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Corrosion Protection For Hot Salt Water

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Corrosion Protection For Hot Salt Water

Industry:

Power Generation

Date:

2016

Substrate:

New fabrication using mild steel

Products:

Chem-tect™ RB 300 series

Epo-chem™ RL 500PF

RC 500GTC finish coat

Environment:

Hot salt water

Challenge:

The project was a series of pipe spools with diverse configurations and diameters. These items required long term corrosion protection against high temperature salt water. This would be classified as an extremely corrosive environment. For this reason they demanded a superior coating system. The complex schematics and pipe diameters made it challenging to coat internally. Field fitting of flanges was required to ensure the completed spools lined up.

Pipe spools with challenging configurations
Pipe spools with challenging configurations
Applying RB 300 to the internals of a pipe the only way possible
Applying RB 300 to the internals of a pipe the only way possible

Chemcote’s Solution:

Chemcote’s solution was to apply Chem-tect™ RB 300 series to the internals of the pipework. This coating is a glassflake filled vinyl ester. Glassflake filled coatings have proven to be the most suitable where good corrosion resistance and excellent mechanical properties are required.

Scope:

Internal Corrosion Protection

We started by grinding welds and sharp edges prior to abrasive blasting.

We then abrasive blasted to class AS 1627.4 – Class SA 3.0.

Followed by an application of Chem-tect™ RB 300 series in 2 coats to acheive a total DFT of 1000um.

DFT tests were then carried out to confirm coating the thickness.

Finally we carried out high voltage test at 8,000 volts to identify and rectify defects.

Holiday testing RB 300 internal coating
Holiday testing RB 300 internal coating

External Corrosion Protection

The primer applied was 2 coats of Epo-chem™ RL 500PF.

The finish coat applied 2 coats of Chemco RC 500GTC.

Results:

The majority of work was conducted in our purpose built workshop. The finishing touches were carried out onsite once the field fitted flanges were complete. The asset owner was extremely pleased with the quality, turnaround time and communication throughout this project. The coating will exceed the life requirements of 25 years and reduce maintenance costs in the future.

Finished elbow showing face prepared to prevent crevice corrosion
A finished elbow showing the face prepared to prevent crevice corrosion