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Feedwater Limited
Tarran Way West
Tarran Estate
Moreton
WIRRAL
CH46 4TU

Telephone:
+44 151 606 0808
Fax:
+44 151 678 5459

Registered in
England & Wales
Number 1274270

Case Study
The Cleaning of a large glycol system at a UK brewery

The Problem
A large brewery with a 180m3 capacity glycol cooling system wished to replace the glycol solution to prevent future problems associated with the breakdown of the existing glycol.

There were two complicating factors:-

The site required the contents of the system to be changed whilst the system was operational.
The system had become corroded, necessitating the removal of corrosion products before the introduction of the replacement glycol.

The Solution
After the existing water treatment company declined to become involved,
Feedwater Limited was contacted and proposed a process utilising its cleaning product CORROSPERSE 84, an on-line cleaner that that is non-acidic and safely dissolves corrosion products, leaving the surfaces passivated.

The Process
Day 1. Sufficient solution was drained off and 5% by volume CORROSPERSE 84 was introduced.

Day 2 – 17. The cleaning solution was circulated and samples were analysed from around the circuit to detect and balance out low flow areas and ensure effective treatment throughout.

Day 18 – 19. Draining and balanced flushing of the circuit with water.
Day 20 – 21. When analyses showed that flushing was complete, new glycol was pumped to produce a final solution strength of 33%.
During the above process, all waste was removed in tankers to the local sewage treatment works for disposal.

The Results
The chart overleaf shows the progress of the cleaning process as determined by analyses for total iron and TDS.

The photographs, although from another project, show the effect of CORROSPERSE 84 in removing corrosion products and giving a passivated surface ready for refilling and reinhibition.

Clean and fully protected on the left. System before treatment of Corrosperse solution on the right.