Cast Air R20312VG30 — 20 HP Rotary Screw Air Compressor, Vertical 120-gallon Galvanized Tank, 230V/460V 3-phase
The Cast Air R20312VG30 is a 20 HP oil-injected rotary screw air compressor built for shop environments where air demand is continuous and a piston compressor has become the limiting factor. At $12,271.45, this unit is designed for commercial and industrial users who have outgrown reciprocating technology and need a compressor that runs as long as the shop does.
Manufacturer specifications for this model are pending — contact us at 866-217-0063 for confirmed CFM output, operating pressure settings, full dimensions, and weight before ordering.
Rotary Screw vs. Reciprocating Piston: Why It Matters for Your Shop
Most small shops start with a reciprocating piston compressor. It works — until it doesn't. Piston compressors are designed for intermittent duty: they run, build pressure, shut off, and cool down. In a busy shop, they run more than they rest, leading to accelerated wear, overheating, and premature failure. A rotary screw compressor operates on a fundamentally different principle.
- 100% Duty Cycle: A rotary screw compressor can run continuously without a mandatory cool-down period. If the shop needs air all day, the compressor delivers air all day.
- Oil-Injected Screw Element: Oil is continuously injected into the compression chamber to cool, seal, and lubricate the twin-screw rotors. This eliminates the metal-to-metal contact and friction heat that wears out piston rings and valves over time.
- Lower Noise: Rotary screw compressors run quieter than piston compressors of equivalent output. The continuous rotation of helical screws produces less vibration and lower peak noise than reciprocating pistons. Exact dB rating for this model is pending from Cast Air — contact us for current data.
- Cleaner Air: Oil-injected screw compressors include an oil separator that removes the vast majority of oil carry-over from the compressed air stream. For most shop air tools and inflation uses, the output is clean enough without additional filtration. For spray painting or other sensitive applications, a downstream coalescing filter is still recommended.
- Longer Service Life: With fewer wear components under continuous stress, a well-maintained rotary screw compressor routinely outlasts multiple piston compressor lifecycles in the same application.
Who This 20 HP Unit Is For
A 20 HP rotary screw compressor is sized for a serious production shop — 4 to 6 bays running simultaneously. Impact wrenches, air ratchets, HVLP spray systems, air-powered lifts, and sandblasting all become practical. This is where the 100% duty cycle advantage over piston compressors becomes critical: production lines and busy alignment/tire shops simply cannot afford the cool-down cycles a piston unit demands.
Expected Performance Range
Typical CFM output for a 20 HP rotary screw compressor falls in the 80 to 95 CFM range at 100 PSI, though confirmed specifications for this model are pending from Cast Air. Contact us at 866-217-0063 for verified performance data.
Note: Confirmed CFM, operating pressure range, and full technical specifications for model R20312VG30 are pending from Cast Air. Do not finalize installation planning based on class-typical estimates. Call 866-217-0063 for current manufacturer data.
Key Features
- 100% Continuous Duty Cycle: No mandatory rest periods — runs as long as demand requires
- Oil-Injected Twin-Screw Element: Efficient, cool, and long-lived compression with minimal oil carry-over
- Thermal Protection: Automatic shutdown on high temperature protects the motor and screw element from heat damage
- Galvanized Air Receiver Tank: Corrosion-resistant tank interior extends service life in humid shop environments
- Integrated Air/Oil Separator: Removes oil from the compressed air stream before delivery
- Pressure Regulation: Adjustable pressure settings to match shop tool requirements — confirmed range pending from Cast Air
- Heavy-Duty Motor: 20 HP industrial motor rated for continuous commercial operation
- Safety Relief Valve: Factory-installed over-pressure protection
Voltage Options: 208V, 230V, and 460V 3-Phase
The R20312VG30 is configured for 230V/460V 3-phase power, and is also available in 230V or 460V 3-phase. Three-phase power is standard in commercial and industrial shops and delivers smoother motor operation, lower amperage draw per leg, and longer motor service life compared to single-phase equivalents at this horsepower.
- 208V 3-Phase: Common in facilities served by a 208Y/120V utility transformer — typical in older commercial buildings and many metropolitan areas
- 230V 3-Phase: Most common commercial 3-phase voltage in North America — if your shop has a standard 3-phase panel, this is likely your configuration
- 460V 3-Phase: Preferred for larger installations where running lower amperage reduces wiring cost and voltage drop over long runs — common in industrial facilities
If you are unsure which voltage your facility uses, check your panel or ask your electrician before ordering. Ordering the wrong voltage configuration is a common and avoidable mistake. Call us at 866-217-0063 and we will help you confirm the right unit for your service.
Manufacturer Specifications — Pending
Cast Air has not yet provided confirmed technical data sheets for model R20312VG30 through our system. The following information is pending and will be updated when received:
- Confirmed CFM at 100 PSI and at max pressure
- Maximum operating pressure (PSI)
- Full unit dimensions (L x W x H) and shipping weight
- Motor amp draw and recommended breaker size
- Oil type and capacity
- Noise level (dBA)
- Warranty terms
Do not finalize electrical panel planning, plumbing layout, or installation without confirmed specifications. Contact us at 866-217-0063 and we will get you the current data sheet directly from Cast Air.
Why Buy From OEM Diagnostic Tools?
OEM Diagnostic Tools has been a specialist equipment supplier since 2016. We carry commercial and industrial air compressors alongside diagnostic equipment because shops need reliable compressed air to run the tools that keep vehicles on the road. When you buy through us, you get:
- Free Shipping: On qualifying orders to the contiguous United States
- Free Technical Support: Call 866-217-0063 with pre-sale questions, spec confirmations, or voltage configuration questions — we will give you a straight answer
- Full Manufacturer Warranty: Your unit ships with the complete Cast Air warranty, not a reduced third-party warranty
- Honest Buying Guidance: If this model is not the right size for your shop, we will tell you. We would rather help you buy the right compressor than sell you the wrong one.
Call 866-217-0063 for quick answers and help!
