Safurex® thin foils for Pressure, Level and Flow transmiters

In the urea plant carbamate corrosive environments are commonly found in the HP synthesis, MP and LP sections. Carbamate, especially in the HP synthesis section, is very corrosive, even for stainless steels.

For delicate diaphragms used for pressure and differential pressure measurements this proves to be an even bigger challenge as there is (almost) no corrosion allowance, the diaphragm’s thickness is somewhere near to 100 µm (0.1 mm/0.004 inch). The conditions are even worse for diaphragms in the vapor phase of such sections due to a phenomena called condensation corrosion.

Therefor the choice of material, the processing (shaping, welding) of such diaphragms and the application is particularly important.

The repair/replacement of a failed diaphragm type pressure or differential pressure instrument usually requires the shutdown of the process or the process unit. This leads to expensive downtime, capacity turn down or even potentially unsafe operations.