Oil In Water Measurement and Liquid Control

The skid is stand-alone comprised of a control enclosure, a 3-way valve, and a measuring device used to detect the amount of oil in water. The function of the skid is to determine if a liquid flowing through the unit contains oil above or below a certain limit (which can be set according to requirements). Based on the amount of oil detected, the unit will discharge this liquid to one of two designated outlets.

Description

The skid is stand-alone comprised of a control enclosure, a 3-way valve, and a measuring device used to detect the amount of oil in water. The function of the skid is to determine if a liquid flowing through the unit contains oil above or below a certain limit (which can be set according to requirements). Based on the amount of oil detected, the unit will discharge this liquid to one of two designated outlets.

The unit can be connected to the permeate outlet of an existing RenaPure unit or could operate completely by itself. The oil concentration set point can be set according to current local discharge limitations. Simply hook it up to any stream of liquid, and the unit will determine if the liquid is discharge – safe in regards to oil content. Liquid not within acceptable tolerances is sent to the reject- outlet (often a storage tank), and liquid within acceptable tolerances is sent to clean water outlet (usually discharged to sea). The position of the valve controlling the discharge direction is monitored by the control system, which will trigger an alarm in the event of valve malfunction.

  • The skid measures just 1.33m x 0.83m x 0.61m (H x W x D).
  • Control cabinet with PLC, operator panel, and PPM readout screen.
  • The skid is certified for ATEX zone 1.
  • Only 230VAC and air connection required, very low consumption.
  • High accuracy, real time measurement of oil in water content.

The units measuring device is a high reliability, high precision, and compact probe style in-line measuring system. The probe uses a well-tested and robust measuring technique called laser induced fluorescence. Laser induced fluorescence means a laser is fired into the liquid stream, and the wavelength of the reflected light is measured and evaluated to accurately determine the current oil in water content. Traditional fluorescence- based analyzers measure on a single wavelength, but the measuring device of the unit can provide full spectral analysis, and such capability provides several necessary advantages:

  • Eliminate chemical interference that occurs in 99% of applications.
  • Oil type detection that offers the ability to switch calibration depending on water content, so when different oil types come onstream or different chemicals are introduced the analyzer will automatically select the correct calibration curve.
  • Verifies that the analyzer is reading accurately when commissioned and continues to do so despite process changes
  • New rapid wave ultrasonic self-cleaning, automatically keeps the sensor clean and does not affect process readings
  • MEPC 107(49) certified

A 230VAC, 50/60Hz, 10A power connection and 6-10 bar instrument air connection is all that is required for the skid to function, and it comes prepared for easy interfacing with 3rd party systems. The following signals are available for remote monitoring:

  • Common Fault potential free contact (Internal skid fault, valve failure, emergency stop activated, measuring device fault)
  • Discharge Active Status potential free contact (Liquid is within acceptable range and is discharged to permeate)
  • Current Oil in Water Content, 4-20mA active signal which could be used for logging or external monitoring (0-100 Parts Per Million)
  • Can be connected to by a standard CAT5/CAT6 cable to view the PPM read-out directly in a control room.

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