Acknowledgements
Many people contributed to this module. The technical team members include:
National Shipbuilding Research Program SP-3 Panel, Todd Pacific Shipyard, Detyens Shipyard, Atlantic Marine Florida LLC, Carolina Equipment and Supply Co. (CESCO), UHP Projects, and NLB Corporation. My appologies if I missed someone.
There are many other factors of inspection of the substrate when wet abrasive or [...]
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Pressure Sensitive Tape Test- for Quantity
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 specification may require use of a [...]
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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 Wipe, Swatch, and Brush Methods
Posted on 15. Mar, 2009 by charles frenzel.
Core Idea: All Methods lead to the same conclusion.
None
Light
Moderate
Heavy
Adopt the method with which you feel most comfortable and that is portable to different projects and sites.
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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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Different Areas with Brush Test
Posted on 15. Mar, 2009 by charles frenzel.
Comparative results:
Heavy Flash Rust formed from water coming from holes.
Different section where Light, moderate, and heavy flash rust had formed in close proximity.
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Example of Moderate Flash Rust on Brush
Posted on 15. Mar, 2009 by charles frenzel.
Example of Moderate Flash Rust on Brush:
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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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Water Jetting Video
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