The Castair I15312VC2-S is a 15-horsepower, 3-phase industrial air compressor on a 120-gallon vertical tank with the C2 pump running at 898 RPM and a factory-mounted magnetic motor starter. The vertical tank sits at 44x30x75 inches — the most compact floor footprint in the 15HP 3-phase line while still holding 120 gallons. At 980 lbs and delivering 45.3 CFM at 175 PSI, this is the right choice for high-demand shops that need maximum air storage in a vertical footprint.
Who Needs This Compressor
Production shops, busy automotive facilities, and industrial operations on 3-phase power where the compressor runs continuously and ceiling height is available. The I15312VC2-S is a meaningful upgrade from a 10HP unit — it delivers 45.3 CFM at 175 PSI versus 35.0 CFM for the 10HP line, and the 15HP motor can sustain that output under continuous load without the thermal stress that pushes a 10HP unit into the red under heavy demand. If your 10HP compressor is cycling on and off constantly or struggling to maintain pressure under your current tool load, this is where you step up.
If you need the horizontal orientation for ceiling clearance or layout reasons, the I15312HC2-S delivers identical specs in a horizontal 120-gallon package at 69x24x50 inches.
Pump Features
- All cast iron construction — cylinders, heads, crankcase.
- 898 RPM pump speed — within the industrial slow-speed range. Cooler and slower than budget compressors at 1100-1200 RPM.
- Tapered roller bearings at both ends of the crankshaft.
- Steel connecting rods with automotive-type insert bearings.
- Disc and spring valves.
- 4-ring pistons.
- Centrifugal unloader.
Tank, Motor, and Controls
- 120-gallon vertical ASME tank — powder coated, four legs, 44x30x75 inches.
- ASME safety valve.
- 1725 RPM industrial 15HP motor — 15% service factor minimum.
- Totally enclosed metal belt guard.
- Copper discharge tube or stainless-steel braided flex line.
- Magnetic motor starter — included, factory mounted.
15HP 3-Phase Line Comparison
- I15312VC2-S (this unit) — 120-gallon vertical, C2 (898 RPM), 45.3 CFM @175 PSI, 44x30x75 in., 980 lbs, with starter.
- I15312HC2-S — 120-gallon horizontal, C2 (898 RPM), 45.3 CFM @175 PSI, 69x24x50 in., 980 lbs, with starter.
- I15312VC3-S — 120-gallon vertical, C3 (795 RPM), 50.2 CFM @175 PSI, 44x30x82 in., 1185 lbs, with starter.
- I15312HC3-S — 120-gallon horizontal, C3 (795 RPM), 50.2 CFM @175 PSI, 69x24x62 in., 1185 lbs, with starter.
Technical Specifications
- Model Number: I15312VC2-S
- Horsepower: 15 HP
- Phase: 3-phase
- Tank Capacity: 120 gallons, vertical
- Pump RPM: 898
- CFM @ 0 PSI: 55.0
- CFM @ 175 PSI: 45.3
- Max Pressure: 175 PSI
- Dimensions (LxWxH): 44 x 30 x 75 inches
- Weight: 980 lbs
- Motor Speed: 1725 RPM
- Motor Service Factor: 15% minimum
- Tank Certification: ASME
- Magnetic Starter: Included (factory mounted)
- Pump Configuration: C2
Why Buy From Air Compressor Factory Direct?
We have specialized in industrial air compressors since 2016. If you are sizing up from a 10HP unit or choosing between the C2 and C3 15HP configurations, call us and we will walk through the CFM numbers against your tool list. Free shipping, free pre-sale technical support, full manufacturer warranty.
Call 866-217-0063 for quick answers and help!
