The Castair D10324HC2-S is a 20 total horsepower duplex two-stage air compressor on a 240-gallon horizontal ASME tank, wired for three-phase electricity. It uses the HC2 pump at 758 RPM, delivers 70 CFM at 175 PSI combined, and weighs 1,760 lbs. Dimensions are 85" x 30" x 64". The magnetic starter is factory mounted and wired. This unit combines three-phase efficiency with maximum storage capacity at the HC2 pump speed — the right choice when you have three-phase service, need the output of dual 10 HP pumps, and want the largest standard tank in the 2x10HP three-phase lineup.
240-Gallon Tank: When Storage Matters
The 240-gallon receiver on the D10324HC2-S versus the 120-gallon on the D10312HC2-S is not just about having more air on tap — it is about duty cycle management. A larger tank means:
- Fewer pump start/stop cycles per hour, reducing motor start stress and wear
- More stable supply pressure during peak demand — paint sprayers and plasma cutters see less pressure sag
- Greater buffer for momentary high-draw events without immediate pump activation
For a busy collision shop running multiple spray guns simultaneously, or an industrial shop with several high-draw air tools, the 240-gallon receiver is the correct specification.
Pump and Motor Specifications
- Configuration: Duplex (two pumps, two motors)
- Total HP: 20 HP (2 x 10 HP)
- Phase: Three-phase
- Pump RPM: 758 (HC2 pump)
- CFM at 0 PSI: 90 CFM combined
- CFM at 175 PSI: 70 CFM combined
- Max Pressure: 175 PSI
- Stage: Two-stage
Tank and Physical Specs
- Tank Capacity: 240 gallons, horizontal ASME
- Dimensions (LxWxH): 85" x 30" x 64"
- Weight: 1,760 lbs
- Tank Finish: Powder coated
- Safety Valve: ASME rated, installed
- Magnetic Starter: Mounted and wired (factory installed)
Cast Iron Pump Features
- All cast iron construction for long service life and quiet operation
- 758 RPM HC2 pump — slow speed for extended valve life
- Tapered roller bearings at both crankshaft ends
- Precision steel connecting rods with automotive-type rod insert bearings
- Disc and spring valves for easy service and reliability
- 4-ring pistons for efficiency and reduced oil carry-over
- Centrifugal unloader for loadless starts
Three-Phase 2x10HP Duplex Comparison
- D10312HC2-S — 3-phase, 120gal, HC2 758 RPM, 85x28x57, 1,410 lbs
- D10312HC3-S — 3-phase, 120gal, HC3 570 RPM, 94x28x57, 1,740 lbs
- D10324HC2-S — 3-phase, 240gal, HC2 758 RPM, 85x30x64, 1,760 lbs (this unit)
- D10324HC3-S — 3-phase, 240gal, HC3 570 RPM, 94x30x64, 2,190 lbs — slowest pump, max storage
When Does a Shop Need This
The D10324HC2-S is the right choice when: Three-phase service is available, peak demand regularly exhausts a 120-gallon tank, and you want the larger storage of a 240-gallon system without the heavier HC3 pump package.
Step down to D10312HC2-S if your air usage is more intermittent and 120 gallons provides adequate buffer between cycles — save cost and floor space.
Step up to D10324HC3-S if noise level and maximum pump longevity are priorities — same 240-gallon tank, slower HC3 pump at 570 RPM.
Technical Specifications
- Model: D10324HC2-S
- Manufacturer: Castair (Cast Air, Inc.) — Spicer, Minnesota
- Total HP: 20 HP (2 x 10 HP)
- Phase: Three-phase
- Pump RPM: 758 (HC2)
- CFM @ 0 PSI: 90
- CFM @ 175 PSI: 70
- Tank: 240 gallon, horizontal, ASME, powder coated
- Dimensions (LxWxH): 85" x 30" x 64"
- Weight: 1,760 lbs
- Magnetic Starter: Included, factory mounted and wired
- Safety Valve: ASME rated, installed
Why Buy From Air Compressor Factory Direct?
We have been selling industrial air compressors since 2016 and can help you evaluate HC2 vs. HC3 and 120 vs. 240 gallon for your specific application. Free shipping on this unit, free technical support at 866-217-0063, and the full Castair manufacturer warranty.
Call 866-217-0063 for quick answers and help!
