Corrosion control in a steam boiler
Company: Citro misr, Cairo Egypt
Description of the problem and its negative consequences
There was one Merus ring installed at the feeding pipe of the boiler. Due to safety reasons there was first no change in the adding of inhibitors against corrosion.
In which way the customer checked the results of the trial
The iron content in the steam and the Blow down pipe was regularly checked. The steam is essential for the production, without steam they have to stop working. Therefore no changes at the existing setup of adding chemicals where made. During the weeks, the iron in the steam has gotten less and less, and finally stabilized on a very low level. From outside it could be seen the corrosion was less than before.
To avoid any risk, the adding of the inhibitors was stopped not before 6 weeks ahead the regular production break where service is made on the boiler. This was done, to be able to assure visually the function of Merus, by checking the appearance of the inner surfaces of the boiler. It was seen, that most of the surface was now black, coated with saturated iron, only a few red spots have remained.
After seeing this result the client has decided to stop adding corrosion inhibitors. To ensure the results and for safety reasons, the steam is regularly checked for iron.
Today the client saves not only the chemicals, but as well the costs for service of the dosing systems.