How much energy does 2 psi of pressure drop cost?

Every 2 psi of extra discharge pressure adds roughly 1% to compressor power, so a 100 hp unit running continuously loses about 0.75 kW for each 2 psi.

When should a filter element be changed?

Change on differential pressure, typically at 3–5 psid, rather than on a fixed calendar interval; a clogged element can quietly cost more than the element.

What total pressure drop is acceptable?

A well-designed distribution system holds total drop from the compressor to the point of use under about 10% of discharge pressure.

Air Compressor Pressure Drop Energy Cost Calculator

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Formula

$/yr = Compressor kW × (ΔP / 2 psi) × 1% × hrs/yr × $/kWh

Plugged filters, dirty dryers, and undersized pipe all force the compressor to run at higher discharge pressure. Each 2 psi costs about 1% in energy.

Compressor motor

Average load

Motor efficiency

Pressure drop

psi

Operating hours

hr / yr

Electricity rate

$/kWh

Annual cost of this ΔP

$1021

7295 kWh/yr · 4.0% extra load

Compressor full-load kW60.8 kW

Extra kW from ΔP1.82 kW

A filter element change usually pays for itself in weeks at this rate. Log ΔP monthly and replace at 7 psid coalescing / 10 psid particulate.

Typical ΔP budget (clean)

Particulate filter: 1–2 psi
Coalescing filter: 2–3 psi
Refrigerated dryer: 3–5 psi
Desiccant dryer: 3–7 psi
Distribution piping: 2–5 psi total

Total system ΔP target: ≤ 10% of discharge (≈ 10 psi at 100 psig). Above that, energy savings from cleaning pay back fast.

How to use this calculator

Convert filter or piping pressure drop into extra electrical cost per year.

Enter compressor horsepower or measured input kW.
Enter the measured pressure drop across the filter, dryer or piping.
Enter annual run hours and electricity rate.
Read the added annual cost of running higher discharge pressure to overcome the drop.

Frequently asked questions

How much energy does 2 psi of pressure drop cost?: Every 2 psi of extra discharge pressure adds roughly 1% to compressor power, so a 100 hp unit running continuously loses about 0.75 kW for each 2 psi.
When should a filter element be changed?: Change on differential pressure, typically at 3–5 psid, rather than on a fixed calendar interval; a clogged element can quietly cost more than the element.
What total pressure drop is acceptable?: A well-designed distribution system holds total drop from the compressor to the point of use under about 10% of discharge pressure.