You’ve decided that your current application needs compressed air. You’ve also figured out how much air you need, how to drive the compressor, and what engine you will use to power it. Now it’s time to decide what air compressor best suits your needs!
There are three styles of air compressors commonly found in mobile industrial applications:
- Reciprocating/Piston Compressors
- Rotary Screw Compressors
- Rotary Vane Compressors
Each of these air compressors has benefits and challenges, which we will break down in this article.
Reciprocating Compressors
Reciprocating compressors are the most common air compressors found in mobile applications and are the type most people are familiar with. Numerous manufacturers and suppliers worldwide offer an array of reciprocating compressor options, making them easy to acquire.
Benefits
- Low initial cost
- Easiest to service & rebuild
Of the three compressor types, reciprocating air compressors generally have the lowest initial purchase price and are suitable for low-duty cycle operations. Most reciprocating compressors can also be serviced or rebuilt in the field with simple hand tools, which is an advantage over vane and screw compressors.
Challenges
- Large & heavy
- Many moving, wearable parts
- Higher air temperature
- Excessive pulsation
- Requires an air receiver tank
Reciprocating compressors are typically the largest and heaviest when compared to compressors of equal CFM. They have the most moving parts and, like the vane compressor, experience increasing amounts of oil carryover. Because of how reciprocating compressors produce air, more after-treatment is required to reduce air temperatures and pulsation before the compressed air reaches your tools and equipment. An air receiver tank is also required with a reciprocating air compressor and takes up additional space.
Rotary Screw Compressors
Traditionally, rotary screw compressors were used in stationary applications and were not widespread in mobile applications. However, times have changed! Rotary screw compressors have become more affordable, and their benefits are well recognized across diverse industries. Today, rotary screw air compressors are used in numerous industrial applications and are being manufactured by companies around the world, including VMAC.
Benefits
- Continuous duty cycle
- High air flow delivery
- Compact size
- No air receiver tank required
- Few wearing parts
- Easy maintenance
Rotary screw air compressors are small but mighty systems, delivering serious air at continuous duty cycles. The compressors are compact and don’t require an air receiver tank, allowing them to fit in tight spaces. Best of all, maintenance is minimal and easy due to the minimal parts.
Challenges
- Higher initial cost
- Requires routine maintenance
Rotary screw compressors generally have a higher initial cost when compared to the other compressor types but last longer because they have fewer wearing parts. Most screw compressors found in mobile applications are oil-injected, utilizing an independent lubrication circuit. The oil used is specific to the compressor, and the system will require routine maintenance.
Rotary Vane Compressors
The rotary vane compressor is the least common of the three common compressor types in mobile applications. There are fewer vane compressor manufacturers than reciprocating compressor manufacturers, and service parts can be more challenging to find.
Benefits
- Fewer moving parts
- Compact
- Continuous-Duty
- Low pulsation
- Low initial cost
Like the rotary screw compressor, the rotary vane air compressor has fewer moving parts when compared to a reciprocating option. Vane compressors are also compact compared to reciprocating and rotary screw compressors when comparing equal CFM compressors. They are designed for continuous duty and deliver a relatively pulsation-free air flow to your tools or equipment. The rotary vane compressor generally has a lower initial purchase cost.
Challenges
- Hard to find service parts
- Difficult to get service support
- Expensive rebuilds
As with other wearing compressors, oil carryover increases the longer it is in service. A complete rebuild is required to prevent this, which is expensive. Finding service parts and support can also be a challenge.
Choosing An Air Compressor
When choosing a compressor for your mobile application, there are many factors to consider. The initial purchase price, ease of and cost of maintenance, size, availability, airflow, and longevity are all critical for your overall satisfaction with your compressor. Knowing which compressor meets your needs is essential in finalizing your industrial compressor system decision.
Visit our OEM page to discover how VMAC can help you build your custom industrial application!
