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Water monitoring


Water analysis system highlights water


treatment improvements for power station An analysis system trial at a water treatment plant in Ireland has demonstrated its ability to reduce downtime. The trial generated reliable results for detecting trace-level impurities and chlorine with Bürkert’s 8905 analysis system and sensors. The results of the trial by an environmental monitoring services company have provided confidence in the repeated accuracy of the data, enabling investigation of wider plant automation.


ultra-purified water, is required to drive the plant’s turbines. Water fed from a semi- covered reservoir passes through a treatment plant featuring a reverse osmosis (RO) system and an electric deionization (EDI) process, which create the required ultra-purified water. Water conductivity from the process has to be accurately measured and reduced to approximately 15 µS and the RO system is tasked with the removal of impurities, which can deteriorate the EDI over time. Impurities penetrating the RO system can also cause stress corrosion cracking in the turbine blades. The environmental services company was


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required to report on the water treatment plant’s conductivity as well as levels of chlorine, pH, ORP and turbidity. The plant’s existing analysis equipment did not provide sufficient data, and measurement clarity as


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ürkert’s client was tasked to run a water analysis trial at a gas power plant in Ireland. Steam, generated from


well as repeatable accuracy were essential. Irregular power demand also meant periods of low flow, which impacted stability of measurement. Specialising in reliable online environmental monitoring, the company selected Bürkert to provide the sensors and water analysis capability as a result of the company’s expertise in rapid, accurate and reliable measurement. A full suite of Bürkert 8905 Online Analysis


System units for monitoring water parameters, combined with Type MS sensor cubes, each suited to monitor a specific characteristic, were installed into a compact panel. The trial monitored the feed into the RO system and while it was originally designed to run for three months, as a result of the Covid pandemic, the sensors were left in place for six months. The challenge of the reservoir’s low flow


was a result of its oversized construction. Designed for a maximum capacity of 50 tonnes of water per hour to support hours


of peak power generation, the plant can process as little as 20 tonnes per day when on standby. Typical analytical sensors on a one-inch process line require 2-3,000 litres per hour, whereas Bürkert’s 8905 system, even with five sensors, requires just 30 litres per hour. Even when a continuous pump is required to fulfil the sensors’ minimum flow requirement, the Bürkert system provides significant reduction in wastage and cost. Throughout the six-month period, the


system ran without deviation, not requiring recalibration or inspection, which demonstrated its reliability. This was a crucial requirement for the water monitoring company and also the power plant operator, giving confidence for uninterrupted service and low maintenance requirements. Crucially, the accuracy and sensitivity of the


8905 system showed chlorine trace not previously identified. Long term, trace levels of chlorine can degrade the RO membranes and ultimately allow the unwanted passage


April 2021 Instrumentation Monthly


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