Vortex shedding provides accurate flow
The Myers-Aubrey Co. reports that industry is using vortex-shedding flowmeters in such applications as air, water, and natural gas measurements as well as gas-well testing, liquid-hydrocarbon flow control, and custody transfer for cryogenic LNG measurements. Based on the direct relationship between shedding frequency and flow velocity, the flowmeters are capable of linear and repeatable operations over a wide flow range, have low maintenance costs and long-term accuracy, and are considered reliable. The Eastech vortex flowmeters use 4 different sensing methods. Three are based on thermal sensing in which the heated sensor responds to the cooling effect of flow; the fourth technique involves a shuttle-type sensor that is moved back and forth by the vortex shedding along the flow axis. The resulting signals are transformed into electrical pulses for further electronic processing. These flowmeters are low-pressure-loss devices that can measure gas flows in a 2-in. pipe as low as 13 SCF/min with an accuracy of +/-0.25%. For liquids with viscosities close to that of water, the minimum flow in a 2-in. pipe is 7.5 gal/min. Increasing viscosity raises the minimum measurable flow rate.
- OSTI ID:
- 5167531
- Journal Information:
- Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 73; ISSN OIGJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
032000* -- Natural Gas-- Transport
Handling
& Storage
ACCURACY
AIR
DESIGN
ENERGY SOURCES
FLOW RATE
FLOWMETERS
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FLOW
GAS FUELS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
LIQUEFIED GASES
LIQUEFIED NATURAL GAS
MEASURING INSTRUMENTS
METERS
NATURAL GAS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
VISCOSITY
VORTEX FLOW
WATER