Castair Heavy Duty Shop Tandem Air Compressor — Model T30324HC3-S
The Castair T30324HC3-S is a 30 HP, three-phase, two-stage tandem air compressor designed for large shops and industrial applications that demand serious air volume. This tandem configuration uses two cast iron pumps driven by a single motor mounted on a 240-gallon horizontal ASME tank. At 30 horsepower, this is a workhorse built for continuous-duty environments where downtime is not an option.
Specifications:
| Horsepower | 30 HP |
| Phase | Three Phase (3-Phase) |
| Configuration | Tandem — 2 pumps, 1 motor |
| Stage | Two-Stage |
| Pump RPM | 795 |
| Tank | 240 gallon, horizontal |
| Dimensions (LxWxH) | 94 x 30 x 68 inches |
| Weight | 2,210 lbs |
| Power | Electric |
Built with Cast Iron — Not Aluminum:
Castair pumps are made of cast iron, not aluminum. They are oil-lubricated, not oil-less, and they run at slow RPMs (795 RPM on this model). That means less heat, less wear, and a significantly longer service life compared to the high-speed aluminum compressors flooding the market. The name says it all — CASTAIR — cast iron air.
Cast Iron Pump Features:
- All cast iron construction for long life and quiet operation
- Slow RPM from 420 to 995 for quiet operation and extended service life
- Tapered roller bearings at both ends of the crankshaft for superior support and less friction
- Precision steel connecting rods with automotive-type rod insert bearings at the crankshaft and bearings at the wrist pin
- Stainless steel disc and spring valves for easy service, higher efficiency, and reliability
- 4-ring pistons for higher efficiency and less oil carry-over
- Centrifugal unloader for load-less start-up every time
Tank, Motor, and Controls:
- Powder-coated ASME-certified 240-gallon horizontal tank
- ASME safety valves
- Totally enclosed metal belt guard
- Copper discharge and unloader tube
- Heavy-duty 1,725 RPM industrial motor with full 15% service factor
Included with Every Tandem Series Compressor:
All Tandem Series (piston-driven) compressors come with the Right from the Start Kit included.
Shipping and Order Confirmation:
This unit will ship within two weeks of order placement. All orders receive a courtesy call to confirm conditions and application to ensure the correct product has been purchased.
Castair. Compressors Built Like They Used to Be.
Family owned and operated since 1991.
Call 866-217-0063 for quick answers and help!
Frequently Asked Questions
What is a tandem compressor and how does it differ from a duplex unit?
A tandem compressor like the T30324HC3-S uses two pump heads driven by a single motor on one crankshaft, whereas a duplex has two completely independent pumps and motors on the same tank. On the T30324HC3-S, the 30 HP motor drives both cast iron pump heads simultaneously for continuous-duty output — you get the airflow of two pumps without the added complexity of two motors, two starters, or alternating controls. For shops that need sustained high-CFM output without the lead/lag cycling of a duplex, tandem is the right call.
What are the electrical requirements for the T30324HC3-S?
The T30324HC3-S requires 3-phase power to run the 30 HP motor — this is not a single-phase unit. You will need a properly sized disconnect, breaker, and wire gauge rated for a 30 HP 3-phase load at your incoming voltage (typically 208-230/460V; confirm your specific voltage configuration before ordering). A licensed electrician should verify your service capacity and run a dedicated circuit, as undersized wiring is the most common cause of startup and thermal-overload issues on compressors in this class.
How much floor space does the T30324HC3-S require, and what clearance is needed around it?
The 240-gallon horizontal tank makes this a large footprint unit — plan for roughly 8 to 9 feet of length and ensure a minimum of 24 inches of clearance on all service sides for belt, valve, and filter access. The compressor should be installed on a level concrete floor capable of supporting the unit's filled weight, and keep it away from heat sources and areas where airborne debris or moisture can be pulled into the intake. Cast Air builds these in Spicer, MN for industrial environments, but proper placement directly impacts pump longevity and cooling efficiency.
When does a tandem setup like the T30324HC3-S make more sense than a standard single-pump unit?
The T30324HC3-S is the right choice when you need high sustained CFM output — production shops, tire service bays, sandblasting, or multi-tool operations where a single-pump unit would run at or near 100% duty cycle. The tandem configuration delivers more displacement per HP than a single-pump design of equivalent horsepower, and the all cast iron construction from Cast Air means it holds up under the heat and wear that come with continuous use. If your current compressor is struggling to keep up with peak demand or cycling constantly, this model is sized for that workload. Call us at 866-217-0063 and we can walk through your CFM requirements to confirm the T30324HC3-S fits your application.
What does routine maintenance on the T30324HC3-S involve?
Cast Air's cast iron pumps are designed for straightforward maintenance: regular oil changes on the pump crankcase (intervals per Cast Air spec, typically every 500 hours or annually under normal use), belt tension checks, air filter inspection, and manual drain or auto-drain servicing on the 240-gallon tank to prevent water accumulation. Because it's a tandem with a single motor, you have one set of belts and one motor to maintain rather than the two of a duplex, which reduces scheduled service time. Cast Air has been building these in Spicer, MN since 1991 with parts availability in mind — valve kits, rings, and gaskets are stocked and serviceable in the field.
