ABAC AS-30503BM 30 HP Rotary Screw Air Compressor - Base Mount, 150 PSI, 103.1 CFM, 70 dBA

The ABAC AS-30503BM is a 30 HP rotary screw air compressor for plants that have outgrown what a reciprocating machine can hold through a full shift. It delivers 103.1 CFM at 150 PSI and runs at 70 dBA. This is the base mount version, so it ships without a tank and plumbs into an air receiver you already own or one sized to your demand. The package is 759 lbs in a 44 x 31 x 49 in footprint, a little over three feet of wall for the largest machine in the AS-B range. Power is 208-230-460V three-phase.

Key specifications

• Model: AS-30503BM (part number 4152028460)
• Motor: 30 HP, energy-saving
• Air delivery: 103.1 CFM
• Working pressure: 150 PSI
• Noise level: 70 dBA
• Mounting: base mount, no tank
• Power supply: 208-230-460V / 3-phase / 60 Hz
• Weight: 759 lbs
• Dimensions: 44 x 31 x 49 in
• Fully integrated aluminum block air end with vertical oil separation
• Brand: ABAC, part of the Atlas Copco group

What is inside

ABAC builds the AS-B range around a fully integrated aluminum block and an air end designed to limit air loss, which is where a screw compressor either earns or wastes the power it draws. The vertical oil separation system is the other half of that: ABAC rates the design at up to 10 percent lower carbon footprint than the layout it replaced, and it is also what keeps carryover down so the oil stays in the machine rather than in your air lines. Noise and vibration were engineered down at the same time, which is how a 30 HP machine lands at 70 dBA instead of the mid 80s a comparable reciprocating unit would hold all shift.

How it compares

This is the 150 PSI build of the 30 HP machine. On pressure, the AS-30253BM is the same compressor set for 125 PSI and delivers 114.1 CFM, so the 150 PSI build costs you 11 CFM of real capacity. Take this one when a tool, press, or process at the far end of the system genuinely needs 150 PSI at the point of use, and take the 125 PSI build when volume matters more than ceiling. On size, the 25 HP AS-25503BM delivers 92.2 CFM at the same 150 PSI and 69 dBA for 723 lbs, so the step up to 30 HP buys roughly 11 CFM.

On configuration, base mount is the starting point for a modular system. The AS-30503BMD is the same compressor with an integrated dryer on the skid at 867 lbs, and the AS-30503TMD puts compressor, receiver and dryer on one tank-mounted package at 1365 lbs. Choose base mount when you already have a receiver, when you want the dryer sized independently, or when the mechanical room makes a tall tank-mounted unit awkward to place.

Typical applications

Production and fabrication plants, automotive and fleet service facilities, tire and truck shops, woodworking and finishing operations, and any site running multiple air stations at once. A rotary screw is designed for continuous duty, so it holds a steady line pressure across a full shift instead of recovering between jobs. At 150 PSI that matters most where line loss across a long run of pipe would otherwise drop a 125 PSI system below what the tool at the end of it needs.

Sizing the rest of the system

Base mount means the receiver is yours to specify. A common rule of thumb is roughly 4 gallons of storage per CFM for intermittent demand, so a 30 HP machine at 103.1 CFM typically sits behind a 400 to 500 gallon receiver, less if the load is steady. Size the receiver and the piping for the higher working pressure, and if your air reaches paint, instruments, pneumatic controls or anything that corrodes, put a refrigerated air dryer downstream rated to at least the compressor's full output, with a filter and regulator ahead of the point of use. Oil, oil filter and separator element are the service items to keep on the shelf.

Part of the ABAC AS-B screw range from the Atlas Copco group, and the largest unit in that range. See the rest of our rotary screw air compressors and the full fixed speed rotary screw line.