Flow Level Pressure
Coriolis Mass Flowmeter for Bulk Measurement in the Oil and Gas Industry
Jul 10 2009 Comments 0
When it comes to applications where calibration and charging are required, the oil and gas industry is reliant on accurate mass flow meter readings — even at low flow velocities. Because Coriolis technology is also being used for gas measurements, the demand for Coriolis devices with larger nominal widths to record very large flow volumes is growing rapidly. The drivers behind manufacturing in sizes from 6 to 10 inches (DN 150 to DN 250) are the requirements and the ever-increasing spread of this technology in the crude petroleum and gas industry, particularly for bulk transportation of crude petroleum products. Crude petroleum and gas refineries constitute the second-biggest area of use for Coriolis flow meters, after the chemical and petrochemical industry. Krohne (Germany) is now following these new products with the Optimass 2000, in three nominal widths: S100 (DN 100/150), S150 (DN 150/200) and S250 (DN 250/300).
The Optimass 2000 stands out on account of its twin straight tube design, where the length of the pipes has been optimized to ensure a stable Coriolis signal and thus highly accurate metering and zero point stability, even at low flow volumes. This is especially important when metering hydrocarbons, where the flow velocity is not permitted to exceed a given value due to the risk of static charges. For measurements where calibration is required, too, a good metering range is required for many applications.
OPTIMASS 2000 satisfies this requirement, pursuant to 97/23/EC (the Pressure Equipment Directive). This means that a maximum level of safety is ensured at high operating pressures. In addition, the flow meter can also be equipped with high-pressure flanges to PN 160 or ASME 1500lb and in sizes to DN 300 or 12 inches. The outer cylinder manufactured entirely in stainless steel with a rupture pressure of over 100 bar ensures that the product remains enclosed in a pressure-resistant casing and cannot leak out directly. If the operating pressure exceeds the rupture pressure, a rupture disk in the pressuretight casing is used to ensure high levels of safety. To keep the loss of pressure as low as possible and to prevent cavitations where there are high flow volumes, there has been significant investment in optimizing the flow distributor. Testimony to the fact that this objective has been achieved comes, for example, from the size 250 flow meter, which allows for flow volumes of up to 2300 metric tons/hour.
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