In order to reduce CO2 emissions of diesel engines in the EU the so called
Euronorm 4 was introduced by the European Commission.
By injecting a 32 % urea mixture, in the exhaust pipe of diesel engines, NOx
emissions can be transformed into nitrogen and water. The urea-water
mixture is stored nowadays in above ground temperature controlled FRP
tanks or in SS 316 underground tanks. Recently, research made clear that the
use of internally coated carbon steel tanks together with an impressed
current cathodic protection (ICCP) system is a far better economic and
technical solution. Unless different side effects of ureum storage the first
try-outs of the system seemed very promising for the fuel retail industry