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022 Water Usage in the Dana-Ridge wetblast process

How much water
does a Dana-Ridge
wetblast machine consume?

A lot less than you think!

The Dana-Ridge wetblast units recirculate water and abrasive around and around. There is however, some water used to lubricate the wiper blade on the viewing window and also when using the rinse gun to rinse off any remaining media after blasting.

The extra water that this adds to the process causes the water level inside the machine to rise and therefore dribble out the overflow at a similar rate. The overflow is on the side of the sump on the smaller machines and at the back on larger units. As the water dribbles out, it will take with it any overly worn media and any material you are blasting off such as paint, oils etc.

The water that is used to wet the viewing window is controlled via a wash valve located on the front of the machine. It is best to minimise the amount of water used to lubricate the window wiper. Enough to wet the screen is sufficient. If the spray valve is opened too much, it can lead to excessive consumption of both water and media as it allows more media to get washed out the overflow than is necessary.

Water consumption was measured to be around 24L PER BLASTING HOUR (as a rough guide), unless you use the optional closed-loop/recirculation tank system, in which the water consumption is almost zero!

The closed loop system:

  1. allows worn media, oils and surface material to be separated out for easy disposal later.
  2. reduces water consumption to near zero.
  3. allows additives such as ‘No Rust’ to remain in-process without being diluted over time and needing replenishment
  4. allows the machine to be placed remote from mains water services other than for the initial fill and top-ups over time due to atmospheric evaporation
  5. allows machine to placed remote to drainage services
  6. is environmentally friendly

Water consumption can be further reduced by using a ‘dunk tank’. Basically, position an appropriately sized tank or bucket of water near your machine, dose it up with ‘NO RUST’ (if required) and use it to rinse off the blasted components when you are finished. This has the benefit of

  1. more thoroughly rinsing the abrasive from the finished piece
  2. allowing a higher dosage rate of ‘No Rust’ as the water is not being constantly agitated as it is inside the blast machine
  3. additives such as ‘No Rust’ do not get diluted through constant addition of fresh water.

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Once you have one of these machines, you'll wonder how you ever got along without it!