Siem Atlas – Box Cooler Service
Recoating of 8 box coolers on Siem Atlas. Full cleaning, acid treatment, sandblasting and coating carried out to extend cooler lifetime and improve hull protection.
Location:
Prismar Workshop / Yard Dock in Rio, Brazil
Client:
Siem Offshore
Vessel:
Siem Atlas
Type of work:
Full recoating of box coolers
From date:
21.05.2023
To date:
05.06.2023
Project summary
NGP was contracted to carry out full maintenance and recoating of eight box coolers from Siem Atlas at Prismar’s workshop in Brazil. The project included mechanical and chemical cleaning, sandblasting, two-coat application and curing.
How we worked
The coolers were first mechanically cleaned and then submerged in a hydrochloric acid solution (5–7%) to remove marine scaling. They were neutralised in saltwater, flushed, and high-pressure washed. After drying, each cooler was sandblasted with Garnet Mesh 30/60. Painting was done using Säkatonit Extra AR-F, applied in two coats with 72 hours of curing before final prep and delivery.
Results
All eight coolers were successfully cleaned, recoated and protected with a robust epoxy system designed to prevent galvanic corrosion and improve heat exchange performance. Final curing and surface prep were completed with guidance from NGP and site support from Prismar.
What we used
- Säkatonit Extra AR-F (2-coat system)
- Garnet Mesh 30/60
- Hydrochloric acid
- Thinners: Xylene & N-Butanol mix
- Custom-built curing and drainage setup
Reflections
This was a technically demanding project with high environmental and material standards. The coating system used will offer long-term protection, better thermal efficiency, and improved resistance to fouling – ensuring operational reliability for years ahead.
