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Pressure Blast Machine-Wetblast
Product Description:
A wet blast machine — also sold as a wet sandblasting machine, a vapour blasting machine or a wetblast unit — is a pressure-pot system that carries abrasive to the nozzle in a water slurry instead of in dry air. Water and abrasive are charged into the same vessel and pushed out under compressed air; because each particle travels inside a film of water, the blast stream releases no airborne dust into the working area and generates no sparks.
The water film also cushions each impact: rust, mill scale and old coatings come off without the part being heated or distorted, and the finish is uniform satin rather than directional. In mixed shops the wet pass usually follows a coarser media blasting pass. Surface roughness is set by blast media grade, pressure and stand-off distance, so we confirm the Ra target with a sample blast on your workpiece before shipment.
How a Wet Blast Machine Works
Abrasive and water are loaded into the vessel through the top opening and form a slurry at the bottom cone. Compressed air pressurises the vessel and drives the slurry through the abrasive valve and the blast hose to a hand-held nozzle. At the nozzle the slurry accelerates and strikes the workpiece; the water film collapses on impact, keeps the abrasive in suspension and suppresses dust at the point of generation. Because the dust never becomes airborne, the machine holds workplace dust emission limits without a dust collector or extraction ducting. Spent slurry drains into a sump, where the solids settle and the water is returned to the circuit.
Model | WP400 | WP500 | WP600 | WP700 | WP800 | WP900 |
Overall Dimensions | 420*1150 | 520*1200 | 620*1350 | 720*1400 | 820*1530 | 920*1800 |
Diameter | 420 | 520 | 620 | 720 | 820 | 920 |
Wall Thickness | 5 | 5 | 6 | 6 | 6 | 8 |
Internal Volume | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.9 |
Air Compressor Requirement | 15kw | 15kw | 22kw | 22kw | 37kw | 37kw |
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Product Description
Applications
Rust removal. Light surface rust lifts off machined and ground faces without touching the underlying tolerance, which is why the process is used on bearing seats and sealing faces rather than on structural steel.
Mill scale removal. Heat-treatment and hot-rolling scale comes off without adding more heat to the part. Thick scale is slower than dry blasting, but thin sections do not have to be straightened afterwards.
Deburring. Burrs on die-cast and machined edges are rounded uniformly, and because the water carries the fines away, no abrasive dust settles back onto the part.
Satin finishing. A non-directional, even satin is produced before anodising or passivation, with no scratch pattern left to show through the coating.
Mould cleaning. Vent slots, parting lines and textured cavities are cleaned without abrasive embedding in the tool steel.
Surface preparation before coating. The finish gives a uniform key across the face, without the profile variation a dry nozzle leaves when the section is thin.
Core Features
No airborne dust. Suppression happens at the nozzle instead of downstream, so there is no dust collector to size, no ducting to run, and no filter cartridges to replace.
No sparks, no heat. Usable in flammable and explosive atmospheres, and on parts that cannot be allowed to reach elevated temperature.
No workpiece distortion. The water cushion spreads the impact over the surface, so thin-wall sections and heat-treated parts hold their tolerance and come out free of abrasive embedment.
Uniform satin finish. Single-pass, non-directional and consistent across the face — good enough to serve as the final cosmetic step rather than only a preparation step.
Low abrasive consumption. Water and media are recovered and returned to the circuit, so abrasive consumption runs at a fraction of open dry blasting and the spent volume needing disposal is small.
Few wear parts. No turbine, no conveyor, no filter cartridges; the wear parts are the blast nozzle and the abrasive valve, both standard items held in stock.
Simple to run and maintain. One operator, a compressed air supply and a water supply are the whole installation requirement.
Technical Specifications
Q: Can a wet blast machine remove rust and mill scale?
A: Yes, but more slowly than dry blasting at the same pressure. Wet blasting is chosen where surface integrity matters more than removal rate. For heavy mill scale on structural steel, a dry pressure blast machine or a shot blasting machine is the correct tool.
Q: Can a wet blast machine remove rust and mill scale?
A: Yes, but it is slower than dry blasting at the same pressure. Wet blasting is chosen where surface integrity matters more than removal rate. For heavy mill scale on structural steel, a dry pressure blast machine or a shot blasting machine is the correct tool.
Q: Can I use steel shot or steel grit in a wet blast machine?
A: No. Carbon steel abrasive corrodes in a water circuit and the slurry loses its cutting ability within a short time. Wet blasting uses non-metallic media — glass bead, aluminium oxide or silicon carbide.
Q: Does wet blasting cause flash rust?
A: It can. A blasted surface is chemically active and stays wet, so ferrous parts will flash rust within hours unless they are dried promptly, treated with a rust inhibitor in the water, or moved straight into the next process step. We supply the inhibitor recommendation with the machine.
Q: What air compressor do I need?
A: 15 kW for WP400 and WP500, 22 kW for WP600 and WP700, 37 kW for WP800 and WP900. A smaller compressor will run the machine but will not hold working pressure at the nozzle, and finish quality will drop accordingly.
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