Schulz SRP 4030E Dynamic: 117 CFM of continuous air, on the footprint of the tank it sits on

Most shops that outgrow a piston compressor discover the same thing: the machine they need does not fit where the old one stood. The SRP 4030E is built to avoid that. It is a 2-In-1 package — the rotary air end, the motor and the ASME-stamped receiver are assembled as a single tank-mounted unit, so the entire compressor room is one skid rather than a compressor, a separate receiver and the pipework between them.

What that skid delivers is 117 CFM at 125 PSI, all day, at a 100% duty cycle. This is the largest air end in the 120-gallon family and it is wired here for a 460V, 3-phase supply.

What the 2-In-1 layout saves you

The saving is not only floor area, although a tank-mounted machine occupying the space of a receiver alone is the visible part. The less obvious saving is installation. A separate compressor and receiver must be positioned, levelled, plumbed together and isolated for vibration — every step somebody's labour and somebody's opportunity to get it wrong. Here those decisions are already made.

The receiver is 120 gallons and horizontal, the orientation that keeps the machine low and stable rather than tall in a bay with a lift working next to it. Storage volume is what stops a compressor short-cycling when demand arrives in bursts: the tank buffers the peaks instead of the motor absorbing them.

Why the duty cycle is the number that actually matters

Compressor shopping usually turns into a CFM comparison, and CFM alone is misleading. A reciprocating compressor rated on paper for a strong output is generally rated at a duty cycle well under half — it is designed to run, stop and cool. Ask it to run continuously and it gets hot, its oil degrades, and it fails early.

This is a rotary screw at 100% duty cycle, which means continuous running is the design condition rather than an abuse of it. If your shop runs several air tools at once, a sandblast cabinet, a paint booth or a plasma cutter, the demand is not intermittent and the machine has to be built for it. The air end is oil-injected and belt driven: the oil seals and cools the rotors while they compress.

The 24V controller and the protection around the motor

Control runs through a 24V microprocessor controller, with operating parameters adjustable from the panel and a constant readout of what the machine is doing. Two practical consequences: you can set the machine up for how your shop actually uses air rather than accepting a fixed factory behaviour, and when something is wrong the panel tells you which condition tripped instead of leaving you to work backwards from a compressor that will not start.

The starters are automatic and include phase and sequence failure detection — genuinely valuable protection, because a lost phase or a reversed rotation is not obvious by ear and both are destructive. Detecting the fault and refusing to start is far cheaper than the alternative.

Will It Fit?

The package measures 58.5 in long by 30.3 in wide and 39.8 in high, and weighs 1187 lbs. That weight on a modest footprint means you want it sitting on sound, level concrete rather than on a patched floor or a suspended slab — check what is under it before delivery day. Air leaves through a 1-inch tank outlet, so plan your shop main to match rather than necking it down at the machine and throwing away the pressure you just paid to make.

Electrically this version requires a 460V, 3-phase supply. Our specification data gives the amp draw and the recommended breaker as items to confirm with a certified electrician rather than fixed figures, and we agree with that: the correct feeder and overcurrent protection depend on your run length and local code. Confirming the incoming supply, the disconnect, the breaker and the conductor sizing is the customer's responsibility, and it needs a licensed electrician. The cabinet is stated to operate in ambient temperatures up to 113 °F, but a compressor room still needs ventilation — a machine making heat in a sealed cupboard will find that ceiling quickly.

A discrepancy in our data you should know about

The manufacturer's own overview for this unit specifies a 30 HP TEFC IP55 electric motor, and that figure appears in the product title and the model designation. However, one of the specification fields on our record carries a lower horsepower figure for the same machine. We cannot reconcile the two from the data we hold, so we are telling you rather than quietly choosing one.

In practice this matters for one thing above all: electrical design. If you are sizing a feeder, a breaker or a transformer on the strength of the motor rating, confirm it with us in writing before your electrician orders material. We will check it against the manufacturer specification sheet. Everything else on this page — the air end output, the receiver, the controller, the dimensions — is consistent across our sources.

Perfect For

• Busy multi-bay service shops running several air tools simultaneously, where the compressor never really gets a rest.
• Body shops and paint operations where continuous, steady air is the requirement rather than short bursts.
• Fabrication and production work — plasma, blasting and continuous-demand tooling.
• Shops with a 460V service that want the largest air end in this family without a separate receiver installation.

What Is in the Box

This ships as the complete 2-In-1 unit: rotary air end and motor mounted on the 120-gallon horizontal receiver, with the magnetic starter, the 24V controller, an oil sight glass and an aftercooler all fitted as standard. Our specification record is explicit about two things that are not included, and they are the two most commonly assumed: there is no air dryer and no electronic drain valve on this configuration. If you are spraying, running air tools with tight tolerances, or working in a humid climate, budget for a dryer as a separate item.

Specifications

Certification, stated plainly

The receiver on this machine carries an ASME stamp, and that is worth understanding precisely. It is a pressure-vessel certification: it says the tank was designed, built and inspected to the pressure vessel code, which is exactly what you want on a vessel holding 125 PSI in an occupied building, and it is what many jurisdictions and insurers ask about first. It is not a whole-machine electrical safety listing, and our data claims no such listing for the package. If your insurer, your local inspector or your own safety policy requires an equipment listing covering the electrical assembly rather than the vessel, confirm that requirement and check it with us before you buy rather than after installation.

Shipping, delivery and pickup

This is a freight shipment to the lower 48 states, quoted live at checkout so the price reflects your actual lane on the day. At this weight you need a plan for getting it off the truck: a forklift with the reach for the skid, or arrange to collect from the carrier terminal, which many buyers find simpler for a single machine. Residential delivery is available and carries a residential fee, shown at checkout before you pay. We also have pickup available for Schulz equipment in Acworth, GA if collecting suits you better. Whichever route you take, inspect the machine before the driver leaves and write any damage on the delivery paperwork before you sign — a clean signature is very hard to walk back. Call, text or chat with us if you have questions: 866-774-7743.

Warranty

Our record lists a 1-year warranty for this unit, applying to both consumer and commercial use. Keep your commissioning records, because the two things most likely to complicate a claim on a rotary screw are an installation that was never signed off and a maintenance history nobody wrote down. If a fault develops, contact us before anything is opened — a machine that has been taken apart is a claim that gets argued about instead of paid.