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Chemical Storage Tank Relining

OVERVIEW:    When you’re storing harsh chemicals like sulphonic acid, unfortunately deterioration, staining, and corrosion are inevitable. That’s why relining storage tanks with high-performance anti-corrosion products is so important.

INDUSTRY

ENVIRONMENT

Sulphonic Acid Storage at 50°C

SUBSTRATE

Chemical Storage Tank – Mild Steel, with external Cladding

CHALLENGE

The existing epoxy lining in the chemical storage tank which housed sulphonic acid at 50oC was in poor condition. Large sections had suffered extensive deterioration alongside staining and corrosion of the tank wall. This had subsequently stained the finished product, which prevented its use until a long-term solution was found.

SOLUTION

Scaffolding was set up inside the tank, and efficient surface preparation techniques were utilised in order to minimise mobilisation of blasting costs, while still achieving an ideal surface for effective coating adhesion.

The team started with abrasive blasting of the steel tank in accordance with AS 1627.4 – 2005 to class Sa 2.5 60μm surface profile.

One coat of Epo-chem™ RS 500P was applied to a nominal thickness of 100μm, followed by a single coat of Epo-chem™ RA 500M to a nominal DFT of 350μm. The flanges were then sanded and internals finished off , before carrying out an internal QA and DFT check.

SCOPE

Mobilise to site and set up extraction

Abrasive blast to AS 1627.4 2005 Class 2.5, 60μm profile

Application of 1 coat of Epo-Chem RS 500P to a nominal thickness of 100μm

Application of 1 coat of Epo-Chem RA 500M to a nominal DFT of 350μm

Sand flanges and finish off internals

Carry out internal QA, DFT check

PRODUCTS

Epo-chem™ RS 500P

Epo-chem™ RA 500M moisture tolerant glass flake filled epoxy topcoat, designed for immersed applications

OUTCOME

By leveraging the advanced Epo-Chem™ coating system in such a corrosive environment, Chemcote were able to restore the chemical storage tank back to service, with long-term peace of mind for the customer knowing their equipment was now protected

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