rider bands show acceptable leakage. Examine crankcase oil for metal contamination, check belt or coupling condition, confirm motor insulation resistance, and review all pressure relief valves for current certification dates. Request oil analysis results if available and consider third-party NDT on high-pressure components if no recent inspection records exist.