OVERVIEW: Illustrated a sound understanding of the results required to refurbish and extend the life of heavily corroded equipment. Proven performance after 20 years of using “Chemco International” coatings.
Chemcote has provided long term protection on other strainers and their backwash covers within this power station.
INDUSTRY
ENVIRONMENT
Sea Water
SUBSTRATE
Austenitic iron body
CHALLENGE
Strainer has been in service for 30 + years. Inspection of the strainer body, back wash covers & critical dimensions found the substrate to be severely corroded, illustrated by the extent of graphitised iron, holes through the casting and diminishing wall thickness
SOLUTION
Composite materials were chosen to rebuild the metal loss. We then applied RB 364 series , a glass flake filled vinyl ester consolidated with composite reinforcing to return the casing to its original strength
SCOPE
Protect threaded holes using backing rod
Abrasive blast and treat to reduce metallic salts by hot washing and re-abrasive blast
Apply Chem-tect™ RB 364 in two coats where required to obtain minimum thickness of 1,000μm
Pitfill to reduce the sharp edges and pit depth allowing a smooth uniform coating to be applied
QA included spark testing and DFT to confirm coating integrity
Apply coat of RL 500 PF to externals
PRODUCTS
Chem-tect™ RB 364 Series – Glass Flake filled vinyl ester resin
Epo-Chem™ RL 500PF to externals
OUTCOME
After 15 years of Chemcote Coatings providing long term protection on other strainers and their backwash covers within the power station, Chemcote was enlisted for repairs to the 2 large Strainers to one of the main condenser units
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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
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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: