Flow measurement plays a critical role in the petroleum industry for producers of both crude oil and natural gas and in the chemical petrochemical industry. After crude oil is removed from the ground, it passes a number of custody transfer points before reaching a refinery.
Oil is measured in the refinery, and refined products are measured as they leave the refinery. With a product so valuable, it is important to know how much is being transferred at many points along the way.
Flow meters also play an important role in this market. These include turbine, positive displacement (PD), and differential pressure (DP). Traditional flow meters have been in the market for more than 70 years. Some of these meters, such as turbine, differential pressure and positive displacement.
Trend towards newer technology has been in the works for more than 15 years. This newer flow sensor technology is not only experiencing the most promising growth rates, but taking considerable market share away from the older, more traditional flow sensors.
The flow transmitter technology
Positive displacement flow meters operate by capturing the fluid in small compartments whose size is exactly known. The meter counts how many times this capturing occurs. This value is then converted into a flow rate, sometimes by the use of a flow computer. The history of PD meters goes back to the early 1800s.
Fluid flow initiates rotation of the almost frictionless gears and the measuring chambers that are constituted by the space between the gear teeth and the housing, define a known discrete volume of liquid that pass through the meters. The rotation of the gear wheels is such that exactly one tooth pitch defines that volume.
This rotation is detected by a system of two non-contacting magnetic field coils that are offset by a quarter of a tooth pitch. This phase shift in gear rotation recognizes the flow direction as well as provides for doubling or quadrupling of impulses that lends the meter an excellent capability for resolution of the generated flow signals.
Positive displacement flow meters are widely used in liquid hydrocarbon measurement for custody transfer and chemical process applications. They are used to measure the transfer of liquid hydrocarbons to and from trucks, rail cars, and airplanes.
Oval Wheel Meter
Measuring the volume flow rate of liquids and liquefied gases and in loading systems in the chemical and petrochemical industry, in the mineral oil industry, in the food and beverage industry. Positive displacement (PD) flow meters are the workhorses of today’s flow meter world. They perform many important flow measurements most people take for granted.
Oval Wheel Flow transmitters with just 2 moving parts (the friction less oval wheels).
Indifferent to line stress, straight length requirement, external pipe line vibrations, the PD meters is one of the most preferred flow meter technologies for fuel oil handling, and batch process application.
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