What Happens If the Air Compressor Is Too Small for Drilling?
Choosing the right screw air compressor is critical in drilling projects. However, one of the most common mistakes is selecting an air compressor that is too small for the job.
In applications such as water well drilling, borehole drilling, and mining drilling, the air compressor is the main power source for the DTH (Down-The-Hole) system. A properly selected air compressor for mining drilling or air compressor for deep well drilling ensures stable performance, while an undersized unit can lead to serious efficiency problems.
A reliable rotary screw air compressor provides continuous airflow, which is essential for maintaining drilling speed and hole quality.
In drilling operations, compressor size is defined by two key parameters:
Air pressure (bar)
Airflow (CFM or m³/min)
These determine whether the air compressor for drilling can:
Drive the DTH hammer effectively
Remove cuttings from the hole
Maintain stable performance
For example, a 185 CFM air compressor may work for shallow drilling, but it is not suitable for air compressor for rock drilling in hard formations or deep well projects.
Using an undersized screw air compressor can cause several issues:
1. Slow Drilling Speed
Low pressure means insufficient impact force.
Result: Reduced efficiency and longer project time.
2. Poor Rock Breaking Performance
In hard rock conditions, insufficient pressure reduces hammer performance.
Result: Inefficient drilling and energy waste.
3. Hole Blockage and Re-Crushing
If airflow is too low, debris cannot be removed effectively.
Result: Blockage, repeated crushing, and poor hole quality.
4. Increased Tool Wear
Insufficient air supply increases stress on tools.
Result: Higher maintenance cost and downtime.
5. Higher Overall Cost
Although a smaller unit may have a lower screw air compressor price, it often leads to:
Longer drilling time
Increased fuel consumption
Frequent maintenance
Result: Higher total cost in the long run.
Both pressure and airflow must be properly matched in any air compressor for drilling.
Low pressure → weak hammer impact
Low airflow → poor debris removal
Typical requirements:
Medium drilling → 10 bar air compressor
Hard rock → 17 bar air compressor
Deep drilling → 25 bar high pressure screw air compressor
For larger projects:
400–750 CFM → Standard drilling
750–1100 CFM → air compressor for mining drilling
Advanced configurations such as two stage screw air compressors or VSD screw air compressors can further improve efficiency and energy savings.
Many buyers select compressors based only on price, ignoring real requirements.
Common mistakes:
Choosing the lowest screw air compressor price
Ignoring drilling depth and rock hardness
Not matching compressor with DTH hammer
As a result, the selected diesel screw air compressor or portable screw air compressor may be too small for the application.
To select the correct air compressor for borehole drilling or mining:
Consider drilling depth
Evaluate rock condition
Check hole diameter
Match with drilling tools
Typical configurations:
100–150m → Small portable screw air compressor
150–300m → Medium diesel screw air compressor
300–500m → industrial screw air compressor
500m+ → high pressure screw air compressor
For deep projects, a high-capacity air compressor for deep well drilling is required.
A portable screw air compressor is widely used due to its flexibility.
However:
185 CFM → Shallow drilling
400–750 CFM → Medium drilling
900+ CFM → air compressor for mining drilling
Choosing the wrong size can reduce efficiency and increase costs.
Q: What happens if the air compressor is too small for drilling?
A: It leads to slow drilling, poor performance, and higher cost.
Q: What is the best air compressor for mining drilling?
A: A high pressure screw air compressor with sufficient airflow is recommended.
Q: What size air compressor is needed for deep well drilling?
A: Typically 25 bar and 900+ CFM, depending on conditions.
