Chemco Case Studies


Apply Coating on Wet Surfaces using RL 500PF





July 2016



Steel Substrate



Epo-chem™ RL 500PF



Wet and Cold Column Externals



The lagging was removed to extend the life of the shell externals. While the vessel was in service, surface preparation and corrosion application were undertaken. Surface temperatures were ranging between -5°C to around +25°C. This causes the substrate to sweat heavily during coating application.


Chemco’s Solution

Wet & Rust Tolerant Epo-chem™ RL 500PF was recommended for this application to prevent CUI (corrosion under insulation). This system requires minimum surface preparation (i.e. no need for dry grit blasting). Rain, water, condensation or high humidity have no effect on freshly painted surfaces.

In this case, abrasive blasting was possible and coating was applied to an average DFT of 300µm total, achieved in two coats.


Column prior to start & partially lagged.
Column prior to start & partially lagged.
Unlagged cold zone
Unlagged cold zone
Unlagged corroded zone near top
Unlagged corroded zone near top
Maintenance painting completed whilst in service
Maintenance painting completed whilst in service



This is a prime example of innovative technology being used to save the Clients existing plant from the possibility of failure. The protective coating was able to provide a vast improvement in plant safety and also exceeded the engineer’s expectations, to the point that Chemco’s Epo-chem™ RL 500PF is now specified on all similar applications within this site.

Epo-chem™ RL 500PF is designed to provide corrosion protection for applications of up to 150°C and also is designed for application on new and aged galvanised steel, making it ideal for electricity pylons, exhaust stacks and CUI applications.


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