Heavy Duty Shop Tandem - Model No.: T10324HC2-S

Cast Air Heavy Duty Shop Tandem Air Compressor — T10324HC2-S

The T10324HC2-S is a two-stage, twin-pump horizontal tandem from Cast Air built for shops that need serious air capacity without stepping up to a full rotary screw system. Two 10 HP motors drive two independent cast iron pumps, giving you 70 CFM at 0 PSI and 35 CFM at 175 PSI on a 240-gallon horizontal ASME tank — all on 3-phase power. At $8,150, this is a purpose-built machine for body shops, fleet maintenance bays, tire shops, and production environments where a single-pump industrial compressor runs out of steam before the day ends.

Why Two Pumps?

• Redundancy built in: If one pump requires service, the other keeps the shop running. With a single-pump machine, a failed valve or worn rings means downtime. With this tandem, you call for service without shutting down.
• Load sharing: Two 10 HP pumps running at moderate load run cooler and last longer than one 20 HP pump hammering at maximum capacity all day.
• Equal motor wear: Add an alternator relay (option ALT230M or ALT460M) and the two motors automatically swap lead duty each cycle, equalizing runtime hours between both sides.

Cast Iron Pump Features

• All cast iron construction: Pump cylinders, heads, and crankcase are cast iron for thermal stability and long service life — not aluminum that expands and contracts with temperature swings.
• 758 RPM pump speed (HC2 configuration): Slow RPM is the whole point. Cast Air sizes its pumps to run at well under 1,000 RPM, which means dramatically quieter operation compared to the 1,200–1,800 RPM pumps found in cheaper compressors.
• Tapered roller bearings: Both ends of the crankshaft ride on tapered roller bearings, not ball bearings. Superior load capacity and longer service intervals.
• Precision steel connecting rods: Automotive-type rod insert bearings at the crankshaft, needle bearings at the wrist pin. This is the same engineering found in diesel engines, not consumer equipment.
• Disc and spring valves: Easy to service in the field. Valves are the highest-wear item on any piston compressor — Cast Air uses a disc/spring design that outlasts reed valves and is straightforward to rebuild.
• 4-ring pistons: Better ring seal means higher efficiency and less oil carried over into the discharge air.
• Centrifugal unloader: Every start is loadless. The centrifugal unloader bleeds head pressure before the motor spins up, protecting both motors and pressure switches from repeated hard starts.

Tank and Controls

• 240-gallon horizontal ASME tank: Powder-coated for corrosion resistance. Channel base for level installation on a shop floor. The 240-gallon receiver keeps system pressure stable during peak demand — fewer pump cycles, less heat buildup.
• Magnetic motor starters — mounted and wired: Both motor starters are factory-installed and wired. Connect to your 3-phase service and go.
• ASME safety valves: Factory-set relief valves protect both pumps and the tank.
• Metal belt guard: Fully enclosed. Keeps hands, rags, and debris away from belts and pulleys.
• Copper discharge and unloader tubes: Cast Air uses copper tubing for discharge lines, not rubber hose. Copper handles heat better and does not degrade with oil exposure.
• Heavy-duty 1,725 RPM industrial motors: Full 15% service factor or higher. Rated for the actual duty cycle of an industrial shop.

Available Factory-Mounted Options

• Low Oil Control (#6304x2M): Shuts down the affected pump automatically if oil drops to a dangerous level. Essential for any unattended operation.
• Hour Meter — 230V (#HRM75x2M) or 460V (#HRM460x2M): Track actual runtime hours on each pump independently for scheduled maintenance.
• Alternator Relay (#ALT230M or #ALT460M): Automatically alternates which pump leads each cycle, equalizing wear between both units over time.
• Electronic Auto Drain (#SDV03M): Timed solenoid drains condensate from the tank automatically. Critical for air quality and tank longevity.
• Dual Control (#DC2x2M): Adds start/stop and constant pressure (throttling) control modes.
• Intake Noise Silencers (#SA100x4M): Reduces intake noise on both pumps.
• Belt Tensioner (#215Dx2M): Self-tensioning motor base system keeps belt tension consistent as belts break in and wear.
• Aftercooler (#BGAC1x2M, 70 CFM rated): Belt-guard-mounted aftercooler cools compressed air before the receiver, reducing condensate in the lines.
• All Options Package (#AOC2D): Order all asterisk options together and receive 10% off the combined option price.

What Is in the Box

• Two cast iron two-stage pump and motor assemblies, mounted on a single frame
• 240-gallon horizontal powder-coated ASME tank with channel base
• Two magnetic motor starters, mounted and wired at the factory
• Two ASME safety valves
• Two metal belt guards (fully enclosed)
• Copper discharge and unloader tubes on both pump sides
• Pressure switch for each pump

Optional accessories are factory-installed at time of order and are not included unless specified at purchase.

Available Configurations — Heavy Duty Shop Tandem Lineup

Cast Air builds the Shop Tandem series across a range of horsepower and tank sizes. All units are two-stage, 3-phase. CFM figures are combined output of both pumps:

• T10324HC2-S: 2×10 HP, 758 RPM, 70 CFM / 35 CFM @ 175 PSI, 240-gal — $8,150
• T15312HC1-S: 2×15 HP, 898 RPM, 110 CFM / 90.6 CFM @ 175 PSI, 120-gal — $6,675
• T15312HC2-S: 2×15 HP, 795 RPM, 123.4 CFM / 100.4 CFM @ 175 PSI, 120-gal — $7,639
• T15324HC1-S: 2×15 HP, 898 RPM, 110 CFM / 90.6 CFM @ 175 PSI, 240-gal — $8,121
• T15324HC2-S: 2×15 HP, 795 RPM, 123.4 CFM / 100.4 CFM @ 175 PSI, 240-gal — $9,173
• T20312HC2-S: 2×20 HP, 758 RPM, 180 CFM / 140 CFM @ 175 PSI, 120-gal — $7,974
• T20312HC3-S: 2×20 HP, 570 RPM, 180 CFM / 140 CFM @ 175 PSI, 120-gal — $10,285
• T20324HC2-S: 2×20 HP, 758 RPM, 180 CFM / 140 CFM @ 175 PSI, 240-gal — $9,460
• T20324HC3-S: 2×20 HP, 570 RPM, 180 CFM / 140 CFM @ 175 PSI, 240-gal — $11,610
• T25312HC2-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 120-gal — $8,292
• T25312HC3-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 120-gal — $10,924
• T25324HC2-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 240-gal — $9,826
• T25324HC3-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 240-gal — $12,458
• T30312HC3-S: 2×30 HP, 794 RPM, 256 CFM / 210 CFM @ 175 PSI, 120-gal — $11,730
• T30324HC3-S: 2×30 HP, 794 RPM, 256 CFM / 210 CFM @ 175 PSI, 240-gal — $13,233

When Does a Shop Need This vs. Stepping Up or Down?

• Step down to a single industrial unit: If your shop runs one spray gun, two air tools at a time, and shuts down at 5 PM, a single 10 HP industrial unit (I10312HC2-S) is the right call. The tandem adds cost and complexity you do not need.
• This unit is right when: You run a body shop with two painters working simultaneously, a fleet shop with four technicians sharing air, or any operation where a single 10 HP machine would short-cycle or run at near 100% duty cycle. The 240-gallon receiver absorbs demand spikes, and the second pump means you never lose production to a single pump failure.
• Step up to rotary screw: If you need truly continuous air — paint booths running nonstop, CNC equipment, or over 100 CFM sustained — look at Cast Air's rotary screw or rotary-piston hybrid line. The Shop Tandem piston series is for heavy intermittent demand, not 100% continuous duty.

Technical Specifications — T10324HC2-S

• Model Number: T10324HC2-S
• Horsepower: 2 × 10 HP (20 HP total)
• Phase: 3-phase
• Pump RPM: 758 (HC2 configuration)
• CFM @ 0 PSI: 70 (combined, both pumps)
• CFM @ 175 PSI: 35 (combined, both pumps)
• Tank Capacity: 240 gallons, horizontal
• Tank Type: ASME-certified, powder-coated, channel base
• Motor Speed: 1,725 RPM, 15% service factor
• Pump Type: Two-stage, all cast iron, centrifugal unloader
• Controls: Two magnetic motor starters, mounted and wired
• Discharge Tubing: Copper
• Belt Guard: Metal, fully enclosed
• Price: $8,150.40

Note: Exact LxWxH dimensions and shipping weight for this specific tandem configuration are not published by Castair on their website. Contact us for freight details before ordering.

Why Buy From Air Compressor Factory Direct?

We have specialized in industrial air compressor sales since 2016, and Cast Air is a core part of our lineup because their American-built, cast iron machines hold up in ways that import equipment does not. When you buy a Shop Tandem through us, you get:

• Free shipping to a commercial address with a loading dock or forklift
• Free tech support at 866-217-0063 — call before you buy to confirm the right horsepower and tank size for your shop's actual CFM demand. We will help you size it correctly.
• Full Cast Air manufacturer warranty — we handle warranty claims directly with Cast Air on your behalf
• Honest upgrade guidance: If the T10324HC2-S is overkill or not enough for your application, we will tell you. We would rather sell you the right machine than the wrong one twice.

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