In the offshore production facilities, the Oil in Water Analyzer plays an important rule to continuously analyze the oil content of the produced water from the separation process. In typical application, the Oil in Water Analyzer is placed in the outlet of produced water treatment package to see whether the treated water has been as per requirement or not. In typical application (in particular application it shall refer to applicable local regulation) the maximum oil in water content should not exceed 30 mg/L (or 30 ppm) per 24 hr average.
See below typical P&ID showing the Oil in Water Analyzer that control the flow of treated produced water. In this P&ID the Oil in Water Analyzer will continuously monitor the oil content of the water, if the oil content is higher than the requirement (30 mg/L or 30 ppm) then the on-off valve to overboard will close and the on-off valve to off-spec produced water tank will open and vice versa. The daily total oil in water content is also calculated by using an output from the flow transmitter.
In the input of the produced water treatment package, there is also oil in water analyzer put in 2oo3 configuration to monitor the produced water input. If the oil content of the produced water input it self is already higher than the produced water treatment package capacity, then the input to produced water treatment is closed and by passed to off-spec produced water tank.
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