Instrumentation
Tackling high flow rates and custody transfers
Accuracy and reliability dominate the demands that process companies make on their flowmeter technologies, particularly when it comes to high flow rates and custody transfer. Eugene McCarthy reports.
Genauigkeit und Verlässlichkeit gehören zu den wichtigsten Anforderungen, die Unternehmen der Prozessindustrie an ihre Durchflussmessgeräte stellen, insbesondere bei hohen Durchflussraten und eichpflichtigen Anwendungen. Eugene McCarthy berichtet.
La précision et la fiabilité sont en tête des exigences formulées par les sociétés de traitement envers leurs technologies de débitmètre, en particulier lorsqu’il s’agit de débits élevés et de transfert de propriété. Eugene McCarthy témoigne.
M
edium to high flow applications, including gas and liquid custody transfer, process unit material balances
in refineries, and critical chemical feedstock measurements, now have a new measurement tool in the form of the Micro Motion Elite CMF350 Coriolis flowmeter from Emerson Process Management. Designed for line sizes from 3.5 to 4.5in (DN sizes of 90-125), the meter expands the Elite family by providing accuracy and reliability for customers who require measurement at higher flow rates. The Micro Motion Elite CMF350
flowmeter features an optimum level of scalability and standardisation for the best fit in applications where flow rate accuracy with low pressure drop and high turndown is critical. Specifically, this meter delivers 0.05% optional liquid mass flow accuracy and volume accuracy, ±0.35% gas accuracy and ±0.0002 g/cc liquid density accuracy. Maximum flow rates for this sensor reach 15,000 lb/min (409,000 kg/h). Emerson says this meter is ideal
for applications such as cementing, custody transfer of liquid and gas, production separation, basic and specialty chemicals, ethylene and crude production and manufacturing processes (Fig. 1). “The Elite CMF350 provides a
solution for those customers who desire peak performance and ultimate control for their critical and challenging applications,” said Bill Graber, vice president of marketing for Emerson’s Micro Motion business. Micro Motion Elite CMF350
meters are available with smart meter verification (SMV), which provides advanced diagnostics of meter health and performance without removing the sensor from the line or interrupting
the manufacturing or measurement processes. The verification is quick, easy and can be executed remotely without a trip to the field, additional instrumentation or data interpretation. SMV diagnostic reports are also increasingly recognised by third-party regulatory agencies, enabling work practice changes that save money and improve worker and environmental safety. For its part, Endress+Hauser
describes its AptiFlow averaging pitot tube as the cost-effective choice for measuring flow. Now the company is manufacturing a range of AptiFlows with two measuring probes for use in dual redundancy. Suitable for a range of applications, the dual redundancy option offers maximum reliability. These instruments can also be designed to meet users’ unique specifications.
Areas of leakage The AptiFlow has integral, three- valve manifold heads that allow the company’s PMD series of low range differential pressure transmitters to be direct mounted. This ensures the system is cost-effective and dependable as no extra parts are needed and potential areas of leakage are considerably reduced. There’s also no restriction on the size of the pipeline. What’s more, says the company, as it doesn’t required periodic recalibration, maintenance is often as simple as carrying out a regular inspection and installing a replacement when needed. Using differential pressure to
measure flow has become more popular in recent years, as AptiFlow designer Kenny McGouran explains: “Modern dp transmitters can accurately measure very low differential pressures and boast a turndown ratio as high as 1000:1 with little or no effect on accuracy. This makes flow measurement using the AptiFlow range a very attractive proposition.”
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