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Refurbishment of J Strainer using Vinyl Ester – RB 300

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Refurbishment of J Strainer using Vinyl Ester – RB 300

Industry:

Power Generation

Date:

July 2019

Substrate:

Austenitic iron body

Products:

Chem-tect™ RB 364 Series – Glass Flake filled vinyl ester resin
Epo-chem™ RL 500PF to externals

Environment:

Sea Water

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

Chemcote’s 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

Vinyl Ester
On Arrival
Vinyl Ester
Surface Preparation on Arrival
Vinyl Ester
Surface Preparation on Arrival
Vinyl Ester
Surface Preparation
Vinyl Ester
Surface Preparation
Vinyl Ester
First coat applied after abrasive blasting
Vinyl Ester
Pitfilling to ensure coating continuity
Vinyl Ester
Application of second coat of RB 364
J Strainer
Vinyl EsterQA testing being completed
Vinyl Ester
Application of Anti-Foul
Vinyl Ester
Vinyl EsterApplication of Anti-Foul
Vinyl Ester
Application of Anti-Foul
Vinyl Ester
Vinyl EsterFirst Coat of Anti-Foul
Vinyl Ester
Externals Completed
Vinyl Ester
Machining of Shaft Landing
Vinyl Ester
Top half complete and ready for re-assembly on site
Vinyl Ester
Top half complete
Vinyl Ester
Ready for reassembly on site
Vinyl Ester
Reassembly on site
Vinyl Ester
Completed on site

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

Results:

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