COVID-19
Figure 3. Command centre dashboard.
The first seven indicators are an indication of the available liquid oxygen and the consumption rate. The hospital can now cross-reference the available oxygen to the next delivery date. The colour of the background indicates change if there is an alarm condition present.
In Figure 3, the first alarm condition is triggered when ‘Liquid Oxygen Tank - %’
is below 50 per cent. The second alarm will be triggered if the level drops below 30 per cent. The colour will change from orange to red. Green indicates that all conditions are safe. The next five indicators monitor the
various pressures of the system. This is essential if the actual consumption gets close to the threshold value. The last two indicators are a status
indication of the power supply and water supply to the hospital. Green indicates the conditions are good and red will indicate failure. The goal at the command centre level was to have one display with the status of all the various hospitals on display. Less information was displayed at the command centre.
During the second wave Hospitals can monitor oxygen consumption from a laptop or personal computer. An additional feature that was added to the system is the ability to get a graphic indication of the various indicators. Alarm conditions are triggered in
advance to notify the hospital if the oxygen consumption is close to the system threshold and when the liquid level in the tank drops below a critical point. Figure 4 is an example of a hospital that
Figure 4. Graph shows real example of hospital exceeding its allowable oxygen consumption during the COVID second wave.
exceeded its allowable consumption during the COVID second wave. The information was shared with the clinical team and the hospital was able to manage oxygen consumption during the second wave. Figure 5 shows a leak in one of the
valves of a liquid oxygen tank. The line on the graph should be smooth. With the SCADA system, it was possible to identify the problem and an investigation revealed a leak on one of the valves.
Conclusion The monitoring of oxygen with SCADA software has proven to be an essential risk management tool during high oxygen consumption. It is also used to evaluate the liquid oxygen tank performance and the behaviour of the oxygen reticulation during certain pressure and flow conditions. The utilisation of the differential
Figure 5. Graph shows a leak in one of the valves of a liquid oxygen task. 36
pressure gauge of the telemetry system can be problematic and a mass flow meter can resolve the issues.
IFHE DIGEST 2022 IFHE
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