Traditionally, thick wall titanium tubes have been used in high temperature (U to 250 C), high pressure condition for shell and tube heat exchangers used for the production of urea.
To suit both this conditions, thick titanium tubes need to be used to withstand the high pressure and the cost of the heat exchangers multiplied exponentially due to the high cost of titanium.
The solution is to use a thin thickness of titanium , up to 0.7mm, on the inner pipe and wrapped with a Stainless Steel Tubes 2.3mm wrapped on the outer side, hence maintaining the thickness, but reducing the price of the tubes drastically.
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