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Long Term Corrosion Protection to Screw Agitator

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Long Term Corrosion Protection to Screw Agitator

Industry                           

Food and Beverage

 

Date

February 2018

 

Substrate

Carbon steel Auger with a red oxide coating, in service for 2 years

 

Products

Epo-Chem RS500P & RA500M a moisture and surface tolerant MIO primer with a glass flake filled epoxy top coat.

 

Environment

Constant salt water contact in seaweed filtering process

 

Challenge

Agitator had deteriorated over time causing rust and scale to contaminate the product

 

Chemco’s Solution

Repeat abrasive blasting and hot washing to reduce metallic salts below 25 ppm. Pit filling of deep metal loss and composite reinforcement where required.

 

On Arrival
Condition on Arrival
Finished Product
Completion

 

Scope

Abrasive blast to AS 1627.4 Class 2.5, nominal 75µm profile.

High pressure hot wash to reduce soluble salt levels below 25ppm

Repeat Abrasive Blast

Insert backing rod in shaft end to prevent blocking up with coating

1 coat of RS500P at 100µm nominal thickness

2 coats of RA500M at 600µm nominal thickness

Carry out QA, spark test at 4kV and DFT to confirm coating integrity.

 

Results

Quick turn-around allowing auger to return to service within the month.

Strict QA requirements including DFT and holiday testing to the required voltage to ensure many years of service