Castair T10312HC1-S — 10 HP 3-Phase Tandem Air Compressor, 120-Gallon Horizontal
The Castair T10312HC1-S is a 10 horsepower, three-phase, two-stage tandem air compressor with a 120-gallon horizontal ASME tank and 767 RPM pump speed. If your facility has three-phase electrical service, this is your entry point into the 10 HP tandem lineup — and at $5,660.75, it is $899 less than the single-phase equivalent (T10112HC1-S). Three-phase motors are more efficient, generate less heat, and provide smoother operation than single-phase motors of equivalent HP, which is why industrial facilities have historically run three-phase wherever possible.
Two cast iron pumps operate off a single motor, delivering the higher combined output and built-in redundancy of the tandem configuration without the added cost of a second motor setup.
Technical Specifications
- Model: T10312HC1-S
- Horsepower: 10 HP
- Phase: 3-phase
- Configuration: Tandem — 2 pumps, 1 motor
- Stage: Two-stage compression
- Pump RPM: 767 RPM
- Tank: 120-gallon horizontal, ASME-certified
- Dimensions (LxWxH): 85 x 28 x 57 inches
- Weight: 1,085 lbs
- Motor Speed: 1,725 RPM industrial with 15% service factor
- Price: $5,660.75
Cast Iron Pump Construction
- All cast iron: Cylinders, heads, crankcase, and valve plates — cast iron throughout for heat dissipation and long service life
- Slow RPM operation: Lower speed means less heat, less noise, and longer life between rebuilds
- Tapered roller bearings: Both ends of each crankshaft for superior support and reduced friction
- Precision steel connecting rods: Automotive-type rod insert bearings at crankshaft and wrist pin for long service life
- Disc and spring valves: Stainless steel — approximately 10x the service life of standard reed valves, easy to service in the field
- 4-ring pistons: Better sealing, higher compression efficiency, less oil carry-over
- Centrifugal unloader: Load-free startup every time — the motor never has to start against tank pressure
Tank, Motor, and Controls
- Powder-coated ASME-certified horizontal tank with channel base
- ASME safety valves — code-compliant pressure relief installed
- Totally enclosed metal belt guard
- Copper discharge and unloader tubes
- Heavy-duty 1,725 RPM industrial motor with 15% service factor
- Magnetic motor starter: Mounted and wired from the factory (S designation)
What's Included
- Complete tandem compressor assembly (pumps, tank, motor, controls)
- Magnetic motor starter — factory mounted and wired
- Cast Air "Right from the Start" Kit
- ASME safety valve(s)
Why a Tandem vs. a Single-Pump Compressor
- Higher combined CFM output: Two pumps filling the tank simultaneously means faster recovery under continuous demand
- Redundancy: If one pump needs service, the other keeps running — a single-pump unit is either all or nothing
- Lower heat per pump: Neither pump runs at maximum stress — cooler operation extends pump life significantly
- Doubled pump service intervals: Runtime hours split between two pumps means each pump sees half the cycles
Shipping and Lead Time
These units ship within two weeks of order placement. Freight delivery time is additional and varies by location. All orders receive a courtesy call to confirm application requirements and ensure you have selected the correct configuration.
10 HP Tandem Lineup — Configuration Reference
- T10112HC1-S — 10 HP, 1-phase, 120 gal, 767 RPM ($6,560.05)
- T10112HC2-S — 10 HP, 1-phase, 120 gal, 420 RPM ($7,478.05)
- T10124HC1-S — 10 HP, 1-phase, 240 gal, 767 RPM ($8,023.75)
- T10124HC2-S — 10 HP, 1-phase, 240 gal, 420 RPM ($9,012.30)
- T10312HC1-S — 10 HP, 3-phase, 120 gal, 767 RPM ($5,660.75)
- T10312HC2-S — 10 HP, 3-phase, 120 gal, 420 RPM ($6,579.60)
- T10324HC1-S — 10 HP, 3-phase, 240 gal, 767 RPM ($7,194.15)
When Does a Shop Need the T10312HC1-S
This unit is the right choice when:
- You have three-phase electrical service and want to take advantage of the lower unit price vs. the single-phase equivalent
- Your shop runs 2–4 bays with consistent high-demand air use — 120 gallons is sufficient for most shop configurations at this HP
- You want the faster 767 RPM pump recovery over the slower 420 RPM C2 configuration
- Budget is a consideration — this is the lowest-priced unit in the 10 HP tandem lineup
Step up to the T10312HC2-S when: You have three-phase service but want quieter, slower 420 RPM pump operation (+$919).
Step up to the T10324HC1-S when: Your air demand requires 240 gallons of storage rather than 120 (+$1,533).
Consider the T10112HC1-S when: Your facility only has single-phase power.
Why Buy From Air Compressor Factory Direct?
- Authorized Cast Air dealer since 2016
- Free shipping included on this order
- Free technical support at 866-217-0063 — call before ordering to confirm phase, tank size, and CFM requirements for your application
- Full Cast Air manufacturer warranty
- Honest guidance: If a different configuration fits your shop better, we will tell you
Call 866-217-0063 for quick answers and help!
