{"product_id":"heavy-duty-shop-tandem-model-no-t15312hc2-s","title":"Heavy Duty Shop Tandem - Model No.: T15312HC2-S","description":"\u003ch2\u003eCast Air Heavy Duty Shop Tandem Air Compressor — T15312HC2-S\u003c\/h2\u003e\n\u003cp\u003eThe T15312HC2-S runs two 15 HP motors at 795 RPM — the slower, larger HC2 pump configuration — on a 120-gallon horizontal ASME tank. Combined output is 123.4 CFM at 0 PSI and 100.4 CFM at 175 PSI. At $7,639, this is the higher-CFM choice in the 15 HP tandem lineup on a 120-gallon tank. The HC2 pump runs slower than the HC1 (795 RPM vs. 898 RPM), which means less heat, quieter operation, and longer pump life — and more CFM per displacement because the pump is physically larger. If your shop consistently runs close to its air capacity limit, the HC2 configuration is the one to buy.\u003c\/p\u003e\n\n\u003ch3\u003eHC1 vs. HC2 — What Does It Mean?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHC1 (898 RPM):\u003c\/strong\u003e Standard Cast Air pump at a moderate speed. Good for shops with intermittent peak demand and adequate recovery time. 110 CFM combined on the 15 HP tandem.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHC2 (795 RPM):\u003c\/strong\u003e Larger cast iron pump running at a slower RPM. More CFM (123.4 combined), quieter operation, longer pump life between rebuilds. The HC2 is what you want when the compressor is running hard most of the day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRule of thumb:\u003c\/strong\u003e If you expect the compressor to be cycling more than 60–70% of the time, the HC2 pays for itself in reduced maintenance intervals and lower operating noise.\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. Cast iron handles heat and pressure cycles that aluminum cannot sustain over tens of thousands of hours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e795 RPM pump speed:\u003c\/strong\u003e Slow RPM is the core of Cast Air's design philosophy. The HC2 pump runs at 795 RPM — quiet enough to have a conversation near the compressor room, unlike the shrieking import units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings:\u003c\/strong\u003e Both ends of the crankshaft. Superior to ball bearings for radial and axial load at sustained compressor duty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision steel connecting rods:\u003c\/strong\u003e Automotive-type rod insert bearings at the crankshaft, 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 valves are easy to inspect and rebuild in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ring pistons:\u003c\/strong\u003e Better ring seal, higher efficiency, less oil carry-over.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e Loadless start on every cycle. Extends motor and pressure switch life significantly over hard-start designs.\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. Right-sized for the HC2 pump's recovery rate — the faster CFM output means this tank stays charged under most shop demand patterns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo magnetic motor starters — mounted and wired:\u003c\/strong\u003e 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 sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal belt guards:\u003c\/strong\u003e Fully enclosed on both assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper discharge and unloader tubes:\u003c\/strong\u003e Copper throughout — 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.\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 Auto-shutdown on low oil for both pumps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHour Meter 230V (#HRM75x2M) or 460V (#HRM460x2M):\u003c\/strong\u003e Track runtime independently on each pump.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternator Relay (#ALT230M or #ALT460M):\u003c\/strong\u003e Alternates lead pump automatically each cycle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Auto Drain (#SDV03M):\u003c\/strong\u003e Timed solenoid condensate drain.\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 (#254Dx2M for 15 HP):\u003c\/strong\u003e Self-tensioning motor base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAftercooler (#BGAC1x2M, 70 CFM rated):\u003c\/strong\u003e Belt-guard-mounted aftercooler for both sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll Options Package (#AOC2D):\u003c\/strong\u003e All asterisk options bundled at 10% discount.\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 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 — 15 HP Shop Tandem Lineup\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eT15312HC1-S:\u003c\/strong\u003e 2×15 HP, 898 RPM, 110 CFM \/ 90.6 CFM @ 175 PSI, 120-gal — $6,675\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT15312HC2-S:\u003c\/strong\u003e 2×15 HP, 795 RPM, 123.4 CFM \/ 100.4 CFM @ 175 PSI, 120-gal — $7,639 (this unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT15324HC1-S:\u003c\/strong\u003e 2×15 HP, 898 RPM, 110 CFM \/ 90.6 CFM @ 175 PSI, 240-gal — $8,121\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT15324HC2-S:\u003c\/strong\u003e 2×15 HP, 795 RPM, 123.4 CFM \/ 100.4 CFM @ 175 PSI, 240-gal — $9,173\u003c\/li\u003e\n\u003c\/ul\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 HC1:\u003c\/strong\u003e If your demand peaks are short and there is recovery time between bursts, the HC1 at $6,675 does the job. The HC2 is worth the extra $964 when the compressor is running most of the day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis unit is right when:\u003c\/strong\u003e You have a 4–8 bay shop running simultaneously, or you are in a body shop environment where painters and prep technicians overlap. 100+ CFM at 175 PSI sustained output keeps tools performing at rated pressure across multiple drops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up to 240-gallon:\u003c\/strong\u003e If your demand spikes are intense but short — a blast room, a tire inflation station that cycles hard — the T15324HC2-S adds 120 gallons of receiver storage for $1,534 more.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up to 20 HP tandem:\u003c\/strong\u003e If you consistently need more than 100 CFM and run at or above this unit's capacity, the T20312HC2-S adds 180 CFM on the same 120-gallon tank footprint for $7,974.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications — T15312HC2-S\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e T15312HC2-S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 2 × 15 HP (30 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 795 (HC2 configuration)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 123.4 (combined, both pumps)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 100.4 (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 $7,638.70\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. When you call us about a Cast Air Shop Tandem, you get a straight answer about whether the HC1 or HC2 pump, and whether the 120 or 240-gallon tank, is right for your actual CFM demand — not a pitch to sell you the most expensive unit.\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 — before and after the sale\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Cast Air manufacturer warranty\u003c\/strong\u003e — handled directly through us\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest upgrade guidance:\u003c\/strong\u003e If this unit is more than you need, we will tell you.\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":53342603968725,"sku":"T15312HC2-S","price":7638.7,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/heavy-duty-shop-tandem-model-no-t15312hc2-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}