Tag Archives: Field Tests
Why is steel dull gray after Waterjetting? What does the profile look like under rust?
Posted on 31. Jul, 2017 by Lydia Frenzel.
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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Summary of Major Points- Flash Rust Project NSRP
Posted on 16. Mar, 2009 by charles frenzel.
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 Pressure Wash on Moderate Flash Rust
Posted on 16. Mar, 2009 by charles frenzel.
Example of Pressure Wash on MFR: Below: the substrate is dry- but it is darker (overall) than the original substrate. This surface is dry within 5 minutes. The standard pictures in VIS-4 do not provide these types of illustrations of pressure-washed surfaces. The upper half is not washed; the lower half has been pressure washed. […]
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Pressure Washing and Excess Flash Rust
Posted on 16. Mar, 2009 by charles frenzel.
What Happens if there is too much Flash Rust prior to painting? Prior to the application of paint, the substrate must meet the procurement specifications. Typical field remediation includes: Pressure washing Broom brushing Blowing off with pressurized air Solvent cloth or dry cloth wiping Vacuum Upon polling contractors, it appears that pressure washing is the […]
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Summary of Brush Test
Posted on 15. Mar, 2009 by charles frenzel.
Summary- Brush Test: Brushing flash rust is quick, simple, and very reproducible. Adopt a standard brush and standard cloth. Be consistent with one swipe and in the same direction and duration. Practice brush strokes with even pressure Keep the contact area consistent. Cloth can be cut at the area of color transfer and placed in […]
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Example of Brush Test on Light Flash Rust
Posted on 15. Mar, 2009 by charles frenzel.
Example of Brush Test on Light Flash Rust: This view has the sun Illuminating the surface. Substrate appears darker as it is in shadow. Inspection is biased by lighting angle.
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Brush Wipe Procedure
Posted on 15. Mar, 2009 by charles frenzel.
Brush Wipe Procedure This method was developed by Todd Pacific Shipyard. These photos are courtesy of Todd Pacific. Sweep the surface with a Cloth wrapped around a brush Standard cloth and standard brush. Wrap cloth around a paint brush. Swipe the cloth across the surface. Define the amount of pressure • Brush as if painting a […]
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Example of Heavy Flash Rust Swatch
Posted on 15. Mar, 2009 by charles frenzel.
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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Example of Moderate Flash Rust Swatch
Posted on 15. Mar, 2009 by charles frenzel.
Example of Moderate Flash Rust Swatch:
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Wipe or Sweep with Cloth Held in Hand
Posted on 15. Mar, 2009 by charles frenzel.
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 […]
