How Inappropriate Uses of Compressed Air Drive Up Plant Energy Costs
An open blowoff tube can look insignificant beside a production machine. But if it runs through two shifts, during breaks, and between parts, the compressor keeps supplying air that may be doing little useful work. Repeat that arrangement across a plant, and unnecessary demand can keep another compressor online.
That’s how inappropriate uses of compressed air drive up plant energy costs: high-pressure, treated air performs jobs that need less pressure, intermittent flow, or no compressed air at all. Reducing that demand starts at the application, but the savings depend on how the compressor controls respond.
Why a Small Air Use Can Create a Larger Energy Burden
Compressed air carries the cost of compression, treatment, and distribution. Using plant air to sweep a floor or cool an electrical cabinet draws on that entire system, even though a lower-energy method may do the job.
The penalty grows when a wasteful application contributes to low pressure elsewhere. Maintenance raises the compressor discharge pressure to keep a distant machine running. That increases compression work and can increase flow through unregulated openings and leaks. This extra consumption caused by higher pressure is often called artificial demand.
Removing unnecessary flow doesn’t automatically produce a matching reduction in electrical demand. An unloaded rotary screw compressor still consumes power. A poorly coordinated multiple-compressor system may continue running too many machines after demand falls. Demand reduction and compressor control changes need to work together.
Common Inappropriate Uses—and What to Evaluate Instead
Compressed air isn’t inappropriate simply because an alternative exists. The question is whether its pressure, cleanliness, speed, and controllability are needed for the task.
Continuous Blowoff Between Production Cycles
Open tubes used for chip removal, part drying, or product separation often run whenever the machine’s air supply is on. If parts arrive intermittently, much of that flow serves no purpose.
Use a sensor or machine signal to activate air only when a part is present.
Evaluate engineered nozzles rather than unrestricted tubing.
Set point-of-use pressure to the lowest level that produces acceptable results.
Consider a blower-fed air knife for sustained, high-volume, low-pressure work.
Validate drying, chip removal, surface finish, and cycle time before standardizing a change. A nozzle that uses less air but causes rejects isn’t an improvement.
Cooling Cabinets, Motors, or Operators
A cracked-open air line aimed at a hot motor or electrical enclosure is usually a workaround, not a complete cooling solution. It can hide blocked ventilation, excessive ambient heat, or an equipment fault.
Evaluate the heat load and enclosure requirements before selecting filtered ventilation, a heat exchanger, or enclosure air conditioning. Compressed-air cabinet coolers can be appropriate in some harsh environments, but their air consumption and controls belong in the operating-cost comparison. Thermostatic operation is generally preferable to continuous flow where the application permits it.
Floor Cleaning and General Housekeeping
Blowing debris across a shop consumes air without collecting the material. It can also spread dust and send chips toward nearby workers or equipment. Suitable industrial vacuums and mechanical cleaning methods often provide a better result.
Cleaning with compressed air is also a safety issue. Applicable OSHA requirements include pressure reduction below 30 psi, effective chip guarding, and personal protective equipment. A regulator setting alone doesn’t establish compliance; blocked-nozzle conditions matter. Never use compressed air to clean clothing or skin, and use dust-specific equipment where combustible dust is present.
Vacuum Generation and Air-Operated Pumps
Venturi vacuum generators are useful for fast, localized pick-and-place operations. They become expensive when supplied continuously despite needing vacuum only briefly. Evaluate vacuum switches, automatic shutoff, suitable vacuum retention arrangements, or a central or electric vacuum source.
Air-operated diaphragm pumps may be justified by fluid compatibility, hazardous-location requirements, or operating conditions. Still, unnecessary cycling and extended idle operation deserve attention. Compare alternatives against the actual process rather than replacing pneumatic equipment indiscriminately.
Open Drains and Unneeded Off-Shift Air
A manual condensate drain left cracked open creates continuous air loss. A timed drain can also discharge useful air after the liquid has cleared. Properly selected demand-operated condensate drains can reduce this loss, provided they’re maintained and checked for blockage.
Similarly, idle machines may consume air through purge circuits, nozzles, and internal leakage. Isolate equipment during shutdowns only after confirming that air isn’t needed for safe positioning, instruments, or protective functions.
Don’t confuse avoidable consumption with required air treatment. Desiccant dryer purge may be part of the drying process; reducing it without checking dryer design and dew point requirements can compromise air quality.
Find the Waste Without Disrupting Production
Start with a walk-through during production, breaks, and a planned idle period. Listen for continuous flow, but don’t rely on sound alone. A quiet application can still consume substantial air.
For each questionable use, document:
Purpose: What production or safety function does the air perform?
Flow and pressure: What does it consume at its actual operating pressure?
Operating time: Does flow stop between cycles, during breaks, and overnight?
Quality requirements: Does the task require clean, dry air or product-contact precautions?
Acceptance criteria: How will the team verify that a change hasn’t harmed production?
Use measured flow where practical. Manufacturer nozzle data can support an estimate when supply pressure and configuration match the published conditions. Don’t guess consumption from hose diameter alone.
Make controlled changes to one application or area at a time. Involve operators, maintenance, engineering, and safety personnel. Changes to machine air circuits must account for stored energy, machine safety functions, and lockout/tagout procedures.
Turn Reduced Air Demand Into Measurable Electrical Savings
Log compressor package power, operating states, and system pressure before and after changes over comparable production periods. Flow measurements help separate improved efficiency from simply making fewer parts.
Control type affects the result:
Load/unload: Less demand may increase unloaded time without eliminating unloaded power consumption.
Variable-speed: Power can fall as demand falls within the compressor’s operating range, but minimum-speed limits still matter.
Multiple compressors: Sequencing may need adjustment so reduced demand allows one machine to stop rather than leaving several lightly loaded.
Receiver capacity and allowable pressure bands also affect cycling. An air receiver tank can help manage short demand events, but it won’t correct continuous waste.
Annual energy savings = verified average kW reduction × annual hours represented by that reduction. Multiply the resulting kWh by the applicable electricity rate for an energy-cost estimate. Evaluate demand charges separately; they depend on whether the change reduces the facility’s billed peak.
For a proposed nozzle, blower, or vacuum conversion, include the replacement equipment’s electricity use, installation, controls, maintenance, and production requirements. Avoid treating every CFM removed as having a fixed dollar value regardless of compressor operation.
A Tennessee Plant Scenario: Low Pressure Without a Capacity Shortage
Consider a hypothetical West Tennessee manufacturer that adds a packaging line with continuous blowoff. During overlapping production cycles, existing equipment farther down the header begins reporting low pressure. The initial proposal is a larger compressor.
Before purchasing equipment, compare pressure at the compressor room and affected machines while logging demand. Check restrictions across filters, dryers, and piping. Then determine whether the new blowoff needs continuous plant air or could use timed nozzles or a blower.
If unnecessary demand and distribution losses explain the symptoms, adding compressor capacity may leave the underlying problem intact. If verified production demand still exceeds available supply after corrections, expansion becomes a better-supported purchasing decision.
Bottom Line
Start with air uses that run continuously, operate above their required pressure, or continue when production stops. Replace, control, or isolate them only after confirming the process and safety requirements. Then verify that compressor power actually falls.
Before requesting equipment quotes, gather operating schedules, compressor control information, pressure readings, and application flow estimates. Gordon Air Compressor can help Tennessee facilities evaluate those findings and compare demand-side improvements with equipment or control changes.
If unexplained air demand is pushing up your electric bill, contact Gordon Air Compressor to discuss a system evaluation.
Gordon Air Compressor
706 Scott Street
Memphis, TN 38112
Sales and Service: 901-327-1327
Emergency Service: 901-482-5925
