CASE STUDY

Underwater Lagoon Repair – South Africa

Client: Freshwater Lagoon Owner

Industry: Industrial

Scope: Underwater Refurbishment

Date: 2019

Location: South Africa

Products: RA 500UW-LV

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OVERVIEW

The large freshwater lagoon (c.40,000m2) in South Africa required to be refurbished with a coating solution that would provide long-term corrosion protection.

CHALLENGE

It was decided that the greatest time and cost efficiencies would be achieved by carrying out the coating application without removing the water from the lagoon.

As a result, the chosen coating solution had to be applied underwater whilst ensuring the required adhesion, corrosion protection and without contaminating the water in any way.

SOLUTION

Chemco’s Diver-cote™ RA 500UW-LV was identified as the only viable coating solution on the market which could fulfill the application.

The underwater surface was prepared using a combination of water jetting and mechanical tooling which removed all prior coating/algae and created a suitable surface profile.

RA 500UW-LV was then applied to a thickness of 400μm using both brushing and power brushing.

OUTCOME

The solvent-free, wet tolerant properties of the Chemco system allowed the coating application to be completed quickly and efficiently, with the lagoon returning to full service within the given timeframe.

BENEFITS

Solvent-free
• Wet tolerant
• Glassflake-reinforced for exceptional abrasion resistance
• Eco-friendly application with little dispersion in water
• Excellent adhesion to minimal surface preparation
• Excellent abrasion and erosion resistance
• Long-term, maintenance free performance
• No recoating limitations

external view of lagoon before refurbishment

Original Conditions

old failed coating peeling from underwater substrate

Original Conditions

old failed coating peeling from underwater substrate

Original Conditions

diver applying chemco coating to underwater substrate

During Underwater Application

diver applying chemco coating to underwater substrate

During Underwater Application

diver applying chemco coating to underwater substrate

During Underwater Application

external view of freshwater lagoon with palm trees in background

Lagoon Overview

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