? about pot style sand blasters | The Garage Journal

I have been researching sand blasters and blast cabinets for several weeks and am having trouble making a decision. I restore Jeep CJ's as a hobby and frequently need to clean up old rusty parts. The problem is that the parts range in size from nuts/bolts to axle housings to complete frames. The blast cabinets I have seen from TP and BadBoy have good reviews but start to get really expensive when you get up to the sizes that could fit a complete axle housing ($+ for anything over 52" long). In addition, even if I get a big cabinent, I still can't do any frame work. Lastly, this is something I would use a few times per year (for large items) but the footprint of a cabinet that big would take up alot of room in the garage.

So, I starting looking into pot style blasters but they seem to vary greatly in price. HF units are around $100 and BadBoy units go all the way to $1k. I don't mind paying more as long as the expense is worth it (better reliability/less clogs/more media options). I have all kinds of room outside so I won't have any issues with blowing media around and I still break out the angle grinder or wire wheel for the small parts.

I have a IR T30 two stage 5 HP compressor with an 80 gallon tank.

I have looked into outsourcing to local shops but only one will blast and prime but they are always 4-6 weeks behind schedule. I am worried about blast only places because of flash rust covering everything up before I get a chance to spray a coat of primer on. In addition, at the rates they charge it would only take a few jobs before I spent more than what I could get a decent unit for.

Any suggestions on pot vs. cabinets and what brand to get would be greatly appreciated. i've got, and love, a smaller TP cabinet - works phenomenally well with clean dry air. there is just no getting around that it is limited in piece size though. like you said, never getting one that you can do a frame in. i think the big issue with a pressure pot is the 'overspray' - you really need an enclosed space (tarps?) to work in unless you've got an outdoor workspace not particularly close to anyone else. its also more expensive since its difficult to recycle the media like you do with a cabinet.

perhaps if you lay down tarps you could fold them up and recycle the media? maybe buy one of the $75 EZ-Ups and hang tarps on the sides to keep it all contained?

ahm I also have both.

My pressure (pot style) blaster is one that I made myself over 20 years ago out of a forklift propane cylinder. It has a deadman valve as Farmall400 suggests. It was my first sandblaster and I still use it, in fact I will be using it tomorrow. I have used it to clean up truck frames and car and body parts, old tractors, and even lawn furniture. Although there is a definite learning curve on body parts, to use it without warping the metal. Also, as stated, dry air works best. I started just using air straight from the compressor and would have problems with moisture causing clogging. I added a refrigerated air dryer and it made a world of difference.

I don't want to amke a big deal out of this, however, one thing to consider with a pressure style is protection (and comfort) for you. Some of the media, especially sand, can be harmful to breathe. You can search information on the internet if you want to learn more. I started with a pillowcase, goggles, and a dust mask - which was hot and miserable. Then I went to a canvas blast hood, which was not much different. I then purchased a supplied air system with a blasting helment made by Bullard. You can also use it for paint work with a different hood. I figured that I would be doing a lot of blasting and painting over my life so the investment was worth it to me to for my protection. However, it really does make a huge difference in my comfort level when blasting.

I also have a cabinet style made by TP. Like most cabinets, it uses a siphon style gun. What drove me to buy the cabinet was convenience - you don't have to drag everything outside and set it up to do a few small parts. You can also blast regardless of the weather.

I run both off of the same compressor, a 5hp C-aire, with a dryer as mentioned above. The pressure blaster will clean faster than the cabinet/siphon in my experience. My long term plan is to add additional compressor capacity to be able to run the cabinet with faster results.

To do the larger parts that you described, frames and rear ends, I would recommend a pressure blaster. But do yourself a favor and read up a bit on the breathing hazards and determine what you are comfortable with in that regard.

- David

Anybody else with first hand experience with pot style blasters?

I may ultimately end up with a small cabinet as well but I need something that I can take outside and blast away on the big stuff. Not to worried about making a mess because I don't have neighbors and I don't care about reclaiming the media since I don't plan to use it that much (for now anyways!).

sevensandeights - see my post above. When I blast outside on the driveway beside my garage I usually do it on a big old poly tarp that I hang on the wall and across the drive. I don't always reclaim the sand but it sure makes the clean up a lot easier. I have also done some things on the grass in the back yard ... no clean up at all. I too have a tip/san-blast/Brut 100lb machine with the cougar valve, it's a great machine! I went and looked at the 2 others you posted. I would still buy the Brut machine over the other 2.
Why?
Although the Texas blaster has some nice "features" it also has one I don't like. The cheap ass valve on the end of the sand hose, it will last only a few times before the sand completely destroys it. When I first got my TIP it too had a ball valve on it ( a HARDENED steel valve) and it got chewed up fast, the brass valve doesn't stand a chance. The other machine also had this setup. The dead man valve that Brut uses is a good compromise on a cheap sand pot. The one feature that the Brut lacks is the 3/4" sand hose. Tthis will not effect most small shop/home shop users though as it will not become a problem ( the 1/2" hose) until you get into a nozzle size that is much larger than a 10hp compressor can run.

William....

what is the advantage of a deadman valve verses the one like on my HF where you have a ballvalve on the end of the hose where you install the tip. any pointers will be helpful we just started with the sandblaster this morning.
will a bigger tip clean a larger area or at the same pressure will it just eat up more air volume making compressor run more?

A deadman valve has a couple advantages but the main one is that it won't wear out like a ball valve will. A ball valve is constantly getting blasted with shot which will wear it down. A deadman valve uses a piece of rubber that caps the tip of the nozzle. This rubber will also wear out but it will take a little longer and also the rubber is cheap and easy to replace. Also sand seems to get stuck in the valve and cause issues. The deadman is also easier to use, just squeeze the handle and go and when you want to stop just let go. With a ball valve you need two hands to turn the handle on and off.

A bigger tip will eat up a lot more air. A 3/32" tip uses 7CFM, a 1/8" uses 15 CFM and a 5/32" uses 25CFM. So the bigger the tip the more air you need.

Are you tired of inefficient sandblasting due to the wrong air compressor? Selecting the perfect air compressor is crucial for achieving optimal results in your sandblasting projects.

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In this article, we'll guide you through the essential factors to consider when choosing an air compressor for sandblasting. We'll discuss the importance of CFM, PSI, and nozzle size, as well as the different types of air compressors suitable for the job.

By the end of this post, you'll have a clear understanding of how to select the best air compressor for your sandblasting needs, ensuring a powerful and efficient performance every time.

What is Sandblasting?

Sandblasting, also known as abrasive blasting, is a process that uses compressed air to propel abrasive materials against a surface. It is used to clean, smooth, or shape various surfaces by removing rust, paint, or other coatings.

How Sandblasting Works

The sandblasting process involves the following steps:

1. Compressed air is generated by an air compressor.

2. The compressed air is mixed with abrasive media, such as sand, in a blast pot.

3. The mixture is then propelled through a nozzle at high velocity onto the surface being treated.

4. The abrasive particles impact the surface, removing contaminants and creating a desired finish.

Different Types of Sandblasters

There are three main types of sandblasters, each with its own method of introducing abrasive media into the compressed air stream:

Gravity-Fed Sandblasters

• Abrasive media is stored in a hopper above the nozzle.

• Gravity pulls the media into the air stream when the trigger is pressed.

• Simple design and easy to use.

Pressure Blasters

• Abrasive media is stored in a pressurized vessel.

• Compressed air and media are mixed in the vessel before being propelled through the nozzle.

• Provides a consistent media flow and requires minimal maintenance.

Siphon Sandblasters

• Abrasive media is stored in a separate container below the nozzle.

• Compressed air passing through the nozzle creates suction, drawing the media into the air stream.

• Versatile and cost-effective option.

Applications and Benefits of Sandblasting

Sandblasting is used in various industries for multiple purposes:

• Removing rust, paint, and other coatings from metal surfaces

• Preparing surfaces for painting, coating, or welding

• Creating decorative finishes on glass, wood, or stone

• Cleaning and maintaining industrial equipment

• Restoring automotive parts and furniture

The benefits of sandblasting include:

• Efficient removal of contaminants and coatings

• Ability to create specific surface finishes

• Versatility in application across different materials and industries

• Cost-effective compared to other cleaning or surface preparation methods

How Air Compressors Are Used in the Sandblasting Industry

Air compressors play a crucial role in the sandblasting industry. They provide the necessary power and control to efficiently clean, smooth, or shape various surfaces.

Providing High-Pressure Air

The primary function of air compressors in sandblasting is to generate high-pressure air. This compressed air propels the abrasive media through the nozzle and onto the target surface. The pressure level required depends on factors such as the type of abrasive, nozzle size, and desired surface finish.

Ensuring Consistent Airflow

Consistent airflow is essential for achieving even results in sandblasting. Air compressors with sufficient tank capacity and CFM (cubic feet per minute) rating ensure a steady supply of compressed air. This prevents fluctuations in pressure that could lead to uneven abrasive distribution or incomplete surface treatment.

Controlling Abrasive Flow

Air compressors also help control the flow of abrasive media in sandblasting. By adjusting the air pressure and nozzle size, operators can regulate the amount of abrasive delivered to the surface. This level of control allows for precise and efficient use of abrasive media, reducing waste and improving overall results.

Environmental Considerations and Impact

Sandblasting can generate dust and debris that may harm the environment and human health. Air compressors equipped with appropriate filters and dust collection systems help minimize these risks. They capture airborne particles, preventing them from escaping into the surrounding area and ensuring a safer working environment.

Portability in Sandblasting Operations

Many sandblasting projects require on-site work, making portability a key consideration. Portable air compressors, either gas-powered or electric, allow for greater flexibility in sandblasting operations. They can be easily transported to different locations, enabling efficient work on various job sites.

Aspect Importance in Sandblasting High-Pressure Air Propels abrasive media for effective surface treatment Consistent Airflow Ensures even abrasive distribution and complete surface coverage Abrasive Flow Control Allows precise and efficient use of abrasive media Environmental Impact Minimizes dust and debris, promoting a safer work environment Portability Enables on-site work and flexibility in sandblasting operations

What is the Key Factors in Choosing an Air Compressor for Sandblasting

When selecting an air compressor for sandblasting, several key factors must be considered to ensure optimal performance and efficiency. These factors include CFM, PSI, nozzle size, tank size, portability, and power source.

CFM (Cubic Feet per Minute)

CFM refers to the volume of air that an air compressor can deliver in one minute. It is a crucial factor in sandblasting, as it determines the speed and effectiveness of the process.

What is CFM and why it matters

• CFM indicates the air volume delivered by the compressor

• Higher CFM means more air is available for sandblasting

• Insufficient CFM leads to slower work and inefficient abrasive use

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CFM requirements for different sandblasting needs

The CFM required for sandblasting varies depending on the project size and desired power:

• 10-20 CFM: Suitable for smaller projects and light-duty sandblasting

• 18-35 CFM: Ideal for more powerful sandblasting and medium-sized projects

• 50-100+ CFM: Necessary for industrial-scale sandblasting and large projects

PSI (Pounds per Square Inch)

PSI is a measure of the air pressure generated by the compressor. It plays a significant role in the speed and efficiency of the sandblasting process.

What is PSI and its significance

• PSI represents the force of the air delivered by the compressor

• Higher PSI means more powerful and faster sandblasting

• Insufficient PSI results in slower cleaning and reduced effectiveness

Ideal PSI range for sandblasting

• 90-100 PSI is the recommended range for most sandblasting applications

• Lower PSI may be suitable for delicate surfaces or precision work

• Higher PSI may be necessary for tough, stubborn materials

Impact of PSI on cleaning speed and efficiency

• Higher PSI allows for faster removal of contaminants and coatings

• Increased PSI can improve overall sandblasting efficiency

• Excessive PSI may damage delicate surfaces or cause unwanted abrasion

Nozzle Size

Nozzle size is another critical factor in sandblasting, as it affects the air pressure and volume requirements, as well as the blast pattern and coverage area.

How nozzle size affects air pressure and volume requirements

• Larger nozzles require higher CFM and PSI to maintain effective sandblasting

• Smaller nozzles can operate at lower CFM and PSI while still achieving desired results

Selecting the right nozzle size for your project

The choice of nozzle size depends on the specific requirements of your sandblasting project:

• #4 or #5 nozzles: Ideal for precise, smaller blast patterns and delicate surfaces

• #6 to #8 nozzles: Suitable for larger, more efficient blasting and faster coverage

Relationship between nozzle size, CFM, and PSI

• As nozzle size increases, the required CFM and PSI also increase

• Proper balance between nozzle size, CFM, and PSI is essential for optimal sandblasting performance

Nozzle Size CFM (at 90 PSI) Blast Pattern #4 81 Small, precise #5 137 Small, precise #6 196 Medium, efficient #7 254 Large, fast coverage #8 338 Large, fast coverage

Compressor Tank Size

The size of the air compressor tank is important for maintaining consistent air pressure and flow during sandblasting.

Importance of sufficient air tank capacity

• Larger tanks provide a more consistent air supply

• Sufficient tank capacity prevents frequent compressor cycling

• Consistent air pressure and flow lead to better sandblasting results

Recommended tank sizes for continuous sandblasting

• For small projects or intermittent use, a 20-30 gallon tank may suffice

• For continuous sandblasting or larger projects, a 60-80 gallon tank or larger is recommended

Portability and Power Source

The portability and power source of the air compressor should be considered based on the specific needs of your sandblasting project.

Stationary vs. portable air compressors

• Stationary compressors are suitable for workshop or factory settings

• Portable compressors offer flexibility for on-site or remote sandblasting jobs

Electric vs. gas-powered compressors

• Electric compressors are quieter and more environmentally friendly

• Gas-powered compressors provide mobility and independence from electrical outlets

Considerations for job site accessibility and power availability

• Evaluate the availability of electrical power at the job site

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• Consider the need for mobility and access to remote locations

• Choose the power source that best suits your sandblasting project requirements

Types of Air Compressors Suitable for Sandblasting

When choosing an air compressor for sandblasting, it's important to understand the different types available and their suitability for your specific needs. The three main types of air compressors commonly used in sandblasting are piston, rotary screw, and diesel compressors.

Piston Air Compressors

Piston air compressors, also known as reciprocating compressors, use pistons driven by a crankshaft to compress air. They are available in two configurations: single-stage and two-stage.

Single-stage vs. two-stage compressors

• Single-stage compressors have one piston that compresses air in a single step

• Two-stage compressors have two pistons that compress air in two steps, resulting in higher pressure output

You can get more information about Single-stage and Two-stage compressors.

Pros and cons for sandblasting use

Pros:

• Lower initial cost compared to other types

• Suitable for intermittent sandblasting tasks

• Easy maintenance and repair

Cons:

• Limited air volume output

• Higher noise levels

• Shorter lifespan under heavy use

Rotary Screw Air Compressors

Rotary screw air compressors use two meshed rotors to compress air continuously. They are known for their efficiency and high-volume output.

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How they work and their advantages

• Two helical screws rotate in opposite directions, trapping and compressing air between them

• Provides a constant flow of compressed air without pulsation

• Offers higher CFM output compared to piston compressors

• Operates at lower noise levels

• Longer lifespan and reduced maintenance requirements

Ideal for high-volume, continuous sandblasting

Rotary screw compressors are the preferred choice for demanding, continuous sandblasting applications due to their:

• Ability to deliver high volumes of compressed air consistently

• Efficient operation and energy savings

• Durability under heavy use

Diesel Air Compressors

Diesel air compressors are powered by diesel engines, making them suitable for remote job sites where electrical power may not be readily available.

Internal Structure of High Pressure Carrier Portable Diesel Screw Air Compressor   

Benefits of diesel-powered compressors for remote job sites

• Independence from electrical power sources

• Mobility and flexibility in remote locations

• High-power output for demanding sandblasting tasks

Fuel efficiency and runtime considerations

• Modern diesel compressors offer improved fuel efficiency

• Larger fuel tanks provide extended runtime between refills

• Proper maintenance ensures optimal performance and fuel economy

Type Pros Cons Piston - Lower initial cost
- Suitable for intermittent use
- Easy maintenance - Limited air volume
- Higher noise levels
- Shorter lifespan Rotary Screw - High CFM output
- Constant air flow
- Lower noise levels
- Longer lifespan - Higher initial cost
- More complex maintenance Diesel - Independence from power sources
- Mobility in remote locations
- High-power output - Fuel costs
- Emissions
- Regular maintenance required

Sizing Your Air Compressor for Sandblasting

Properly sizing your air compressor is crucial for efficient and effective sandblasting. An undersized compressor will lead to slower work and poor results, while an oversized one will be a waste of money and resources. Follow these steps to determine the right size air compressor for your sandblasting needs.

Calculating your CFM and PSI requirements

To calculate the CFM (Cubic Feet per Minute) and PSI (Pounds per Square Inch) you need, consider the following factors:

• The size of the sandblasting nozzle you'll be using

• The type of abrasive media

• The desired cleaning speed and efficiency

Refer to the manufacturer's specifications or consult with a professional to determine the CFM and PSI requirements for your specific setup.

Factoring in nozzle size and future needs

When sizing your air compressor, consider not only your current nozzle size but also any potential future upgrades. If you anticipate using larger nozzles or multiple nozzles simultaneously, choose a compressor with higher CFM and PSI ratings to accommodate those needs.

Allowing for compressor wear and performance loss over time

Air compressors, like any mechanical equipment, experience wear and tear over time. This can result in decreased performance and efficiency. To account for this, select a compressor with slightly higher CFM and PSI ratings than your minimum requirements. This will ensure that your compressor can still meet your needs even as it ages.

Choosing a compressor with 30-50% additional capacity

To ensure optimal performance and longevity, it's recommended to choose an air compressor with 30-50% more capacity than your calculated requirements. This additional capacity will:

• Compensate for any air leaks or pressure drops in the system

• Allow for longer continuous running times without overloading the compressor

• Provide a buffer for future growth or unexpected demands

For example, if your calculated CFM requirement is 20, consider purchasing a compressor with a CFM rating of 26-30.

Nozzle Size CFM Required at 90 PSI Recommended Compressor Size (CFM) #4 81 105-122 #5 137 178-206 #6 196 255-294 #7 254 330-381 #8 338 439-507

Additional Considerations

When choosing an air compressor for sandblasting, there are several additional factors to consider beyond just the technical specifications. These factors can greatly impact your overall experience, efficiency, and long-term satisfaction with your purchase.

Noise Levels and Operating Environment

The noise level of an air compressor can vary significantly depending on its type and size. Consider the following:

• Piston compressors tend to be louder than rotary screw compressors

• Larger compressors generally produce more noise than smaller ones

• If you're working in a residential area or noise-sensitive environment, opt for a quieter compressor or consider soundproofing measures

Additionally, think about the operating environment:

• Ensure proper ventilation to prevent overheating and maintain optimal performance

• Protect your compressor from dust, debris, and extreme temperatures

• Consider the space requirements for your chosen compressor size

Air Compressor Maintenance and Longevity

Regular maintenance is crucial for ensuring the longevity and reliable performance of your air compressor. Key maintenance tasks include:

• Checking and changing air filters

• Monitoring and topping off oil levels

• Inspecting and tightening belts and hoses

• Draining moisture from the tank regularly

Choose a compressor with easily accessible maintenance points and consider the availability of replacement parts. A well-maintained compressor will provide years of trouble-free service for your sandblasting needs.

Cost vs. Performance Tradeoffs

While it may be tempting to opt for the cheapest air compressor available, it's essential to consider the long-term cost and performance implications. A higher-quality compressor may have a higher upfront cost but can offer:

• Improved efficiency and faster project completion times

• Longer lifespan and reduced maintenance costs over time

• Better reliability and less downtime

Weigh the initial cost against the potential long-term savings and productivity gains when making your decision.

Renting vs. Buying an Air Compressor for Sandblasting

Depending on your sandblasting needs and frequency of use, you may consider renting instead of buying an air compressor. Renting can be a good option if you:

• Have infrequent or one-time sandblasting projects

• Want to test different compressor types before making a purchase

• Have limited storage space for a compressor when not in use

However, if you plan on using your compressor regularly or have ongoing sandblasting needs, buying may be more cost-effective in the long run.

Factor Buying Renting Frequency of use Regular, ongoing projects Infrequent or one-time use Upfront cost Higher initial investment Lower, per-project cost Long-term cost Lower, with proper maintenance Higher, with repeated rentals Customization Can choose exact specifications Limited to available rental options Maintenance Responsible for upkeep and repairs Handled by rental company Storage Requires dedicated space Only when in use

Conclusion

Choosing the right air compressor for sandblasting is crucial for achieving optimal results. Consider key factors such as CFM, PSI, nozzle size, tank size, portability, and power source. Proper sizing ensures efficient performance and prevents under or oversizing.

Additional factors like noise levels, maintenance, cost, and renting vs. buying should also be evaluated. Consult manufacturer specifications and professional guidance for your specific needs.

By understanding these factors and carefully selecting your compressor, you'll be well-equipped for successful sandblasting projects. Invest time in research to make an informed decision that meets your requirements and budget.

Aivyter offers reliable air compressors for your sandblasting needs. Our knowledgeable team can help you select the right model based on your requirements. Contact Aivyter today to discuss your project and find the perfect compressor solution.

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