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An introduction to an abrasive blasting machine

BlastOne’s Master Technician, Kerry Cooper, provides an introduction to abrasive blasting machines


So, these vessels are used for different types of abrasive. For this particular one, we’ve got a product called speed blast and basically, what we do is we have a leading screen.

So, the lid is designed to keep the moisture from the pot and the screen is designed to stop foreign matter entering the blast pot itself.

So, you’ll procreate that, even with things like paper pieces of wood, and if you recycle your garnet, it’s imperative that foreign matter doesn’t enter the blast pot because it is a pressure vessel and it can cause it hearing problems with its operation.

So, to fill the blast pot, we do it without any pressure on the vessel of course. And the garnet quite easily falls in the conical section the pot to fill the pot and appropriate the blasting procedure.

Once doing that, we replace the pot and of course, we fill the pot until it’s that reason, for the blast pot itself is a piece of equipment to remove coatings corrosion and any other foreign matter that’s required as far as the specification is concerned or as far as the substrate is concerned, prior to obviously painting is the most imperative aspect of what we’re looking to do as far as the equipment is concerned.

What do we require, we’ll, we’ve got a blast pot. So, we need the safety equipment as well, which is a blast helmet, breathing air, and the breathing air filter, a compressor to drive the blast pot, the blast hose, and what we call twin lines or Deadman control hoses.

So, this we have two different types of pots. HERE, we have a self-exhausting POT, which is only pressurized when you operate the deadman, which is operated with these twin lines.

This particular pot here holds its pressure all the time. What’s the difference? Well, this particular unit here, predominantly, they’re pneumatic. So, air will facilitate the air in the pot, pressurize it, and send the garnet and the air down to you.

This particular pot here that has a pressurized pot. So, when you operate the Deadman, it’s somewhat more responsive and the grits there when you operate the Deadman, immediately you open that nozzle. The two sizes, of course, is indicative 23.5, 6.5. You can get larger pots and you can get smaller pots than that again so it depends on what the requirement is in relation to what sort of equipment you choose so the important thing to remember before setting up for blasting is the safety aspect of it how do I maintain my own personal safety and the surrounding of the other people with me to set up the compressor it’s important you make the compressor level on-site and do all your checks the mandatory checks as far as oils and so forth make sure that you appropriate your hoses in a manner with large radiuses also to utilize a whip checks and safety pins which will show as we go through this video and put this equipment together with the important thing about breathing air when blasting is that you must appropriate the compressor in such a manner that it
cannot breathe its own exhaust fumes so what I mean by that is that make sure that it’s in a wide-open environment so that the exhaust streams can’t be drawn back into the compressor and sent down the line to you we do have equipment that alarms us as far as co2 is concerned and I would strongly suggest that if you’re in an environment where you are concerned about exhaust fumes I would implore you to utilize co2 monitors to alert the operator if there is any dangerous fire at co2 exhaust fumes are concerned the equipment itself is relatively simple but at the same time you have to make sure that you have all the appropriate equipment to do the job properly in saying that we have different size blast hoses different size blast nozzles different types of media as I suggested earlier and also to the media is designed to do a certain job so it’s important to you select the appropriate media for the appropriate outcome as far as the pots are concerned you can see where they have what we call a hand hole in the front of them, that’s predominantly for inspection, why would we inspect the pot well because it’s a pressure vessel there is a requirement for periodic inspection and also to on the blast pots they’ll always be a product identification tag on there for a registration information primarily because it’s a pressure vessel it has to be inspected periodically and that’s why we give you the opportunity to be able to open these pots and inspect the internal wall integral strength of the pot to ensure that hasn’t been undermined by corrosion a compressor without an aftercooler or interruption to the line to enable the air to be dried so a compressor ultimately will send water through the air line and into a blast pot, so the problem is with that, is that
it impedes the flow of the grit or the garnet through the valve the appropriating valve for the metering valve to send the grit through to you so you get a consolidation of garnet and moisture which impedes the operation of the pot the other problem is we look with moisture is that it will end up ultimately coming out the end of your blast nozzle and onto the substrate that you’re trying to achieve a class of blast so that moisture is a contaminant immediately so to do this appropriately what we do is we’ll intercept the main air line the bull hose with an aftercooler or what we call an air prep the air prep facilitates appropriate dry air prior to entering that blasted pot so it’s impaired that when you utilize these pressure vessels there is no moisture in the air and the pot can run without continual adjustment of the valve itself so the valve on the bottom of these pots meters the amount of grit you have come through so with moisture mixed with the garnet it can impede the flow of the grit to the bottom of this conical section of the pot can also inherently having a detrimental effect on how the meter the media is metered as it flows through the blast hose itself so ultimately be gone back and forth back and forth altering the amount of grit that’s coming through to accommodate the moisture that is impeding the flow of the garden itself so all of those facts have a detrimental outcome in relation to what you’re trying to achieve

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