I did some research
I want to make my own wet blaster, so I did some research to find out what parts I need.
It’s called a Vapor Blaster in the US, I guess.
Necessary discharge volume
According to Vapor Horning Technologies, Inc., a nozzle with a 10mm inner diameter needs to be able to cover 20CFM = 566L/Min to maintain 50-60psi.
For personal use in the garage, a 5 horsepower air compressor is recommended. It can be roughly calculated as about 3-4 CFM per horsepower.
Nozzle diameter and required size of air compressor
By reducing the nozzle diameter, a smaller air compressor can be used.
| Nozzle diameter | Nozzle cross-sectional area | Ratio | Discharge volume | Size |
|---|---|---|---|---|
| 10mm | 25π㎟ | 100% | 20.0CFM / 566LM | 5HP |
| 8mm | 16π㎟ | 64% | 12.8CFM / 362LM | 3HP |
| 6mm | 9π㎟ | 36% | 7.2CFM / 204LM | 2HP |
Basic Setup
Minimum required parts
- Blaster gun
- Air cock
- Air compressor 2HP or more
- Water pump 1.5HP or more
- Bottom bucket
- Media (abrasives, alumina, glass beads, etc.)
- Pressure-resistant hose
For the time being, I’ll use a clothing case or something for the blaster cabinet.
The water pump is about 1.5 horsepower, 1100w.
Bonus
The output of the air compressor required for air tools is
- Nailer 2CFM
- Impact wrench 3/8 3CFM
- Impact wrench 1/2 4cFM
The output of the air compressor required for painting is
- 12CFM 70PSI
I want an air compressor with about 3HP.
Oil-free is suitable for painting, but it has a small number of bulbs and is quite expensive.
I’ll try 2HP for now