OVERVIEW: A series of pipe spools with diverse configurations and diameters required long term corrosion protection against high temperature salt water. The coating will exceed the life requirements of 25 years and reduce maintenance costs in the future.
INDUSTRY
ENVIRONMENT
Hot Salt Water
SUBSTRATE
New fabrication using mild steel
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.
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
External Corrosion Protection
The primer applied was 2 coats of Epo-chem™ RL 500PF
The finish coat applied 2 coats of Chemco RC 500GTC
OUTCOME
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.
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