March 2010Flow Measurement & Control
Mass Measurement
Optimass tantalum mass flowmeter selected for use in aggressive media application.
In Switzerland, an Optimass 7300 C Tantalum meter doses a highly aggressive liquid into a column in which a vitamin is manufactured. The meter measures the mass flow of Toco Toluol, an aggressive acidic solvent, in a range of 0-7000 kg/h at a pressure of 2 bar.
The operator chose the tantalum version because a mass flowmeter with extremely high chemical resistance was needed for this application. The Optimass 7300 C Tantalum offered a crucial advantage over competitor products: one single, straight measuring tube that eliminates the need for a flow splitter.
Thanks to the straight tube, the customer was able to select a significantly smaller diameter (DN 25 instead of the DN 50 used previously), thus achieving an increased flow rate. This prevents the product from being deposited on the inner wall of the measuring tube.
The tantalum alloy employed is designated Ta10W and consists of 10% wolfram and 90% tantalum. The wolfram guarantees gives the measuring tube the higher stability necessary for straight tube technology. Tantalum’s resistance to chemicals is comparable to that of glass.
In addition to tantalum, Krohne also supplies the Optimass series in hastelloy C22, duplex steel 318L, titanium, and stainless steel 316L. This broad portfolio of mass flowmeters is suitable for use with the most aggressive media in the chemical industry, covering almost any application.
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