{"product_id":"castair-d5312hc2-s-1","title":"Castair D5312HC2-S","description":"\u003cp\u003eThe Castair D5312HC2-S is a 10 HP total (2x5 HP) two-stage duplex air compressor running on 3-phase power with a 120-gallon ASME horizontal tank. This is the 3-phase equivalent of the D5112HC2-S — same pumps, same CFM, same tank, different electrical: 3-phase motors run more efficiently, draw less current per phase at equivalent output, and are the right choice for any shop that has 3-phase service available.\u003c\/p\u003e\n\n\u003cp\u003eOutput is 35 CFM at 175 PSI (44 CFM at 0 PSI). The C2 pump configuration runs at 420 RPM. C2 at 420 RPM is the slow-speed configuration — cooler running, quieter, and longer service life in continuous-duty applications. Both configurations deliver the same CFM output; the difference is operating speed, noise level, and service longevity.\u003c\/p\u003e\n\n\u003cp\u003eDuplex configuration means two independent pump-motor assemblies on one tank. If one pump needs service, the other carries the shop. Magnetic starter is factory mounted and wired — this ships ready to connect to your electrical service.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\n\u003ch3\u003ePump Construction — C2 Configuration\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAll Cast Iron Construction:\u003c\/strong\u003e Cast iron cylinders, heads, and crankcase throughout\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eC2 Pump at 420 RPM:\u003c\/strong\u003e Slow-speed C2 pump — cooler, quieter, longer life in high duty-cycle applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTapered Roller Bearings:\u003c\/strong\u003e Both crankshaft ends — better load support than ball bearings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Steel Connecting Rods:\u003c\/strong\u003e Automotive-type insert bearings at crankshaft and wrist pin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisc and Spring Valves:\u003c\/strong\u003e Higher efficiency, easier service than reed valves\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Ring Pistons:\u003c\/strong\u003e Better sealing and reduced oil carry-over\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCentrifugal Unloader:\u003c\/strong\u003e Loadless start every time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTwo-Stage Compression\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo-Stage Design:\u003c\/strong\u003e To 175 PSI in two stages — more efficient and cooler than single-stage at this pressure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e44 CFM @ 0 PSI \/ 35 CFM @ 175 PSI:\u003c\/strong\u003e Consistent output\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTank, Controls, and Electrical\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e120-gallon ASME Horizontal Tank:\u003c\/strong\u003e Powder-coated steel with channel base; ASME certified\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions (L x W x H):\u003c\/strong\u003e 85\" x 28\" x 57\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3-Phase Electrical:\u003c\/strong\u003e More efficient motor operation than single-phase at equivalent HP; lower per-phase current draw; standard for industrial shop installations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMagnetic Starter — Mounted and Wired:\u003c\/strong\u003e Factory-installed; handles 3-phase motor switching with overload protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eASME Safety Valves:\u003c\/strong\u003e Factory installed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMetal Belt Guard — Totally Enclosed:\u003c\/strong\u003e OSHA-compliant\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavy Duty 1725 RPM Industrial Motors:\u003c\/strong\u003e Full 15% service factor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDuplex Redundancy\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo Independent Pump-Motor Assemblies:\u003c\/strong\u003e Service one while the other runs\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eNo Production Downtime for Routine Maintenance\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCastair D5312HC2-S duplex compressor (two 5 HP pump-motor assemblies, 120-gallon ASME tank, skid)\u003c\/li\u003e\n  \u003cli\u003eMagnetic starter — factory mounted and wired\u003c\/li\u003e\n  \u003cli\u003eASME safety valves (factory installed)\u003c\/li\u003e\n  \u003cli\u003ePressure gauges and controls\u003c\/li\u003e\n  \u003cli\u003eBelt guards (factory installed)\u003c\/li\u003e\n  \u003cli\u003eOwner's manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eShips on freight. Weight 1,270 lbs shipped — confirm delivery access and unloading equipment.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eAvailable Factory-Mounted Options\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eLow Oil Control (#6304x2M)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eHour Meters (#HRM75x2M for 230V \/ #HRM460x2M for 460V)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlternator (#ALT230M \/ #ALT460M):\u003c\/strong\u003e Rotates lead pump each cycle for even wear\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eElectronic Auto Drain (#SDV03M)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eAftercooler (#BGAC1x2M — 70 CFM rated)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eBelt Tensioner (#184Dx2M — 5 HP)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eVibration Pads (#VP1004 — set of 4)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eRight From The Start Kit (#RFS001D — 10 HP)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eAll Options C2 Package (#AOC2D)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable Configurations — 10 HP 3-Phase Duplex\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5312HC1-S — 10 HP, 3-Phase, 120 gal, 767 RPM C1 pump:\u003c\/strong\u003e Fastest pump, lower cost, 1,080 lbs shipped\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5312HC2-S — 10 HP, 3-Phase, 120 gal, 420 RPM C2 pump:\u003c\/strong\u003e Slower, quieter, longer life, 1,270 lbs shipped\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5324HC1-S — 10 HP, 3-Phase, 240 gal, 767 RPM C1 pump:\u003c\/strong\u003e More tank storage, 1,430 lbs shipped\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5324HC2-S — 10 HP, 3-Phase, 240 gal, 420 RPM C2 pump:\u003c\/strong\u003e Maximum storage and longevity, 1,620 lbs shipped\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. Stepping Up or Down?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe D5312HC2-S fits when:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eYou have 3-phase power and want the most efficient 10 HP duplex option\u003c\/li\u003e\n  \u003cli\u003eYour sustained CFM demand is in the 25–35 CFM range\u003c\/li\u003e\n  \u003cli\u003eRedundancy matters — you cannot shut down air to service the compressor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStep up when:\u003c\/strong\u003e CFM demand consistently exceeds 35 CFM — move to the 15 HP duplex (D7312\/D7324 series at 49.6 CFM) or 20 HP (D10312\/D10324 at 70 CFM).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConsider single-phase versions (D5112\/D5124) only if:\u003c\/strong\u003e 3-phase is not available at your location.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e D5312HC2-S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Duplex Series\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHorsepower (each \/ total):\u003c\/strong\u003e 2x5 HP \/ 10 HP total\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical:\u003c\/strong\u003e 3-Phase\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump Configuration:\u003c\/strong\u003e C2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 420\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 44\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 35\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Pressure:\u003c\/strong\u003e 175 PSI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Capacity:\u003c\/strong\u003e 120 gallons\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Style:\u003c\/strong\u003e ASME horizontal with channel base\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions (L x W x H):\u003c\/strong\u003e 85\" x 28\" x 57\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShipped Weight:\u003c\/strong\u003e 1,270 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMagnetic Starter:\u003c\/strong\u003e Included, factory mounted and wired\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eWe have specialized in professional-grade shop compressors since 2016. Choosing between C1 and C2 pumps, 120 and 240 gallon tanks, or single-phase and 3-phase configurations is not guesswork — it depends on your actual CFM demand, electrical service, duty cycle, and budget. Call us and we will work through it with you before you order a freight shipment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree Shipping\u003c\/strong\u003e on qualifying orders (freight; site access confirmation required)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree Technical Support\u003c\/strong\u003e — 866-217-0063\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull Manufacturer Warranty\u003c\/strong\u003e — Castair backs their duplex systems\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eHonest Configuration Guidance\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\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":53342540792021,"sku":"D5312HC2-S","price":17518.54,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-d5312hc2-s-1","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}