Tag Archives: Field Tests
Summary of Major Points
Posted on 16. Mar, 2009 by charles frenzel.
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
• Keep the drying time to a minimum.
3. Remove excess loose Flash Rust prior [...]
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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.
Brush test on [...]
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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 preferred practice. The appearance after pressure washing when [...]
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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 permanent file or scanned for color.
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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 door
Define the amount of contact- single [...]
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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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Field Tests for Quantification
Posted on 15. Mar, 2009 by charles frenzel.
Field Tests to Evaluate the Quantity of Flash Rust
The wipe and tape tests are subjective and require interpretation by the inspector. The interpretation can be difficult at first, but become simple with practice.
Look at the FLASH RUST
Assess the volume by observation
Wipe and/or Tape
Three Methods of Wiping
• Hand Wipe with a cloth
• Brush Wipe with a cloth
• Swatch with [...]
