ABAC AS-7.5251TMD 7.5 HP Rotary Screw Air Compressor - 131 Gallon Tank Mount with Dryer, 125 PSI, 30.5 CFM, 67 dBA

The ABAC AS-7.5251TMD is a complete compressed air station on one base: a 7.5 HP rotary screw compressor, a 131 gallon air receiver and an integrated refrigerated dryer, mounted and plumbed together at the factory. It delivers 30.5 CFM at 125 PSI and runs at 67 dBA, quiet enough to sit in the work area rather than in a separate compressor room. There is no tank and no dryer to size, site and pipe, so installation comes down to setting it in place, wiring it and connecting the air line. Choose 230V single-phase (AS-7.5251TMD) or 208-230-460V three-phase (AS-7.5253TMD).

Key specifications

• Models: AS-7.5251TMD (part number 4152044129) and AS-7.5253TMD (part number 4152043903)
• Motor: 7.5 HP, energy efficient
• Air delivery: 30.5 CFM
• Working pressure: 125 PSI
• Noise level: 67 dBA
• Tank: 131 gallon air receiver, tank mount
• Integrated refrigerated air dryer
• Compressor, receiver and dryer on a single base
• Power supply: 230/1/60 or 208-230-460/3/60
• Dimensions: 76 x 24 x 63 in
• Weight: 741 lbs
• Fully integrated aluminum block air end with vertical oil separation technology
• Digital controller with menu driven operation and programmed maintenance
• Brand: ABAC, part of the Atlas Copco group

Why a screw instead of a piston

A piston compressor builds air in bursts and needs time to cool between them. A rotary screw runs, which is why shops that use air most of the day move to one. There is no duty cycle to watch, line pressure stays flat through a shift instead of sagging and recovering, and at 67 dBA the machine sits well below a comparable reciprocating unit. The trade is that a screw dislikes short cycling, so it wants a receiver sized to its output and a demand pattern that keeps it loaded rather than starting and stopping all day. On this build the 131 gallon receiver is already matched to the air end, so that sizing decision is made for you.

What the integrated dryer buys you

Air leaving any compressor is warm and saturated. As it cools in the piping that moisture drops out as liquid water, and it ends up in the tool, the finish, the cylinder or the control valve at the far end of the run. A refrigerated dryer chills the air at the compressor so the water condenses and drains there instead of travelling down the line. Buying it integrated rather than as a separate box means one electrical connection, one footprint, no interconnecting pipework to get wrong, and a dryer already matched to this compressor's output rather than guessed at. For paint and finishing work, pneumatic controls, plasma tables and tire service, drying at the source is the difference between a system that works and one that is always being chased with traps and filters.

How it compares

Within the AS-B 7.5 HP range the differences come down to storage, air treatment and pressure. The 71 gallon tank mount with dryer is the same compressor and dryer on a smaller receiver at 593 lbs and a 60 in long footprint, which suits a shop that is tight on floor space and draws air steadily rather than in bursts. The 131 gallon tank mount without a dryer is the choice if you already have air treatment downstream. The 150 PSI build trades airflow for pressure at 27.1 CFM. If you are replacing a compressor on an existing system and keeping the receiver and piping already in place, the base mount build is the one to buy at 360 lbs. If the shop is already running short of air, the 10 HP AS-10253TMD steps the same package up to 36.4 CFM.

Typical applications

Automotive and fleet service bays, tire shops, cabinet and woodworking shops, paint and finishing work, and small production floors where moisture in the air line causes rejects or shortens tool life. Drying the air at the compressor keeps condensate out of the distribution piping instead of leaving it for traps and filters downstream to catch. The 131 gallon receiver stores noticeably more air than the 71 gallon build, which helps when several bays pull on impact tools at the same time.

Setting it up

Give the cabinet clear air on the cooling side, keep it out of a hot corner, and leave working room at the service panels. The unit measures 76 x 24 x 63 in and weighs 741 lbs, so plan the route in and the pad it sits on before it arrives. Run it on its own circuit sized to the motor nameplate. Oil, oil filter and separator element are the service items, and the digital controller handles menu driven operation and tracks the maintenance intervals for you. Call us with your own flow and duty cycle and we will check this machine against the demand before you pipe it in.

Part of the ABAC AS-B 5 to 20 HP screw range from the Atlas Copco group, built around a fully integrated aluminum block air end, eco friendly vertical oil separation technology and an energy efficient motor. A rotary screw is built for continuous running, so it holds a steady line pressure through a full shift instead of recovering between jobs. See the rest of our rotary screw air compressors, the fixed speed screw compressors, and our air dryers.

CFM measured per ISO 1217 Annex C at 109 PSI. Noise measured per ISO 2151:2004 using ISO 9614/2.