The BASF chemical company has chosen the tantalum version of Krohne’s Optimass 7300 C device to fill tankers with highly aggressive and toxic liquids. These devices measure the mass flow of chloroformates and acid chlorides used in the manufacture of plastics, pharmaceuticals and packaging products, at a rate of 60 t/h.
BASF chose the tantalum version because a mass flowmeter with high chemical resistance was the only option suitable for this application and the pipelines into which the meters are installed feature an enamel lining. The customer decided on the Krohne Optimass 7300 C, because this device features a single, straight measuring tube, eliminating the need for a flow splitter. Due to the straight tube, cleaning processes have been optimised, preventing product build-up on the inner walls of the measuring tube. In addition, significantly less space is required for installation compared to the twin U-tube format.
Using this design, means that only the measuring tube and the raised face need to be made of tantalum, which translates into a considerable cost advantage over the twin U-tube meters. Thanks to many years of experience in the development of Coriolis straight tube meters, Krohne was able to solve the problems to offer the Optimass 7300 C, its first straight tube measuring device with one single measuring tube in tantalum. The alloy used is designated Ta10W and consists of 10% wolfram and 90% tantalum. The wolfram portion guarantees higher measuring tube stability and the chemical resistance of tantalum is comparable to that of glass.
In addition to tantalum, Krohne also supplies the Optimass series in Hastelloy C22, duplex and super duplex stainless steel and titanium. Typical applications include the measurement of concentration or density, bulk loading, batching to reactors, hydrocarbon cracking, aggressive, abrasive or viscous mediums or mediums of unknown composition.
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