Friday, 07 March 2014 00:00

Heat Exchangers

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The most common model of heat exchanger  is probably the “shell and tube” model, a device which normally consists of a cast iron or steel shell containing a calculated number of tubes with certain diameters.

The tubes rest on a tube plate made out of brass, or copper/zinc alloy (muntz metal), or copper/zinc/tin alloy (admiralty metal).

Water flow is regulated by dividers and is extremely turbulent, this has the tendency to create rapid erosion.

What’s more, heat exchangers suffer from bimetallic corrosion due to the existence of various and differeing metals in close proximity. This is unfortunately almost always aggravated by the generally corrosive nature of cooling water used.

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When you add on top of this some very commonly encountered factors like poor water treatment and lack of proper maintenance, you can see why heat exchangers require more systematic attention by 'Unique Polymers Systems' highly trained “polymer people”.

The most common problems are de-zincification of the tube plate and graphitisation of the division bars.

 

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While such problems are easily solved by Unique Polymers Systems ceramic polymers, the heat limitations of Unique Polymers Systems advanced polymers (2030C-DRY/930C-WET) coupled with problems of difficult access can sometimes prevent “polymer repairs” from being carried out more extensively, i.e. inside the shell.

Polymer repairs on tube sheet plates are generally exposed to moderate temperatures like 480C.

 

FURTHER INFO here (.pdf)  pdficon

 

Repair Don’t Replace

Read 4358 times Last modified on Friday, 07 March 2014 16:26