December 2009Flow Measurement & Control
Mass Measurement
A corrosion-resistant Coriolis mass flowmeter.
Krohne has launched a new tantalum version of its OPTIMASS 7000 Coriolis mass flowmeter to handle the highly aggressive and corrosive fluids found in the chemical industry.
The past decade has seen Coriolis flowmeter technology become the accepted standard in many chemical industries. However, one area where the technology was challenged was the measurement of highly aggressive and corrosive fluids. This was due to the commercial availability of a suitable measuring tube material to cope with these chemicals.
Generally, the wall thickness of Coriolis measuring tubes are significantly less than the associated process piping, which will tolerate a higher rate of corrosion before failing. This is an area where wetted material selection for a Coriolis meter is critical.
Tantalum has been used by some Coriolis manufacturers in the past, but the twin bent tube designs made these expensive. This was due to the flange, flow splitter as well as the measuring tubes all being made from tantalum.
It was not until the advent of the single straight tube design that the material started looking more attractive, now only needing the measuring tube and the raised face of the process flange to be made from tantalum. This brought major cost advantages over the equivalent bent tube designs, but was not easy to achieve as tantalum does not have the same tensile strength as titanium which is traditionally employed.
Krohne has applied its years of experience to perfect the technology of containing the stress created in a straight tube due to thermal expansion and is now in a position to make this innovative technology available in highly aggressive and corrosive chemical applications.
The tantalum alloy used is made up of 10% tungsten and 90% tantalum. It is the ideal material for use in the OPTIMASS 7000 as tungsten provides the additional tensile strength required to handle the stresses associated with straight tube technology.
“This is another innovation from our research and development team who have employed over 15 years of experience in single straight tube design to harness this technology,” said Frank Grunert, global product manager for mass flow. “If you have measurement problems with a glass lined process pipe or glass lined vessels, then OPTIMASS with tantalum is the solution as tantalum has similar chemical resistance to glass.”
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