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120-Gallon Air Compressors

120-gallon air compressors hold a large air reserve for high-demand shops running several tools at once. Two-stage simplex and duplex models, 5 to 15 HP, up to 175 PSI, in single-phase and three-phase.

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120-Gallon Air Compressors for High-Demand Shops

A Bigger Reserve Means Fewer Motor Cycles

A 120-gallon tank stores more compressed air than an 80-gallon unit, so the motor cycles less often and the pump keeps up when several tools draw at once. That reserve is what separates a busy multi-bay service floor from a single-operator shop: when three techs hit impact wrenches at the same time, the larger tank holds pressure while the pump catches up. Every model here is two-stage with a cast-iron pump rated to 175 PSI for continuous-duty work.

Simplex or Duplex Output

Simplex 120-gallon models run one pump and motor and cover 10 to 15 HP demand. Duplex models put two pumps and motors on the single 120-gallon tank, which doubles output for a high-demand floor and provides redundancy: if one head goes down for service, the other keeps the shop running. Duplex units with magnetic starters add auto-alternating lead and lag control so the two motors share wear evenly. For pressurized-system safety, review the OSHA compressed-gas equipment guidance.

Power and Placement

These are three-phase-friendly units; 10 HP models come in single or three-phase, and 15 HP is three-phase only. All are horizontal for a low, stable footprint and ship by freight at roughly 830 to 1,760 pounds, so plan for a dock or liftgate. Related: Air Compressors · Electric Air Compressors · 80-Gallon Air Compressors. For a high-output floor, the AED-46315 15 HP duplex compressor delivers 93 CFM at 175 PSI.

Frequently Asked Questions

How much space does a 120-gallon air compressor cover?
Tank size is about reserve capacity, not coverage. A 120-gallon unit stores enough air to run multiple tools at once without the motor short-cycling, which suits a multi-bay shop or busy service floor.
What is a duplex 120-gallon compressor?
A duplex unit mounts two separate pump-and-motor assemblies on one 120-gallon tank. They alternate or run together for higher output and redundancy, so the shop keeps running if one head needs service.
What horsepower comes on a 120-gallon compressor?
Mi-T-M 120-gallon models run 10 HP simplex, 15 HP simplex, and 5 to 15 HP duplex configurations. Higher horsepower delivers more CFM for heavier or simultaneous tool use.
Does a 120-gallon compressor need three-phase power?
Some do. The 10 HP models come in single-phase or three-phase; 15 HP models are three-phase only. Confirm your building has the right service before ordering.

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