Quality abrasive blasting demands a reliable compressed air supply able to keep up with ongoing media usage. But with countless compressor options on the market, selecting the ideal sandblasting unit can be daunting. What key factors should you consider when buying an air compressor for sandblasting dedicated to abrasive blast cleaning? Let’s explore the critical decision points.
Sizing the Compressor
Determining the appropriate air volume and pressure is a crucial first step in ensuring the success and efficiency of a sandblasting operation. Sandblasting is a process that requires substantial airflow to effectively propel the abrasive media through the hoses, nozzles, and onto the work surfaces. Failing to provide adequate air supply can lead to frustrating issues, such as frequent pressure drops and interruptions in the blasting process.
When considering the air requirements for your sandblasting setup, there are several key factors to take into account.
Maximum nozzle orifice size and number of blast hoses running simultaneously: The size of the nozzle orifice and the number of blast hoses in use will directly impact the air volume required. Larger nozzles and multiple hoses will demand a higher airflow to maintain the necessary blast pressure.
Required blast pressure range for your applications: Different applications may require varying blast pressure ranges to achieve the desired surface preparation or cleaning results. Ensure that your air compressor can consistently deliver the required pressure range for your specific needs.
Typical workpiece size and blast area: The size of the workpieces and the total blast area will influence the air volume requirements. Larger surfaces or multiple parts being blasted simultaneously will necessitate a higher air supply.
Anticipated daily blasting time: The duration and frequency of your daily blasting operations will help determine the appropriate air compressor size. Continuous or extended blasting periods will require a more robust air supply to maintain consistent performance.
Allowance for tool usage like blowguns or air tools: In addition to the sandblasting process, you may need to account for the air consumption of other pneumatic tools or equipment used in your workspace. Factoring in these additional air demands will ensure that your compressor can meet the overall requirements.
By carefully considering these factors, you can select an air compressor with the appropriate capacity and capabilities to power your sandblasting operations effectively. This will help prevent frustrating interruptions, ensure consistent blast pressure, and maintain the desired productivity levels throughout your sandblasting processes.
Compressor Types
There are two main compressor categories to choose from:
Piston Compressors
Reciprocating piston compressors use cylinders with offset intake and exhaust strokes to generate flow. The design delivers high pressures up to 300 PSI, but a pulsing air supply. Large multi-stage units minimize pulsation. While affordable, maintenance demands are higher with many moving parts. Oil lubrication raises contamination risks requiring filters and separators.
Rotary Screw Compressors
These efficient models use intermeshing helical screws to continuously compress inlet air without pulsation. While pricier, the reduced maintenance and smooth airflow suit abrasive blasting well. Oil-free designs eliminate contamination risks for critical finishing processes while sealed bearings cut maintenance. Efficient variable speed operation saves energy during reduced demand. High airflow ratings match multiple hose needs.
Electric versus Gas/Diesel
Both gas/diesel engine-driven and electric motor-driven compressors work for sandblasting. Consider factors like:
- Available power supply – engine units allow job site mobility
- Energy efficiency and operating costs
- Required runtime (duty cycle)
- Weatherproofing for outdoor location
- Emissions when running indoors
- Noise levels
Key Features
Look for additional functionality fitting your work environment:
Air Dryers
Moisture contaminates abrasive media and surfaces while promoting nozzle clogs. Choose built-in air dryers or filters to maintain clean, dry airflow. Desiccant models with electronic dew point control deliver optimal media protection.
Storage Capacity
Air receivers help meet peak demand so compressors aren’t constantly cycling on and off. Large capacity receivers of 120 gallons plus allow meeting quick pressure surges.
Noise Reduction
Compressor enclosures, intake silencers and vibration dampening features reduce abrasive work noise levels. Sound attenuation promotes safer, more comfortable working conditions.
Portability
Job site mobility may require trailer-mounted gas/diesel compressors. Or compact electric units with lift bails and all-terrain wheels.
Advanced Control
Sophisticated electronic controls enable remote monitoring, sequencing multiple units, and optimizing efficiency. Touchscreen interfaces and automated features simplify compressor operations.
Aftercoolers
Intercooling and aftercooling condenses moisture between compression stages. This keeps outlet air suitably dry for blasting needs while allowing continuous duty cycles.
The Blasting System
Beyond the compressor selection, also factor in the entire abrasive blasting system needs including:
Blast Pots
The vessels containing pressurized media awaiting flow come in a range sizes and materials:
- Portable pots under 100 lbs for small jobs
- Larger steel pots up to 500 lbs
- Heavy-duty stainless steel pots for industrial use
- Automated pressurized feed pots
Manual pots require frequent filling. Larger units extend time between refills but weigh substantially more when moving to job sites. Consider pot size in the context of your applications.
Remote Controls
Handheld metering valves allow adjusting media flow right at the blast nozzle for better mobility. Low-pressure remote controls keep blast pots safely pressurized for quicker startup.
Blast Hoses
Flexible hoses ranging from 1/2 to 2 inches in diameter convey media from pots to nozzles. Consider hose length needs based on work areas and mobility requirements. Lightweight rubber hoses ease positioning. Use hose reels or carriers to protect hoses when not blasting.
Nozzle Selection
A quality blasting nozzle is vital for controlling the concentrated abrasive stream hitting the work surface. Consider nozzle material durability, orifice size, interchangeable nozzle components, and flow characteristics for the pressures and media you’ll use.
Personal Protective Equipment (PPE)
Don’t neglect factors like air-fed abrasive blasting hood requirements that affect air volume demand. Any breathing air systems or non-blasting tools tapping into air lines also impacts sizing.
Conclusion
With heavy utilization, inspect and service compressors based on hourly run time more frequently than the calendar alone. Tasks like replacing inlet filters keep operation optimized. Don’t cut corners on maintenance.
Proper air compressor selection, installation, operation, and care ensure your sandblasting productivity won’t suffer from lack of sufficient clean air. Leverage the manufacturer’s expertise along with staff training to maximize compressed air supply reliability.
