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COVID-19


Measures were put in place to eliminate


the threat: an oxygen monitoring system were developed and implemented and a SCADA (supervisory control and data acquisition) system was utilised to monitor the real-time oxygen consumption of the various facilities. The system was designed not only to


measure consumption but also to act as a pre-warning system. The system was designed to roll up to a command centre whereby remote monitoring could be performed.


Background SCADA was the first time utilised at Mediclinic Hoogland in 2010 as an energy management tool. Mediclinic invested in the Circutor product range due to its flexibility, simple application and free upgrade options.


In the beginning, the primary objective


was to capture real-time energy consumption and analyse demand profiles. All development was done in-house by Mediclinic staff with support from Circutor. Over time, the instalment base of


SCADA increased and its application become more versatile. Currently, SCADA is utilised within Mediclinic Southern Africa for energy management, services and equipment monitoring and billing. The strategy is to keep the


development in-house with training to improve utilisation. Mediclinic has developed a ‘SCADA Academy’ to ensure standards are adhered to and to support the various hospitals with developments.


First wave It was essential to develop a system to monitor the real-time consumption of oxygen. Speed was essential and the


Current oxygen consumption (kg/hr) Available oxygen (kg)


Available oxygen at current consumption (days/hr) Liquid oxygen tank level (%)


Oxygen reticulation threshold (kg/hr)


Consumption status Usage for previous day


Vapour pressure in liquid oxygen tank (kPa) Line pressure from bulk tank (kPa) Pressure of oxygen – left bank (MPa) Pressure of oxygen – right bank (MPa) Line pressure supplied into hospital (kPa)


Status of water supply Status of electrical supply


Figure 2. Display at hospital level. IFHE DIGEST 2022


1500 1200 1061 900 601 600 338 300 0 June July August


September October November December Month


Figure 1. Anticipated oxygen demand versus supply during COVID first wave.


system needed to be installed at 40 different hospitals in a short period of time. Very few resources were available and


the existing infrastructure, systems, equipment and skills were utilised to achieve the objective. The requirements for the system were as follows: l Measure the available liquid oxygen in the tank.


l Calculate the oxygen consumption per hour.


l Display the information at the hospital, regional level and group level.


l Programme alarm values to trigger alarms.


l Send a text message to the relevant mobile phone as soon as an alarm condition is triggered.


All the liquid oxygen tanks were equipped with telemetry systems, thus it was not necessary to install additional field measuring devices.


Mediclinic Bloemfontein oxygen use 54


13272 9 D 88.4 123


1364 1012 1043 15.6 9.1


405


kg/hr kg


13 hr %


kg/hr kg


kPa kPa MPa MPa kPa


The challenge was that a variety of


telemetry systems we utilised by the two medical gas suppliers and the installation protocol was different for each hospital.


The project A small team of five members were tasked to execute the project. The team members are all in-house staff at the various facilities fulfilling different roles. The project consisted out of two major elements. l The existing hardware needed to be configured to communicate with the SCADA system in such a manner that the output could be converted into a useful variable.


l The second element was to perform the programming to get the desired dashboard.


Both these two elements were performed at the same time. The programming of the algorithmics to calculate hourly oxygen consumption with the information from the differential pressure gauge on the liquid oxygen tank took a lot of trial and error. There were enormous time constraints.


To ensure that the IT network was not flooded with data, it was decided to take readings at 15-minute intervals. This would provide the hospital sufficient time to respond if consumption exceeded the threshold value. At the same time, various onsite wiring


configurations were developed to ensure effective communication between the liquid oxygen tank telemetry system and SCADA. These diagrams needed to be easily


understandable for the technical resources at the hospital level to execute effectively. Various wiring configurations were developed to accommodate the various telemetry configurations (Fig 2). The end product allows the local


healthcare facility to view the status of their oxygen consumption on a local computer. Figure 3 is a typical example of information that is available to the hospital regarding oxygen consumption.


35 229 198


n Total oxygen demand n Current baseline medical oxygen supply n Increase production capacity n Redirect industrial supply to healthcare


1449 1201


Tonnes/day


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