Case Study: Composite External Tank Repair

External wall failure, post surface prep.

Post repair using Corroglass 600

Problem

A process vessel experienced a brick and mortar lining
failure resulting in the process environment consuming
the carbon steel shell 90’ above grade. A full repair
would have required more than a week of unscheduled
downtime, so an RFQ was sent out to contractors for an
external patch that wouldn’t further degrade the internal
liner. Other proposals called for welding, risking further
liner damage that could cause bricks to enter the
process.

Solution

Corrocoat proposed applying a composite patch
designed to withstand the corrosive 180 F environment
that required no hot work along with less time and
investment than all other proposals.
The area was first scrapped carefully by hand to expose
the level of degradation, exposing a 5’ vertical void in the
shell surrounded by smaller voids. The thinner areas
near voids were prepared with power tools (SSPC-SP3) to
protect the integrity of the liner prior to commercial
blasting the surrounding areas (SSPC-SP7).
Once clean of excess corrosion, the surfaces were
washed to remove salts prior to final surface preparation
to white metal (SSPC-SP11 and SSPC-SP5) and priming
with Corroglass 600 Series.

Coating

Corroglass 600 Series is a line of vinyl ester materials specifically developed for process internals, resisting chemical laden environments at up to 230 F immersed, 330 F nonimmersed. Corrocoat 600 Series includes a lamination resin and barrier linings of three different viscosities that can hang at up to 3mm without sagging and be applied wet-on-wet in films of up to 8mm eliminating the long wait times between layers with other composite repair systems.

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