How much extra energy does pressure drop cost in a compressed air system?

According to Compressed Air Challenge fact sheets (May 2026), flow restrictions of any type in a compressed air system require higher operating pressures than are needed, resulting in higher energy consumption; as a rule of thumb, every 2 psi increase in operating pressure requires an additional 1% in operating energy costs.

Does lowering the compressor set pressure save energy?

The Compressed Air Challenge Fact Sheet #4 (May 2026) says that if the compressor discharge pressure can be reduced, significant savings can be achieved, and advises checking the manufacturer's performance data at different discharge pressures.

Is the 1 percent per 2 psi rule exact?

No. The Compressed Air Challenge Fact Sheet #1 (May 2026) calls it a rule of thumb, and Fact Sheet #4 (May 2026) advises checking with the compressor manufacturer for performance specifications at different discharge pressures.

Why does pressure drop in compressed air cost energy?

Pressure drop is the reduction in air pressure between the compressor discharge and the point of use. The Compressed Air Challenge Fact Sheet #4 (May 2026) says flow restrictions of any type require higher operating pressures than are needed and that excessive pressure drop results in poor system performance and excessive energy consumption; Fact Sheet #11 (May 2026) says the complete drying, filtration and distribution system should be sized and arranged so that the total pressure drop from the air compressor to the points of use is much less than 10% of the compressor discharge pressure.

How much energy

Compressed Air Challenge Fact Sheet #1 (May 2026): a rule of thumb is that every 2 psi increase in operating pressure requires an additional 1% in operating energy costs.
Compressed Air Challenge Fact Sheet #4 (May 2026): elevating system pressure increases unregulated uses such as leaks, open blowing and production applications without regulators or with wide open regulators; this added demand at elevated pressure, which the fact sheet calls artificial demand, substantially increases energy consumption.
ULTRASEC datasheet (Ultra Controlo): the estimated power consumption for an increase of 1 bar on the compressor is about 7% of the installed motor power.
ULTRAOX technical data sheet (Ultra Controlo, 2022): for every 1 bar increase in compressor pressure, total electricity consumption increases by 7%.

Where pressure is lost

The 2016 DOE sourcebook names the aftercooler, lubricant separators, air treatment equipment and check valves as the most typical problem areas. On the supply side, air/lubricant separators, aftercoolers, moisture separators, dryers and filters can cause significant pressure drops; in the distribution system, the highest drops are usually at the points of use, including undersized or leaking hoses, tubes, disconnects, filters, regulators and lubricators. Its example: if a regulator is set at 85 psig and an upstream filter has a 20 psi pressure drop, the system upstream has to maintain at least 105 psig.

How the 2016 DOE sourcebook says to reduce pressure drop

Select aftercoolers, moisture separators, dryers and filters with the lowest possible pressure drop at the specified maximum operating conditions.
Size main lines for maximum flow, allowing for growth.
Install differential pressure gauges across dryers and filters, and change filter elements when the pressure drop approaches the manufacturer's maximum.
Treat a higher compressor discharge pressure or extra compressor capacity as the last resort, because both may significantly increase energy consumption.

For hospital medical gas pipelines, HTM 02-01 (2026), the NHS England guidance, says pipe sizes should be selected so that the pressure loss is below 5% of the nominal pipeline pressure. In the ULTRASEC refrigeration dryer, the datasheet credits an aluminium heat exchanger with very low pressure losses and states a low pressure drop even with load variations.