UsedSpecifications
ManufacturerANGI Energy Systems
ModelNG-050-E-S-4-Z
ConditionUsed
Capacity75 SCFM
Pressure Rating5,000 PSIG
Gas ServiceCNG, Natural Gas, Compressed Air
Previous ServicePrevious CNG service
Hydro Test Expiry2028
LocationWaxahachie, TX, United States
Stock #GE4S-1235
Description
ANGI NG-050-E-S-4-Z compressor decommissioned in 2025 due to warehouse expansion, 14,400 hours on the clock with all required periodic maintenance completed. Unit compresses natural gas from 9–13 PSI suction to 4,500 PSI discharge at 75 SCFM, rated for 5,000 PSI MAWP, driven by a 50 HP Baldor-Reliance motor. PRVs recertified through 07/2028, complete documentation including books, schematics, operational and maintenance manuals, and CDs included. Available individually or as part of a complete station package with matching starter panel, dryer, priority panel, and dispenser.
Flow Capacity: 75 SCFM
Discharge Pressure: 4,500 PSI
MAWP: 5,000 PSI
Suction Pressure Range: 9–13 PSI
Operating RPM: 1785
Motor:
Manufacturer: Baldor-Reliance Super E
Horsepower: 50 HP
Voltage: 230/460/190/380 VAC
Amperage: 116/58/138/69 A
RPM: 1775 / 1470
Efficiency: 94.5%
Enclosure: TEFC
Frame Size: 326T
Electrical System:
Primary Supply: 120 VAC, 10 Amps, 60 Hz, 1 Phase
Secondary Supply: 24 VDC, 5 Amps
Control Panel: UL Listed for Hazardous Locations
Short Circuit Rating: 5kAIC
Hazardous Area Classification:
Class I, Division 2, Group D, T3C (compressor skid)
Class I, Division 2, Groups A, B, C, D (control panel)
Additional Components:
Filter: Parker HN6S-3PUN, 1-1/2” NPT Interceptor Housing (500 PSIG Max, 175°F Max Temp)
Surge Tank: Manchester Tank, 30 Gallon, MAWP 200 PSI @ 400°F, CRN F2151.1C
Fuse Chart: Included with part numbers and amperage ratings for each fuse position
Safety Features:
Emergency Stop
System Fault and Compressor Fault Indicators
Keyed Compressor Start/Stop Control
Intrinsically Safe Extensions for Class 1, Div 2, Group D
Certifications & Compliance:
NFPA 52
CSA 12.8 ANSI/IAS NGV 4.8
Article 500 of NFPA-70
UL & MET Listed
This compressor could be purchased individually or as a part of the entire station set up together with matching starter panel, dryer, priority panel and dispenser. ANGI 50 is arguably one of the most popular and reliable CNG compressors with many of the units still in use with 50,000+ of hours.
Questions buyers ask
What capacity and discharge pressure does it actually deliver?
This unit delivers 75 SCFM at 4,500 PSI discharge pressure from a 9–13 PSI suction supply, with a maximum allowable working pressure of 5,000 PSI. The NG-050 model designation indicates ANGI's 50 HP frame, which in this configuration targets light-duty fleet fueling or time-fill applications rather than fast-fill.
What drive, power and cooling does it require?
The compressor is driven by a 50 HP Baldor-Reliance Super E motor (1775 RPM, TEFC, 94.5% efficiency) with multi-voltage capability: 230/460/190/380 VAC at 116/58/138/69 amps respectively. Control systems require 120 VAC single-phase at 10 amps and 24 VDC at 5 amps. CNG compressors in this class are typically air-cooled via fan and require adequate ventilation; confirm ambient temperature limits and whether any intercooler or aftercooler maintenance has been performed at this hour interval.
What are the running hours and what has been rebuilt?
The unit shows 14,400 hours with all required periodic maintenance completed per the listing, and PRVs recertified through July 2028. No specific rebuild history is mentioned—ask the seller for valve, packing, and piston ring replacement records, as reciprocating CNG compressors typically require valve service every 8,000–12,000 hours and piston components between 15,000–20,000 hours depending on gas quality and duty cycle.
What should I inspect on a used compressor before buying?
Inspect all four stages for valve leakage, scoring on piston rods, and packing condition; run the unit under load and monitor interstage pressures, temperature rise, and vibration. Check the crankcase oil condition and sample for metal particulate, verify PRV pop-off pressures match nameplate settings, and review maintenance logs for compressor faults, unplanned shutdowns, or gas quality issues that may indicate hidden wear. Confirm the Parker inlet filter element condition and verify the surge tank and all pressure vessels have current inspection stamps if your jurisdiction requires periodic requalification.
General guidance for this type of equipment. Ask about this specific unit in your inquiry — the seller answers directly.
Inspection, shipping & payment
Inspection
Pre-purchase inspections are welcome during normal business hours by appointment arranged in advance. We can provide complimentary transportation from DFW Airport and back if you would like to send someone to see the equipment in person. We can also walk through the item over a video call for domestic or international buyers. We are on US Central Time.
Shipping and loading
The equipment is located at our yard south of Dallas, Texas. We can assist with shipping arrangements.
Loading is provided at no charge for equipment under 15,000 lb when scheduled in advance. Equipment over 15,000 lb requires a crane, which is arranged and paid for by the buyer.
Payment
Payment in full is required FOB our yard in South Dallas. A verifiable cashier's check is accepted for collection in person. For release to a third-party shipper we require a wire transfer cleared in our account before the equipment leaves the yard.
Terms set by Gas Equipment 4 Sale.
