Chemco Case Studies

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Life Extension of 40 year old Structural Steel

Industry                           

Power Generation

 

Date

2016

 

Substrate

Critical overhead pipe support structure outside turbine hall

 

Products

Epo-Chem RS 500P a wet and surface tolerant mio epoxy primer and Epo-Chem RA 500 series, a moisture tolerant glass flake filled epoxy top coat, providing excellent long term corrosion resistance.

 

Environment

15°C – 60°C sea water

 

Challenge

The original environment was considered atmospheric, due to regular leaking valves and flanges the coating specification was necessary to be reclassified to immersed after the original paint system failed.

Access difficulties and age were all a consideration as part of the assessment process. Abrasive blasting was not possible as the containment and clean up costs we’re prohibitive.

Chemco’s Solution

Mobilise to site

Ultra high pressure water blast up to 20,000 psi using our small foot print machine after  a quick mechanical clean in the difficult to reach areas. Carry out soluble salts test to ensure the levels are within the coatings parameters.

Application of Epo-Chem RS 500P to a nominal thickness of 100µm and top coat using Epo-Chem RA 500 with a nominal DFT of 350µm

Typical extent of corrosion found
Typical extent of corrosion found
Ultra high pressure water blasting
Ultra high pressure water blasting
Gaps between pipe saddles and pipe are sealed to prevent moisture and air
Critical support structure now protected

 

 

Results

Saved hundreds of thousands of dollars in replacement costs and the asset owner is rest-assured that Chemco will provide long term corrosion protection, evident through the years of applications around the power station.