Tag Archives: cleanliness

Why is steel dull gray after Waterjetting? What does the profile look like under rust?

Posted on 31. Jul, 2017 by .

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This is a monograph on why steel looks dull  gray after waterjet cleaning.  What does the profile look like under rust? The simple answer is that abrasives leave debris behind which reflects back the light; abrasives plow the surface and create plateaus. Water jet cleaning (Hydroblasting) removes the debris and doesn’t form flat surfaces. Grey […]

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Comparison of Wet Abrasive Blast (WAB) and Dry Abrasive Blast Cleaning

Posted on 04. Feb, 2016 by .

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There are many methods of wet abrasive blast cleaning (WAB) in surface preparation to remove coatings. Since the 1980’s, Carolina Equipment and Supply Co. (CESCO) has been supplying WAB equipment along with recycling methods. Recently CESCO sent me two youtubes to directly compare traditional dry abrasive blast cleaning and Wet Abrasive Blast Cleaning using their […]

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Pressure Sensitive Tape Test for Quantity of Flash Rust

Posted on 16. Mar, 2009 by .

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Pressure Sensitive Tape Test- for Quantity of Flash Rust- NSRP Project The Pressure Sensitive Tape Test described by Hempel is a modification of ISO 8502-3 (Pressure Sensitive Tape test for dust) and is not mentioned in VIS-4.  The tape test can be used as a permanent record.  If lint deposition is a concern, the project […]

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Summary of Major Points- Flash Rust Project NSRP

Summary of Major Points- Flash Rust Project NSRP

Posted on 16. Mar, 2009 by .

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NSRP Flash Rust Project Metric Table, Control of Amount Summary of Major Points: 1.    Flash Rust is the rust that occurs from the time the waterjetting process starts to the time the water used for the waterjetting process dries. 2.    Control the quantity of Flash Rust by Project Planning           • During Removal Process           • As Water is drying […]

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Example of Heavy Flash Rust Swatch

Posted on 15. Mar, 2009 by .

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Example of Moderate Flash Rust Swatch:  Easy to prepare the swatches.  Keeps a constant light pressure.  Gives a clear distinction between light, moderate, and heavy.  The color transfers to only the cloth that is in contact with the surface. It can be difficult to interpret the various spots of color.

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Wipe or Sweep with Cloth Held in Hand

Posted on 15. Mar, 2009 by .

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Wipe or Sweep with a Cloth held in a hand  Make a bundle of cloth in your hand.  Swipe the dry cloth across the surface.  Make one swipe, up or down or sideways with the cloth touching the surface.  Try to avoid pressing the fingers against the surface. The following four pictures are examples of […]

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VIS Guides for Visual Cleanliness

Posted on 15. Mar, 2009 by .

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Use of VIS Guides for Visual Cleanliness       Immediately after the cleaning, before the surface has flash rusted, (it might still be wet), evaluate the degree of Visual Cleaning. The visual cleaning evaluation often occurs while the surface is still wet. A section was cleaned with hand-held lances over a period of 3 days.  Then […]

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