OVERVIEW: This cast iron, recirculated water heat exchanger vessel from 1981 was exposed to inclement weather and experiencing fatigue cracking in some welds and localised corrosion on the tube bundle guides. The Epo-chem™ system will with provide long term protection in this environment.
INDUSTRY
ENVIRONMENT
Recirculated water
SUBSTRATE
Cast Iron
CHALLENGE
This heat exchanger vessel was manufactured in 1981 and installed shortly after. Fatigue cracking was found in some welds and localised corrosion was discovered on the tube bundle guides. The unit was exposed to inclement weather.
SOLUTION
We recommended coating with our moisture and surface tolerant epoxy RS 500P as a primer. Finishing with a top coat of RA 532, a glass-flake filled epoxy solvent-free system. This protective coating system will with provide long term protection in this environment.
SCOPE
Identify damaged areas and check existing specification thickness
Bristle blast damaged surface area
Solvent wipe and square off using masking tape
Application of RS 500P in one coat to a nominal DFT of 100µm
Application of RA 532 in one coat to a minimum DFT of 250µm
PRODUCTS
OUTCOME
Chemcote was able to carry out the repairs to the internals of the heat exchanger vessel within the strict time frame provided by the client. This application will provide at least 10 years of corrosion free service.
RELATED CASE STUDIES
Air Receiver Restoration for Long-Term Durability
Pitting corrosion near shaft landing After first abrasive blasting After 2nd Abrasive blast holes were found requiring composite reinforcement Filling void in difficult to reach
High Performing Replacement for 316L SS
On inspection flange corrosion Deep pitting on forged section Application of 1st coat Ready to be put into service for 25+ years of life OVERVIEW:
Power Station Debris Filter Lining Repair
Damage to existing rubber lining Internal void to be filled in around the circumference of the screen Close up of repair area for the full