Product category:
Conventional Industrial Liquid flowmeters
News Release from: McCrometer | Subject: V-Cone Subsea Flowmeter
Edited by the Processingtalk Editorial
Team on 16 September 2005
V-Cone subsea flowmeter delivers high
accuracy
The V-Cone Subsea Flowmeter offers superior accuracy and repeatability in a highly compact, no-moving parts instrument that requires virtually no recalibration or maintenance over a long life
Petroleum process engineers looking for a precise, reliable, compact flow measurement solution for deepwater module applications, will find the V-Cone Subsea Flowmeter from McCrometer offers superior accuracy and repeatability in a highly compact, no-moving parts instrument that requires virtually no recalibration or maintenance over an exceptionally long life With oil/gas in short supply, the need for subsea oil and gas production continues to grow in marginal fields once thought to be un-economical
This article was originally published on Processingtalk on 11 Apr 2005 at 8.00am (UK)
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Locating production modules thousands of feet below the sea presents a highly rigorous operating environment for flow measurement instrumentation.
The McCrometer V-Cone Subsea Flowmeter is ideal for the subsea production environment.
It relies on an advanced differential pressure flow sensor designed with built-in flow conditioning to achieve an accuracy of 0.5%, with a repeatability of 0.1%.
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It operates over a flow range of 10:1, and comes in line sizes from 0.5 to 120 inches.
With its unique ability to self-condition flow, the V-Cone Subsea Flowmeter is a real space-saver, eliminating the need for long up/down stream straight pipe runs required by other DP technologies, such as orifice plates and venturi tubes.
It can be installed virtually anywhere in a piping system, or can be easily retrofit into an existing piping layout, providing installation flexibility and initial cost savings.
Unlike traditional DP instruments such as orifice plates and venturi tubes, the V-Cone Subsea Flowmeter design is inherently more accurate because the flow conditioning function is built-into the basic flow sensor design.
The V-Cone conditions fluid flow to provide a stable flow profile that increases accuracy.
The flowmeter design features a centrally-located cone inside a tube.
The cone interacts with the fluid flow and reshapes the velocity profile to create a lower pressure region immediately downstream.
The pressure difference, which is exhibited between the static line pressure and the low pressure created downstream of the cone, can be measured via two pressure sensing taps.
One tap is placed slightly upstream of the cone and the other is located in the downstream face of the cone itself.
The pressure difference can then be incorporated into a derivation of the Bernoulli equation to determine the fluid flow rate.
The central position of the cone in the line optimises the velocity of the liquid flow at the point of measurement.
It forms very short vortices as the flow passes the cone.
These short vortices create a low amplitude, high frequency signal for excellent signal stability.
The result is a highly stable flow profile that is repeatable for continuously accurate measurement.
All of this is possible with a minimal straight pipe run of 0 to 3 diameters upstream and 0 to 1 diameters downstream from the flowmeter.
The V-Cone Subsea Flowmeter flow measurement technology has been employed successfully in the oil and gas industry and solves some of the toughest flow measurement problems including wet gas, condensate, and dirty or abrasive flows in off-shore installations.
In addition to wet gas applications, other applications include gas lift, gas injection, leak detection, flare emission systems and more.
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