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By Ron Marshall

The steel plant had been running its compressors at 120 psi for as long as anyone could remember. The air system was powerful and reliable, or so it seemed. But when energy costs started climbing, management called in a compressed air auditor to see if there were hidden savings.

When the auditor arrived, he didn’t bring promises of shiny new equipment. Instead, he began with one simple question: “What pressure do you actually need to run production?” The maintenance manager shrugged. “We’ve always used 120 psi, it keeps things safe.” The auditor smiled. “Maybe. But let’s find out what it’s costing you.”

Using a few strategically placed gauges, the auditor tracked pressures throughout the system: from the compressor room to the far end of the plant. He found something interesting. Although compressors delivered up to 125 psi, many of the tools and machines on the floor only needed 90 psi to operate properly.

The difference came down to pressure drop, these are losses caused by undersized piping, clogged filters, and poorly maintained regulators. These restrictions forced operators to keep compressor discharge higher just to maintain adequate pressure at the end-use points. “Instead of running the whole system at high pressure,” he explained, “let’s fix the restrictions so we can safely lower it.”

Over the next few months, the maintenance team followed his plan. They cleaned filters, checked piping, and added a pressure/flow controller along with an extra air receiver to handle surges. Then, together, they slowly began lowering the system pressure in small increments, monitoring every step.  To everyone’s surprise, production didn’t notice a thing. Machines ran smoothly, tools had plenty of power, and the compressors ran less often.

After a while, the system stabilized at 90 psi, with the compressors delivering 100 psi. Power meters told the story clearly, energy use had dropped by almost 13%. “Every 2 psi we drop saves about 1% on power,” the auditor reminded them. “And you’ve just reduced by 25 psi.”

Better yet, the compressors cycled less frequently, meaning less wear and fewer maintenance issues. What started as a cost-saving project had turned into a reliability upgrade as well.

At the year end production meeting, the plant manager proudly shared the results: lower energy bills, steadier pressure, and happier operators. The maintenance manager laughed, “All we did was turn the knob the right way.” The auditor smiled. “That’s the thing about compressed air systems, sometimes the biggest savings come from using less of what you already have. ”By learning to question “the way we’ve always done it,” the steel plant not only saved thousands each year but also gained a more stable and efficient system.

The lesson was simple yet powerful: measure, understand, and adjust. The right pressure isn’t just about keeping machines running, it’s also about keeping money from escaping with every unnecessary psi of air.