Castair 15 HP 3Phase Rotary Screw Air Compressor 58 cfm at 100 psi 120 Gal Vert Tank 460 R15312VG30

Cast Air 15 HP 460V 3-Phase Rotary Screw Air Compressor — 58 CFM at 100 PSI, 120-Gallon Vertical Tank (R15312VG30-460)

The Cast Air R15312VG30-460 delivers 58 CFM at 100 PSI from a 15 horsepower rotary screw pump, running on 460V 3-phase power. The 120-gallon tank is oriented vertically — same storage capacity as the horizontal version, in a smaller floor footprint. This is the right call when your shop demands the output of a full 15HP rotary screw system and your floor space doesn't accommodate the footprint of a horizontal tank.

The performance specs match the horizontal 460V variant (R15312HG30-460): 15HP, 58 CFM at 100 PSI, 460V 3-phase. What changes is the tank orientation and the resulting footprint. Everything else — the compressor pump, the motor, the output — is the same class of equipment.

Performance: 58 CFM at 100 PSI

• Spray gun capacity: An HVLP spray gun draws 12–18 CFM at the gun. At 58 CFM, two painters can work simultaneously with 20+ CFM remaining for other tools. A body shop painting one vehicle while prep work continues in an adjacent stall has adequate air supply without pressure drops.
• Impact wrenches: A 1/2" impact typically draws 4–5 CFM. A 3/4" or 1" impact draws 7–12 CFM. At 58 CFM, multiple impacts can run simultaneously. For a heavy-duty service bay working large commercial vehicles with 1" impacts, you have the CFM to handle it.
• Sustained throughput: Rotary screw compressors are continuous-duty machines. Unlike reciprocating piston compressors that require rest cycles to prevent overheating, this unit is designed to produce rated output all day without thermal protection shutdown during normal operation.
• 120-gallon storage buffer: The tank absorbs peak demand spikes. When multiple tools draw simultaneously and the combined CFM briefly exceeds 58, the tank volume provides the surplus rather than allowing system pressure to drop. Larger tanks mean fewer pressure recovery cycles and more consistent tool performance.

Vertical Tank Configuration: Floor Space vs. Plumbing Access

• Vertical saves floor space: A vertical 120-gallon tank stands upright. The footprint is smaller than an equivalent horizontal tank. In a shop where the compressor is tucked into a corner of the service bay, a mechanical room with limited square footage, or anywhere floor space is at a premium, vertical is the practical choice.
• Overhead air systems: If your shop runs an overhead air distribution ring or drops from ceiling mains, a vertical tank connects naturally. The supply outlet at the top of the tank connects directly to an overhead run without the angled plumbing a horizontal tank sometimes requires.
• Condensate management: Condensate drains from the bottom of the vertical tank at the lowest collection point. An auto-drain valve at the tank base is the standard install. The geometry works cleanly for automatic draining.
• When horizontal is the better choice: If your compressor room has a low ceiling, or if your plumbing plan needs easy access to multiple taps along the tank length, the horizontal version (R15312HG30-460) is more practical. Horizontal tanks allow plumbing taps at convenient heights along the full tank length.

460V 3-Phase: The Case for Industrial Voltage

• Half the amperage for the same power: At 460V, a 15HP motor draws roughly half the amperage of the same horsepower at 230V. Lower current means smaller wire gauge for the supply run, smaller breaker, and reduced heat in your electrical panel. For a compressor installed any distance from the main panel, 460V is the more efficient choice.
• Wire run economics: For a 100-foot run from panel to compressor at 15HP load, 460V allows you to use significantly lighter wire gauge than 230V. The wire savings alone can offset the cost difference between voltage configurations on longer runs.
• Facility compatibility: 460V 3-phase is standard in facilities that run heavy industrial equipment — frame straightening equipment, large CNC machines, industrial spray booths. If your facility already has 460V service, this unit integrates without adding a second voltage tier.
• 230V version available: If your shop runs 230V 3-phase and adding 460V is not practical, the R15312VG30-230 is the same vertical tank configuration at 230V. Same 15HP output, higher amperage draw, same physical footprint.

This Unit vs. the Rest of the 15HP Lineup

• R15312VG30-460 (this unit): 15HP, 460V, vertical 120-gallon tank. For shops with limited floor space and 460V 3-phase service.
• R15312HG30-460: 15HP, 460V, horizontal 120-gallon tank. Same CFM and pressure output. For shops where horizontal plumbing access matters more than floor footprint.
• R15312VG30-230: 15HP, 230V, vertical 120-gallon tank. Same physical configuration, different voltage. Choose if your service is 230V 3-phase.
• R15312HG30-230: 15HP, 230V, horizontal 120-gallon tank. The 230V counterpart to the horizontal 460V version.
• Stepping down (10HP range): A 10HP rotary screw delivers approximately 35–42 CFM. If your shop's peak concurrent tool demand stays below 35 CFM, 10HP is adequate and saves on purchase price and operating cost. If you are regularly pushing a 10HP unit to its limit, 15HP is the correct step.
• Stepping up (20HP+): Full collision centers with dedicated paint booths, active prep stalls, frame equipment, and multiple open bays running simultaneously may need 20HP or above. If 58 CFM at 100 PSI is your ceiling and you are consistently hitting it, the next tier up is worth evaluating.

Installation Notes

• 460V 3-phase required: Confirm your facility has 460V 3-phase service available before ordering. This is not a single-phase or residential unit.
• Ventilation: The compressor room must have adequate fresh air intake and exhaust. Rotary screw compressors generate significant heat under sustained load. Inadequate ventilation causes thermal shutdown and reduces component service life. Refer to the installation manual for minimum ventilation requirements.
• Air distribution: At 58 CFM output, supply mains should be sized appropriately — undersized pipe creates pressure loss between the compressor and the tools even when the unit is running correctly. A 3/4" to 1" supply main is typical for this CFM level on runs under 100 feet.
• Moisture management: A refrigerated air dryer downstream of the compressor is standard practice for spray painting and precision pneumatic work. Compressed air from any compressor carries moisture; removing it before it reaches the tools protects your equipment and your work.

Additional Specifications

Full technical specifications — exact full-load amperage at 460V, motor frame, discharge temperature, oil capacity, inlet and discharge port sizes, unit weight, and exact footprint dimensions — are available upon request. Contact us before ordering if you need the complete data sheet for installation planning, electrical permit applications, or equipment layout drawings.

Why Buy From OEM Diagnostic Tools?

• Specialist since 2016: We focus on professional shop equipment. We can walk through vertical vs. horizontal configuration, voltage selection, and installation planning based on your specific facility layout and service availability.
• Free shipping: Ships free to commercial addresses in the continental US.
• Free tech support: Call 866-217-0063 before you order to confirm the configuration. Call after delivery with installation questions. We support the equipment we sell.
• Full manufacturer warranty: Cast Air manufacturer warranty applies to this unit. We manage warranty claims on your behalf if an issue comes up.
• Honest recommendations: If vertical doesn't suit your layout, we'll steer you to horizontal. If 15HP is more than you need, we'll say so. If your application really requires 20HP, we'll tell you that instead of taking the order on the wrong unit.

Call 866-217-0063 for quick answers and help!