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Whitepaper: Bliss Anand America Partner BADOTHERM successfully developed Reliable Pressure, Level and delta-P Measurements with Diaphragm Seals for All UREA Plant Technologies

July 13, 2017

Summary
Measuring pressures, levels and delta-P’s in UREA plants is a real challenge. Crystallization, erosion and corrosion risks have to be taken care of. Typically diaphragm (or membrane) type of measurements are applied nowadays but its lifetime is typically limited (e.g. max one year). After this period, these diaphragms face corrosion problems and mostly needs to be replaced. This means the UREA plant needs to shut down mostly unexpected leading to significant costs in production loss. More and more UREA plants target continuous running periods between planned turnarounds of two, four to even six years.
Sometimes one is able to keep the plant in operation but one needs to operate the plant under non-optimum process conditions. Such a situation also leads to a significant negative financial impact as illustrated in this paper. BADOTHERM is a well-known manufacturer of reliable diaphragm seal type pressure, level and delta-P measurements suitable for all UREA process technologies. Significant costs can be avoided and additional profits can be gained with the BADOTHERM Diaphragm Seals mounted to Pressure Transmitters, for pressure, level or delta-P measurements. Badotherm has several designs and materials available meeting the specific requirements of the UREA industry. 

 

Overview of the current challenges

Carbamate and UREA easily crystallizes when temperatures become too low. In the early days, flushes were installed at the transmitter legs to avoid crystallization, however its reliability was very limited and a lot of attention and maintenance was required. Moreover, these measurements introduced certain safety risks. Nowadays extended diaphragm seals are applied, which do not require any flushes anymore, as the diaphragm is now flush with the process. However, in case of any damage of