Case Study: XT & VEF for an absorber

High temperature protection in a desulphurization plant.

Client

Power industry.

Application Date

May 2004.

Scope Of Work

An internal inspection of the coating used on an
absorber in a large CHP station was initially carried out.
The inspection highlighted the coating system that had
been in place for just 3 years was suffering severe
breakdown – especially in the upper areas where the
working temperature is close to 392°F. The project
scope then was agreed to be the complete
refurbishment of the internal coating of the absorber

Products

Corrothane XT in the upper higher temperature areas
and Polyglass VEF in the remainder.

Substrate

Steel fabrication.

Coating system

• Grit blast internally to SA 21/2.
• Apply Corrothane XT to upper 170m2, and Polyglass
VEF in the lower 400m2 to a minimum dft of 1.25mm.
• Spark tested and thickness checked 100% of the
applied coating to ensure no holidays.

Coating credentials

Following the early failure of the initial coating system
(a European manufactured Epoxy coating), the
customer was eager to find an alternative coating
system that could withstand the service requirements –
and additionally give extended service life without
maintenance.
Corrothane XT is a cold cured vinyl ester and
polyurethane hybrid developed for coating steel where
high temperature resistance is required – and Corrocoat
seemed the obvious choice for the high temperature
sections.
Reports from the power station remain positive, and as
a result of no breakdown whatsoever in the first year of
operation with the Corrocoat system, Corrocoat have
been awarded the refurbishment project of another
similar absorber tower.
Corrocoat is confident that the coating system will
continue to provide the required protection for many
years to come – and will audit regularly to assess.

Photographs

Left: View of the exterior of the absorber tower – above
Right: View of the exterior of the absorber tower – below