This photo and description is from: http://www.pacht.com/waterjetting/waterjetting.htm: (please check them out for other info on water blasting and cutting), it shows a basic rendering of what is going on with a pressure washer and a vacuum feed nozzle or head of a media blaster most of us will use. The media is being drawn into the water-stream then propelled out with the force needed to remove from the surface of the substrate we are blasting.
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|Cleaned by Pete hydro blasting set-up General pump BE older version.|
|Landa media blasting set-up Cleaned by Pete Springfield MO.|
|One of the power washers Cleaned by Pete use for the media or wet sand blasting in Southwest Missouri.|
|Medium grade of coal slag use to remove paint from this tractor grill, Cleaned by Pete Fairgrove Missouri, "wet media blasting".|
While I use power washers rated at 4 gallons at 4000 psi and a 4 gallon at 3200 for blasting I'm sure you could use a higher flow washer. The problem with higher flow washers is water usage 4 gallons has been sufficient for all the jobs I have undertaken thus far. Since I do mobile blasting at customers homes and locations water flow may be and issue (a well or out laying area many not keep up with much more them 4 gallons per minute). Yes all my "media blaster" units or washers are on wheels. Getting to some areas is just hard here in the Ozarks.
I have two power washing units that I use for blasting and their output is a close range I do use each of the wands or set-ups with both washers but they are matched to a machine. Most upper level systems or nozzles will be sized or ordered to fit your machine you intend to use it on. The one you asked about is a Landa brand wand, head, nozzle, lance and pick up tube they run around $650.00 to $750.00 dollars depending on the markup at a Landa dealer. I have seen the Shark brand available also it appears to be the same setup. The blasting nozzle is replaceable if needed. You asked about the other one it is a older model General Pump or BE that has been superseded by another one. I like this nozzle when using soda it seems to work well but also use the coal slag with it.
here is the the link to the closest thing to the old General I believe this would work for you. I know other dealer sell them too. Look to find one to fit your washer. The Landa / Shark kit use to be found on Amazon too. The Landa comes with a thumb control valve to increase and decrease the media flow on the side handle very easy to use.
Yes it is different the newer one have a media flow valve on them and I don't know how well it works. I have made a flow valve at the pick-up tube in the system I use. A bit of a hassle till you get the flow you want have to walk back to the bucket a couple of time the flow at the nozzle may save a few steps and some time I really don't know. I use about 25 to 30 feet of feed hose,
I have the two different units for different machines each is matched to the output of the pump. For the price if you were not going to serious about media blasting the General or BE style would be OK, Long term, easy to media flow adjustment and parts that will not be superseded I would say the Landa is the way to go. It is a bit heaver and I have had problems getting it in crevices where blasting is needed. The smaller head / nozzle of the General one was much easier to get into places, though the new style is bulkier too. I saw this one It is a little lighter I don't know who makes it but it may be OK to begin with due to the price. Again I do not know much about it since I'm not looking to replace anything yet so I can not recommend it but the overall design is very similar to my old one and has replaceable nozzles.
The silver tube looking thing as you called standing by the washer is my hopper it holds about 100 pounds of media. It is a gravity feed hopper (homemade by me) but soda does not like to flow to well in it maybe to skinny. I have to whack it a rubber mallet to keep the soda flowing down sand and slag work well since it weighs more. I use mostly a 5 gallon bucket with media in it now and throw a blue tarp over it when working to keep the water out. One tip I learned the hard way is to never let off the trigger unless you are point the tip down. I have had water back flow a bit and plug up the media flow. Stop and dry it out wet media does not flow and slows the job down. You can see I have buckets in the picture, I find them easier to use and keep the media in. It may look a bit more "unprofessional" but it works better for me.
|Cleaned by Pete media blasting Battlefield MO.|
These are a few of the questions I have answered I only posted my answers since I did not get permission to post the questions from the people who asked them. Posting other texts, emails and communications is just bad taste in my opinion. you can under stand what was being talked about and that is all that is needed in this case. I have not told you how to do it that is up to you each unit will react somewhat different you will have to develop your own technique and style of doing this, type of work. I was asked by one of the power washing groups if I would help by teaching a class on "media blasting" it looks like a growing field and I just may do it at one of the conventions if there is interest in it. I hope you find this blog entry answering some of your questions about this add-on service to your business. I'm still available for questions.
|Soda blasting Springfield MO, Cleaned by Pete.|
|Cleaned by Pete soda blasting a Honda Motor for a "cafe racer project.|
|Soda blasting BMW wheel centers for a restoration Cleaned by Pete.|
This entry will be ever growing as I add questions and information to it.