Hydrodemolition methods

How to choose the correct equipment


To perform the very best Hydrodemolition operation, you have to take in to consideration what type of Hydrodemolition method that is most applicable. No matter if you have a preset deepth of concrete needed to be removed, a surface to be prepared for a new coat of material or if there’s need of rust removal – there’s always a solution with Hydrodemolition. It all comes down to the pressure and flow of the water.

Pressure vs Flow

In short, when you use ultrahigh pressure and low flow you get a sharper and more precise cut. But when you have low pressure and high flow of water you get a selective removal, where only the bad concrete is removed and all good concrete is left intact. By changing the pressure and flow, and by using the correct equipment, you’ll get the job done both faster and better.

Make the right choice

All Power Pack´s have specific pressure and flow. To choose from example 100 l/min to 212 l/min is not possible without doing alteration on your Power Pack, piston head and pistons and hoses etc has to be changed and the unit has to be re-calibrated with the new technical data. We therefore recommend choosing a unit which covers most of the tasks that you are planning to do.

You can never take out more than rated pressure and flow but you can provide less by changing RPM and size of nozzle.

 



hydrodemolition aquajet systems aqua cutter selective removalSelective removal

Selective removal is one of the basic principles of Hydrodemolition. It means that you only remove the amount of concrete needed for the refurbishment.

By using a lower water pressure (typically 1000 bar / 14 500 psi) the effect on the concrete will be selective. The sides and the bottom of the cut will be a little rough since it follows the quality of the concrete. The concrete will be removed where the quality is poor. The good concrete will be left undamaged.

Robotic process:
1000-1400 bar / 14 500-20 300 psi
180 – 264 l / 48-70 gal of water

Recommendation:
Aqua Cutter 410 / Power Pack 400
Aqua Cutter 710 / Power Pack 700


145 l/min @ 1100 bar
212 l/min @ 1290 bar


superior method hydrodemolition aquajet systems


hydrodemolition aquajet systems aqua cutter controlled depth removalControlled depth removal / Hydromilling

Controlled depth removal means that you use higher water pressure (2500 bar/36259 psi), that will have a more cutting effect on the concrete.

The result will be more even both on the sides and the bottom of the cut. It will remove all that is set in the control system, regardless of the concrete quality.

Robotic process:
1500 – 3000 bar / 21 800 – 43 500 psi
38 – 130 l / 10-35 gal of water

Recommendation:

ERGO GO/Power Pack 270      
Aqua Cutter 410/Power Pack 400
Aqua Cutter 710/Power Pack 700
Aqua Cutter 410+710/Power Pack 270


40 l/min @ 2800 bar
62 l/min @ 2600 bar 
100 l/min @ 2550 bar
40 l/min @ 2800 bar


hydrodemolition aquajet systems aqua cutter surface


hydrodemolition aquajet systems aqua cutter scarifying and surface preparationScarifying and surface preparation

To make a god bounding on a surface for the new material you need to roughen up the old surface. If you want to make a good bounding surface but at the same time remove as little material as possible, the most effective way to do that is to use a rotolance. The Rotolance tool will produce precise and fast removal of a shallow concrete layer. And will leave a superior rough bonding surface, for a new coating. This is also the best and most efficient way to roughen a slippery concrete surface.

Robotic process:
1000 – 3000 bar / 14 500-43 500 psi
38 – 264 liters / 10-70 gal of water

Recommendation:
ERGO GO/Power Pack 270 
Aqua Cutter 410 / Rotolance 2500 / Power Pack 270
Aqua Cutter 710 / Rotolance 1000 / Power Pack 700
Aqua Cutter 710 / Rotolance 2500 / Power Pack 700


40 l/min @ 2800 bar
40 l/min @ 2800 bar
212 l/min @ 1290 bar
100 l/min @ 2550 bar


superior method hydrodemolition aquajet systems surface


hydrodemolition aquajet systems aqua cutter rust and paint removalRust and paint removal

High-pressure water can also be used to remove paint or rust, avoiding use of grid blasting. This means no dust pollution, no contaminated sand to dispose of, just a clean steel surface left after removal. Rubber coatings or rubber on, for example, airplane runways from the tires can also be removed.

Robotic process:
1000 – 3000 bar / 14 500-43 500 psi
38 – 264 liters / 10-70 gal of water

Recommendation:
ERGO GO/Power Pack 270
Aqua Cutter 410 / Rotolance 2500 / Power Pack 270
Aqua Cutter 710 / Rotolance 1000 / Power Pack 700
Aqua Cutter 710 / Rotolance 2500 / Power Pack 700


40 l/min @ 2800 bar
40 l/min @ 2800 bar
212 l/min @ 1290 bar
100 l/min @ 2550 bar


hydrodemolition aquajet systems surface aqua cutter


hydrodemolition aquajet systems aqua cutter industrial cleaningIndustrial cleaning

Traditional industrial cleaning has historically been carried out by handheld tools. This is a very dangerous operation and something that could be avoided by the use of robotic cleaning. More and more contractors are switching from manual to automated cleaning, increasing both safety and efficiency.

Robotic process:
1000 – 3000 bar / 14 500-43 500 psi
38 – 264 liters / 10-70 gal of water

Recommendation:
ERGO GO/Power Pack 270
Aqua Cutter 410 / Rotolance 2500 / Power Pack 270
Aqua Cutter 710 / Rotolance 1000 / Power Pack 700
Aqua Cutter 710 / Rotolance 2500 / Power Pack 700


40 l/min @ 2800 bar
40 l/min @ 2800 bar
212 l/min @ 1290 bar
100 l/min @ 2550 bar


hydrodemolition methods industrial cleaning aquajet systems surface