Chemco Outlasts The Competition

Chemco was approached by one of the world’s leading ship management companies to provide a solution for corrosion which had occurred within the water ballast tanks of a major crude oil tanker.

The ballast tanks had originally been coated in 2002, and were showing considerable wear and tear damage. As a result, they were looking for a new coating system to be applied.

The tanks were water-jetted to WJ-3 standard before one stripe coat and one full coat of solvent-free, wet & rust tolerant epoxy
Epo-chem™ RS 500P were applied.

Due to the unexpected scale of the project, certain additional areas of the ballast tanks had to be coated in a conventional, solvent-based paint from a different coating manufacturer. This conventional paint was applied using the same surface preparation, shipyard crew and at the same time as Chemco’s RS 500P.

After 1 year in-service, the ship management company carried out tank inspections and found a clear difference in quality between the tanks coated by Chemco, and those coated by the separate manufacturer. The conventional paint system was failing after only 1 year, whereas Chemco’s RS 500P remained in very good condition.

The below chart compares the two coating systems utilised in this project; Chemco’s Epo-chem™ RS 500P and the conventional, solvent-based paint.

The unique characteristics of Chemco’s coating system ensure a durable, long-lasting performance which is perfectly suited to withstand the internal rigours of water ballast tanks.

The premature rust exhibited by conventional (non-Chemco) paint will invariably lead to a deterioration of the ballast tanks; having a negative impact on their long-term safety and performance.

RS 500P Conventional Paint
Surface Preparation Water Jetting (WJ-3) Water Jetting (WJ-3)
Application Timeframe Can be applied immediately after surface preparation (no need to dry substrate) Surface must be completely dry
Volumes Solid 100% (Solvent-free) 80%
Environmental Conditions No humidity or dew point restrictions If humidity is above 80%, do not apply
Dehumidification/Ventilation Requirements No extensive requirements Large and expensive dehumidification and ventilation equipment requirements
Recoating Intervals No limitations 3 months
Health & Safety/Fire Hazard Environmentally and application friendly process Solvent-based which considerably increases environmental and applicator risk
Operational Shutdown No shutdown required. Nearby work (including hot work) can continue without disruption All surrounding trades cannot continue as normal
Back-in-service Times Ballast after 4-8 hours (can ‘continue to cure’ underwater) Must be allowed to full cure (up to 14 days)
painted grey tank wall internals

Chemco Coating After 1 Year

heavily rusted internal tank walls

Conventional Paint After 1 Year


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