Most manufacturers rarely consider their compressed air systems unless something goes wrong. As long as the equipment runs smoothly, air pressure stays steady, and no alarms sound, it’s natural to assume everything is fine.
However, this perspective can shift quickly once the electric bill arrives.
Industrial air compressors use a lot of energy, especially in facilities that depend on compressed air across several shifts. The challenge is that a system may keep pressure steady and production running, yet still use much more electricity than needed.
There are many things that can cause operating costs to balloon, including operating pressure, inefficient controls, and equipment that no longer fits production needs. Many of these issues develop slowly, so they’re hard to notice during daily work.
An air compressor audit helps manufacturers find where energy is wasted, see how their equipment is performing, and decide which improvements will have the most impact.
What Is an Air Compressor Audit?
An air compressor audit evaluates a facility’s compressed air system, focusing on energy consumption, equipment performance, and how well the system meets production requirements.
Instead of looking at just one compressor, a full audit reviews how the whole system works. This covers compressors, dryers, filters, storage tanks, piping, controls, and all equipment that uses compressed air in the facility.
Depending on the scope, technicians may review operating pressures, airflow, compressor run times, energy consumption, system demand, and potential air leaks.
For manufacturing facilities, these measurements help answer some important questions. Is the system producing more compressed air than production actually requires? Are compressors operating efficiently during periods of lower demand? Could restrictions elsewhere in the system be forcing equipment to work harder?
It’s important to understand how these parts work together. Fixing one issue without looking at the whole system might not give you the results you expect.
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Find the Air Leaks That Are Driving Up Costs
If you take a walk through almost any manufacturing facility, it’s likely you’ll hear compressed air escaping from somewhere. Maybe it’s a little hiss near a fitting or a persistent leak around a piece of production equipment.
These sounds are easy to overlook, especially when everything else appears to be working well.
But air leaks make compressors work harder to produce air that doesn’t help production. Even small leaks can waste a lot of energy if they go on for hours, days, or weeks.
Common problem areas include:
- Worn hoses and loose fittings
- Damaged seals and connections
- Leaking valves and couplings
- Aging piping
- Equipment that continues consuming compressed air when not in use
During an audit, technicians may use ultrasonic leak detection equipment to locate leaks that are difficult to hear over the usual noise in a manufacturing plant.
Once identified, leaks can be documented and prioritized based on their severity, location, and potential impact on energy consumption.
It’s also important to look at why some leaks keep coming back. If the same equipment or connections fail repeatedly, it could mean parts are worn, there’s vibration, or there are maintenance problems that need more attention.
Fixing leaks can cut down on unnecessary compressor use, but it’s important to check system performance before and after repairs to see the results.
For facilities running compressed air systems over several shifts, setting up a regular leak detection and repair program can help stop energy losses from building up again.
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Decide Whether Your System Is Operating at the Right Pressure
The first thought you may have is that higher air pressure is better. At the end of the day, if production equipment requires a certain pressure, having a little extra might seem like a good way to err on the side of caution.
However, running at higher pressure than needed uses more energy and can lead to more air leaks and extra demand in the system.
An air compressor audit examines whether system pressure settings match the actual requirements of production equipment.
A technician may measure pressure at the compressor as well as at different points in the facility to identify where pressure drops occur.
For example, imagine a production line that occasionally experiences insufficient air pressure. Increasing the compressor’s discharge pressure might temporarily resolve the issue, but what if the real problem is a restricted filter or undersized piping?
As a result, the whole compressed air system runs at higher pressure just to fix a problem in one part of the facility.
This extra pressure raises energy use but doesn’t solve the real issue.
Filters, dryers, piping, valves, and other components should be evaluated when determining why pressure isn’t reaching equipment consistently. In some cases, replacing a restricted component or correcting a distribution problem may eliminate the need for higher compressor pressure.
The goal is to keep the pressure needed for reliable production while avoiding wasted energy.
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Evaluate How Compressors Respond to Changing Demand
Most manufacturing plants don’t use the same amount of compressed air all day long.
A production line starts up and stops while equipment will cycle on and off. Different shifts may have different operating requirements. Some facilities experience substantial changes in demand depending on the products being manufactured.
Your compressor system needs to adjust efficiently to these changes.
During an audit, technicians can evaluate how compressors load, unload, cycle, and operate when demand fluctuates.
For example, a compressor that runs unloaded for long periods still uses electricity but doesn’t produce useful compressed air. If this happens often, the facility is paying for equipment that isn’t helping production.
In plants with multiple compressors, sequencing becomes another important consideration.
When compressors aren’t coordinated properly, several machines may operate inefficiently even though the facility’s demand could be met with a different combination of equipment or control settings.
Looking at how compressors operate can show if changes to controls, sequencing, or equipment setup could make things more efficient.
Production schedules also matter. A facility operating three shifts may have very different compressed air requirements overnight than it does during peak daytime production.
Knowing about these changes helps manufacturers see if their compressors are efficient throughout the whole production schedule, not just during peak times.
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Check Whether Your Equipment Matches Your Current Production Needs
A compressed air system that was properly sized when installed might not be the best fit for the facility today.
Production may have expanded, new machinery may have been added, or certain processes may have been eliminated. The facility could now require considerably more or less compressed air than it did several years ago.
An audit helps determine whether existing compressor capacity and operating characteristics still match actual demand.
Oversized equipment can operate inefficiently when demand consistently falls below its optimal operating range. Undersized equipment may struggle to maintain adequate pressure during peak production.
Both situations can cause problems.
For example, a manufacturer that has added automated production equipment may experience increased demand during certain operating periods. Before purchasing another compressor, it’s important to determine whether the existing system has sufficient capacity and whether air storage, controls, or distribution restrictions are contributing to the problem.
Similarly, a facility that has reduced production may be operating equipment originally selected for a much higher demand.
An audit can help determine whether changes to controls, storage, piping, or equipment configuration would improve performance.
Sometimes small adjustments are enough. Other times, the results may show that a bigger equipment upgrade is needed.
In any case, decisions about air compressor equipment should rely on actual operating data, not just assumptions about what the facility needs.
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Look Beyond the Compressor Itself
It’s usually the compressor that is focused on the most; however, it’s not the only part that can drive up compressed air energy costs.
Air dryers, filters, piping, and storage tanks all influence how efficiently the system operates.
Clogged filters can cause pressure drops, making compressors work harder to keep up. Badly designed piping can limit airflow, and not enough storage can lead to extra compressor cycling.
Compressed air dryers also deserve attention.
Their operating condition, sizing, and control settings can influence energy consumption and the quality of air delivered to production equipment.
For example, if a dryer isn’t working well, too much moisture can get into the compressed air system. This moisture can cause more maintenance issues and affect equipment that needs clean, dry air.
The condition of drains, filters, and other air treatment components should also be considered when evaluating system performance.
A comprehensive audit can help identify whether maintenance, equipment adjustments, or changes to the distribution system are necessary.
Taking a wider view matters because swapping out a compressor might not fix efficiency problems caused by other parts of the system.
Manufacturers need to know how the whole compressed air system is working before making a big investment in new equipment.
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Use Audit Findings to Build a Practical Improvement Plan
An audit is useful only if its findings lead to real improvements.
That doesn’t mean every recommendation will require a major investment. In many facilities, some of the most practical opportunities involve correcting problems that have developed gradually over time.
Depending on what may be uncovered, an improvement plan might include:
- Repairing compressed air leaks
- Replacing clogged or restricted filters
- Adjusting operating pressure
- Improving compressor sequencing and controls
- Addressing piping restrictions
- Evaluating air storage requirements
- Updating preventive maintenance schedules
- Repairing or replacing inefficient equipment
Bigger changes, like replacing compressors or changing the distribution system, should be weighed based on expected energy savings, installation costs, and how they affect production.
Manufacturers also need to consider how proposed changes will affect daily operations.
Cutting electricity use doesn’t help if it causes pressure problems or disrupts important production equipment.
That’s why recommendations should be ranked by cost, possible savings, equipment reliability, and what the operation needs.
Some improvements can bring quick benefits, while others are better added to future maintenance plans or equipment upgrades.
The best way is to use real operating data to see where changes will make the biggest difference.
How Preventive Maintenance Helps Preserve Energy Savings
Remember, improving compressed air efficiency isn’t something you do just once.
Leaks can appear, filters can clog, parts can wear out, and production needs can change. Without regular attention, many problems found in an audit can slowly come back.
Regular preventive maintenance helps facilities keep track of equipment condition, spot new problems early, and hold on to the improvements made after an audit.
Tasks like checking filters, monitoring operating conditions, servicing equipment, and fixing worn parts can help avoid wasting energy.
For manufacturers who want to keep their compressed air systems running well, a planned maintenance program is more reliable than waiting for equipment to show problems.
Engineering Sales Associates offers AirShield Preventive Maintenance Plans designed around equipment requirements and operating conditions. These plans help industrial facilities stay current with routine service while identifying potential problems before they interfere with equipment reliability.
Learn more about ESA’s AirShield Preventive Maintenance Plans and how scheduled service can help maintain compressed air system performance.
When Should You Consider an Air Compressor Audit?
You don’t have to wait for a major equipment problem before evaluating your compressed air system.
An audit may be worth considering when:
- Electricity costs are increasing without a clear explanation.
- Compressors appear to be running more frequently than they once did.
- Production equipment experiences inconsistent air pressure.
- Your facility has increased or retired major production equipment.
- There are multiple compressors operating, but without a coordinated control strategy.
- Maintenance teams suspect significant compressed air leakage.
- Management is considering replacing or expanding the compressed air system.
Even if equipment seems to be working fine, checking real performance can give you useful information for planning maintenance, setting budgets, and making future equipment decisions.
If you’re planning to expand your facility or replace equipment, an evaluation can be especially helpful. It shows whether your current system can handle new production needs.
Reduce Compressed Air Energy Costs with Engineering Sales Associates
To improve compressed air efficiency, start by understanding how your equipment is really performing.
For more than 60 years, Engineering Sales Associates has supported manufacturers and industrial facilities throughout North Carolina and South Carolina with compressed air equipment, installation, maintenance, and technical service.
That experience matters when checking system performance, since energy inefficiencies aren’t always caused by the compressor. Air leaks, pressure issues, controls, and equipment that no longer fits production needs can all add to operating costs.
If your facility has higher electricity bills, uneven pressure, or questions about compressor size, finding the real cause can help you make better choices about maintenance and equipment.
Is your compressed air system costing more to run than it should?
Reach out to Engineering Sales Associates to talk about your equipment, any concerns you have, and ways to improve your compressed air system’s efficiency.