{"product_id":"castair-30-hp-duplex-two-stage-air-compressor-100-cfm-175-psi-120-240-gal-asme-tank","title":"Castair 30 HP Duplex Two-Stage Air Compressor – 100 CFM @ 175 PSI, 120\/240 Gal ASME Tank","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; line-height: 1.7; color: #222; max-width: 900px; margin: 0 auto;\"\u003e\n\u003ch2 style=\"font-size: 24px; font-weight: bold; color: #000;\"\u003eCastair 30 HP Duplex Two-Stage Air Compressor — 100.4 CFM @ 175 PSI, 120 \/ 240 Gal ASME Tank\u003c\/h2\u003e\n\u003cp\u003eThe Castair Duplex 30 HP is the top of the duplex line — two independent 15 HP pump-and-motor sets on a single ASME-certified horizontal tank, built for the highest air demand with redundancy you can count on. Run one pump for partial load, run both for the full 100.4 CFM at 175 PSI, or let them alternate automatically to share wear, and keep your operation running even if one pump needs service. Dual full cast iron, oil-lubricated pumps deliver up to 123.4 CFM at 0 PSI. Three-phase power only. Hand-built to order by Castair, a family-owned Minnesota manufacturer since 1991.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy It's Different:\u003c\/strong\u003e Each pump uses a V-twin cylinder design for 360-degree cooling, tapered roller bearings at both ends of the crankshaft, and stainless disc-and-spring valves rated for up to 10× the lifespan of competitor reed valves. The slow-RPM, large bore\/stroke design keeps this high-output unit running cooler and quieter for extended pump life under continuous duty. A centrifugal unloader gives load-less startups, four-ring pistons minimize oil carry-over, and an oil sight glass makes maintenance checks effortless. Magnetic starter ships mounted and wired.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e Large manufacturing plants, industrial fabrication, high-volume service facilities, and any operation running heavy banks of pneumatic tools that demand maximum continuous air with backup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Three-phase power, your choice of 120-gallon or 240-gallon ASME tank. Both configurations run at 795 RPM and deliver 123.4 CFM @ 0 PSI \/ 100.4 CFM @ 175 PSI.\u003c\/p\u003e\n\u003cp style=\"border: 1px solid #d00; padding: 10px; background: #fff8f8;\"\u003e\u003cstrong\u003e⚠️ BEFORE YOU ORDER — PLEASE READ:\u003c\/strong\u003e This is a heavy-duty, built-to-order industrial compressor. \u003cbr\u003e• \u003cstrong\u003eElectrical:\u003c\/strong\u003e three-phase only — requires a dedicated 208–230V three-phase circuit installed by a licensed electrician with proper grounding. Magnetic starter comes mounted and wired. \u003cbr\u003e• \u003cstrong\u003eLead time:\u003c\/strong\u003e all Castair units are built to order — confirm current production lead time before purchase. \u003cbr\u003e• \u003cstrong\u003eWeight \u0026amp; placement:\u003c\/strong\u003e 2,005–2,355 lb depending on configuration; requires a level floor rated for the load, adequate ventilation for heat dissipation, and freight handling for delivery. \u003cbr\u003eIt is the customer's responsibility to verify electrical service, floor space, and ventilation before purchase and installation.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuplex design — two independent 15 HP pump\/motor sets\u003c\/strong\u003e run one, both, or auto-alternating for redundancy\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eUp to 123.4 CFM @ 0 PSI \/ 100.4 CFM @ 175 PSI\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTwo-stage, dual full cast iron oil-lubricated pumps\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eV-twin cylinder design\u003c\/strong\u003e for 360° cooling and longevity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings\u003c\/strong\u003e at both ends of the crankshaft for reduced friction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless disc \u0026amp; spring valves\u003c\/strong\u003e — up to 10× the lifespan of reed valves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-ring pistons\u003c\/strong\u003e for higher efficiency and minimal oil carry-over\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader\u003c\/strong\u003e for load-less startups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME-certified, powder-coated horizontal tank\u003c\/strong\u003e for safety and corrosion resistance\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eRigid metal belt guards, copper discharge \u0026amp; unloader tubes, oil sight glass\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnetic starter mounted \u0026amp; wired\u003c\/strong\u003e standard\u003c\/li\u003e\n\u003cli\u003eThree-phase  |  120 or 240 gal tank  |  Built to order in Minnesota\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"background-color: #000; color: #fff; text-align: left; padding: 10px; font-size: 15px;\" colspan=\"6\"\u003eCastair Duplex 30 HP (2×15 HP) — 123.4 CFM @ 0 PSI \/ 100.4 CFM @ 175 PSI\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003ePhase\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003ePump RPM\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003eTank (Gal)\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003eL × W × H (in)\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003eWeight (lb)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eD15312HC3-S\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eThree\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e795\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e120\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e94 × 28 × 62\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2,005\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eD15324HC3-S\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eThree\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e795\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e240\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e94 × 30 × 68\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2,355\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"background-color: #000; color: #fff; text-align: left; padding: 10px; font-size: 15px;\" colspan=\"2\"\u003eShared Specifications\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 40%; padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCastair (Spicer, Minnesota — family-owned since 1991)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eTwo-stage electric duplex air compressor (horizontal tank)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eTotal HP\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e30 HP (2 × 15 HP)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eOutput\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e123.4 CFM @ 0 PSI  |  100.4 CFM @ 175 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003ePump\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eTwo-stage, dual full cast iron, oil-lubricated, V-twin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eVoltage\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e208–230V, three-phase only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eTank\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e120 or 240 gal, ASME-certified, powder-coated horizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eControls\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eMagnetic starter mounted \u0026amp; wired; centrifugal unloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCastair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDual two-stage cast iron pumps and dual motors on one ASME horizontal tank\u003c\/li\u003e\n\u003cli\u003eMagnetic motor starter — mounted and wired\u003c\/li\u003e\n\u003cli\u003eIntake filter \/ noise silencers\u003c\/li\u003e\n\u003cli\u003eMetal belt guards, copper discharge \u0026amp; unloader tubing, oil sight glass\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003e(Factory-mounted options available — low oil control, hour meter, alternator, electronic auto drain, dual control, intake silencers, belt tensioner, aftercooler. Contact us to configure.)\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManuals \u0026amp; Documentation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"#\"\u003eCastair Duplex Series Installation \u0026amp; Operation Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#\"\u003eCastair Duplex 30 HP Spec Sheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"CastAir","offers":[{"title":"Three-phase \/ D15312HC3-S","offer_id":45134873297011,"sku":"D15312HC3-S-DUPLEX-5HP-CA","price":22382.0,"currency_code":"USD","in_stock":true},{"title":"Three-phase \/ D15324HC3-S","offer_id":45134873329779,"sku":"D15324HC3-S-DUPLEX-5HP-CA","price":24754.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/3650\/5203\/files\/duplex-picture-1024x768.webp?v=1782401675","url":"https:\/\/bluecollarplanet.com\/products\/castair-30-hp-duplex-two-stage-air-compressor-100-cfm-175-psi-120-240-gal-asme-tank","provider":"Blue Collar Planet","version":"1.0","type":"link"}