Immersion Zone Coating

 Immersion Zone Coating is a protective coating for steel or concrete that is always underwater or in liquid like in seawater tanks, ballast tanks and pipelines.

Where is Immersion Zone Coating used?

 Offshore platforms below the waterline
Sea water intake and outfall pipelines
 Ballast tanks
 Potable and firewater tanks
 Wastewater tanks
 Underground steel exposed to groundwater
 Internal tank bottoms
Key Requirements for Immersion Zone Coating
The coating needs to be good in these areas because it stays wet all the time:
  Excellent water resistance
   protection against corrosion
 Strong adhesion to blasted steel
  Chemical resistance
   Abrasion resistance
   Long-term durability, under immersion

Immersion Zone Coating

 

Common Immersion Zone Coating Systems

1. Pure Epoxy / High-Build Epoxy

+ Most common coating used
+ Has water resistance
+ Often used in tanks and submerged steel

2. Phenolic Epoxy

. Offers better chemical and temperature resistance
+ Typically used for process tanks and aggressive services

3. Glass Flake Epoxy

+ Provides barrier protection
+ Often used in offshore splash and immersion areas

4. Coal Tar Epoxy

. Older systems; less common now
+ Used for underground and marine services

5. Epoxy Novolac

+ Heavy-duty chemical immersion

 Example of an Industrial Immersion Zone Coating System

 Surface preparation: Sa 2.5 blasting
 Stripe coat: edges and welds
 Primer: epoxy
   Intermediate: high-build epoxy
  Finish: immersion-grade epoxy
Dry Film Thickness (DFT): 300–600+ microns depending on the service.