Flash Rust » summary

Summary of Major Points

charles frenzel — Mon, 16 Mar 2009 19:32:56 +0000

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 to Painting

4. Based on the subjective methods, Flash Rust is classified as
           • None
           • Light
           • Moderate
           • Heavy

The following metric table was developed by Pete Ault, Elzly Technology Corporation. Click Table to enlarge.

Table of Metrics used in Flash Rust

ALL of the VISUAL GUIDES are used in the SAME WAY!
 Look at the flash rust
• straight on,
• within arm’s length,
• in good lighting,
• prior to painting.
 Allow time to remove, if necessary, excess loose flash rust prior to painting

Look at the surface and decide if you can see through the rust or if it obscures the surface. Make sure that the rust is not splotchy black.

Look at the color. Color can vary depending on the type of steel. The color is affected by the age and type of steel and, in the field, certainly might appear differently than the descriptive terms. Current language being adopted by NACE and SSPC will remove the COLOR language.

Determine Quantity of loose rust dust. Lightly wipe the surface with a cloth.

The methods to evaluate Flash Rust are Subjective.
• Visual Appearance and
• Assessment of amount of Loose Dust
 Cloth Wipe in hand
 Cloth Swatch in hand
 Cloth around a Brush
 Tape

Summary of Wipe, Swatch, and Brush Methods

charles frenzel — Mon, 16 Mar 2009 00:16:39 +0000

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.

Examples of LFR on Swatch, wipe, and Brush

Example of MFR on swatch and brush wipe.

HFR on Swatch

HFR on Brush Wipe

HFR with Swatch, Brush, and Wipe

Summary of Brush Test

charles frenzel — Mon, 16 Mar 2009 00:02:07 +0000

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.

Summary of Hand Wipe

charles frenzel — Sun, 15 Mar 2009 18:31:11 +0000

Summary- Hand Wipe

 Advantage of holding cloth in hand and wiping. It is easy.
 Disadvantage – it is difficult to maintain an even pressure and keep the cloth on the surface.