3 replies to this topic

[kaushik avs]

Currently we are using service water as wash water to our desalter in CDU. Heat exchanger has LP steam on tube side and wash water on shell side where the wash water gets heated to 120 deg C before going to desalter. When we are trying to use a mix of service water and stripped water as wash water, our exchanger is getting fouled (Scales of salts are being formed on tubes within 2 days). The metallurgy of tubes in CS. In other CDUs we are able to use stripped water along with service water and no fouling of exchanger is observed. How to proceed to identify the cause of fouling?

[lyeskrt]

Dear Sir 

The combination of 02 different water leads to scale formation.In your case try to use only 01 kind and do not mix them.

[P.K.Rao]

Check  your service water quality. If it contains large quantity of temporary hardness, it forms scales.

[danyelson]

Sometimes, the water source is very important. Combining two different sources (different TSS, salts contents, etc.), you could obtain a certain incompatibility between the two water streams. I suggest to consider first Laboratory analysis in order to see the water mixture behavior.