The Benefits of Operating at Lower Pressure and How to Lower Your Facility’s Operating Pressure – National Compressed Air

When it comes to compressed air systems, higher pressure does not always mean better performance.

Many facilities operate their compressed air systems at a higher pressure than necessary simply because “more pressure” seems like a safe way to ensure their equipment has enough air. In reality, unnecessarily high operating pressure can increase energy consumption, worsen air leaks, reduce equipment efficiency, and increase operating costs. All of which can negatively impact your bottom line.

Reducing your facility’s compressed air pressure, even by a relatively small amount, can create meaningful energy savings when the system is properly evaluated and adjusted.

Why Operating at Lower Pressure is Beneficial for your Facility

The higher the your system’s operating pressure, the more work your compressor has to do.

If your facility’s equipment only requires 100 PSI but the compressor system is maintained at 125 or 130 PSI, you may be spending energy to produce pressure that your applications never actually use.

1. Lower Energy Consumption

One of the biggest benefits of reducing operating pressure is lower energy consumption.

Compressors generally require more energy to produce higher discharge pressures. By reducing system pressure to the lowest practical level, your compressor can operate more efficiently and avoid producing unnecessary pressure.

For facilities operating compressors for long periods, even a modest reduction in pressure can translate into significant annual energy savings.

2. Reduced Air Loss Through Leaks

Compressed air leaks are one of the most common sources of wasted energy in industrial facilities. The higher the system pressure, the greater the amount of air that can escape through a leak.

For example, a small leak that may seem insignificant at a lower pressure can become a much larger source of wasted compressed air as system pressure increases.

Reducing pressure can therefore help reduce the amount of compressed air lost through existing leaks—although leak detection and repair should always remain an important part of an overall compressed air efficiency program. NCA Ltd. offers both air audit and leak detection services to help navigate air leaks/air loss issues.

3. Less Stress on the Compressor

Operating at unnecessarily high pressure can place additional demands on your compressor.

If your system does not actually require the higher pressure, reducing the pressure can allow the compressor to operate under less demanding conditions.

This can contribute to:

• Reduced energy consumption
• Lower operating temperatures
• Reduced mechanical stress
• Improved compressor efficiency
• Potentially longer equipment life

4. Lower Operating Costs

The combination of reduced energy consumption and less wasted compressed air can have a direct impact on your facility’s operating costs.

For facilities with large compressed air systems or significant daily demand, optimizing pressure can be an effective way to reduce the cost of producing compressed air without sacrificing production.

How Much Pressure Does Your Facility Actually Need?

Before lowering your system pressure, it is important to determine the actual pressure requirements of your facility’s equipment.

Start by identifying the minimum pressure requirements for the applications that use compressed air.

Consider:

• Production equipment
• Pneumatic tools
• Pneumatic cylinders
• Control valves
• Air-operated machinery
• Process equipment
• Blow-off applications
• Equipment located farthest from the compressor room

The key is to identify the application with the highest required pressure and determine whether that requirement is genuinely necessary.

It is also important to account for pressure losses throughout the distribution system.

For example, if a piece of equipment requires 100 PSI but is receiving only 92 PSI because of restrictions in the piping, filters, dryers, or other components, simply increasing compressor pressure may mask the underlying problem.

How to Lower Your Facility’s Operating Pressure

Reducing pressure should not simply mean turning down the compressor setpoint and hoping everything continues to work.

A proper pressure optimization process should evaluate the entire compressed air system.

Step 1: Identify Your Current Operating Pressure

Start by determining the pressure at which your compressors are currently operating.

Focus on:

• Compressor discharge pressure
• Lead/lag settings
• Load/unload settings
• System pressure
• Pressure at the main header
• Pressure at critical points of use

This provides a baseline for understanding where pressure is being generated and where it is being lost.

Step 2: Determine the Minimum Required Pressure

Identify the equipment that requires the highest pressure and verify the manufacturer’s recommended operating range.

Do not automatically rely on historical settings. A system that has operated at 125 PSI for years may not actually need 125 PSI.

Your facility’s requirements may have changed as equipment was replaced, production processes changed, or compressed air demand evolved.

Step 3: Check for Pressure Drops

If there is a large difference between compressor discharge pressure and the pressure available at points of use, investigate why.

Potential causes include:

• Undersized piping
• Clogged or overloaded filters
• Poorly sized dryers
• Restrictions in valves or fittings
• Long distribution runs
• Inadequate piping layouts
• Excessive pressure drop across treatment equipment

Fixing these restrictions can sometimes allow a facility to lower compressor pressure without making any changes to production equipment.

Step 4: Repair Compressed Air Leaks

Leaks can make pressure optimization much more difficult.

A compressor may be working harder simply to maintain pressure that is being lost through leaks throughout the facility.

A leak detection program can help identify and quantify these losses so repairs can be prioritized. NCA Ltd. can facilitate a leak detection solution for your facility. Regular leak detection/inspections should be part of your facility’s preventive maintenance program. Leaks are losses!

Step 5: Optimize Point-of-Use Pressure

Not every application needs the same pressure.

Instead of operating the entire facility at a high pressure to satisfy one application, consider whether that individual application can be addressed locally.

Point-of-use regulators can help provide the appropriate pressure to individual equipment while allowing the main system to operate at a lower pressure.

This can be particularly useful when only a small portion of the facility requires higher pressure.

Step 6: Lower the Compressor Pressure Gradually

Once the system has been evaluated, pressure can be reduced in controlled steps.

Monitor the system after each adjustment to ensure critical equipment continues to operate reliably.

Pay attention to:

• Production performance
• Compressor loading/unloading
• System pressure stability
• Equipment performance
• Pressure at critical points of use
• Compressor operating hours

The goal is not simply to achieve the lowest possible pressure. The goal is to find the lowest pressure that reliably meets your facility’s requirements.

Don’t Compensate for a Poorly Designed System With Higher Pressure

One of the biggest mistakes facilities can make is using higher compressor pressure to compensate for problems elsewhere in the system.

For example, if a compressor is set to 125 PSI because a production machine only receives 100 PSI, increasing compressor pressure may appear to solve the problem.

But if the system has excessive pressure drop caused by undersized piping, clogged filters, or inadequate air treatment equipment, the higher pressure is only masking the underlying issue.

Correcting the pressure drop may allow the entire system to operate at a lower pressure.

What About Variable Speed Compressors?

Quincy Variable speed drive (VSD) compressors from NCA Ltd. can be particularly beneficial for facilities with fluctuating compressed air demand.

Rather than simply operating at a fixed pressure and capacity, a properly configured VSD compressor can adjust output to better match system demand.

Keep in mind, VSD technology does not eliminate the importance of proper system pressure management. A compressor that is capable of efficiently producing air at a given pressure can still waste energy if the facility is operating at a pressure significantly higher than necessary.

Lower Pressure Doesn’t Mean Sacrificing Performance

The objective of pressure optimization is not to reduce pressure at the expense of production.

Instead, it is about eliminating unnecessary pressure while ensuring every critical application receives the air it needs.

A properly optimized compressed air system should provide:

• Reliable pressure at points of use
• Efficient compressor operation
• Minimal pressure drop
• Reduced air leakage
• Appropriate air treatment
• Consistent production performance

In many facilities, there is an opportunity to reduce operating pressure simply by understanding where compressed air is being used and where pressure is being lost.

Let NCA Ltd. Help Optimize Your Compressed Air System

Not sure whether your facility is operating at the right pressure?

NCA Ltd. can help evaluate your compressed air system, identify opportunities for improvement, and determine whether your facility can safely reduce operating pressure.

From compressor selection and system design to leak detection, air treatment, and preventive maintenance, optimizing the entire system can help reduce energy consumption and operating costs while maintaining reliable compressed air for your production needs.

Before turning up the pressure, find out where you’re actually losing it.

Contact NCA Ltd. today to discuss your compressed air system and find opportunities to improve efficiency.

Phone: 519-659-2691
Email: [email protected]