Why Adding a Second Compressor Doesn’t Always Solve the Problem
When compressed air systems struggle to keep up, the first instinct is often simple: add another compressor. On the surface, it makes sense. More equipment should mean more capacity. But in many cases, adding a second machine without addressing the root issue creates new inefficiencies instead of solving the original problem.
At Gordon Air Compressor, we regularly evaluate systems where a second compressor was added as a quick fix—only to discover that the underlying problem was never addressed.
Capacity Isn’t Always the Issue
Before adding equipment, it’s critical to determine whether the system truly lacks capacity—or if something else is limiting performance.
Common root causes include:
Air leaks
Excessive pressure drop
Undersized piping
Inadequate air storage
Improper control settings
If these issues exist, adding another compressor simply increases energy use while the real problem remains.
Poor Staging Creates Inefficiency
When multiple compressors operate without proper staging or control coordination, they can work against each other.
Improper staging often leads to:
Both compressors running partially loaded
Frequent short cycling
Increased wear
Higher energy consumption
Without intelligent control logic, adding equipment can reduce overall efficiency.
Storage Matters More Than Most Facilities Realize
A lack of air storage is frequently mistaken for a lack of compressor capacity.
Insufficient storage:
Causes pressure swings during peak demand
Forces compressors to react aggressively
Increases cycling frequency
Sometimes adding properly placed receiver tanks stabilizes the system more effectively than adding another compressor.
Pressure Problems Often Drive Expansion Decisions
Facilities often add a second compressor because pressure drops during peak use. Instead of evaluating pressure loss sources, they assume more air production is needed.
Pressure drops commonly result from:
Restrictive piping layouts
Dirty filters or dryers
Long distribution runs
Excess fittings and elbows
Correcting these issues can restore performance without increasing installed horsepower.
Energy Costs Can Rise Quickly
Adding a second compressor increases electrical demand. If both machines operate inefficiently due to poor staging or system imbalance, energy costs can climb sharply.
Two compressors running poorly:
Consume more energy than one properly sized system
Increase peak demand charges
Generate more heat
Require more maintenance
More equipment does not automatically mean better efficiency.
When Adding a Second Compressor Does Make Sense
There are situations where expansion is the correct solution.
Adding a second compressor is appropriate when:
Demand has permanently increased
The original compressor is properly sized but insufficient alone
Redundancy is required for uptime
The system is properly staged and controlled
The difference lies in planning and system evaluation—not impulse.
Redundancy vs. Compensation
Adding a second compressor for redundancy (backup protection) is very different from adding one to compensate for system inefficiencies.
Redundancy improves reliability.
Compensation increases cost.
Understanding the purpose behind expansion is critical to making the right decision.
Evaluate Before You Expand
Before investing in additional equipment, a thorough system evaluation often reveals opportunities for improvement without expansion.
Proper evaluation considers:
Actual airflow demand
Pressure stability
Storage capacity
Piping design
Control coordination
Correcting design flaws frequently delivers the performance facilities expect from a second compressor.
Smarter Expansion Leads to Better Results
Adding equipment should strengthen your compressed air system—not complicate it.
When expansion is planned carefully and supported by proper staging and system design, performance improves predictably. When it’s reactive, inefficiencies multiply.
If your facility is considering adding another compressor, a full system review is often the smartest first step.
We would love to help with your compressed air needs!
📞 901-327-1327
📍 706 Scott Street, Memphis, Tennessee 38112
📞 Emergency Service Available @ 901-482-5925
