BelAire 3312D4 Air Compressor – 12HP Duplex

BelAire 3312D4 10HP 120-Gallon Duplex Air Compressor (460V 3-Phase)

The BelAire 3312D4 Air Compressor is a premium industrial duplex system engineered for facilities that require high-output reliability and built-in redundancy. By utilizing two 5HP high-efficiency motors paired with rugged two-stage cast iron pumps, this unit delivers a combined 10HP of power on a 120-gallon horizontal ASME tank. Specifically wound for 460-volt 3-phase electrical service, the 3312D4 is the ideal solution for large-scale manufacturing plants and automotive centers with high-voltage industrial grids.

The primary advantage of the 3312D4 is its duplex architecture. Instead of relying on a single large pump, the workload is distributed across two independent 5HP units. This configuration allows for alternating operation via a lead/lag control system, ensuring that both pumps receive equal wear and operate at lower temperatures. For mission-critical shops, this means your facility stays operational at 50% capacity even if one pump requires routine maintenance, eliminating the risk of a total production shutdown.

Built with 100% solid cast iron cylinders, the BelAire Iron Series is designed for 100% continuous duty. The low-RPM pump design minimizes vibration and heat buildup, which is essential for protecting internal valves and maintaining high air quality over long shifts. Each unit comes standard with dual pre-wired magnetic starters, providing superior motor protection and simplified installation for your electrical team.

BelAire 3312D4 Technical Performance Breakdown

• Horsepower: Dual 5.0 HP motors providing 10 HP total system power.
• Air Delivery: High-efficiency output of 31.4 CFM at 100 PSI and 28.5 CFM at 175 PSI.
• Electrical: Specifically wound for 460V 3-Phase industrial service.
• Tank Capacity: 120-Gallon Horizontal ASME certified receiver for massive reserves.
• Pump Material: 100% Solid cast iron construction for maximum durability.
• Start Protection: Includes dual pre-wired premium magnetic starters.
• Valving: High-flow concentric ring valves for superior volumetric efficiency.
• Redundancy: Automatic lead/lag control for fail-safe industrial operation.

To be honest, our technical crew at MulDepot.com considers the 3312D4 the “gold standard” for shops with 460V power. The efficiency of high-voltage operation combined with the redundancy of two pumps makes this a nearly bulletproof investment. If you are comparing this duplex model against a simplex 10HP unit, we suggest browsing our industrial air compressors section to see why the duplex configuration is the preferred choice for zero-downtime environments.

Advanced Engineering for Long-Term ROI

The BelAire 3312D4 is engineered to provide professional-grade performance with minimal maintenance intervention. The balanced flywheels and oversized crankcases ensure the unit runs smoothly and stays cool under heavy loads. This level of reliability is why our full-service industrial equipment catalog frequently recommends the BelAire Iron Series for fabrication shops and textile plants that prioritize equipment longevity and low total cost of ownership.

• Ductile Iron Crankshaft: Built to handle the high-torque cycles of industrial use.
• Finned Intercoolers: Dissipates heat effectively before air enters the 120-gallon receiver.
• Tapered Roller Bearings: Engineered for high axial and radial load capacity.
• Accessible Service Points: Simplifies oil changes and filter replacements for shop staff.

Ideal High-Demand Applications

• Industrial manufacturing plants with dedicated 460V 3-phase power.
• Automotive service centers running multiple high-demand impact tools and spray booths.
• Metal fabrication shops utilizing pneumatic grinders and sanders 24/7.
• Commercial woodworking facilities requiring consistent air pressure for finishing lines.

The BelAire 3312D4 offers a strategic combination of high-voltage efficiency and redundant power. With its heavy-duty cast iron construction and intelligent duplex design, it is built to be the backbone of your shop for decades. Contact us today for freight shipping details and specialized electrical guidance for this 10HP industrial powerhouse.