Recycled Oil Containing Water

Download (215 KB)


The use of recycled oil as an energy source presents a significant processing problem. Because composition of the fluid is not consistent and it also may contain impurities, the use of conventional flowmeter technologies is not practical. ADMAG CA, however, has been shown to provide reliable and stable flow measurement of recycled oil containing water.

Reverse Osmosis Filter Monitoring

Reverse Osmosis Filter Monitoring 


One cement producer uses recycled oil as a kiln fuel. A Coriolis mass flowmeter was used to control the recycled oil flow, however the meter readings were very unstable which made reliable control impossible. The Coriolis meter's problems were related to the separation of the oil and water as the fluid traveled the length of the meter and also the changing composition of the components (oil and water) resulted in unstable densities. In addition, the meter's zero was unstable and it was also difficult to clean the inside of the meter.


Initially, consideration was given to applying a conventional magnetic flowmeter. However, because the oil and other residuals showed a tendency to build-up in the Coriolis meter, a similar situation was expected to occur in the magmeter and the electrodes would be covered with an insulating coating. With ADMAG CA the non-wetted, capacitively coupled electrodes are immune to the effects of coating. In addition, the shorter lay length, as compared to the Coriolis meter, would better handle the potential layer separation of the oil and water.

The ADMAG CA was tested in series with the Coriolis meter. The test conditions were as follows:

Fluid Conductivity: 2.94-3.07 mS/cm
Fluid Composition: 48% oil, 43% water, 9% other
Flow Range: 0-5 tons/hr
Meter Size: 1"
Temperature: 30°C (86 deg F)
Pressure: MPa (142 psi)
Meter damping: 3 seconds

The test set-up used is in the figure above. The recorded output of the Coriolis meter shows large output fluctuations. The recorded output of ADMAG CA, however, shows the output is stable and tracks the set-point closely.


  1. Be sure to measure the conductivity of the fluid to insure that consistent values are obtained.
  2. The water content and potential water/oil separation can significantly affect the fluid conductivity. Examine a fluid sample to determine whether a two-layer separation occurs immediately or happens gradually. If separation occurs immediately, measurement even with ADMAG CA may not be possible.
Coriolis Mass Flowmeter ADMAG CA
The suspected cause for the output fluctuation is the variation in the fluid's density The ADMAG CA output is stable without large output fluctuations


  • Impervious to coating problems
  • Measures ultralow conductivity fluids to 0.01 μS/cm
  • Stable output with varying levels of oil and impurities
  • Short lay length avoids problems due to fluid separation



  • Chemical

    Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.

    See More
  • Mining & Metal

    Mining operations produces valuable minerals or geological materials from the Earth. Economical recovery often requires high throughput and high availability of the process with low operation costs, and stringent safety and environmental regulations.

    See More
  • Oil & Gas

    Yokogawa has a wealth of experience in every part of the oil and gas business, from offshore and onshore facilities to pipelines, terminals, and deepwater operations. We provide solutions that enhance safety, ensure accurate and reliable operation, and increase plant efficiency.

    See More
  • Pulp & Paper

    The paper and pulp industry is highly competitive and must meet ever-changing market needs. Yokogawa helps realize energy-efficient plants which are globally sustainable.

    See More

Related Products & Solutions


    The ADMAG CA magnetic flow meter adopts a system to pick up the electromotive force generated in a fluid by electrodes provided outside a ceramic pipe through the capacitance of the pipe. In addition, the flowmeter employs a prominent high-frequency excitation method that reduces flow noise in low conductivity fluid.

    See More
  • Magnetic Flowmeter CA Series

    The CA Series promises stable measurement even for fluids that are considered difficult to measure, such as slurry fluids and adhesive fluids. The design based on the Total Insight concept improves operability and maintainability for customers.

    See More
  • Field Instruments

    A group of products that measure pressure, flow rate, temperature, and level, all of which are essential factors in plant operations. High-performance sensors ensure stable and high-precision performance under any circumstances.

    See More
  • Magnetic Flowmeters

    Yokogawa's experience with magnetic flowmeters spans decades. Our magnetic flow meters provide flexible configurations for industrial use in most areas.

    See More