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Challenges in Flow Measurement of Chlorine

Chlorine is one of most important chemical used world wide in numerous industries . Apart from being widely used as disinfectant in water it is used in manufacturing of paper , paints , insecticides , textiles , PVC . It is mostly used in pharmaceutical industry either directly or its compound at some stage in manufacture.

The chloride ion is essential to life. It is mostly present in cell fluid as a negative ion to balance the positive (mainly potassium) ions. It is also present in extra-cellular fluid (eg blood) to balance the positive (mainly sodium) ions

Chlorine is also found in the minerals carnallite (magnesium potassium chloride) and sylvite (potassium chloride).

Chlorine gas are made each year from the electrolysis of brine (sodium chloride solution). This is most widely adopted process for production of chlorine called as Choloro Alkali process .

In this process, a salt solution sodium chloride is electrolysed by the action of direct electric current which converts chloride ions to elemental chlorine

Titanium an exotic and expensive metal is mostly suitable to withstand harsh effect chlorine corrosiveness.

One of the chlorine manufacturers using above process technique was facing flow measurement issues using mass flow meters adopting wetted measurement principles as these meters were showing drift in reading and subsequent failure due to high corrosiveness nature of Chlorine. Operational safety risk due to potential leakage was always there. Maintenance cost soared owing to these reasons.

Client then opted for clamp on ultrasonic flow meters which were ideal to solve this problem in more accurate , reliable , versatile and cost effective way .

With no direct media contact and being independent of the pipe dimensions and materials, they provided an accurate and reliable reading of the chorine flow rate. With new state of art technology where in these meters automatically do flow profile compensation fast signal processing and can calculate mass flow and concentration level even below 0 °C.

Apart from above technological benefits there were cost benefit in terms of reduction in maintenance cost and enhanced instrument life cycle .

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