{"product_id":"castair-10hp-2x5-duplex-duplex-air-compressor-240gal-d5124hc1","title":"Castair 10HP (2x5) Duplex Duplex Air Compressor 240Gal - D5124HC1","description":"\u003cp\u003eThe Castair D5124HC1 is a 10 HP total (2x5 HP) two-stage duplex air compressor running on single-phase power with a 240-gallon ASME horizontal tank. This is a single-phase duplex — two independent pump-motor assemblies sharing one tank — which means you get 35 CFM at 175 PSI and built-in redundancy on standard single-phase electrical service. If one pump needs service, the other keeps your shop running. That is the core reason to choose a duplex over a single-unit machine.\u003c\/p\u003e\n\n\u003cp\u003eThe C1 pump configuration runs at 767 RPM (higher-speed C1 pump). Both C1 and C2 configurations deliver the same 35 CFM at 175 PSI; the difference is pump speed, noise level, and long-term service life. The C2 pump, running slower, runs cooler and quieter and will generally outlast the C1 configuration in continuous-duty applications. The C1 is lighter and slightly lower cost.\u003c\/p\u003e\n\n\u003cp\u003eCastair builds these in Spicer, Minnesota — family owned since 1991. The Duplex Series uses the same industrial pump design as their Industrial Series single-unit machines: all cast iron, tapered roller bearings, automotive-type rod bearings, and disc\/spring valves.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\n\u003ch3\u003ePump Construction — C1 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 — long service life and lower noise versus aluminum pump designs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eC1 Pump at 767 RPM:\u003c\/strong\u003e Moderate-speed configuration — balances cost and performance for typical shop duty cycles\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTapered Roller Bearings:\u003c\/strong\u003e Both ends of the crankshaft — superior load support versus ball bearings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Steel Connecting Rods:\u003c\/strong\u003e Automotive-type rod insert bearings at crankshaft and wrist pin — serviceable and built for long intervals\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisc and Spring Valves:\u003c\/strong\u003e Higher efficiency and easier service than reed valves\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Ring Pistons:\u003c\/strong\u003e Better sealing, less oil carry-over into discharge air\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCentrifugal Unloader:\u003c\/strong\u003e Loadless start every time — no fighting cylinder pressure at startup\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 Compresses to intermediate pressure, then to 175 PSI — more efficient and cooler than single-stage at this pressure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e175 PSI Maximum:\u003c\/strong\u003e Covers all standard pneumatic tool requirements; higher than single-stage units\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e44 CFM @ 0 PSI \/ 35 CFM @ 175 PSI:\u003c\/strong\u003e Consistent output across the pressure range\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\u003e240-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 30\" x 64\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eASME Safety Valves:\u003c\/strong\u003e Factory installed on both pump discharge lines\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMagnetic Starter — Mounted and Wired:\u003c\/strong\u003e Factory-installed for both 5 HP motors; includes overload protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMetal Belt Guard — Totally Enclosed:\u003c\/strong\u003e OSHA-compliant drive belt and pulley guarding\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavy Duty 1725 RPM Industrial Motors:\u003c\/strong\u003e Full 15% service factor — rated for shop duty cycles\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 Either unit can carry shop air demand while the other is serviced\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo Shutdown for Routine Maintenance:\u003c\/strong\u003e Service one pump while the other runs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCastair D5124HC1 duplex compressor (two 5 HP pump-motor assemblies, 240-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. This unit weighs 1,460 lbs — confirm delivery and unloading equipment before scheduling.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eAvailable Factory-Mounted Options\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Oil Control (#6304x2M):\u003c\/strong\u003e Pump shutdown on low oil level\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHour Meters (#HRM75x2M):\u003c\/strong\u003e Individual runtime tracking per pump\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlternator (#ALT230M):\u003c\/strong\u003e Rotates lead pump each cycle for even wear — particularly useful on C1 units where manual alternation is otherwise required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectronic Auto Drain (#SDV03M):\u003c\/strong\u003e Timed automatic tank drain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAftercooler (#BGAC1x2M — 70 CFM rated):\u003c\/strong\u003e Reduces moisture in compressed air lines\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBelt Tensioner (#184Dx2M — 5 HP):\u003c\/strong\u003e Simplifies belt maintenance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntake Noise Silencer (#SA100x2M):\u003c\/strong\u003e Additional intake noise reduction\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 C1 Package (#AOC1D)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable Configurations — 10 HP Duplex Lineup\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5124HC1 (this unit) — 10 HP, 1-Phase, 240-gallon, 767 RPM C1 pump:\u003c\/strong\u003e Current selection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5112HC1-S — 10 HP, 1-Phase, 120 gal, 767 RPM C1 pump:\u003c\/strong\u003e Smaller tank where floor space is limited\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD5324HC1-S \/ D5324HC2-S — 10 HP, 3-Phase equivalents:\u003c\/strong\u003e 3-phase versions of the same system — preferred if 3-phase is available (more efficient motors, lower electrical stress)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eD7124HC1-S \/ D7124HC2-S — 15 HP (2x7.5), 1-Phase, 240-gallon:\u003c\/strong\u003e Step up to 49.6 CFM @ 175 PSI\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 D5124HC1 fits when:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eYour shop does not have 3-phase power and needs a duplex system — this is the only way to get duplex redundancy on single-phase\u003c\/li\u003e\n  \u003cli\u003eYour sustained CFM demand is in the 25–35 CFM range\u003c\/li\u003e\n  \u003cli\u003eYou have multiple technicians but cannot justify the cost of a 15 or 20 HP system\u003c\/li\u003e\n  \u003cli\u003eDowntime is a concern — the second pump keeps you running during service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStep up to 3-phase duplex (D5312\/D5324 series) when:\u003c\/strong\u003e 3-phase power is available — 3-phase motors are more efficient and run cooler at equivalent HP, and the electrical installation is simpler at this power level.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep up to 15 HP duplex when:\u003c\/strong\u003e Your shop consistently pulls more than 35 CFM or runs equipment that needs higher sustained output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA single 10 HP compressor may be enough if:\u003c\/strong\u003e Redundancy is not a priority and your CFM demand fits a single-unit machine — the duplex adds cost and complexity that only pays off if you need the backup pump or if you cannot shut down for maintenance.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e D5124HC1\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 Single-Phase (1-Phase)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump Configuration:\u003c\/strong\u003e C1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 767\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 240 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 30\" x 64\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShipped Weight:\u003c\/strong\u003e 1,460 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. If you are deciding between C1 and C2 pump configurations, between 120 and 240 gallons, or between single-phase and three-phase — call us. We will help you figure out what actually fits your shop's electrical service and CFM demand before you commit to a freight shipment of a 1,000+ lb compressor.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree Shipping\u003c\/strong\u003e on qualifying orders (freight; site requirements must be confirmed)\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\n\u003cstrong\u003eHonest Configuration Guidance\u003c\/strong\u003e — C1 vs. C2, tank sizing, electrical requirements\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":53342539907285,"sku":"D5124HC1","price":16733.28,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-10hp-2x5-duplex-duplex-air-compressor-240gal-d5124hc1","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}