bill3752
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Posts posted by bill3752
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Pressure drop at 4.5 gpm through 3/8 tubing is 100 psi per 100 feet. It makes good sense that you are seeing a significant loss in flow rate.
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Ryan, regarding corrosion, pick a pump without a screw in the path of the fluid, and use seals appropriate for the material being pumped - EPDM, but more probably viton.
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I cover outlet, and over top of fixture with duct tape - if there is not a good seal, the water can work behind the fixture. Also ask to turn off breakers.
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If you have experience with muratic acid, mix some 28% acid 10/1 and brush on, or mix 5/1 and X jet on. Be sure to pre-rinse all areas surface to be cleaned, as well as the surface itself.
As a standard practice, I like to brush over a small spot to test the removal effeciency before going hog wild.
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Back to the original problem, I assume that you diluted the acid(s) by adding the acid to to water, not the other way around. The heat of dilution will cause a marked increase in temp, which can vaporize the acid. Putting water in your bucket first will provide a heat sink.
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Paul, thanks for the input. Went to house today to test some spots. No significant affect in color.
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Will be using D600 to clean brick on a new home. Trim appears to be cedar, and there a couple of spots of cedar shake siding. Aleady been stained. Will D600 affect the cedar?
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search an earlier post by Paul B on this subject (a few weeks ago). He provided some good info.
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I recommend the Diedrich products. Jim D is a great resource.
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You also need to give material of construction due consideration. If you are planning on running strong acids through your pump, get a pump without a screw in the fluid path, and get viton o rings. These cost a tad more than the version you quoted, and specs are limited ( I believe max flow is 1.6 gpm).
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Paul, can't see the picture, but I assume the keystones are smooth Indiana limestone? If so, we sometimes sand the keystones using 50 grit sand paper, which is the grade used in finishing the stones at the manufacturer. Our normal process is the scrape off the big junks, hit with brick cleaner to pull out as much dye as possible, then sand. We either hand sand, or use an orbital.
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Ron, what is this stuff? A cleaner?
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We clean a ton of brick, and we routinely run into the types of problems you have described. My best people are ones that work well with other subs, so that they can work around each other. Our most frequent problem is water supply. Good luck.
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Paul, thanks for the info. I am guessing that we could only get 16-17 cents per sq ft. I can't make enough at that price. I am thinking that pricing across the board is much lower here in Ky, compared to yours in Ohio. Also, you are correct about the women being very good at this type of work.
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Cleaning fixtures (including ceiling fans, etc.) tend to take some time.
Paul, what would you normally charge for this type of cleaning - i.e. how many cents per sq ft?
Acryllic
in Wood Cleaning & Restoration - Decks, Fences, etc.
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You think you may need solvent to get this off (i.e. paint stripper)? I have ended up walking away from a lot of these paint on deck jobs because of this.