{"product_id":"heavy-duty-shop-tandem-model-no-t20312hc2-s","title":"Heavy Duty Shop Tandem - Model No.: T20312HC2-S","description":"\u003ch2\u003eCast Air Heavy Duty Shop Tandem Air Compressor — T20312HC2-S\u003c\/h2\u003e\n\u003cp\u003eThe T20312HC2-S pairs two 20 HP motors with HC2 cast iron pumps at 758 RPM on a 120-gallon horizontal ASME tank. Combined output is 180 CFM at 0 PSI and 140 CFM at 175 PSI. At $7,974, this is the entry point in the 20 HP tandem series and the most cost-effective way to get 140 CFM at working pressure in a piston compressor. The 120-gallon tank keeps the footprint compact relative to the output; the dual 20 HP pumps mean you are running with genuine production-level air capacity. This machine is built for body shops, fleet maintenance operations, automotive assembly lines, and any shop where air demand consistently outpaces what a 15 HP machine can supply.\u003c\/p\u003e\n\n\u003ch3\u003eWhat 140 CFM at 175 PSI Actually Means\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eA typical 1\/2-inch impact wrench needs 4–5 CFM at 90 PSI. You could run 28+ impacts simultaneously at 90 PSI with this compressor's output.\u003c\/li\u003e\n\u003cli\u003eA DA sander runs 12–14 CFM. You can run 10 DA sanders at once at full speed.\u003c\/li\u003e\n\u003cli\u003eA spray gun runs 10–15 CFM at 40–50 PSI. Multiple painters working simultaneously is no problem.\u003c\/li\u003e\n\u003cli\u003eThe point: at 140 CFM, you are not rationing air. Every tool in every bay can run at rated performance simultaneously.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCast Iron Pump Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll cast iron construction:\u003c\/strong\u003e Cylinders, heads, and crankcase on both pumps. Cast iron is the only material that makes sense for a compressor running at this load level for years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e758 RPM (HC2 configuration):\u003c\/strong\u003e The HC2 pump on a 20 HP motor runs at 758 RPM — slow enough that the compressor room stays tolerable to work near, and slow enough that heat buildup is not a constant maintenance issue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings:\u003c\/strong\u003e Both ends of each crankshaft. Required for sustained heavy-load operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision steel connecting rods:\u003c\/strong\u003e Automotive-type rod insert bearings at the crank, needle bearings at the wrist pin.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc and spring valves:\u003c\/strong\u003e The highest-wear item in any piston compressor. Cast Air's disc\/spring design is simpler to service than reed valves and holds up better under sustained high-output operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ring pistons:\u003c\/strong\u003e Higher volumetric efficiency, less oil carry-over into the discharge air.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e Loadless start on every cycle. At 20 HP per motor, a hard start is 40 HP of inrush current on your electrical service — the centrifugal unloader eliminates that.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTank and Controls\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e120-gallon horizontal ASME tank:\u003c\/strong\u003e Powder-coated, channel base. At 140 CFM of pump output, the 120-gallon receiver charges and recovers quickly. If your demand comes in intense bursts rather than a sustained draw, consider the 240-gallon T20324HC2-S for more buffer storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo magnetic motor starters — mounted and wired:\u003c\/strong\u003e Both motor starters factory-installed. Connect to 3-phase service and operate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME safety valves:\u003c\/strong\u003e Factory-set on both pump sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal belt guards:\u003c\/strong\u003e Fully enclosed on both pump assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper discharge and unloader tubes:\u003c\/strong\u003e No rubber hose on the hot side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1,725 RPM industrial motors:\u003c\/strong\u003e 15% service factor or higher. At 20 HP per side, these are substantial motors built for continuous industrial service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Factory-Mounted Options\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Oil Control (#6304x2M):\u003c\/strong\u003e Automatic oil-level shutdown on both pumps — essential at this horsepower level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHour Meter 230V (#HRM75x2M) or 460V (#HRM460x2M):\u003c\/strong\u003e Track runtime independently on each pump for scheduled maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternator Relay (#ALT230M or #ALT460M):\u003c\/strong\u003e Alternates lead pump automatically to equalize wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Auto Drain (#SDV03M):\u003c\/strong\u003e Timed solenoid condensate drain. The larger tank produces more condensate — the auto drain keeps it managed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Control (#DC2x2M):\u003c\/strong\u003e Start\/stop and throttle control modes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Noise Silencers (#SA100x4M):\u003c\/strong\u003e Reduces intake noise on both pumps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Tensioner (#215Dx2M for 7.5–10 HP; contact us for 20 HP spec):\u003c\/strong\u003e Self-tensioning motor base system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAftercooler (#BGAC1x2M, 70 CFM rated per unit):\u003c\/strong\u003e Belt-guard-mounted aftercooler on both pump sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll Options Package (#AOC2D):\u003c\/strong\u003e All asterisk options at 10% off combined price.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat Is in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo cast iron two-stage HC2 pump and motor assemblies (20 HP each) on a single rigid frame\u003c\/li\u003e\n\u003cli\u003e120-gallon horizontal powder-coated ASME tank with channel base\u003c\/li\u003e\n\u003cli\u003eTwo magnetic motor starters, mounted and wired at the factory\u003c\/li\u003e\n\u003cli\u003eTwo ASME safety valves\u003c\/li\u003e\n\u003cli\u003eTwo metal belt guards (fully enclosed)\u003c\/li\u003e\n\u003cli\u003eCopper discharge and unloader tubes on both sides\u003c\/li\u003e\n\u003cli\u003ePressure switch for each pump\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eOptional accessories are factory-installed at time of order and are not included unless specified at purchase.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eAvailable Configurations — 20 HP Shop Tandem Lineup\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eT20312HC2-S:\u003c\/strong\u003e 2×20 HP, 758 RPM, 180 CFM \/ 140 CFM @ 175 PSI, 120-gal — $7,974 (this unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT20312HC3-S:\u003c\/strong\u003e 2×20 HP, 570 RPM, 180 CFM \/ 140 CFM @ 175 PSI, 120-gal — $10,285 (slowest pump, quietest, longest life)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT20324HC2-S:\u003c\/strong\u003e 2×20 HP, 758 RPM, 180 CFM \/ 140 CFM @ 175 PSI, 240-gal — $9,460 (more buffer storage)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT20324HC3-S:\u003c\/strong\u003e 2×20 HP, 570 RPM, 180 CFM \/ 140 CFM @ 175 PSI, 240-gal — $11,610 (maximum configuration)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe HC2 and HC3 configurations produce the same combined CFM — the HC3 pump is physically larger and runs at 570 RPM vs. 758 RPM on the HC2. If your shop environment demands the quietest possible operation and maximum longevity between pump services, the HC3 is worth the additional cost. If noise is less critical, the HC2 delivers equivalent air output for less money.\u003c\/p\u003e\n\n\u003ch3\u003eWhen Does a Shop Need This vs. Stepping Up or Down?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep down to 15 HP tandem:\u003c\/strong\u003e If your peak demand is under 100 CFM and you have some recovery time, the 15 HP tandem lineup handles it for $1,000–3,000 less. The 20 HP tandem is for shops that genuinely need 140 CFM sustained, not shops that occasionally spike near it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis unit is right when:\u003c\/strong\u003e You operate a large body shop, collision repair center, or automotive production facility where air demand is consistently high. 140 CFM at 175 PSI runs a serious shop with headroom to spare.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up to 25–30 HP tandem:\u003c\/strong\u003e If 140 CFM is not enough — multiple spray booths, heavy air tools, large-volume tire inflation — the T25312HC2-S or T30312HC3-S deliver 180–210 CFM at 175 PSI on the same general platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsider 240-gallon tank:\u003c\/strong\u003e If your demand comes in intense bursts rather than a steady draw, the T20324HC2-S adds 120 gallons of receiver storage for $1,486 more.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications — T20312HC2-S\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e T20312HC2-S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 2 × 20 HP (40 HP total)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 758 (HC2 configuration)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 180 (combined, both pumps)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 140 (combined, both pumps)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Capacity:\u003c\/strong\u003e 120 gallons, horizontal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Type:\u003c\/strong\u003e ASME-certified, powder-coated, channel base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Speed:\u003c\/strong\u003e 1,725 RPM, 15% service factor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Type:\u003c\/strong\u003e Two-stage, all cast iron, centrifugal unloader\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControls:\u003c\/strong\u003e Two magnetic motor starters, mounted and wired\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge Tubing:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Guard:\u003c\/strong\u003e Metal, fully enclosed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $7,973.60\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Exact LxWxH dimensions and shipping weight for this configuration are not individually published by Castair. Contact us for freight details before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe have specialized in industrial air compressor sales since 2016. At the 20 HP tandem level, getting the right configuration matters — the difference between HC2 and HC3, and between 120 and 240-gallon tanks, is significant in both price and application fit. When you buy through us:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e to a commercial address with a loading dock or forklift\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support at 866-217-0063\u003c\/strong\u003e — we will help you confirm whether HC2 or HC3 is the right pump for your application\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Cast Air manufacturer warranty\u003c\/strong\u003e — we handle warranty claims directly with Cast Air\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest upgrade guidance:\u003c\/strong\u003e If the 15 HP tandem handles your load, we will tell you. If you need 25 HP, we will say that too.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342605246677,"sku":"T20312HC2-S","price":7973.6,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/heavy-duty-shop-tandem-model-no-t20312hc2-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}