April 2007

Process Developments

Temperature variation and its effects on pH

This important parameter is often overlooked in day-to-day operations

Ramakumar, K. R., Gujarat Refinery, Indian Oil Corporation Limited

The pH of service solution in any piece of equipment like a boiler or heat exchanger is an important parameter that should be maintained in a specified range. Equipment metallurgical properties must also be considered. Normally, pH measurements are made by online pH analyzers located downstream of coolers at a much lower temperature compared to actual operating condition. These readings are generally cross-checked by operating personnel with color indication from time to time. But the crux of this issue is whether measuring the pH at a temperature lower than actual operating condition fulfills the actual purpose of maintaining pH. Experimental data accentuates the fact that pH tends to be

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