Chemical Technology November 2015

FOCUS ON CONTROL & AUTOMATION

OPTIMASS 7000 – corrosion-resistant in all applications

According to a recent report, the OPTIMASS 7000 from KROHNE is the only sensor for mass flow with a sin- gle straight measuring tube that is available in titanium, stainless steel, Hastelloy® or tantalum.

Reliable, proven, precise Magnetically inductive flowmeter

Steel corrosion can pose a problem during oil production and in the downstream processing using acidic catalysts, however, this iso problem for the OPTIMASS 7300 A which boasts a straight measuring tube made of highly corrosion resistant tantalum alloy. Even difficult media such as hydrochloric acid, sulfuric acid, nitric acid and other acids for reaction processes do not attack the measuring tube. The device is also interesting in terms of the price as a much smaller amount of tantalum is required for the straight measuring tube than for devices featuring twin bent tubes. OPTIMASS 7000 fea- tures the patented Adaptive Sensor Technology (AST), permanently providing precise and stable measuring results, even under difficult process conditions and non-optimum installation. Regardless of whether you are filling phials or tankers, whether the mixtures are highly viscous or inhomogeneous, or whether it is installed between flexible hoses or fixed pipelines, results will be successful. 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. 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. It was not until the advent of the single straight tube design that the material became more suitable, since the design now only needed 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 the titanium traditionally employed. KROHNE, a world leader in straight tube technology, has applied its years of experience and been granted several patents, for per- fecting the technology of containing the stress created in a straight tube due to thermal expansion. The company is now in a position to use this innovative technology for highly aggressive and corrosive chemicals. The tantalum used by KROHNE is an alloy called Tantalum Ta10W, made up of 10 % tungsten and 90 % tantalum. With the addition of tantalum, KROHNE can now offer a wide range of wetted materials for most chemicals. In summary, the OPTIMASS 7000 from KROHNE offers the fol- lowing advantages: • Universally applied due to a wide range of models • Secondary containment complies with pressure equipment guidelines • User-friendly software Flow Toolbox.

GEMÜ 3030 mFlow enables a combined measurementofflowrateandflowvelocity: • Available in various body configurations and connections • Parameterisation during operation • For nominal sizes DN 25 to DN 300 • Fieldbus interface (optional) • Integrated temperature measurement (optional)

GEMÜ VALVES AFRICA (PTY) LTD Stand 379, Northlands Business Park Hoogland Ext. 45

Northriding, Randburg Phone: (0)11 462 77 95 info@gemue.co.za www. gemu-group .com

For more information tel: +27 11 314 1391 or go to www.za.krohne.com.

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Chemical Technology • November 2015